- Published on
Colon Trauma
Description And Pathophysiology
Colon trauma refers to injury that perforates or compromises the integrity of the colon, leading to inflammation of the anatomic cavity in which it lies. Peritoneal inflammation from hollow viscus perforation often requires several hours to develop, which can delay diagnosis. Mesenteric tears from blunt trauma may result in hemorrhage and bowel ischemia, with delayed perforation occurring secondary to ischemic or necrotic bowel. Extravasation of intraluminal flora can progress to peritonitis and sepsis. The ascending and descending colon are retroperitoneal structures, and the left colon carries a higher bacterial load than the right. Morbidity and mortality rise significantly when diagnosis is delayed.
Etiology And Mechanisms Of Injury
Penetrating abdominal trauma is a common cause, with the colon being the second most frequently injured organ. Gunshot wounds carry the highest incidence, and the transverse colon is most often affected, frequently presenting with peritonitis. Blunt abdominal trauma less commonly injures the colon but may cause burst injuries from compression of a closed bowel loop. The intestine may be trapped between a lap belt and the vertebral column or pelvis, or injured during sudden deceleration, resulting in bowel–mesenteric disruption and devascularization. In these cases, the sigmoid and transverse colon are particularly vulnerable. Transanal injuries may occur from iatrogenic endoscopic procedures, barium enemas, sexual foreign bodies, or high-pressure compressed air. Swallowed sharp foreign bodies, such as toothpicks, may penetrate the colon, most often at the cecum, appendix, or sigmoid, although most ingested objects pass without complication. In children, blunt and penetrating colon injuries occur with similar frequency.
Clinical Presentation And Symptoms
Colon trauma is usually associated with other intra-abdominal or extra-abdominal injuries, particularly involving the small intestine. Early findings may be minimal even in severe injury, and it is uncommon to localize a specific organ injury on physical examination. Assessment should focus on signs of peritoneal irritation, abdominal wall ecchymosis or hematoma from lap-belt compression, epigastric bruising from steering-wheel impact, and flank ecchymosis such as Grey Turner sign indicating retroperitoneal bleeding. Digital rectal examination may reveal blood or foreign bodies but should be performed cautiously if sharp objects are suspected. Notably, bowel sounds are unreliable, and the absence of abdominal wall bruising does not exclude serious injury.
Initial Evaluation And Essential Workup
Serial abdominal examinations are critical because inflammatory changes take time to evolve. In hemodynamically stable patients, contrast-enhanced abdominal CT is the diagnostic study of choice. In potentially unstable patients, focused ultrasound and diagnostic peritoneal lavage may be useful adjuncts.
Diagnostic Testing And Imaging Interpretation
No single test reliably excludes blunt colonic injury. Signs of peritoneal irritation may not appear for several hours. Laboratory evaluation is nonspecific but may include electrolytes, calcium, and magnesium. CT imaging is more useful in penetrating than blunt injuries and provides visualization of intraperitoneal and retroperitoneal structures. Oral contrast is not essential in blunt trauma. Although CT sensitivity for hollow viscus injury is moderate, abnormal findings are common and include extraluminal gas or contrast, mesenteric fat stranding, and free fluid without solid organ injury. Water-soluble contrast enema with fluoroscopy may be helpful when other studies are inconclusive. Plain abdominal radiographs can reveal indirect signs such as free air. FAST ultrasound does not adequately assess enteric injury or retroperitoneal hemorrhage. Diagnostic peritoneal lavage may reveal fecal material or vegetable matter, which is diagnostic of hollow viscus injury, though white blood cell response may be delayed.
Differential Diagnosis
Other intra-abdominal injuries must be considered, and in children, pelvic fractures may mimic intraperitoneal pathology.
Prehospital Management Considerations
Standard trauma protocols with attention to airway, breathing, and circulation should be followed. Penetrating foreign bodies should not be removed in the field, and eviscerated bowel should be covered with moist saline dressings without attempts at replacement. Mechanism of injury, vehicle damage, and seat belt use should be documented. Intravenous crystalloid resuscitation remains standard practice.
Emergency Department Stabilization And Treatment
Primary survey and resuscitation take precedence over abdominal evaluation. Aggressive intravenous fluid and blood resuscitation should be initiated as needed. Early surgical consultation is essential, as operative management is definitive. Eviscerated bowel should be protected with moist saline gauze in a nondependent position. Broad-spectrum antibiotics covering gram-negative aerobic and anaerobic organisms should be administered, and tetanus prophylaxis ensured.
Disposition And Follow-Up
All confirmed or suspected colon injuries require hospital admission for surgical management or close monitoring. Penetrating foreign bodies must be removed to prevent sepsis. Patients with abdominal wall ecchymosis warrant admission due to the risk of occult hollow viscus injury. Discharge may be considered only for patients with completely normal examinations, stable hemodynamics, and no suspicion of intra-abdominal injury, provided strict return precautions are given.
Clinical Pearls And Pitfalls
Colon trauma may initially present with few symptoms. When the mechanism suggests significant blunt abdominal injury, observation with serial examinations is essential to avoid missed or delayed diagnosis.
Description And Pathophysiology
Colon trauma refers to injury that perforates or compromises the integrity of the colon, leading to inflammation of the anatomic cavity in which it lies. Peritoneal inflammation from hollow viscus perforation often requires several hours to develop, which can delay diagnosis. Mesenteric tears from blunt trauma may result in hemorrhage and bowel ischemia, with delayed perforation occurring secondary to ischemic or necrotic bowel. Extravasation of intraluminal flora can progress to peritonitis and sepsis. The ascending and descending colon are retroperitoneal structures, and the left colon carries a higher bacterial load than the right. Morbidity and mortality rise significantly when diagnosis is delayed.
Etiology And Mechanisms Of Injury
Penetrating abdominal trauma is a common cause, with the colon being the second most frequently injured organ. Gunshot wounds carry the highest incidence, and the transverse colon is most often affected, frequently presenting with peritonitis. Blunt abdominal trauma less commonly injures the colon but may cause burst injuries from compression of a closed bowel loop. The intestine may be trapped between a lap belt and the vertebral column or pelvis, or injured during sudden deceleration, resulting in bowel–mesenteric disruption and devascularization. In these cases, the sigmoid and transverse colon are particularly vulnerable. Transanal injuries may occur from iatrogenic endoscopic procedures, barium enemas, sexual foreign bodies, or high-pressure compressed air. Swallowed sharp foreign bodies, such as toothpicks, may penetrate the colon, most often at the cecum, appendix, or sigmoid, although most ingested objects pass without complication. In children, blunt and penetrating colon injuries occur with similar frequency.
Clinical Presentation And Symptoms
Colon trauma is usually associated with other intra-abdominal or extra-abdominal injuries, particularly involving the small intestine. Early findings may be minimal even in severe injury, and it is uncommon to localize a specific organ injury on physical examination. Assessment should focus on signs of peritoneal irritation, abdominal wall ecchymosis or hematoma from lap-belt compression, epigastric bruising from steering-wheel impact, and flank ecchymosis such as Grey Turner sign indicating retroperitoneal bleeding. Digital rectal examination may reveal blood or foreign bodies but should be performed cautiously if sharp objects are suspected. Notably, bowel sounds are unreliable, and the absence of abdominal wall bruising does not exclude serious injury.
Initial Evaluation And Essential Workup
Serial abdominal examinations are critical because inflammatory changes take time to evolve. In hemodynamically stable patients, contrast-enhanced abdominal CT is the diagnostic study of choice. In potentially unstable patients, focused ultrasound and diagnostic peritoneal lavage may be useful adjuncts.
Diagnostic Testing And Imaging Interpretation
No single test reliably excludes blunt colonic injury. Signs of peritoneal irritation may not appear for several hours. Laboratory evaluation is nonspecific but may include electrolytes, calcium, and magnesium. CT imaging is more useful in penetrating than blunt injuries and provides visualization of intraperitoneal and retroperitoneal structures. Oral contrast is not essential in blunt trauma. Although CT sensitivity for hollow viscus injury is moderate, abnormal findings are common and include extraluminal gas or contrast, mesenteric fat stranding, and free fluid without solid organ injury. Water-soluble contrast enema with fluoroscopy may be helpful when other studies are inconclusive. Plain abdominal radiographs can reveal indirect signs such as free air. FAST ultrasound does not adequately assess enteric injury or retroperitoneal hemorrhage. Diagnostic peritoneal lavage may reveal fecal material or vegetable matter, which is diagnostic of hollow viscus injury, though white blood cell response may be delayed.
Differential Diagnosis
Other intra-abdominal injuries must be considered, and in children, pelvic fractures may mimic intraperitoneal pathology.
Prehospital Management Considerations
Standard trauma protocols with attention to airway, breathing, and circulation should be followed. Penetrating foreign bodies should not be removed in the field, and eviscerated bowel should be covered with moist saline dressings without attempts at replacement. Mechanism of injury, vehicle damage, and seat belt use should be documented. Intravenous crystalloid resuscitation remains standard practice.
Emergency Department Stabilization And Treatment
Primary survey and resuscitation take precedence over abdominal evaluation. Aggressive intravenous fluid and blood resuscitation should be initiated as needed. Early surgical consultation is essential, as operative management is definitive. Eviscerated bowel should be protected with moist saline gauze in a nondependent position. Broad-spectrum antibiotics covering gram-negative aerobic and anaerobic organisms should be administered, and tetanus prophylaxis ensured.
Disposition And Follow-Up
All confirmed or suspected colon injuries require hospital admission for surgical management or close monitoring. Penetrating foreign bodies must be removed to prevent sepsis. Patients with abdominal wall ecchymosis warrant admission due to the risk of occult hollow viscus injury. Discharge may be considered only for patients with completely normal examinations, stable hemodynamics, and no suspicion of intra-abdominal injury, provided strict return precautions are given.
Clinical Pearls And Pitfalls
Colon trauma may initially present with few symptoms. When the mechanism suggests significant blunt abdominal injury, observation with serial examinations is essential to avoid missed or delayed diagnosis.
- Published on
Emergency and Acute Medicine -Coma
Description And Definitions
Coma represents a state of unresponsiveness characterized by loss of arousal, cognition, or both. Light coma is defined by response to noxious stimuli, whereas deep coma involves no response to pain. Unresponsiveness may result from loss of arousal, a function primarily of the brainstem reticular activating system, or loss of cognition, which requires bilateral cerebral hemispheric dysfunction. Related states include stupor, marked by deep sleep with minimal responsiveness; obtundation, involving mental blunting with reduced alertness; delirium, characterized by fluctuating agitation, hallucinations, and disorientation; and clouding of consciousness, reflecting impaired awareness and perception of stimuli.
Etiology And Pathophysiology
Diffuse brain dysfunction accounts for the majority of coma cases and includes hypoglycemia, hypoxia, toxic exposures, infections, endocrine disorders, metabolic derangements, electrolyte abnormalities, temperature dysregulation, postictal states, hypertensive encephalopathy, and shock. Toxic causes include alcohols, sedative-hypnotics, narcotics, anticonvulsants, heavy metals, anticholinergics, lithium, cyanide, and carbon monoxide. Structural causes are divided into supratentorial lesions such as intracranial hemorrhage, infarction, tumors, abscesses, and hydrocephalus, and subtentorial lesions including brainstem infarction, hemorrhage, tumors, and demyelination. Pregnancy-related causes include eclampsia.
Clinical Presentation And Examination
Patients present with an ongoing disturbance of consciousness, absence of spontaneous eye opening, lack of response to pain, and minimal or absent motor activity, often with preserved cardiorespiratory function. The Glasgow Coma Scale is used to quantify severity based on eye opening, motor response, and verbal response. Vital sign abnormalities may suggest etiology, such as fever with infection, hypothermia with metabolic or toxic causes, hypertension with structural lesions, or hypotension with shock. Pupillary findings, abnormal posturing, asymmetric movements, nuchal rigidity, or signs of trauma provide critical diagnostic clues.
Essential Evaluation Principles
The immediate priority is identification and treatment of reversible causes. Coma-mimicking conditions such as psychogenic unresponsiveness or locked-in syndrome must be excluded. Before neuromuscular paralysis for intubation, clinicians should assess for voluntary eye movements or blinking to identify locked-in syndrome. Airway protection remains mandatory when aspiration risk is present.
Diagnostic Testing And Interpretation
Initial laboratory studies include bedside glucose, complete blood count, electrolytes, and blood and urine toxicology screens. Noncontrast head CT is essential to evaluate for hemorrhage, mass effect, or midline shift, with CT angiography when cerebrovascular accident is suspected. Lumbar puncture is indicated in coma of unknown origin, particularly with fever, after neuroimaging excludes elevated intracranial pressure or mass lesions. Electroencephalography may help identify nonconvulsive status epilepticus but has limited emergent utility.
Differential Diagnosis
Key considerations include locked-in syndrome, psychogenic unresponsiveness, stupor, catatonia, and akinetic mutism.
Prehospital Management
Initial management focuses on airway protection, oxygenation, intravenous access, glucose assessment and correction, naloxone administration when indicated, and continuous monitoring. Rapid neurologic assessment includes Glasgow Coma Scale scoring, pupillary evaluation, and extremity movement.
Emergency Department Stabilization And Treatment
Airway management is paramount. Empiric dextrose and naloxone are appropriate when bedside glucose is unavailable or opioid exposure is suspected. Thiamine should be administered in patients at risk for deficiency. Broad-spectrum antibiotics with cerebrospinal fluid penetration are considered when infection is suspected. Seizure activity requires prompt treatment with benzodiazepines and antiepileptics. Temperature abnormalities must be corrected aggressively, using rewarming for hypothermia and cooling for hyperthermia. Activated charcoal may be used for select toxic ingestions.
Disposition And Follow-Up
Patients without a clearly identified and fully reversible cause of coma require hospital admission, often to an intensive care unit. Discharge may be considered only for patients with completely reversed hypoglycemia or opioid toxicity after adequate observation. Those discharged require urgent outpatient follow-up and supervision for at least 24 hours.
Clinical Pearls And Pitfalls
Rapid stabilization and early neuroimaging are essential. Metabolic and toxicologic causes must always be considered. Structural lesions may coexist with metabolic abnormalities. Patients eligible for discharge require prolonged observation to ensure sustained neurologic recovery.
Description And Definitions
Coma represents a state of unresponsiveness characterized by loss of arousal, cognition, or both. Light coma is defined by response to noxious stimuli, whereas deep coma involves no response to pain. Unresponsiveness may result from loss of arousal, a function primarily of the brainstem reticular activating system, or loss of cognition, which requires bilateral cerebral hemispheric dysfunction. Related states include stupor, marked by deep sleep with minimal responsiveness; obtundation, involving mental blunting with reduced alertness; delirium, characterized by fluctuating agitation, hallucinations, and disorientation; and clouding of consciousness, reflecting impaired awareness and perception of stimuli.
Etiology And Pathophysiology
Diffuse brain dysfunction accounts for the majority of coma cases and includes hypoglycemia, hypoxia, toxic exposures, infections, endocrine disorders, metabolic derangements, electrolyte abnormalities, temperature dysregulation, postictal states, hypertensive encephalopathy, and shock. Toxic causes include alcohols, sedative-hypnotics, narcotics, anticonvulsants, heavy metals, anticholinergics, lithium, cyanide, and carbon monoxide. Structural causes are divided into supratentorial lesions such as intracranial hemorrhage, infarction, tumors, abscesses, and hydrocephalus, and subtentorial lesions including brainstem infarction, hemorrhage, tumors, and demyelination. Pregnancy-related causes include eclampsia.
Clinical Presentation And Examination
Patients present with an ongoing disturbance of consciousness, absence of spontaneous eye opening, lack of response to pain, and minimal or absent motor activity, often with preserved cardiorespiratory function. The Glasgow Coma Scale is used to quantify severity based on eye opening, motor response, and verbal response. Vital sign abnormalities may suggest etiology, such as fever with infection, hypothermia with metabolic or toxic causes, hypertension with structural lesions, or hypotension with shock. Pupillary findings, abnormal posturing, asymmetric movements, nuchal rigidity, or signs of trauma provide critical diagnostic clues.
Essential Evaluation Principles
The immediate priority is identification and treatment of reversible causes. Coma-mimicking conditions such as psychogenic unresponsiveness or locked-in syndrome must be excluded. Before neuromuscular paralysis for intubation, clinicians should assess for voluntary eye movements or blinking to identify locked-in syndrome. Airway protection remains mandatory when aspiration risk is present.
Diagnostic Testing And Interpretation
Initial laboratory studies include bedside glucose, complete blood count, electrolytes, and blood and urine toxicology screens. Noncontrast head CT is essential to evaluate for hemorrhage, mass effect, or midline shift, with CT angiography when cerebrovascular accident is suspected. Lumbar puncture is indicated in coma of unknown origin, particularly with fever, after neuroimaging excludes elevated intracranial pressure or mass lesions. Electroencephalography may help identify nonconvulsive status epilepticus but has limited emergent utility.
Differential Diagnosis
Key considerations include locked-in syndrome, psychogenic unresponsiveness, stupor, catatonia, and akinetic mutism.
Prehospital Management
Initial management focuses on airway protection, oxygenation, intravenous access, glucose assessment and correction, naloxone administration when indicated, and continuous monitoring. Rapid neurologic assessment includes Glasgow Coma Scale scoring, pupillary evaluation, and extremity movement.
Emergency Department Stabilization And Treatment
Airway management is paramount. Empiric dextrose and naloxone are appropriate when bedside glucose is unavailable or opioid exposure is suspected. Thiamine should be administered in patients at risk for deficiency. Broad-spectrum antibiotics with cerebrospinal fluid penetration are considered when infection is suspected. Seizure activity requires prompt treatment with benzodiazepines and antiepileptics. Temperature abnormalities must be corrected aggressively, using rewarming for hypothermia and cooling for hyperthermia. Activated charcoal may be used for select toxic ingestions.
Disposition And Follow-Up
Patients without a clearly identified and fully reversible cause of coma require hospital admission, often to an intensive care unit. Discharge may be considered only for patients with completely reversed hypoglycemia or opioid toxicity after adequate observation. Those discharged require urgent outpatient follow-up and supervision for at least 24 hours.
Clinical Pearls And Pitfalls
Rapid stabilization and early neuroimaging are essential. Metabolic and toxicologic causes must always be considered. Structural lesions may coexist with metabolic abnormalities. Patients eligible for discharge require prolonged observation to ensure sustained neurologic recovery.
- Published on
Emergency And Acute Medicine – Compartment Syndrome
Description
Compartment syndrome is a condition caused by elevated tissue pressure within a closed fascial space, leading to compromised capillary blood flow and subsequent ischemia. Normal tissue pressure is less than 10 mm Hg. Capillary perfusion becomes impaired at pressures greater than 20 mm Hg, and irreversible ischemic necrosis of muscle and nerve tissue may occur at pressures exceeding 30 mm Hg. When distal pulses are diminished on examination, significant muscle necrosis is usually already present. Although the four compartments of the lower leg are most commonly affected, compartment syndrome may also occur in the arm, forearm, hand, foot, thigh, buttocks, or shoulder.
Etiology
Compartment pressure may rise due to either a decrease in compartment size or an increase in compartment contents. Reduced compartment size occurs with circumferential casts, burn eschar, or use of military antishock trousers. Increased compartment contents result from edema or hematoma related to fractures, blunt trauma, overexertion, contrast extravasation, injection of recreational drugs, reperfusion after ischemia, or prolonged limb compression during immobilization.
Clinical Alert
The affected extremity should be maintained at the level of the heart to optimize arterial inflow without impairing venous return. Ice should not be applied when compartment syndrome is suspected, as it may further compromise microcirculation.
Clinical Presentation
Patients typically report severe, constant pain over the involved compartment that is out of proportion to the apparent injury. Pain worsens with active muscle contraction and passive stretching. Additional findings include muscle weakness and sensory changes such as hypesthesia. The classic “six Ps” include pain, pressure, paresis, paresthesia, pallor, and pulses present until late in the disease process.
Physical Examination
Examination reveals tense, tender muscle compartments. Motor strength and neurologic function should be carefully assessed and documented. Pulses may remain intact early and should not be used to exclude the diagnosis.
Diagnostic Evaluation
Plain radiographs should be obtained when fracture is suspected. Definitive diagnosis is made by measuring intracompartmental pressures, commonly using a compartment pressure monitoring system with an 18-gauge needle or continuous pressure monitoring catheter. After sterile preparation, the needle is advanced until the fascia is penetrated, followed by injection of a small saline volume to clear the lumen. Pressure readings should transiently rise with muscle compression or passive stretch and return to baseline when the maneuver is stopped, confirming correct placement.
Differential Diagnosis
Conditions that may mimic compartment syndrome include chronic exertional compartment syndrome, fascial hernia, stress fracture, arterial occlusion, neurapraxia, deep venous thrombosis, cellulitis, osteomyelitis, tenosynovitis, and synovitis.
Initial Stabilization
Any constrictive dressings or casts should be immediately loosened, univalved, and spread, with cast padding cut down to the skin. The limb should remain at heart level while awaiting definitive management.
Emergency Department Management
Acute compartment syndrome is a surgical emergency. Fasciotomy is the definitive treatment and is strongly indicated for compartment pressures exceeding 30–40 mm Hg. Early orthopedic or surgical consultation is essential.
Medications
Pharmacologic therapy does not treat the underlying pathology. Steroids and vasodilators are ineffective. Intravenous opioid analgesics may provide limited pain relief but are often insufficient, as definitive pain control usually requires surgical decompression. Oral analgesics and nonsteroidal anti-inflammatory drugs offer little acute benefit.
Disposition And Follow-Up
Patients with compartment pressures greater than 30 mm Hg require emergent surgical consultation and admission. Those with pressures between 20 and 30 mm Hg should be admitted for observation and surgical evaluation. Pressures between 15 and 20 mm Hg warrant serial measurements, and admission is recommended if reliable follow-up cannot be ensured. Patients with pressures below 10–15 mm Hg may be discharged with strict return precautions for worsening pain, swelling, or neurologic symptoms.
Referral Considerations
Suspected chronic compartment syndrome requires prompt orthopedic referral, ideally with direct communication to convey clinical concern.
Clinical Pearls And Pitfalls
Compartment pressures must be measured promptly or the patient transferred to a facility with this capability. Careful technique is required to avoid iatrogenic injury during pressure measurement. Concomitant rhabdomyolysis should always be considered in crush or prolonged compression injuries.
Description
Compartment syndrome is a condition caused by elevated tissue pressure within a closed fascial space, leading to compromised capillary blood flow and subsequent ischemia. Normal tissue pressure is less than 10 mm Hg. Capillary perfusion becomes impaired at pressures greater than 20 mm Hg, and irreversible ischemic necrosis of muscle and nerve tissue may occur at pressures exceeding 30 mm Hg. When distal pulses are diminished on examination, significant muscle necrosis is usually already present. Although the four compartments of the lower leg are most commonly affected, compartment syndrome may also occur in the arm, forearm, hand, foot, thigh, buttocks, or shoulder.
Etiology
Compartment pressure may rise due to either a decrease in compartment size or an increase in compartment contents. Reduced compartment size occurs with circumferential casts, burn eschar, or use of military antishock trousers. Increased compartment contents result from edema or hematoma related to fractures, blunt trauma, overexertion, contrast extravasation, injection of recreational drugs, reperfusion after ischemia, or prolonged limb compression during immobilization.
Clinical Alert
The affected extremity should be maintained at the level of the heart to optimize arterial inflow without impairing venous return. Ice should not be applied when compartment syndrome is suspected, as it may further compromise microcirculation.
Clinical Presentation
Patients typically report severe, constant pain over the involved compartment that is out of proportion to the apparent injury. Pain worsens with active muscle contraction and passive stretching. Additional findings include muscle weakness and sensory changes such as hypesthesia. The classic “six Ps” include pain, pressure, paresis, paresthesia, pallor, and pulses present until late in the disease process.
Physical Examination
Examination reveals tense, tender muscle compartments. Motor strength and neurologic function should be carefully assessed and documented. Pulses may remain intact early and should not be used to exclude the diagnosis.
Diagnostic Evaluation
Plain radiographs should be obtained when fracture is suspected. Definitive diagnosis is made by measuring intracompartmental pressures, commonly using a compartment pressure monitoring system with an 18-gauge needle or continuous pressure monitoring catheter. After sterile preparation, the needle is advanced until the fascia is penetrated, followed by injection of a small saline volume to clear the lumen. Pressure readings should transiently rise with muscle compression or passive stretch and return to baseline when the maneuver is stopped, confirming correct placement.
Differential Diagnosis
Conditions that may mimic compartment syndrome include chronic exertional compartment syndrome, fascial hernia, stress fracture, arterial occlusion, neurapraxia, deep venous thrombosis, cellulitis, osteomyelitis, tenosynovitis, and synovitis.
Initial Stabilization
Any constrictive dressings or casts should be immediately loosened, univalved, and spread, with cast padding cut down to the skin. The limb should remain at heart level while awaiting definitive management.
Emergency Department Management
Acute compartment syndrome is a surgical emergency. Fasciotomy is the definitive treatment and is strongly indicated for compartment pressures exceeding 30–40 mm Hg. Early orthopedic or surgical consultation is essential.
Medications
Pharmacologic therapy does not treat the underlying pathology. Steroids and vasodilators are ineffective. Intravenous opioid analgesics may provide limited pain relief but are often insufficient, as definitive pain control usually requires surgical decompression. Oral analgesics and nonsteroidal anti-inflammatory drugs offer little acute benefit.
Disposition And Follow-Up
Patients with compartment pressures greater than 30 mm Hg require emergent surgical consultation and admission. Those with pressures between 20 and 30 mm Hg should be admitted for observation and surgical evaluation. Pressures between 15 and 20 mm Hg warrant serial measurements, and admission is recommended if reliable follow-up cannot be ensured. Patients with pressures below 10–15 mm Hg may be discharged with strict return precautions for worsening pain, swelling, or neurologic symptoms.
Referral Considerations
Suspected chronic compartment syndrome requires prompt orthopedic referral, ideally with direct communication to convey clinical concern.
Clinical Pearls And Pitfalls
Compartment pressures must be measured promptly or the patient transferred to a facility with this capability. Careful technique is required to avoid iatrogenic injury during pressure measurement. Concomitant rhabdomyolysis should always be considered in crush or prolonged compression injuries.
- Published on
Emergency And Acute Medicine – Coagulopathy Reversal (Nonwarfarin Agents)
Description And Scope
Coagulopathy reversal in nonwarfarin agents applies to patients receiving anticoagulant or antiplatelet medications who present with minor, major, or clinically significant bleeding that requires close monitoring with or without active reversal. These medications include indirect thrombin inhibitors such as unfractionated heparin and low–molecular-weight heparins, antiplatelet agents such as aspirin and clopidogrel, factor Xa inhibitors, direct thrombin inhibitors, and hirudin derivatives. The decision to reverse therapy depends on bleeding severity, location, and patient risk factors.
Epidemiology And Risk Considerations
Bleeding complications are common with indirect thrombin inhibitors, affecting up to one third of patients, although major bleeding occurs in a smaller percentage. Aspirin exposure is widespread, with hundreds of over-the-counter products containing it, and data on hematoma expansion and mortality remain conflicting. For factor Xa inhibitors and direct thrombin inhibitors, true incidence rates of bleeding are still evolving. Pediatric patients most commonly receive heparin or low–molecular-weight heparin, while use of direct thrombin inhibitors in children remains under investigation. In older adults, renal clearance is a major concern, particularly with factor Xa inhibitors, dabigatran, and hirudin derivatives, necessitating careful dosing and monitoring.
Pathophysiology And Mechanisms
Indirect thrombin inhibitors exert their effect by binding antithrombin III, leading to inhibition of factor Xa and thrombin, although low–molecular-weight heparins have reduced thrombin inhibition. Antiplatelet agents irreversibly inhibit cyclooxygenase-1, suppressing thromboxane A2 production and platelet aggregation for the lifespan of the platelet. Factor Xa inhibitors act by selectively inhibiting factor Xa without directly affecting thrombin. Direct thrombin inhibitors block the active site of thrombin, with dabigatran having a significantly longer half-life compared with other agents.
Clinical Presentation And Indications For Reversal
Patients typically present with active bleeding while on anticoagulant therapy. Reversal is indicated in cases of serious or life-threatening hemorrhage, including traumatic bleeding, gastrointestinal hemorrhage, intracerebral hemorrhage, or when urgent procedures are required. A careful history should identify the specific anticoagulant, timing of the last dose, duration of therapy, recent trauma, and bleeding symptoms. Physical examination should focus on hemodynamic stability, neurologic status, and identification of bleeding sources.
Diagnostic Evaluation
Initial workup includes complete blood count, prothrombin time with INR, partial thromboplastin time, stool guaiac testing, and additional coagulation studies when indicated. Anti–factor Xa levels may be useful for heparins and factor Xa inhibitors, while dilute thrombin time may help assess dabigatran effect where available. Standard coagulation tests may be minimally helpful for some newer agents, requiring clinical correlation.
Initial And Emergency Management
Prehospital and early emergency department care focuses on hemorrhage control with direct pressure when possible, establishment of large-bore intravenous access, fluid resuscitation, and immediate cessation of anticoagulant therapy. Stabilization follows standard resuscitation principles while preparing for targeted reversal.
Agent-Specific Reversal Strategies
For indirect thrombin inhibitors, minor bleeding may be managed with observation, whereas major bleeding warrants protamine administration. Protamine dosing depends on the type of heparin, dose administered, and time elapsed since the last dose, with careful monitoring for adverse reactions such as hypotension or anaphylaxis. Low–molecular-weight heparin reversal is incomplete and compound specific.
Antiplatelet-associated bleeding is usually managed conservatively when minor, but severe bleeding may require desmopressin to enhance platelet function and, in selected cases, platelet transfusion.
For factor Xa inhibitors, supportive care is appropriate for minor bleeding. Major hemorrhage may require prothrombin complex concentrates or recombinant activated factor VII, recognizing limited evidence and thrombotic risk. Activated charcoal may be considered for recent ingestion, and hemodialysis has limited benefit except for certain agents such as fondaparinux.
Direct thrombin inhibitor–related bleeding is often managed conservatively due to short half-lives, except for dabigatran. Severe cases may require prothrombin complex concentrates, recombinant activated factor VII, desmopressin, or early hemodialysis, particularly in renal impairment.
Disposition And Follow-Up
Admission is indicated for clinically significant bleeding or when reversal agents are used. Patients with minor, controlled bleeding who do not require reversal may be discharged with close outpatient follow-up and coordination with primary care or hematology. Availability of blood bank resources and procedural services should be considered early in management.
Clinical Pearls And Pitfalls
Prophylactic heparin dosing rarely causes major bleeding. Low–molecular-weight heparin reversal with protamine is incomplete and time dependent. Single-dose aspirin has prolonged platelet effects lasting up to one week. Renal dysfunction significantly increases bleeding risk with several newer anticoagulants. Use of fresh frozen plasma as first-line therapy must be weighed against the risk of volume overload and limited efficacy for certain agents.
Description And Scope
Coagulopathy reversal in nonwarfarin agents applies to patients receiving anticoagulant or antiplatelet medications who present with minor, major, or clinically significant bleeding that requires close monitoring with or without active reversal. These medications include indirect thrombin inhibitors such as unfractionated heparin and low–molecular-weight heparins, antiplatelet agents such as aspirin and clopidogrel, factor Xa inhibitors, direct thrombin inhibitors, and hirudin derivatives. The decision to reverse therapy depends on bleeding severity, location, and patient risk factors.
Epidemiology And Risk Considerations
Bleeding complications are common with indirect thrombin inhibitors, affecting up to one third of patients, although major bleeding occurs in a smaller percentage. Aspirin exposure is widespread, with hundreds of over-the-counter products containing it, and data on hematoma expansion and mortality remain conflicting. For factor Xa inhibitors and direct thrombin inhibitors, true incidence rates of bleeding are still evolving. Pediatric patients most commonly receive heparin or low–molecular-weight heparin, while use of direct thrombin inhibitors in children remains under investigation. In older adults, renal clearance is a major concern, particularly with factor Xa inhibitors, dabigatran, and hirudin derivatives, necessitating careful dosing and monitoring.
Pathophysiology And Mechanisms
Indirect thrombin inhibitors exert their effect by binding antithrombin III, leading to inhibition of factor Xa and thrombin, although low–molecular-weight heparins have reduced thrombin inhibition. Antiplatelet agents irreversibly inhibit cyclooxygenase-1, suppressing thromboxane A2 production and platelet aggregation for the lifespan of the platelet. Factor Xa inhibitors act by selectively inhibiting factor Xa without directly affecting thrombin. Direct thrombin inhibitors block the active site of thrombin, with dabigatran having a significantly longer half-life compared with other agents.
Clinical Presentation And Indications For Reversal
Patients typically present with active bleeding while on anticoagulant therapy. Reversal is indicated in cases of serious or life-threatening hemorrhage, including traumatic bleeding, gastrointestinal hemorrhage, intracerebral hemorrhage, or when urgent procedures are required. A careful history should identify the specific anticoagulant, timing of the last dose, duration of therapy, recent trauma, and bleeding symptoms. Physical examination should focus on hemodynamic stability, neurologic status, and identification of bleeding sources.
Diagnostic Evaluation
Initial workup includes complete blood count, prothrombin time with INR, partial thromboplastin time, stool guaiac testing, and additional coagulation studies when indicated. Anti–factor Xa levels may be useful for heparins and factor Xa inhibitors, while dilute thrombin time may help assess dabigatran effect where available. Standard coagulation tests may be minimally helpful for some newer agents, requiring clinical correlation.
Initial And Emergency Management
Prehospital and early emergency department care focuses on hemorrhage control with direct pressure when possible, establishment of large-bore intravenous access, fluid resuscitation, and immediate cessation of anticoagulant therapy. Stabilization follows standard resuscitation principles while preparing for targeted reversal.
Agent-Specific Reversal Strategies
For indirect thrombin inhibitors, minor bleeding may be managed with observation, whereas major bleeding warrants protamine administration. Protamine dosing depends on the type of heparin, dose administered, and time elapsed since the last dose, with careful monitoring for adverse reactions such as hypotension or anaphylaxis. Low–molecular-weight heparin reversal is incomplete and compound specific.
Antiplatelet-associated bleeding is usually managed conservatively when minor, but severe bleeding may require desmopressin to enhance platelet function and, in selected cases, platelet transfusion.
For factor Xa inhibitors, supportive care is appropriate for minor bleeding. Major hemorrhage may require prothrombin complex concentrates or recombinant activated factor VII, recognizing limited evidence and thrombotic risk. Activated charcoal may be considered for recent ingestion, and hemodialysis has limited benefit except for certain agents such as fondaparinux.
Direct thrombin inhibitor–related bleeding is often managed conservatively due to short half-lives, except for dabigatran. Severe cases may require prothrombin complex concentrates, recombinant activated factor VII, desmopressin, or early hemodialysis, particularly in renal impairment.
Disposition And Follow-Up
Admission is indicated for clinically significant bleeding or when reversal agents are used. Patients with minor, controlled bleeding who do not require reversal may be discharged with close outpatient follow-up and coordination with primary care or hematology. Availability of blood bank resources and procedural services should be considered early in management.
Clinical Pearls And Pitfalls
Prophylactic heparin dosing rarely causes major bleeding. Low–molecular-weight heparin reversal with protamine is incomplete and time dependent. Single-dose aspirin has prolonged platelet effects lasting up to one week. Renal dysfunction significantly increases bleeding risk with several newer anticoagulants. Use of fresh frozen plasma as first-line therapy must be weighed against the risk of volume overload and limited efficacy for certain agents.
- Published on
Emergency And Acute Medicine – Cyanide Poisoning
Overview
Cyanide toxicity occurs through inhalation or gastrointestinal absorption. Cyanide is an intracellular toxin that disrupts aerobic metabolism by inhibiting oxidative phosphorylation, resulting in impaired oxygen utilization and reduced ATP production. Detoxification primarily occurs via the hepatic mitochondrial enzyme rhodanese, which combines cyanide with sulfur in an irreversible reaction to form the less toxic, water-soluble thiocyanate. Cyanide can also bind hemoglobin to form reversible cyanhemoglobin or bind hydroxocobalamin to form nontoxic cyanocobalamin. Effective detoxification depends on adequate sulfur availability, particularly thiosulfate.
Causes And Sources
Cyanide exposure most commonly occurs during fires as a combustion by-product of natural and synthetic materials. Industrial sources include metal plating, microchip and plastic manufacturing, chemical synthesis, pesticides, and solvents such as artificial nail remover and metal polishes. Cyanide may also be produced during nitroprusside metabolism and by certain bacterial infections. Dietary sources include amygdalin-containing plants such as apricot pits, peach pits, apple seeds, pear seeds, and cassava. Jewelry making is another recognized exposure risk.
Clinical Features
The heart and brain are the most sensitive organs and are typically affected first. Neurologic manifestations include headache, confusion, syncope, seizures, and coma. Cardiovascular findings include dyspnea, chest pain, rapid progression to cardiorespiratory collapse, and death. Gastrointestinal symptoms such as nausea and vomiting may occur. Oral exposure can be caustic, with as little as 50 mg causing death. Inhalational exposure to 50 ppm may cause anxiety, palpitations, dyspnea, and headache, while concentrations of 100–135 ppm can be lethal in less than one hour.
Initial Evaluation
A history suggestive of smoke inhalation, industrial exposure, or intentional ingestion should raise suspicion. Classic findings such as the odor of bitter almonds or bright red retinal vessels are often absent. Key clinical clues include abrupt onset or rapid deterioration, severe lactic acidosis, and elevated venous oxygen saturation due to impaired cellular oxygen utilization, resulting in arterialized venous blood gases.
Diagnostic Studies
Laboratory evaluation typically includes complete blood count, metabolic panel, liver profile, creatine phosphokinase, carboxyhemoglobin, and methemoglobin levels. Cyanide levels are usually send-out tests and not available in real time; levels above 0.5–1 mg/L are toxic, and levels of 2.5–3 mg/L are often fatal. Blood gas analysis may show elevated mixed venous oxygen saturation, reduced arteriovenous oxygen difference, and markedly elevated lactate levels greater than 8 mmol/L, which serve as a useful surrogate marker when exposure history is consistent. Chest radiography may assist in evaluating concurrent inhalation injury.
Conditions To Differentiate
The differential diagnosis includes carbon monoxide poisoning, hydrogen sulfide exposure, methemoglobinemia, sulfhemoglobinemia, inert gas asphyxiation, and other causes of high anion gap metabolic acidosis.
Prehospital Management
Immediate removal from the source of exposure is critical, while preventing secondary contamination of rescuers. Contaminated clothing should be removed and bagged, and liquid exposures require thorough washing with soap and water. Vapor exposures may resolve with simple removal from the environment.
Emergency Stabilization
Initial management follows standard airway, breathing, and circulation principles. Administer 100% oxygen regardless of measured oxygen tension, as it acts synergistically with antidotes. Gastric lavage and activated charcoal may be considered for recent oral ingestion if no contraindications exist. Dermal exposures require standard decontamination measures.
Definitive Treatment
Hydroxocobalamin is the preferred first-line antidote for patients with significant toxicity, including persistent high anion gap metabolic acidosis, hyperlactatemia, seizures, syncope, dysrhythmias, or hypotension. It binds cyanide to form cyanocobalamin, which is renally excreted. Advantages include the absence of methemoglobinemia and hypotension. Limitations include cost, drug incompatibilities within IV lines, and interference with certain laboratory assays.
An alternative is the traditional cyanide antidote kit, which includes amyl nitrite, sodium nitrite, and sodium thiosulfate. Nitrites induce methemoglobinemia to sequester cyanide away from mitochondria, while sodium thiosulfate enhances enzymatic detoxification via rhodanese. Nitrites should not be used empirically and require caution due to the risk of excessive methemoglobinemia and hypotension. Hyperbaric oxygen therapy may be considered as adjunctive treatment to maximize tissue oxygenation.
Medication Summary
First-line therapy is hydroxocobalamin administered intravenously at weight-based dosing, with repeat dosing if necessary. Activated charcoal may be used for recent ingestions. Second-line therapy involves the cyanide antidote kit, including carefully dosed nitrites and sodium thiosulfate. Special dosing considerations apply in pediatric patients, pregnancy, and those with hepatic or renal impairment.
Disposition And Follow-Up
All symptomatic patients require intensive care unit admission. Asymptomatic patients may be discharged after at least four hours of observation if no symptoms develop, as survival beyond this period is usually associated with full recovery. Psychiatric evaluation is indicated for intentional exposures.
Key Clinical Insights And Common Errors
In patients presenting with hypotension, seizures, altered mental status, severe lactic acidosis, and high anion gap metabolic acidosis, cyanide poisoning should be strongly considered and treated empirically. Serum lactate is a valuable surrogate marker when exposure history is suggestive. Victims of smoke inhalation may have combined cyanide toxicity, carbon monoxide poisoning, and methemoglobinemia. When carbon monoxide levels are markedly elevated, concomitant cyanide exposure should be suspected. To avoid worsening oxygen delivery, initial treatment should prioritize hydroxocobalamin or sodium thiosulfate without nitrites when methemoglobinemia would be harmful.
Overview
Cyanide toxicity occurs through inhalation or gastrointestinal absorption. Cyanide is an intracellular toxin that disrupts aerobic metabolism by inhibiting oxidative phosphorylation, resulting in impaired oxygen utilization and reduced ATP production. Detoxification primarily occurs via the hepatic mitochondrial enzyme rhodanese, which combines cyanide with sulfur in an irreversible reaction to form the less toxic, water-soluble thiocyanate. Cyanide can also bind hemoglobin to form reversible cyanhemoglobin or bind hydroxocobalamin to form nontoxic cyanocobalamin. Effective detoxification depends on adequate sulfur availability, particularly thiosulfate.
Causes And Sources
Cyanide exposure most commonly occurs during fires as a combustion by-product of natural and synthetic materials. Industrial sources include metal plating, microchip and plastic manufacturing, chemical synthesis, pesticides, and solvents such as artificial nail remover and metal polishes. Cyanide may also be produced during nitroprusside metabolism and by certain bacterial infections. Dietary sources include amygdalin-containing plants such as apricot pits, peach pits, apple seeds, pear seeds, and cassava. Jewelry making is another recognized exposure risk.
Clinical Features
The heart and brain are the most sensitive organs and are typically affected first. Neurologic manifestations include headache, confusion, syncope, seizures, and coma. Cardiovascular findings include dyspnea, chest pain, rapid progression to cardiorespiratory collapse, and death. Gastrointestinal symptoms such as nausea and vomiting may occur. Oral exposure can be caustic, with as little as 50 mg causing death. Inhalational exposure to 50 ppm may cause anxiety, palpitations, dyspnea, and headache, while concentrations of 100–135 ppm can be lethal in less than one hour.
Initial Evaluation
A history suggestive of smoke inhalation, industrial exposure, or intentional ingestion should raise suspicion. Classic findings such as the odor of bitter almonds or bright red retinal vessels are often absent. Key clinical clues include abrupt onset or rapid deterioration, severe lactic acidosis, and elevated venous oxygen saturation due to impaired cellular oxygen utilization, resulting in arterialized venous blood gases.
Diagnostic Studies
Laboratory evaluation typically includes complete blood count, metabolic panel, liver profile, creatine phosphokinase, carboxyhemoglobin, and methemoglobin levels. Cyanide levels are usually send-out tests and not available in real time; levels above 0.5–1 mg/L are toxic, and levels of 2.5–3 mg/L are often fatal. Blood gas analysis may show elevated mixed venous oxygen saturation, reduced arteriovenous oxygen difference, and markedly elevated lactate levels greater than 8 mmol/L, which serve as a useful surrogate marker when exposure history is consistent. Chest radiography may assist in evaluating concurrent inhalation injury.
Conditions To Differentiate
The differential diagnosis includes carbon monoxide poisoning, hydrogen sulfide exposure, methemoglobinemia, sulfhemoglobinemia, inert gas asphyxiation, and other causes of high anion gap metabolic acidosis.
Prehospital Management
Immediate removal from the source of exposure is critical, while preventing secondary contamination of rescuers. Contaminated clothing should be removed and bagged, and liquid exposures require thorough washing with soap and water. Vapor exposures may resolve with simple removal from the environment.
Emergency Stabilization
Initial management follows standard airway, breathing, and circulation principles. Administer 100% oxygen regardless of measured oxygen tension, as it acts synergistically with antidotes. Gastric lavage and activated charcoal may be considered for recent oral ingestion if no contraindications exist. Dermal exposures require standard decontamination measures.
Definitive Treatment
Hydroxocobalamin is the preferred first-line antidote for patients with significant toxicity, including persistent high anion gap metabolic acidosis, hyperlactatemia, seizures, syncope, dysrhythmias, or hypotension. It binds cyanide to form cyanocobalamin, which is renally excreted. Advantages include the absence of methemoglobinemia and hypotension. Limitations include cost, drug incompatibilities within IV lines, and interference with certain laboratory assays.
An alternative is the traditional cyanide antidote kit, which includes amyl nitrite, sodium nitrite, and sodium thiosulfate. Nitrites induce methemoglobinemia to sequester cyanide away from mitochondria, while sodium thiosulfate enhances enzymatic detoxification via rhodanese. Nitrites should not be used empirically and require caution due to the risk of excessive methemoglobinemia and hypotension. Hyperbaric oxygen therapy may be considered as adjunctive treatment to maximize tissue oxygenation.
Medication Summary
First-line therapy is hydroxocobalamin administered intravenously at weight-based dosing, with repeat dosing if necessary. Activated charcoal may be used for recent ingestions. Second-line therapy involves the cyanide antidote kit, including carefully dosed nitrites and sodium thiosulfate. Special dosing considerations apply in pediatric patients, pregnancy, and those with hepatic or renal impairment.
Disposition And Follow-Up
All symptomatic patients require intensive care unit admission. Asymptomatic patients may be discharged after at least four hours of observation if no symptoms develop, as survival beyond this period is usually associated with full recovery. Psychiatric evaluation is indicated for intentional exposures.
Key Clinical Insights And Common Errors
In patients presenting with hypotension, seizures, altered mental status, severe lactic acidosis, and high anion gap metabolic acidosis, cyanide poisoning should be strongly considered and treated empirically. Serum lactate is a valuable surrogate marker when exposure history is suggestive. Victims of smoke inhalation may have combined cyanide toxicity, carbon monoxide poisoning, and methemoglobinemia. When carbon monoxide levels are markedly elevated, concomitant cyanide exposure should be suspected. To avoid worsening oxygen delivery, initial treatment should prioritize hydroxocobalamin or sodium thiosulfate without nitrites when methemoglobinemia would be harmful.
- Published on
Emergency and Acute Medicine – Contact Dermatitis
Overview and Basic Description
Contact dermatitis is an inflammatory skin condition caused by direct exposure to external substances and is broadly classified into irritant, allergic, and photocontact forms. Irritant contact dermatitis is the most common type and presents as an immediate eczematous eruption resulting from a superficial inflammatory process that primarily involves the epidermis. In this condition, the triggering substance directly damages the skin, producing a non-immunologic inflammatory reaction manifested by erythema, dryness, cracking, or fissuring. It typically occurs due to repeated exposure to mild irritants such as water, soaps, heat, or friction. Symptoms often develop gradually and include itching or burning sensations, with lesions that have indistinct borders. The hands are most commonly affected, and the skin may appear dry, red, rough, and occasionally vesiculated or fissured. Frequent irritants include cement, hair dyes, wet diapers, rubber gloves, shampoos, and repeated handwashing.
Allergic contact dermatitis is a delayed type IV hypersensitivity reaction that requires prior sensitization. In this form, exposure to an allergen triggers an immune-mediated response, leading to localized edema, erythema, vesicles, pruritus, or burning. Lesions usually correspond exactly to the area of contact, such as beneath a watchband. In previously sensitized individuals, symptoms typically appear within 12–48 hours, whereas primary exposure may require 14–21 days before clinical manifestations develop. Common allergens include nickel, gold, neomycin, bacitracin, preservatives, fragrances, dyes, and poison ivy.
Photocontact dermatitis occurs when an otherwise harmless substance on the skin interacts with ultraviolet light, producing an inflammatory reaction. This type of dermatitis does not occur without sunlight exposure and is commonly associated with shaving lotions, sunscreens, sulfa-containing ointments, and perfumes.
Pediatric Considerations
Allergic contact dermatitis is less common in children, particularly infants, compared with adults. In pediatric patients, the major sources of contact allergy include metals, shoes, preservatives, and fragrances found in cosmetics, topical medications, and plants. Diaper dermatitis represents the prototype of irritant contact dermatitis in children and results from prolonged exposure to urine and feces. Circumoral dermatitis is seen in infants and young children and may be triggered by certain foods through either irritant or allergic mechanisms.
Etiology and Risk Factors
Irritant contact dermatitis accounts for approximately 80% of all cases and may be caused by soaps, solvents, chemicals, certain foods, urine, feces, diapers, and continuous or repeated exposure to moisture such as frequent handwashing. Physical irritants including coarse paper, glass fibers, and wool may also provoke dermatitis. Shoe dermatitis is a common presentation and is typically identified by lesions limited to the distal dorsal surface of the foot while sparing the interdigital spaces.
Allergic contact dermatitis may result from exposure to plants such as poison ivy, poison oak, and poison sumac, collectively referred to as rhus dermatitis, which is the most common form of allergic contact dermatitis in North America. The reaction is caused by oleoresin urushiol and may occur through direct contact with the plant or indirectly via contaminated pets, clothing, or smoke from burning leaves. Lesions may appear up to three days after exposure in sensitized individuals and may persist for as long as three weeks. The fluid contained within vesicles is not contagious and does not produce new lesions; however, urushiol oil on clothing or animal fur remains contagious until removed. Other allergic causes include cement, which may result in severe alkali burns with prolonged exposure, metals—especially nickel—solvents, epoxy, chemicals in rubber or leather, lotions, cosmetics, topical medications such as neomycin, hydrocortisone, benzocaine, and parabens, and certain foods. The ability to respond to specific antigens is likely influenced by genetic factors.
Photodermatitis represents an inflammatory reaction caused by exposure to an irritant, often plant sap, in combination with sunlight and typically does not occur in the absence of ultraviolet exposure.
Clinical Features and Diagnostic Evaluation
Assessment begins with a detailed history focusing on the date of onset, time course, pattern and distribution of lesions, relationship to occupational or work exposures, presence or absence of pruritus, mucosal involvement, and recent exposure to new products such as soaps, lotions, cosmetics, foods, medications, or jewelry. Physical examination should emphasize the morphology and distribution of the rash. Acute lesions are characterized by erythema and pruritus and may be accompanied by edema, papules, vesicles, bullae, serous discharge, or crusting. Subacute lesions demonstrate less prominent vesiculation, while chronic lesions may present with scaling, lichenification, pigmentation changes, or fissuring, often with little or no vesiculation and a characteristic distribution pattern.
There are no specific laboratory studies or imaging modalities that are routinely helpful in the emergency department for diagnosing contact dermatitis. Patch testing is generally not performed acutely and should be arranged through referral to an allergist or immunologist. When a fungal infection is suspected, a Wood lamp examination may be used to assess for fluorescence suggestive of tinea.
Differential Diagnosis
Conditions that may mimic contact dermatitis include atopic dermatitis, often associated with a family history of atopy; seborrheic dermatitis with greasy, scaly lesions; nummular dermatitis characterized by coin-shaped plaques; and intertrigo involving areas where skin surfaces are in apposition such as the axillae and groin. Other considerations include infectious eczematous dermatitis with secondary bacterial infection, usually due to Staphylococcus aureus; cellulitis presenting as a warm, painful, blanching lesion; impetigo with yellow crusting; scabies with intensely pruritic interdigital tracks; psoriasis with well-demarcated silvery plaques affecting extensor surfaces, scalp, or genital region; herpes simplex infection with painful grouped vesicles; herpes zoster following a dermatomal distribution; bullous pemphigoid with diffuse bullae; tinea with maximal involvement at the margins and Wood lamp fluorescence; pityriasis alba with asymptomatic hypopigmented lesions; urticaria with pruritic wheals and surrounding erythema; acrodermatitis enteropathica due to zinc deficiency, associated with failure to thrive, diarrhea, and alopecia; dyshidrotic eczema; drug-induced rashes; Stevens–Johnson syndrome; toxic epidermal necrolysis; and erythema nodosum.
Management in the Emergency Department
Initial stabilization is rarely required unless there is significant concomitant pathology. Treatment is primarily symptomatic and includes gentle cleansing of the affected area with mild soap and water, removal and avoidance of the offending agent, and washing of contaminated clothing. Cool, wet compresses are particularly effective during the acute blistering phase. Antipruritic therapy may include topical agents such as calamine lotion and topical corticosteroids, although corticosteroids do not penetrate intact blisters and benzocaine- or hydrocortisone-containing products should be avoided due to the risk of further sensitization. Systemic therapy may include antihistamines and corticosteroids when indicated. Aluminum acetate (Burrow solution) may be applied to weeping surfaces.
For irritant contact dermatitis, management focuses on removal of the offending agent, thorough washing with soap and warm water, reduction of wet–dry cycles such as frequent handwashing, and use of alcohol-based cleansers to decrease repetitive trauma. Bland emollients are recommended, and topical corticosteroids of medium to high potency, preferably in ointment form, may be used for severe cases on the hands twice daily for several weeks.
Allergic contact dermatitis is treated with topical corticosteroids applied twice daily for two to three weeks, with potency adjusted by location: low potency for the face, medium potency for the arms, legs, and trunk, and high potency for the hands and feet. Oral corticosteroids may be required for severe reactions. In rhus dermatitis, additional measures include washing all clothing and pets that may have come into contact with the plant, as the oil remains contagious. Oatmeal baths may provide symptomatic relief, and aseptic aspiration of tense bullae can reduce discomfort. Severe reactions involving more than 10% of total body surface area require systemic corticosteroids for two to three weeks with a gradual taper, as premature discontinuation may result in rapid rebound of symptoms. Shoe dermatitis management includes wearing open-toe, canvas, or vinyl shoes, controlling perspiration through frequent sock changes, and using absorbent powders. Diaper dermatitis management includes topical zinc oxide, petrolatum, or aquaphor and frequent diaper changes after each soiling.
Medications
Systemic therapy may include H1-receptor antagonists from both first- and second-generation antihistamines. Cetirizine may be given at 5–10 mg orally daily in adults and children older than six years, with pediatric dosing of 2.5 mg once or twice daily for ages two to six years. Diphenhydramine may be administered at 25–50 mg intravenously, intramuscularly, or orally every six hours as needed, with pediatric dosing of 5 mg/kg per 24 hours divided every six hours. Fexofenadine may be used at 60 mg orally twice daily or 180 mg once daily in adults, with pediatric dosing of 30 mg twice daily for children aged six to twelve years. Hydroxyzine may be given at 25–50 mg orally or intramuscularly up to four times daily, with weight-based pediatric dosing. Loratadine may be administered at 10 mg orally twice daily. For refractory pruritus, doxepin 75 mg orally daily may be effective.
Systemic corticosteroid therapy includes prednisone at 40–60 mg orally daily in adults, with pediatric dosing of 1–2 mg/kg per day to a maximum of 80 mg, administered once or divided twice daily. Topical therapies include aluminum acetate solution applied for 20 minutes three times daily until the skin is dry, calamine lotion every six hours as needed, and topical corticosteroids such as triamcinolone ointment, cream, or lotion at concentrations of 0.025% or 0.1% applied three to four times daily. Topical corticosteroids should not be applied to the face or eyelids. First-line therapy consists of topical corticosteroids and oral antihistamines, while oral corticosteroids are considered second-line treatment.
Disposition and Follow-Up
Hospital admission is rarely indicated and is generally reserved for patients with severe systemic reactions or significant secondary infections. Patients may be discharged once symptomatic relief is achieved and adequate outpatient follow-up is arranged. Follow-up with a primary care physician is recommended within two to three days for reassessment. Patients should be instructed to return to the emergency department if they develop facial swelling, difficulty breathing, or mucosal involvement that limits oral intake.
Clinical Pearls and Pitfalls
Effective management requires prompt removal of the offending agent. Clinicians should remain vigilant for progression to systemic anaphylaxis, particularly in cases involving latex exposure, and should monitor for concurrent bacterial infections. In rhus dermatitis, lesions are no longer contagious after washing with soap and water; however, all clothing and animals that may have been exposed must be thoroughly cleaned, as the oil remains contagious until removed.
Overview and Basic Description
Contact dermatitis is an inflammatory skin condition caused by direct exposure to external substances and is broadly classified into irritant, allergic, and photocontact forms. Irritant contact dermatitis is the most common type and presents as an immediate eczematous eruption resulting from a superficial inflammatory process that primarily involves the epidermis. In this condition, the triggering substance directly damages the skin, producing a non-immunologic inflammatory reaction manifested by erythema, dryness, cracking, or fissuring. It typically occurs due to repeated exposure to mild irritants such as water, soaps, heat, or friction. Symptoms often develop gradually and include itching or burning sensations, with lesions that have indistinct borders. The hands are most commonly affected, and the skin may appear dry, red, rough, and occasionally vesiculated or fissured. Frequent irritants include cement, hair dyes, wet diapers, rubber gloves, shampoos, and repeated handwashing.
Allergic contact dermatitis is a delayed type IV hypersensitivity reaction that requires prior sensitization. In this form, exposure to an allergen triggers an immune-mediated response, leading to localized edema, erythema, vesicles, pruritus, or burning. Lesions usually correspond exactly to the area of contact, such as beneath a watchband. In previously sensitized individuals, symptoms typically appear within 12–48 hours, whereas primary exposure may require 14–21 days before clinical manifestations develop. Common allergens include nickel, gold, neomycin, bacitracin, preservatives, fragrances, dyes, and poison ivy.
Photocontact dermatitis occurs when an otherwise harmless substance on the skin interacts with ultraviolet light, producing an inflammatory reaction. This type of dermatitis does not occur without sunlight exposure and is commonly associated with shaving lotions, sunscreens, sulfa-containing ointments, and perfumes.
Pediatric Considerations
Allergic contact dermatitis is less common in children, particularly infants, compared with adults. In pediatric patients, the major sources of contact allergy include metals, shoes, preservatives, and fragrances found in cosmetics, topical medications, and plants. Diaper dermatitis represents the prototype of irritant contact dermatitis in children and results from prolonged exposure to urine and feces. Circumoral dermatitis is seen in infants and young children and may be triggered by certain foods through either irritant or allergic mechanisms.
Etiology and Risk Factors
Irritant contact dermatitis accounts for approximately 80% of all cases and may be caused by soaps, solvents, chemicals, certain foods, urine, feces, diapers, and continuous or repeated exposure to moisture such as frequent handwashing. Physical irritants including coarse paper, glass fibers, and wool may also provoke dermatitis. Shoe dermatitis is a common presentation and is typically identified by lesions limited to the distal dorsal surface of the foot while sparing the interdigital spaces.
Allergic contact dermatitis may result from exposure to plants such as poison ivy, poison oak, and poison sumac, collectively referred to as rhus dermatitis, which is the most common form of allergic contact dermatitis in North America. The reaction is caused by oleoresin urushiol and may occur through direct contact with the plant or indirectly via contaminated pets, clothing, or smoke from burning leaves. Lesions may appear up to three days after exposure in sensitized individuals and may persist for as long as three weeks. The fluid contained within vesicles is not contagious and does not produce new lesions; however, urushiol oil on clothing or animal fur remains contagious until removed. Other allergic causes include cement, which may result in severe alkali burns with prolonged exposure, metals—especially nickel—solvents, epoxy, chemicals in rubber or leather, lotions, cosmetics, topical medications such as neomycin, hydrocortisone, benzocaine, and parabens, and certain foods. The ability to respond to specific antigens is likely influenced by genetic factors.
Photodermatitis represents an inflammatory reaction caused by exposure to an irritant, often plant sap, in combination with sunlight and typically does not occur in the absence of ultraviolet exposure.
Clinical Features and Diagnostic Evaluation
Assessment begins with a detailed history focusing on the date of onset, time course, pattern and distribution of lesions, relationship to occupational or work exposures, presence or absence of pruritus, mucosal involvement, and recent exposure to new products such as soaps, lotions, cosmetics, foods, medications, or jewelry. Physical examination should emphasize the morphology and distribution of the rash. Acute lesions are characterized by erythema and pruritus and may be accompanied by edema, papules, vesicles, bullae, serous discharge, or crusting. Subacute lesions demonstrate less prominent vesiculation, while chronic lesions may present with scaling, lichenification, pigmentation changes, or fissuring, often with little or no vesiculation and a characteristic distribution pattern.
There are no specific laboratory studies or imaging modalities that are routinely helpful in the emergency department for diagnosing contact dermatitis. Patch testing is generally not performed acutely and should be arranged through referral to an allergist or immunologist. When a fungal infection is suspected, a Wood lamp examination may be used to assess for fluorescence suggestive of tinea.
Differential Diagnosis
Conditions that may mimic contact dermatitis include atopic dermatitis, often associated with a family history of atopy; seborrheic dermatitis with greasy, scaly lesions; nummular dermatitis characterized by coin-shaped plaques; and intertrigo involving areas where skin surfaces are in apposition such as the axillae and groin. Other considerations include infectious eczematous dermatitis with secondary bacterial infection, usually due to Staphylococcus aureus; cellulitis presenting as a warm, painful, blanching lesion; impetigo with yellow crusting; scabies with intensely pruritic interdigital tracks; psoriasis with well-demarcated silvery plaques affecting extensor surfaces, scalp, or genital region; herpes simplex infection with painful grouped vesicles; herpes zoster following a dermatomal distribution; bullous pemphigoid with diffuse bullae; tinea with maximal involvement at the margins and Wood lamp fluorescence; pityriasis alba with asymptomatic hypopigmented lesions; urticaria with pruritic wheals and surrounding erythema; acrodermatitis enteropathica due to zinc deficiency, associated with failure to thrive, diarrhea, and alopecia; dyshidrotic eczema; drug-induced rashes; Stevens–Johnson syndrome; toxic epidermal necrolysis; and erythema nodosum.
Management in the Emergency Department
Initial stabilization is rarely required unless there is significant concomitant pathology. Treatment is primarily symptomatic and includes gentle cleansing of the affected area with mild soap and water, removal and avoidance of the offending agent, and washing of contaminated clothing. Cool, wet compresses are particularly effective during the acute blistering phase. Antipruritic therapy may include topical agents such as calamine lotion and topical corticosteroids, although corticosteroids do not penetrate intact blisters and benzocaine- or hydrocortisone-containing products should be avoided due to the risk of further sensitization. Systemic therapy may include antihistamines and corticosteroids when indicated. Aluminum acetate (Burrow solution) may be applied to weeping surfaces.
For irritant contact dermatitis, management focuses on removal of the offending agent, thorough washing with soap and warm water, reduction of wet–dry cycles such as frequent handwashing, and use of alcohol-based cleansers to decrease repetitive trauma. Bland emollients are recommended, and topical corticosteroids of medium to high potency, preferably in ointment form, may be used for severe cases on the hands twice daily for several weeks.
Allergic contact dermatitis is treated with topical corticosteroids applied twice daily for two to three weeks, with potency adjusted by location: low potency for the face, medium potency for the arms, legs, and trunk, and high potency for the hands and feet. Oral corticosteroids may be required for severe reactions. In rhus dermatitis, additional measures include washing all clothing and pets that may have come into contact with the plant, as the oil remains contagious. Oatmeal baths may provide symptomatic relief, and aseptic aspiration of tense bullae can reduce discomfort. Severe reactions involving more than 10% of total body surface area require systemic corticosteroids for two to three weeks with a gradual taper, as premature discontinuation may result in rapid rebound of symptoms. Shoe dermatitis management includes wearing open-toe, canvas, or vinyl shoes, controlling perspiration through frequent sock changes, and using absorbent powders. Diaper dermatitis management includes topical zinc oxide, petrolatum, or aquaphor and frequent diaper changes after each soiling.
Medications
Systemic therapy may include H1-receptor antagonists from both first- and second-generation antihistamines. Cetirizine may be given at 5–10 mg orally daily in adults and children older than six years, with pediatric dosing of 2.5 mg once or twice daily for ages two to six years. Diphenhydramine may be administered at 25–50 mg intravenously, intramuscularly, or orally every six hours as needed, with pediatric dosing of 5 mg/kg per 24 hours divided every six hours. Fexofenadine may be used at 60 mg orally twice daily or 180 mg once daily in adults, with pediatric dosing of 30 mg twice daily for children aged six to twelve years. Hydroxyzine may be given at 25–50 mg orally or intramuscularly up to four times daily, with weight-based pediatric dosing. Loratadine may be administered at 10 mg orally twice daily. For refractory pruritus, doxepin 75 mg orally daily may be effective.
Systemic corticosteroid therapy includes prednisone at 40–60 mg orally daily in adults, with pediatric dosing of 1–2 mg/kg per day to a maximum of 80 mg, administered once or divided twice daily. Topical therapies include aluminum acetate solution applied for 20 minutes three times daily until the skin is dry, calamine lotion every six hours as needed, and topical corticosteroids such as triamcinolone ointment, cream, or lotion at concentrations of 0.025% or 0.1% applied three to four times daily. Topical corticosteroids should not be applied to the face or eyelids. First-line therapy consists of topical corticosteroids and oral antihistamines, while oral corticosteroids are considered second-line treatment.
Disposition and Follow-Up
Hospital admission is rarely indicated and is generally reserved for patients with severe systemic reactions or significant secondary infections. Patients may be discharged once symptomatic relief is achieved and adequate outpatient follow-up is arranged. Follow-up with a primary care physician is recommended within two to three days for reassessment. Patients should be instructed to return to the emergency department if they develop facial swelling, difficulty breathing, or mucosal involvement that limits oral intake.
Clinical Pearls and Pitfalls
Effective management requires prompt removal of the offending agent. Clinicians should remain vigilant for progression to systemic anaphylaxis, particularly in cases involving latex exposure, and should monitor for concurrent bacterial infections. In rhus dermatitis, lesions are no longer contagious after washing with soap and water; however, all clothing and animals that may have been exposed must be thoroughly cleaned, as the oil remains contagious until removed.
- Published on
Emergency And Acute Medicine – Congenital Heart Disease, Cyanotic
Description
Cyanotic congenital heart disease results from abnormal embryologic cardiac development that allows mixing of deoxygenated and oxygenated blood into the systemic circulation. This occurs through right-to-left intracardiac shunting or anatomic defects involving the great vessels. Classic subtypes include the “five Ts,” the “two Es,” and single-ventricle physiology. These conditions include tetralogy of Fallot, transposition of the great arteries, tricuspid atresia, truncus arteriosus, total anomalous pulmonary venous return, Ebstein anomaly of the tricuspid valve, Eisenmenger syndrome, and single-ventricle physiology. All lead to varying degrees of systemic hypoxemia.
Etiology
For most cyanotic congenital heart defects, the precise cause is unknown. Genetic and environmental contributions may play a role, but no single unifying etiology is identified in the majority of cases.
Emergency Presentation
The most common initial emergency department presentations include central cyanosis, congestive heart failure, and circulatory collapse. In older children with known cyanotic heart disease, physiologic stress such as fever, dehydration, pulmonary disease, decreased systemic vascular resistance, or obstruction of a cardiac shunt can precipitate worsening cyanosis.
Clinical Features
Central cyanosis is typically visible in the lips, nail beds, and mucous membranes and worsens with crying or agitation, with minimal improvement on administration of 100% oxygen. Signs of congestive heart failure include rales, gallop rhythm, hepatomegaly, and scalp edema. Hypercyanotic spells, or “Tet spells,” present with restlessness, hyperpnea, progressive cyanosis, and possible syncope, often triggered by feeding, crying, or exertion. Older children may instinctively squat to improve symptoms.
History
A family history of congenital heart disease increases risk, especially if a parent or sibling is affected. Prenatal history may reveal teratogen exposure or abnormal fetal ultrasound findings. Tetralogy of Fallot is often asymptomatic at birth, with symptoms developing as right ventricular outflow obstruction worsens. Tricuspid atresia usually presents with cyanosis from birth. Ebstein anomaly may present later in adolescence with dysrhythmias. Transposition of the great arteries often presents within the first hours to days of life. Total anomalous pulmonary venous return may present with severe neonatal illness or later with heart failure if unobstructed. Truncus arteriosus causes mild neonatal cyanosis with progressive heart failure in infancy.
Physical Examination
Tetralogy of Fallot is characterized by a loud systolic murmur along the left sternal border, a single loud second heart sound, and right ventricular prominence. Chronic disease leads to clubbing and retinal engorgement. Tricuspid atresia presents with tachypnea, a regurgitant murmur from an associated ventricular septal defect, a single second heart sound, and a prominent left ventricular impulse. Ebstein anomaly produces holosystolic tricuspid regurgitation murmurs and may include gallop rhythms. Transposition of the great arteries is notable for severe hypoxemia with a single loud second heart sound. Total anomalous pulmonary venous return presents with tachypnea, murmurs, fixed split second heart sound, and hepatomegaly. Truncus arteriosus causes bounding pulses, wide pulse pressure, a loud single second heart sound, and systolic and diastolic murmurs.
Essential Diagnostic Evaluation
Initial evaluation includes pulse oximetry, arterial blood gas analysis, complete blood count, glucose testing, and a full sepsis evaluation. Chest radiography assesses pulmonary blood flow, while electrocardiography evaluates chamber hypertrophy and axis deviation. Early cardiology consultation is essential.
Diagnostic Tests And Interpretation
Arterial blood gases show reduced oxygen saturation on room air. The hyperoxia test helps differentiate pulmonary disease from cyanotic congenital heart disease, with a PaO₂ less than 100 mm Hg after 100% oxygen strongly suggesting intracardiac shunting. Chronic cyanosis leads to erythrocytosis on complete blood count. Chest radiography may show decreased pulmonary blood flow in tetralogy of Fallot or tricuspid atresia and increased flow in transposition, total anomalous pulmonary venous return, and truncus arteriosus. Classic radiographic signs include the boot-shaped heart of tetralogy of Fallot, the egg-on-a-string appearance of transposition of the great arteries, and the snowman sign in supracardiac total anomalous pulmonary venous return. Electrocardiography demonstrates characteristic patterns of axis deviation and ventricular hypertrophy depending on the lesion.
Differential Diagnosis
The differential includes pulmonary causes such as pneumothorax, pulmonary hypertension, pneumonia, bronchiolitis, and diaphragmatic hernia; cardiac causes such as congestive heart failure and cardiogenic shock; infectious causes including sepsis; neurologic causes such as seizures; and metabolic or hematologic conditions including hypoglycemia, dehydration, polycythemia, and methemoglobinemia.
Initial Stabilization And Therapy
Management focuses on maintaining warmth, correcting hypoglycemia and acidosis, ensuring adequate oxygenation, establishing intravenous access, and preparing for airway support. Excessive oxygen should be avoided because high oxygen tension promotes ductal closure. Air filters should be placed on intravenous lines to prevent paradoxical emboli.
Emergency Department Management
Prostaglandin E1 infusion should be initiated in duct-dependent lesions to maintain or reopen the ductus arteriosus, typically at 0.05–0.1 μg/kg/min. Complications include apnea, bradycardia, hypotension, and seizures, so airway readiness is essential. Prostaglandin is ineffective in obstructed total anomalous pulmonary venous return, which may require extracorporeal support. Fluid resuscitation should be performed cautiously in 10 mL/kg increments. Hypercyanotic spells are managed with a calm environment, knee-chest positioning, supplemental oxygen if tolerated, and morphine. Severe cases may require bicarbonate, phenylephrine to increase systemic vascular resistance, or propranolol for beta-blockade. Circulatory collapse requires aggressive resuscitation with fluids, inotropes, and correction of acidosis.
Medications
Commonly used medications include prostaglandin E1, morphine, phenylephrine, propranolol, dopamine, dobutamine, milrinone, antibiotics such as ampicillin and gentamicin, antipyretics, and sodium bicarbonate when indicated.
Disposition And Follow-Up
All newborns with suspected cyanotic congenital heart disease require admission to a pediatric intensive care unit. Admission is also indicated for acute worsening of cyanosis, heart failure, or respiratory infection. Discharge decisions should be made in consultation with pediatric cardiology and reserved for carefully selected, stable patients with ensured close follow-up.
Referral And Follow-Up Recommendations
Care should be coordinated among primary care providers, pediatric cardiologists, and cardiothoracic surgeons. Clear follow-up plans and return precautions are essential, as physiologic stress can rapidly worsen clinical status.
Clinical Pearls And Pitfalls
Visible cyanosis requires significant levels of deoxygenated hemoglobin. Duct-dependent lesions often present at two to three weeks of age with sudden cyanosis or cardiovascular collapse. Prostaglandin E1 can be lifesaving but requires close monitoring for apnea and hypotension.
Description
Cyanotic congenital heart disease results from abnormal embryologic cardiac development that allows mixing of deoxygenated and oxygenated blood into the systemic circulation. This occurs through right-to-left intracardiac shunting or anatomic defects involving the great vessels. Classic subtypes include the “five Ts,” the “two Es,” and single-ventricle physiology. These conditions include tetralogy of Fallot, transposition of the great arteries, tricuspid atresia, truncus arteriosus, total anomalous pulmonary venous return, Ebstein anomaly of the tricuspid valve, Eisenmenger syndrome, and single-ventricle physiology. All lead to varying degrees of systemic hypoxemia.
Etiology
For most cyanotic congenital heart defects, the precise cause is unknown. Genetic and environmental contributions may play a role, but no single unifying etiology is identified in the majority of cases.
Emergency Presentation
The most common initial emergency department presentations include central cyanosis, congestive heart failure, and circulatory collapse. In older children with known cyanotic heart disease, physiologic stress such as fever, dehydration, pulmonary disease, decreased systemic vascular resistance, or obstruction of a cardiac shunt can precipitate worsening cyanosis.
Clinical Features
Central cyanosis is typically visible in the lips, nail beds, and mucous membranes and worsens with crying or agitation, with minimal improvement on administration of 100% oxygen. Signs of congestive heart failure include rales, gallop rhythm, hepatomegaly, and scalp edema. Hypercyanotic spells, or “Tet spells,” present with restlessness, hyperpnea, progressive cyanosis, and possible syncope, often triggered by feeding, crying, or exertion. Older children may instinctively squat to improve symptoms.
History
A family history of congenital heart disease increases risk, especially if a parent or sibling is affected. Prenatal history may reveal teratogen exposure or abnormal fetal ultrasound findings. Tetralogy of Fallot is often asymptomatic at birth, with symptoms developing as right ventricular outflow obstruction worsens. Tricuspid atresia usually presents with cyanosis from birth. Ebstein anomaly may present later in adolescence with dysrhythmias. Transposition of the great arteries often presents within the first hours to days of life. Total anomalous pulmonary venous return may present with severe neonatal illness or later with heart failure if unobstructed. Truncus arteriosus causes mild neonatal cyanosis with progressive heart failure in infancy.
Physical Examination
Tetralogy of Fallot is characterized by a loud systolic murmur along the left sternal border, a single loud second heart sound, and right ventricular prominence. Chronic disease leads to clubbing and retinal engorgement. Tricuspid atresia presents with tachypnea, a regurgitant murmur from an associated ventricular septal defect, a single second heart sound, and a prominent left ventricular impulse. Ebstein anomaly produces holosystolic tricuspid regurgitation murmurs and may include gallop rhythms. Transposition of the great arteries is notable for severe hypoxemia with a single loud second heart sound. Total anomalous pulmonary venous return presents with tachypnea, murmurs, fixed split second heart sound, and hepatomegaly. Truncus arteriosus causes bounding pulses, wide pulse pressure, a loud single second heart sound, and systolic and diastolic murmurs.
Essential Diagnostic Evaluation
Initial evaluation includes pulse oximetry, arterial blood gas analysis, complete blood count, glucose testing, and a full sepsis evaluation. Chest radiography assesses pulmonary blood flow, while electrocardiography evaluates chamber hypertrophy and axis deviation. Early cardiology consultation is essential.
Diagnostic Tests And Interpretation
Arterial blood gases show reduced oxygen saturation on room air. The hyperoxia test helps differentiate pulmonary disease from cyanotic congenital heart disease, with a PaO₂ less than 100 mm Hg after 100% oxygen strongly suggesting intracardiac shunting. Chronic cyanosis leads to erythrocytosis on complete blood count. Chest radiography may show decreased pulmonary blood flow in tetralogy of Fallot or tricuspid atresia and increased flow in transposition, total anomalous pulmonary venous return, and truncus arteriosus. Classic radiographic signs include the boot-shaped heart of tetralogy of Fallot, the egg-on-a-string appearance of transposition of the great arteries, and the snowman sign in supracardiac total anomalous pulmonary venous return. Electrocardiography demonstrates characteristic patterns of axis deviation and ventricular hypertrophy depending on the lesion.
Differential Diagnosis
The differential includes pulmonary causes such as pneumothorax, pulmonary hypertension, pneumonia, bronchiolitis, and diaphragmatic hernia; cardiac causes such as congestive heart failure and cardiogenic shock; infectious causes including sepsis; neurologic causes such as seizures; and metabolic or hematologic conditions including hypoglycemia, dehydration, polycythemia, and methemoglobinemia.
Initial Stabilization And Therapy
Management focuses on maintaining warmth, correcting hypoglycemia and acidosis, ensuring adequate oxygenation, establishing intravenous access, and preparing for airway support. Excessive oxygen should be avoided because high oxygen tension promotes ductal closure. Air filters should be placed on intravenous lines to prevent paradoxical emboli.
Emergency Department Management
Prostaglandin E1 infusion should be initiated in duct-dependent lesions to maintain or reopen the ductus arteriosus, typically at 0.05–0.1 μg/kg/min. Complications include apnea, bradycardia, hypotension, and seizures, so airway readiness is essential. Prostaglandin is ineffective in obstructed total anomalous pulmonary venous return, which may require extracorporeal support. Fluid resuscitation should be performed cautiously in 10 mL/kg increments. Hypercyanotic spells are managed with a calm environment, knee-chest positioning, supplemental oxygen if tolerated, and morphine. Severe cases may require bicarbonate, phenylephrine to increase systemic vascular resistance, or propranolol for beta-blockade. Circulatory collapse requires aggressive resuscitation with fluids, inotropes, and correction of acidosis.
Medications
Commonly used medications include prostaglandin E1, morphine, phenylephrine, propranolol, dopamine, dobutamine, milrinone, antibiotics such as ampicillin and gentamicin, antipyretics, and sodium bicarbonate when indicated.
Disposition And Follow-Up
All newborns with suspected cyanotic congenital heart disease require admission to a pediatric intensive care unit. Admission is also indicated for acute worsening of cyanosis, heart failure, or respiratory infection. Discharge decisions should be made in consultation with pediatric cardiology and reserved for carefully selected, stable patients with ensured close follow-up.
Referral And Follow-Up Recommendations
Care should be coordinated among primary care providers, pediatric cardiologists, and cardiothoracic surgeons. Clear follow-up plans and return precautions are essential, as physiologic stress can rapidly worsen clinical status.
Clinical Pearls And Pitfalls
Visible cyanosis requires significant levels of deoxygenated hemoglobin. Duct-dependent lesions often present at two to three weeks of age with sudden cyanosis or cardiovascular collapse. Prostaglandin E1 can be lifesaving but requires close monitoring for apnea and hypotension.
- Published on
Emergency And Acute Medicine – Congenital Heart Disease, Acyanotic
Description
Acyanotic congenital heart disease refers to structural abnormalities of the cardiocirculatory system present at birth that do not result in mixing of deoxygenated and oxygenated blood. These defects commonly produce left-to-right shunting or obstruct ventricular outflow. Left-to-right shunt lesions include ventricular septal defect, atrial septal defect, patent ductus arteriosus, and endocardial cushion (atrioventricular canal) defects. Ventricular outflow obstruction lesions include coarctation of the aorta, aortic stenosis, pulmonic stenosis, and hypoplastic left heart syndrome. Several of these conditions are ductal dependent, with clinical deterioration occurring as the ductus arteriosus closes, particularly in coarctation of the aorta, critical aortic stenosis, critical pulmonic stenosis, and hypoplastic left heart syndrome.
Etiology
In most cases, the underlying cause is unknown. Genetic associations include trisomy 21 with atrioventricular canal defects and Turner syndrome with coarctation of the aorta. Environmental causes include congenital rubella infection, which is associated with patent ductus arteriosus and aortic stenosis.
Clinical Presentation
Many patients are asymptomatic early in life. Symptomatic infants may present with lethargy, poor feeding, failure to thrive, dyspnea with exertion or feeding, and recurrent respiratory infections.
Physical Examination
Ventricular septal defects and atrioventricular canal defects are associated with a dusky appearance, hepatomegaly, holosystolic or diastolic murmurs with thrills, a hyperdynamic precordium, and a displaced point of maximal impulse. Atrial septal defects typically produce a fixed split second heart sound with systolic ejection and diastolic murmurs. Patent ductus arteriosus presents with a continuous “machine-like” murmur and bounding peripheral pulses. Coarctation of the aorta is characterized by differential cyanosis, higher blood pressure in the upper extremities than the lower extremities, and diminished or absent femoral pulses. Aortic stenosis produces a harsh systolic murmur with a thrill and an aortic click. Pulmonic stenosis causes a systolic ejection murmur with a thrill, pulmonic click, widely split second heart sound, and jugular venous A waves. Hypoplastic left heart syndrome presents with a dusky, listless, tachypneic infant, diminished pulses, a single heart sound, and a systolic ejection murmur.
Essential Diagnostic Evaluation
Initial evaluation includes pre- and postductal oxygen saturation measurement, arterial blood gas analysis, complete blood count, basic metabolic panel, glucose testing, and a full sepsis evaluation. Chest radiography is used to assess pulmonary blood flow, while electrocardiography evaluates cardiac axis, chamber hypertrophy, and conduction abnormalities. Four-extremity blood pressure measurements are essential. Early cardiology consultation is required.
Diagnostic Tests And Interpretation
Chest radiography in left-to-right shunting lesions typically demonstrates cardiomegaly with increased pulmonary vascular markings. Chamber enlargement patterns vary by lesion, with atrial septal defects enlarging the right atrium and right ventricle, ventricular septal defects enlarging the right ventricle and left atrium, and patent ductus arteriosus enlarging the left atrium and left ventricle. Atrioventricular canal defects often produce a globular heart with enlargement of all chambers. Obstructive lesions may show a normal cardiac silhouette or cardiomegaly. Electrocardiographic findings vary by lesion and may include right or left axis deviation, ventricular hypertrophy, bundle branch block, prolonged PR interval, or peaked P waves, depending on the specific defect.
Differential Diagnosis
Conditions to consider include congestive heart failure, hypertrophic cardiomyopathy, cardiogenic shock, aortic dissection, myocarditis, bronchopulmonary dysplasia, pulmonary hypertension, pneumonia or bronchiolitis, hypoglycemia, adrenal insufficiency or congenital adrenal hyperplasia, glycogen storage diseases, sepsis, and other causes of shock.
Initial Stabilization And Therapy
Initial management focuses on maintaining warmth and adequate oxygenation, correcting hypoglycemia and metabolic acidosis, establishing intravenous access, and preparing for airway support if needed. Excessively high oxygen concentrations should be avoided, as they promote ductal closure.
Emergency Department Management
Prostaglandin E1 infusion should be initiated to maintain or reopen ductal patency in ductal-dependent lesions, typically at 0.05–0.1 μg/kg/min by continuous intravenous infusion. Potential complications include apnea, bradycardia, hypotension, and seizures. A full septic evaluation with empiric antibiotics should be performed while alternative causes are addressed. Circulatory collapse related to congenital heart disease is treated with cautious fluid resuscitation in 10 mL/kg increments, inotropic support, and aggressive correction of acidosis. Congestive heart failure is managed with diuretics and digoxin when appropriate.
Medications
Commonly used medications include ampicillin, gentamicin, prostaglandin E1, furosemide, digoxin, dopamine, dobutamine, epinephrine, milrinone, and sodium bicarbonate. Digoxin dosing requires extreme caution due to its narrow therapeutic window.
Disposition And Follow-Up
All newborns with suspected congenital heart disease require admission to a pediatric intensive care unit. Admission is also indicated for patients with acute worsening of heart failure, respiratory infection, or hemodynamic instability. Discharge decisions should only be made in conjunction with a pediatric cardiologist.
Referral And Follow-Up Recommendations
Ongoing care should be coordinated by the primary care physician in collaboration with pediatric cardiology and cardiothoracic surgery. Follow-up plans must be individualized based on the specific lesion and clinical course.
Clinical Pearls And Pitfalls
Acyanotic lesions often become symptomatic between 2 and 12 weeks of age as the ductus arteriosus closes or pulmonary vascular resistance decreases. Coarctation commonly presents as ductal closure occurs, while septal defects become apparent as pulmonary resistance falls. A superior QRS axis on ECG is characteristic of atrioventricular canal defects, and rib notching on chest radiography is a late finding in coarctation of the aorta.
Description
Acyanotic congenital heart disease refers to structural abnormalities of the cardiocirculatory system present at birth that do not result in mixing of deoxygenated and oxygenated blood. These defects commonly produce left-to-right shunting or obstruct ventricular outflow. Left-to-right shunt lesions include ventricular septal defect, atrial septal defect, patent ductus arteriosus, and endocardial cushion (atrioventricular canal) defects. Ventricular outflow obstruction lesions include coarctation of the aorta, aortic stenosis, pulmonic stenosis, and hypoplastic left heart syndrome. Several of these conditions are ductal dependent, with clinical deterioration occurring as the ductus arteriosus closes, particularly in coarctation of the aorta, critical aortic stenosis, critical pulmonic stenosis, and hypoplastic left heart syndrome.
Etiology
In most cases, the underlying cause is unknown. Genetic associations include trisomy 21 with atrioventricular canal defects and Turner syndrome with coarctation of the aorta. Environmental causes include congenital rubella infection, which is associated with patent ductus arteriosus and aortic stenosis.
Clinical Presentation
Many patients are asymptomatic early in life. Symptomatic infants may present with lethargy, poor feeding, failure to thrive, dyspnea with exertion or feeding, and recurrent respiratory infections.
Physical Examination
Ventricular septal defects and atrioventricular canal defects are associated with a dusky appearance, hepatomegaly, holosystolic or diastolic murmurs with thrills, a hyperdynamic precordium, and a displaced point of maximal impulse. Atrial septal defects typically produce a fixed split second heart sound with systolic ejection and diastolic murmurs. Patent ductus arteriosus presents with a continuous “machine-like” murmur and bounding peripheral pulses. Coarctation of the aorta is characterized by differential cyanosis, higher blood pressure in the upper extremities than the lower extremities, and diminished or absent femoral pulses. Aortic stenosis produces a harsh systolic murmur with a thrill and an aortic click. Pulmonic stenosis causes a systolic ejection murmur with a thrill, pulmonic click, widely split second heart sound, and jugular venous A waves. Hypoplastic left heart syndrome presents with a dusky, listless, tachypneic infant, diminished pulses, a single heart sound, and a systolic ejection murmur.
Essential Diagnostic Evaluation
Initial evaluation includes pre- and postductal oxygen saturation measurement, arterial blood gas analysis, complete blood count, basic metabolic panel, glucose testing, and a full sepsis evaluation. Chest radiography is used to assess pulmonary blood flow, while electrocardiography evaluates cardiac axis, chamber hypertrophy, and conduction abnormalities. Four-extremity blood pressure measurements are essential. Early cardiology consultation is required.
Diagnostic Tests And Interpretation
Chest radiography in left-to-right shunting lesions typically demonstrates cardiomegaly with increased pulmonary vascular markings. Chamber enlargement patterns vary by lesion, with atrial septal defects enlarging the right atrium and right ventricle, ventricular septal defects enlarging the right ventricle and left atrium, and patent ductus arteriosus enlarging the left atrium and left ventricle. Atrioventricular canal defects often produce a globular heart with enlargement of all chambers. Obstructive lesions may show a normal cardiac silhouette or cardiomegaly. Electrocardiographic findings vary by lesion and may include right or left axis deviation, ventricular hypertrophy, bundle branch block, prolonged PR interval, or peaked P waves, depending on the specific defect.
Differential Diagnosis
Conditions to consider include congestive heart failure, hypertrophic cardiomyopathy, cardiogenic shock, aortic dissection, myocarditis, bronchopulmonary dysplasia, pulmonary hypertension, pneumonia or bronchiolitis, hypoglycemia, adrenal insufficiency or congenital adrenal hyperplasia, glycogen storage diseases, sepsis, and other causes of shock.
Initial Stabilization And Therapy
Initial management focuses on maintaining warmth and adequate oxygenation, correcting hypoglycemia and metabolic acidosis, establishing intravenous access, and preparing for airway support if needed. Excessively high oxygen concentrations should be avoided, as they promote ductal closure.
Emergency Department Management
Prostaglandin E1 infusion should be initiated to maintain or reopen ductal patency in ductal-dependent lesions, typically at 0.05–0.1 μg/kg/min by continuous intravenous infusion. Potential complications include apnea, bradycardia, hypotension, and seizures. A full septic evaluation with empiric antibiotics should be performed while alternative causes are addressed. Circulatory collapse related to congenital heart disease is treated with cautious fluid resuscitation in 10 mL/kg increments, inotropic support, and aggressive correction of acidosis. Congestive heart failure is managed with diuretics and digoxin when appropriate.
Medications
Commonly used medications include ampicillin, gentamicin, prostaglandin E1, furosemide, digoxin, dopamine, dobutamine, epinephrine, milrinone, and sodium bicarbonate. Digoxin dosing requires extreme caution due to its narrow therapeutic window.
Disposition And Follow-Up
All newborns with suspected congenital heart disease require admission to a pediatric intensive care unit. Admission is also indicated for patients with acute worsening of heart failure, respiratory infection, or hemodynamic instability. Discharge decisions should only be made in conjunction with a pediatric cardiologist.
Referral And Follow-Up Recommendations
Ongoing care should be coordinated by the primary care physician in collaboration with pediatric cardiology and cardiothoracic surgery. Follow-up plans must be individualized based on the specific lesion and clinical course.
Clinical Pearls And Pitfalls
Acyanotic lesions often become symptomatic between 2 and 12 weeks of age as the ductus arteriosus closes or pulmonary vascular resistance decreases. Coarctation commonly presents as ductal closure occurs, while septal defects become apparent as pulmonary resistance falls. A superior QRS axis on ECG is characteristic of atrioventricular canal defects, and rib notching on chest radiography is a late finding in coarctation of the aorta.
- Published on
Emergency And Acute Medicine – Constipation
Description
Constipation is defined clinically using the Rome criteria, which require at least two of the following symptoms for a minimum of three months: straining during more than 25% of bowel movements, hard stools in more than 25% of bowel movements, a sensation of incomplete evacuation in more than 25% of bowel movements, or two or fewer bowel movements per week.
Pediatric Considerations
Defecation disorders account for approximately 3% of pediatric outpatient visits. Children with cerebral palsy are at increased risk of functional constipation. Pediatric constipation may be classified into anatomic causes, colonic neuromuscular disease such as Hirschsprung disease, and defecation disorders including functional constipation and nonretentive fecal soiling. Functional fecal retention is the most common cause and is often related to fear or pain with defecation, leading to irritability, abdominal cramping, decreased appetite, and early satiety.
Etiology
Metabolic and endocrine causes include diabetes, uremia, porphyria, hypothyroidism, hypercalcemia, pheochromocytoma, panhypopituitarism, and pregnancy. Functional and idiopathic causes include irritable bowel syndrome, diverticular disease, colonic inertia, megacolon or megarectum, pelvic intussusception, nonrelaxing puborectalis, rectocele, posthysterectomy syndrome, and descending perineum. Pharmacologic causes include analgesics, antacids, anticholinergics, anticonvulsants, antidepressants, antihypertensives, calcium channel blockers, diuretics, iron supplements, laxative abuse, monoamine oxidase inhibitors, opioids, paralytics, parasympatholytics, phenothiazines, and psychotropic medications. Neurologic causes include Parkinson disease, multiple sclerosis, cerebrovascular accidents, spinal cord injury, Hirschsprung disease, Chagas disease, neurofibromatosis, and autonomic neuropathy. Mechanical obstruction may result from neoplasm, stricture, hernia, or volvulus.
Clinical Features
Constipation represents a symptom rather than a primary diagnosis. Patients may report infrequent bowel movements, passage of hard stools, straining, abdominal distention or bloating, and difficulty with defecation. Liquid stool may pass around impacted feces, presenting as paradoxical diarrhea. Digital rectal examination may reveal firm stool or an empty rectal vault. History should include age at symptom onset, diet, exercise habits, stool characteristics, medication use, prior surgeries, use of laxatives or enemas, and symptoms suggestive of pelvic floor dysfunction. Physical examination may demonstrate abdominal masses from fecal loading and should include a focused rectal examination assessing sphincter tone, relaxation, stool consistency, and the presence of rectocele or cystocele.
Essential Evaluation
A detailed medical, surgical, and psychiatric history with careful physical examination is central to evaluation. The anorectal examination should assess for fissures, stenosis, neoplasm, sphincter tone abnormalities, perineal descent, tenderness, or spasm.
Diagnostic Tests And Interpretation
Laboratory testing is reserved for suspected metabolic or endocrine causes and may include a complete blood count, electrolytes, calcium, and thyroid function tests. Imaging is rarely required unless obstruction or other pathology is suspected. Abdominal radiographs may show fecal loading or colonic dilation. Computed tomography is indicated in elderly patients with abdominal pain or fever to exclude perforation. Contrast enemas may identify diverticulosis, megacolon, megarectum, Hirschsprung disease, or strictures.
Differential Diagnosis
The differential diagnosis includes bowel obstruction and secondary causes listed under etiology.
Initial Management
Intravenous access should be established in patients with significant abdominal pain or dehydration, and intravenous fluids administered as indicated.
Emergency Department Management
Initial treatment focuses on colonic evacuation using enemas, suppositories, or manual disimpaction when necessary. A long-term bowel regimen should be initiated, including increased noncaffeinated fluid intake, increased dietary fiber, regular exercise, stool softeners, and discontinuation or adjustment of constipating medications when possible.
Medications
Rectal therapies include sodium phosphate, mineral oil, and tap water enemas, as well as glycerin suppositories. Fiber supplements such as methylcellulose and psyllium may be used. Osmotic laxatives include lactulose, polyethylene glycol, and magnesium hydroxide. Stimulant laxatives include bisacodyl and senna. Stool softeners include docusate sodium and oral mineral oil.
Disposition And Follow-Up
Hospital admission is indicated for patients with severe abdominal pain, vomiting, bowel obstruction, peritonitis, or those unable to be adequately treated in the emergency department or home setting, particularly elderly or neurologically impaired patients. Patients may be discharged if pain free, adequately relieved of fecal burden, and without comorbid conditions requiring admission.
Follow-Up Recommendations
Primary care or gastroenterology follow-up is recommended for patients with chronic or recurrent constipation.
Practice Points And Common Errors
Patients should be counseled on dietary, fluid, and lifestyle modifications to reduce recurrence. A comprehensive history and physical examination are essential to avoid missing serious medical or surgical causes of constipation. Failure to consider secondary etiologies or medication-related causes is a common source of mismanagement.
Description
Constipation is defined clinically using the Rome criteria, which require at least two of the following symptoms for a minimum of three months: straining during more than 25% of bowel movements, hard stools in more than 25% of bowel movements, a sensation of incomplete evacuation in more than 25% of bowel movements, or two or fewer bowel movements per week.
Pediatric Considerations
Defecation disorders account for approximately 3% of pediatric outpatient visits. Children with cerebral palsy are at increased risk of functional constipation. Pediatric constipation may be classified into anatomic causes, colonic neuromuscular disease such as Hirschsprung disease, and defecation disorders including functional constipation and nonretentive fecal soiling. Functional fecal retention is the most common cause and is often related to fear or pain with defecation, leading to irritability, abdominal cramping, decreased appetite, and early satiety.
Etiology
Metabolic and endocrine causes include diabetes, uremia, porphyria, hypothyroidism, hypercalcemia, pheochromocytoma, panhypopituitarism, and pregnancy. Functional and idiopathic causes include irritable bowel syndrome, diverticular disease, colonic inertia, megacolon or megarectum, pelvic intussusception, nonrelaxing puborectalis, rectocele, posthysterectomy syndrome, and descending perineum. Pharmacologic causes include analgesics, antacids, anticholinergics, anticonvulsants, antidepressants, antihypertensives, calcium channel blockers, diuretics, iron supplements, laxative abuse, monoamine oxidase inhibitors, opioids, paralytics, parasympatholytics, phenothiazines, and psychotropic medications. Neurologic causes include Parkinson disease, multiple sclerosis, cerebrovascular accidents, spinal cord injury, Hirschsprung disease, Chagas disease, neurofibromatosis, and autonomic neuropathy. Mechanical obstruction may result from neoplasm, stricture, hernia, or volvulus.
Clinical Features
Constipation represents a symptom rather than a primary diagnosis. Patients may report infrequent bowel movements, passage of hard stools, straining, abdominal distention or bloating, and difficulty with defecation. Liquid stool may pass around impacted feces, presenting as paradoxical diarrhea. Digital rectal examination may reveal firm stool or an empty rectal vault. History should include age at symptom onset, diet, exercise habits, stool characteristics, medication use, prior surgeries, use of laxatives or enemas, and symptoms suggestive of pelvic floor dysfunction. Physical examination may demonstrate abdominal masses from fecal loading and should include a focused rectal examination assessing sphincter tone, relaxation, stool consistency, and the presence of rectocele or cystocele.
Essential Evaluation
A detailed medical, surgical, and psychiatric history with careful physical examination is central to evaluation. The anorectal examination should assess for fissures, stenosis, neoplasm, sphincter tone abnormalities, perineal descent, tenderness, or spasm.
Diagnostic Tests And Interpretation
Laboratory testing is reserved for suspected metabolic or endocrine causes and may include a complete blood count, electrolytes, calcium, and thyroid function tests. Imaging is rarely required unless obstruction or other pathology is suspected. Abdominal radiographs may show fecal loading or colonic dilation. Computed tomography is indicated in elderly patients with abdominal pain or fever to exclude perforation. Contrast enemas may identify diverticulosis, megacolon, megarectum, Hirschsprung disease, or strictures.
Differential Diagnosis
The differential diagnosis includes bowel obstruction and secondary causes listed under etiology.
Initial Management
Intravenous access should be established in patients with significant abdominal pain or dehydration, and intravenous fluids administered as indicated.
Emergency Department Management
Initial treatment focuses on colonic evacuation using enemas, suppositories, or manual disimpaction when necessary. A long-term bowel regimen should be initiated, including increased noncaffeinated fluid intake, increased dietary fiber, regular exercise, stool softeners, and discontinuation or adjustment of constipating medications when possible.
Medications
Rectal therapies include sodium phosphate, mineral oil, and tap water enemas, as well as glycerin suppositories. Fiber supplements such as methylcellulose and psyllium may be used. Osmotic laxatives include lactulose, polyethylene glycol, and magnesium hydroxide. Stimulant laxatives include bisacodyl and senna. Stool softeners include docusate sodium and oral mineral oil.
Disposition And Follow-Up
Hospital admission is indicated for patients with severe abdominal pain, vomiting, bowel obstruction, peritonitis, or those unable to be adequately treated in the emergency department or home setting, particularly elderly or neurologically impaired patients. Patients may be discharged if pain free, adequately relieved of fecal burden, and without comorbid conditions requiring admission.
Follow-Up Recommendations
Primary care or gastroenterology follow-up is recommended for patients with chronic or recurrent constipation.
Practice Points And Common Errors
Patients should be counseled on dietary, fluid, and lifestyle modifications to reduce recurrence. A comprehensive history and physical examination are essential to avoid missing serious medical or surgical causes of constipation. Failure to consider secondary etiologies or medication-related causes is a common source of mismanagement.
- Published on
Emergency And Acute Medicine – Conjunctivitis
Description
Conjunctivitis is inflammation of the conjunctiva caused by a wide range of infectious and noninfectious etiologies. It is commonly referred to as “pink eye” and is a frequent reason for emergency and primary care visits.
Etiology
Bacterial causes include Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. Gonococcal conjunctivitis is an ophthalmic emergency because of rapid corneal invasion and risk of blindness. Chlamydial conjunctivitis occurs through autoinoculation from genital secretions and is common in newborns. Viral conjunctivitis is most often due to adenovirus, including epidemic keratoconjunctivitis, and is frequently associated with upper respiratory infections. Herpes simplex virus may cause recurrent ocular disease, and corticosteroids are contraindicated. Allergic conjunctivitis is associated with atopy and nasal symptoms. Contact-related conjunctivitis may result from chemical irritation or hypersensitivity, with Pseudomonas species commonly implicated in contact lens users.
Clinical Features
Patients typically present with red eye, burning or gritty sensation, foreign body sensation, discharge, eyelid sticking on awakening, chemosis, eyelid edema, tearing, and itching. Bacterial conjunctivitis produces mucopurulent discharge. Gonococcal infection causes hyperacute, copious purulent discharge within 12 hours, severe chemosis, and eyelid swelling. Chlamydial conjunctivitis presents with lacrimation, mucopurulent discharge, photophobia, and frequent concomitant genital infection. Viral conjunctivitis often causes watery discharge, preauricular lymphadenopathy, and spreads to the other eye within 24–48 hours. Epidemic keratoconjunctivitis may reduce vision due to corneal infiltrates. Allergic conjunctivitis is marked by intense itching and watery discharge. Contact-related disease may present acutely with corneal ulceration but normal visual acuity and intraocular pressure.
Essential Evaluation
History should assess onset, exposures, sick contacts, sexual history, medication or cosmetic use, and systemic disease. A careful eye examination including slit-lamp evaluation and fluorescein staining is essential.
Diagnostic Tests And Interpretation
Routine cultures are not required in uncomplicated cases. Indications for bacteriologic studies include ophthalmia neonatorum, suspected gonococcal infection, immunocompromised patients, systemic illness, or lack of improvement within 48–72 hours. Identification of gram-negative intracellular diplococci on Gram stain is sufficient to initiate gonococcal therapy. Serologic testing such as rapid plasma reagin may be indicated when sexually transmitted infection is suspected.
Differential Diagnosis
Conditions to exclude include acute angle-closure glaucoma, anterior uveitis, keratitis, corneal abrasion, foreign body, dry eye, scleritis, episcleritis, nasolacrimal obstruction, and subconjunctival hemorrhage.
Initial Management
Empiric treatment with broad-spectrum topical antibiotics is appropriate for most suspected bacterial cases. Systemic therapy is mandatory for gonococcal, chlamydial, meningococcal infections, ophthalmia neonatorum, and severe disease. Herpetic infections require ophthalmology consultation.
Emergency Department Management
Discharge should be gently cleaned from the eye, and contact lens wearers must discontinue lens use and discard contaminated lenses. Emphasize hand hygiene and avoidance of shared towels or cosmetics. Warm soaks help remove debris. Bacterial conjunctivitis is treated with topical antibiotics continued for 48 hours after symptom resolution. Failure to improve within 48–72 hours warrants culture and reevaluation. Viral conjunctivitis requires supportive care only. Allergic conjunctivitis is treated with antihistamine or mast cell stabilizer drops, artificial tears, and avoidance of triggers. Noninfectious irritation is managed with lubricating drops or ointments.
Medications
All contact lens wearers require antipseudomonal coverage. Common topical agents include ciprofloxacin, gentamicin, tobramycin, erythromycin, and sulfacetamide. Chlamydial infection requires systemic therapy with doxycycline or erythromycin. Gonococcal conjunctivitis requires parenteral ceftriaxone plus topical antibiotics. Viral conjunctivitis is managed with artificial tears and topical antihistamines. Herpetic disease is treated with antiviral ophthalmic agents. Allergic conjunctivitis responds to antihistamine, mast cell stabilizer, or NSAID drops.
Pediatric Considerations
In neonates, conjunctivitis often reflects systemic infection acquired during birth. Chemical conjunctivitis occurs within the first 36 hours of life. Ophthalmia neonatorum occurs within the first four weeks and is commonly caused by gonococcal, chlamydial, or herpetic infection. Ointments are preferred over drops in infants.
Disposition And Follow-Up
Hospital admission is required for known or suspected gonococcal infection at any age. Most patients can be discharged with close follow-up.
Follow-Up Recommendations
Ophthalmology follow-up is recommended for all bacterial conjunctivitis cases and is mandatory for epidemic keratoconjunctivitis or severe disease.
Key Clinical Insights And Common Errors
Conjunctivitis is highly contagious, particularly viral forms and epidemic keratoconjunctivitis, which may remain transmissible for up to two weeks. Strict hand hygiene and meticulous disinfection of examination equipment are essential to prevent spread. Corticosteroids should be used with extreme caution, as they can exacerbate unrecognized herpes simplex infection and worsen outcomes.
Description
Conjunctivitis is inflammation of the conjunctiva caused by a wide range of infectious and noninfectious etiologies. It is commonly referred to as “pink eye” and is a frequent reason for emergency and primary care visits.
Etiology
Bacterial causes include Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. Gonococcal conjunctivitis is an ophthalmic emergency because of rapid corneal invasion and risk of blindness. Chlamydial conjunctivitis occurs through autoinoculation from genital secretions and is common in newborns. Viral conjunctivitis is most often due to adenovirus, including epidemic keratoconjunctivitis, and is frequently associated with upper respiratory infections. Herpes simplex virus may cause recurrent ocular disease, and corticosteroids are contraindicated. Allergic conjunctivitis is associated with atopy and nasal symptoms. Contact-related conjunctivitis may result from chemical irritation or hypersensitivity, with Pseudomonas species commonly implicated in contact lens users.
Clinical Features
Patients typically present with red eye, burning or gritty sensation, foreign body sensation, discharge, eyelid sticking on awakening, chemosis, eyelid edema, tearing, and itching. Bacterial conjunctivitis produces mucopurulent discharge. Gonococcal infection causes hyperacute, copious purulent discharge within 12 hours, severe chemosis, and eyelid swelling. Chlamydial conjunctivitis presents with lacrimation, mucopurulent discharge, photophobia, and frequent concomitant genital infection. Viral conjunctivitis often causes watery discharge, preauricular lymphadenopathy, and spreads to the other eye within 24–48 hours. Epidemic keratoconjunctivitis may reduce vision due to corneal infiltrates. Allergic conjunctivitis is marked by intense itching and watery discharge. Contact-related disease may present acutely with corneal ulceration but normal visual acuity and intraocular pressure.
Essential Evaluation
History should assess onset, exposures, sick contacts, sexual history, medication or cosmetic use, and systemic disease. A careful eye examination including slit-lamp evaluation and fluorescein staining is essential.
Diagnostic Tests And Interpretation
Routine cultures are not required in uncomplicated cases. Indications for bacteriologic studies include ophthalmia neonatorum, suspected gonococcal infection, immunocompromised patients, systemic illness, or lack of improvement within 48–72 hours. Identification of gram-negative intracellular diplococci on Gram stain is sufficient to initiate gonococcal therapy. Serologic testing such as rapid plasma reagin may be indicated when sexually transmitted infection is suspected.
Differential Diagnosis
Conditions to exclude include acute angle-closure glaucoma, anterior uveitis, keratitis, corneal abrasion, foreign body, dry eye, scleritis, episcleritis, nasolacrimal obstruction, and subconjunctival hemorrhage.
Initial Management
Empiric treatment with broad-spectrum topical antibiotics is appropriate for most suspected bacterial cases. Systemic therapy is mandatory for gonococcal, chlamydial, meningococcal infections, ophthalmia neonatorum, and severe disease. Herpetic infections require ophthalmology consultation.
Emergency Department Management
Discharge should be gently cleaned from the eye, and contact lens wearers must discontinue lens use and discard contaminated lenses. Emphasize hand hygiene and avoidance of shared towels or cosmetics. Warm soaks help remove debris. Bacterial conjunctivitis is treated with topical antibiotics continued for 48 hours after symptom resolution. Failure to improve within 48–72 hours warrants culture and reevaluation. Viral conjunctivitis requires supportive care only. Allergic conjunctivitis is treated with antihistamine or mast cell stabilizer drops, artificial tears, and avoidance of triggers. Noninfectious irritation is managed with lubricating drops or ointments.
Medications
All contact lens wearers require antipseudomonal coverage. Common topical agents include ciprofloxacin, gentamicin, tobramycin, erythromycin, and sulfacetamide. Chlamydial infection requires systemic therapy with doxycycline or erythromycin. Gonococcal conjunctivitis requires parenteral ceftriaxone plus topical antibiotics. Viral conjunctivitis is managed with artificial tears and topical antihistamines. Herpetic disease is treated with antiviral ophthalmic agents. Allergic conjunctivitis responds to antihistamine, mast cell stabilizer, or NSAID drops.
Pediatric Considerations
In neonates, conjunctivitis often reflects systemic infection acquired during birth. Chemical conjunctivitis occurs within the first 36 hours of life. Ophthalmia neonatorum occurs within the first four weeks and is commonly caused by gonococcal, chlamydial, or herpetic infection. Ointments are preferred over drops in infants.
Disposition And Follow-Up
Hospital admission is required for known or suspected gonococcal infection at any age. Most patients can be discharged with close follow-up.
Follow-Up Recommendations
Ophthalmology follow-up is recommended for all bacterial conjunctivitis cases and is mandatory for epidemic keratoconjunctivitis or severe disease.
Key Clinical Insights And Common Errors
Conjunctivitis is highly contagious, particularly viral forms and epidemic keratoconjunctivitis, which may remain transmissible for up to two weeks. Strict hand hygiene and meticulous disinfection of examination equipment are essential to prevent spread. Corticosteroids should be used with extreme caution, as they can exacerbate unrecognized herpes simplex infection and worsen outcomes.
