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Emergency And Acute Medicine – Penetrating Head Injury
Definition And Injury Characteristics
Penetrating head trauma involves direct violation of the skull with injury to intracranial contents. High-velocity injuries are most commonly caused by bullets and produce direct tissue destruction along with secondary cavitation or shock-wave injury to surrounding brain tissue. Low-velocity injuries are typically due to knives, picks, or other sharp objects and cause localized, direct damage to brain structures along the tract of penetration.
Mechanisms Of Injury
Penetration of the skull by a foreign object leads to direct brain tissue injury and is frequently complicated by intracranial hemorrhage, including epidural, subdural, and intraparenchymal bleeding. Even when a projectile strikes the skull and ricochets without fracturing bone, significant underlying brain injury may still occur due to transmitted force.
Clinical Presentation
The degree of altered consciousness and neurologic deficit varies widely depending on the object involved, its velocity, and the anatomic location of injury. Signs of rising intracranial pressure include declining level of consciousness, decreasing Glasgow Coma Scale score, Cushing response with bradycardia, hypertension, and abnormal respirations, as well as a dilated or “blown” pupil accompanied by decorticate or decerebrate posturing.
External indicators of penetrating injury or basilar skull fracture may include raccoon eyes, Battle sign over the mastoid, hemotympanum, and cerebrospinal fluid rhinorrhea or otorrhea. Retained foreign objects may still be present at the injury site.
History Assessment
Key historical elements include identification of the weapon or object involved, weapon caliber when applicable, loss of consciousness or amnesia, anticoagulant use, headache, visual or auditory disturbances, and focal neurologic complaints.
Physical Examination
Examination should focus on identifying entry and exit wounds, evaluating for multiple projectile sites, and performing a complete neurologic assessment. Mental status and focal findings correlate closely with injury location and severity.
Essential Evaluation
A thorough history and physical examination are required to assess the extent of injury, followed by urgent imaging to define intracranial damage and guide management.
Diagnostic Testing
Laboratory studies include complete blood count, platelet count, coagulation profile, type and crossmatch, and baseline electrolytes, blood urea nitrogen, and creatinine.
Imaging is centered on noncontrast CT of the head to identify hemorrhage, foreign bodies, bone fragments, and injury trajectory. Skull radiographs may assist in determining depth of penetration and retained fragments. Cervical spine imaging with helical CT or standard radiographs is required when indicated.
Alternative Diagnoses
Conditions to consider include blunt head trauma, isolated basilar skull fracture, or medical causes of altered mental status that may have resulted in secondary penetrating injury after a fall.
Prehospital Management Principles
Stabilization is prioritized while avoiding removal of any retained foreign object. Airway protection is essential to prevent hypoxemia, while routine hyperventilation should be avoided. Cervical spine precautions must be maintained. Patients should be transported to a trauma center. Hypoxia is prevented with supplemental oxygen, and hypotension is avoided using intravenous crystalloid fluids to maintain systolic blood pressure above 90 mm Hg.
Initial Emergency Department Stabilization
Management focuses on airway, breathing, and circulation. Rapid sequence intubation is indicated for Glasgow Coma Scale score below 8, inability to protect the airway, hypoxia, or signs of cerebral herniation. Induction agents may include etomidate or fentanyl with caution in hemodynamically unstable patients, followed by neuromuscular blockade. Carbon dioxide levels should be normalized, avoiding both hyperventilation and hypoventilation. Adequate intravenous access and fluid resuscitation are required, and associated traumatic injuries must be addressed. Cervical spine precautions continue throughout resuscitation.
Emergency Department Management
Immediate neurosurgical consultation is mandatory. In patients with signs of cerebral herniation, intracranial pressure reduction measures include mild hyperventilation targeting end-tidal CO₂ of 30–35 mm Hg, head elevation to 20–30 degrees, and cautious use of mannitol only if systolic blood pressure exceeds 100 mm Hg and volume status is adequate. Phenytoin is administered to prevent early post-traumatic seizures. Coagulopathies must be rapidly reversed. Glucocorticoids and barbiturates are not recommended for intracranial pressure control in penetrating head injury.
Blood transfusion may be required to maintain hematocrit above 30 percent. Hypothermia should be avoided due to increased risk of coagulopathy. Patients remain NPO. Definitive surgical management is based on clinical findings, imaging, and neurosurgical judgment. In rare cases without immediate neurosurgical access, a life-saving burr hole may be considered in comatose patients with known mass lesions and refractory herniation signs.
Medications Commonly Used
Medications include etomidate for induction, fentanyl for analgesia when hemodynamically stable, mannitol for intracranial pressure reduction, morphine for pain control, phenytoin for seizure prophylaxis, neuromuscular blockers such as succinylcholine, rocuronium, or vecuronium, vitamin K for warfarin reversal, and protamine sulfate for low–molecular-weight heparin–associated bleeding.
Disposition And Follow-Up
All patients with penetrating head trauma require ICU admission or immediate operative intervention. Discharge from the emergency department is not appropriate.
Key Clinical Lessons And Errors To Avoid
Common errors include failure to identify anticoagulant use, delayed or inadequate imaging, and insufficient reversal of hypocoagulable states. Prompt recognition and aggressive management are essential to reduce morbidity and mortality.
Definition And Injury Characteristics
Penetrating head trauma involves direct violation of the skull with injury to intracranial contents. High-velocity injuries are most commonly caused by bullets and produce direct tissue destruction along with secondary cavitation or shock-wave injury to surrounding brain tissue. Low-velocity injuries are typically due to knives, picks, or other sharp objects and cause localized, direct damage to brain structures along the tract of penetration.
Mechanisms Of Injury
Penetration of the skull by a foreign object leads to direct brain tissue injury and is frequently complicated by intracranial hemorrhage, including epidural, subdural, and intraparenchymal bleeding. Even when a projectile strikes the skull and ricochets without fracturing bone, significant underlying brain injury may still occur due to transmitted force.
Clinical Presentation
The degree of altered consciousness and neurologic deficit varies widely depending on the object involved, its velocity, and the anatomic location of injury. Signs of rising intracranial pressure include declining level of consciousness, decreasing Glasgow Coma Scale score, Cushing response with bradycardia, hypertension, and abnormal respirations, as well as a dilated or “blown” pupil accompanied by decorticate or decerebrate posturing.
External indicators of penetrating injury or basilar skull fracture may include raccoon eyes, Battle sign over the mastoid, hemotympanum, and cerebrospinal fluid rhinorrhea or otorrhea. Retained foreign objects may still be present at the injury site.
History Assessment
Key historical elements include identification of the weapon or object involved, weapon caliber when applicable, loss of consciousness or amnesia, anticoagulant use, headache, visual or auditory disturbances, and focal neurologic complaints.
Physical Examination
Examination should focus on identifying entry and exit wounds, evaluating for multiple projectile sites, and performing a complete neurologic assessment. Mental status and focal findings correlate closely with injury location and severity.
Essential Evaluation
A thorough history and physical examination are required to assess the extent of injury, followed by urgent imaging to define intracranial damage and guide management.
Diagnostic Testing
Laboratory studies include complete blood count, platelet count, coagulation profile, type and crossmatch, and baseline electrolytes, blood urea nitrogen, and creatinine.
Imaging is centered on noncontrast CT of the head to identify hemorrhage, foreign bodies, bone fragments, and injury trajectory. Skull radiographs may assist in determining depth of penetration and retained fragments. Cervical spine imaging with helical CT or standard radiographs is required when indicated.
Alternative Diagnoses
Conditions to consider include blunt head trauma, isolated basilar skull fracture, or medical causes of altered mental status that may have resulted in secondary penetrating injury after a fall.
Prehospital Management Principles
Stabilization is prioritized while avoiding removal of any retained foreign object. Airway protection is essential to prevent hypoxemia, while routine hyperventilation should be avoided. Cervical spine precautions must be maintained. Patients should be transported to a trauma center. Hypoxia is prevented with supplemental oxygen, and hypotension is avoided using intravenous crystalloid fluids to maintain systolic blood pressure above 90 mm Hg.
Initial Emergency Department Stabilization
Management focuses on airway, breathing, and circulation. Rapid sequence intubation is indicated for Glasgow Coma Scale score below 8, inability to protect the airway, hypoxia, or signs of cerebral herniation. Induction agents may include etomidate or fentanyl with caution in hemodynamically unstable patients, followed by neuromuscular blockade. Carbon dioxide levels should be normalized, avoiding both hyperventilation and hypoventilation. Adequate intravenous access and fluid resuscitation are required, and associated traumatic injuries must be addressed. Cervical spine precautions continue throughout resuscitation.
Emergency Department Management
Immediate neurosurgical consultation is mandatory. In patients with signs of cerebral herniation, intracranial pressure reduction measures include mild hyperventilation targeting end-tidal CO₂ of 30–35 mm Hg, head elevation to 20–30 degrees, and cautious use of mannitol only if systolic blood pressure exceeds 100 mm Hg and volume status is adequate. Phenytoin is administered to prevent early post-traumatic seizures. Coagulopathies must be rapidly reversed. Glucocorticoids and barbiturates are not recommended for intracranial pressure control in penetrating head injury.
Blood transfusion may be required to maintain hematocrit above 30 percent. Hypothermia should be avoided due to increased risk of coagulopathy. Patients remain NPO. Definitive surgical management is based on clinical findings, imaging, and neurosurgical judgment. In rare cases without immediate neurosurgical access, a life-saving burr hole may be considered in comatose patients with known mass lesions and refractory herniation signs.
Medications Commonly Used
Medications include etomidate for induction, fentanyl for analgesia when hemodynamically stable, mannitol for intracranial pressure reduction, morphine for pain control, phenytoin for seizure prophylaxis, neuromuscular blockers such as succinylcholine, rocuronium, or vecuronium, vitamin K for warfarin reversal, and protamine sulfate for low–molecular-weight heparin–associated bleeding.
Disposition And Follow-Up
All patients with penetrating head trauma require ICU admission or immediate operative intervention. Discharge from the emergency department is not appropriate.
Key Clinical Lessons And Errors To Avoid
Common errors include failure to identify anticoagulant use, delayed or inadequate imaging, and insufficient reversal of hypocoagulable states. Prompt recognition and aggressive management are essential to reduce morbidity and mortality.
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Emergency And Acute Medicine – Hazardous Materials Exposure
Overview And Definition
Hazardous materials exposure refers to contact with chemical substances that cause local or systemic toxicity. Injury mechanisms depend on the chemical involved. Acids typically cause coagulation necrosis with eschar formation, which often limits deep tissue penetration. Alkalis cause liquefaction necrosis, forming soluble complexes that penetrate deeply into tissues. Additional mechanisms of injury include oxidation, protein denaturation, cellular dehydration, local ischemia, and metabolic inhibition or competition.
Causes And Sources Of Exposure
Hazardous materials may be encountered in household settings, industrial environments, agriculture, transportation accidents, and during criminal or terrorist activities. Toxicity varies according to the specific substance involved and its chemical properties.
Clinical Manifestations
Cutaneous exposure may result in chemical burns that can appear deceptively mild initially. Visible liquid or powder may be present on the skin, and dermal absorption can lead to systemic toxicity.
Mucous membrane involvement, including the eyes and nasopharynx, ranges from mild irritation to severe burns and may threaten the airway.
Pulmonary exposure may cause cough, pleuritic chest pain, bronchospasm, dyspnea, and pulmonary edema, which may occur immediately or be delayed.
Systemic toxicity following skin or inhalational absorption can include altered mental status, seizures, tachyarrhythmias or bradyarrhythmias, hypotension or hypertension, gastrointestinal symptoms, electrolyte disturbances, carboxyhemoglobinemia, methemoglobinemia, cyanide poisoning, and cholinergic toxidrome.
History Assessment
History should focus on identifying the type of substance, circumstances of exposure, route, and duration.
Essential Evaluation
Identification of the hazardous substance should be attempted using information from prehospital providers, Material Safety Data Sheets (MSDS), and the Chemical Transportation Emergency Center (Chemtrec). MSDS documents identify the chemical, distinguish vapor versus dermal hazards, determine decontamination needs, and provide limited treatment guidance. Route and duration of exposure must be clarified, with particular concern for inhalation injuries in enclosed spaces. Toxicity assessment should involve poison control, computerized databases such as POISINDEX or TOXNET, or standard toxicology references. Patients should be observed as indicated for delayed systemic effects.
Diagnostic Studies And Interpretation
Laboratory testing depends on the suspected substance and may include electrolytes, blood urea nitrogen, creatinine, glucose, liver function tests, calcium, magnesium, phosphorus, and arterial blood gases to assess metabolic acidosis or respiratory failure. Testing for carboxyhemoglobinemia and methemoglobinemia may be required. Chest radiography is indicated when pulmonary edema is suspected.
Conditions To Consider
Dermatologic differentials include hypersensitivity reactions and thermal burns. Pulmonary considerations include pneumonia, pulmonary embolism, and anaphylaxis. Systemic differentials include status epilepticus, drug overdose, psychiatric illness, and myocardial infarction.
Prehospital Management
A hazardous materials situation should be suspected in industrial or agricultural accidents, transportation incidents involving chemicals, suspected terrorist events, cholinergic syndromes, mucous membrane irritation, or chemical burns. Rescuers must protect themselves by approaching from upwind and avoiding entry until safety is confirmed. Level A protective gear is required when safety is uncertain. Ambulatory patients who can walk and talk are usually minimally contaminated. Personal protective equipment levels range from fully encapsulated Level A suits with self-contained breathing apparatus to basic Level D work clothing. Substance identification may involve Department of Transportation placards, shipping papers, MSDS, or consultation with Chemtrec. Decontamination should be performed by trained teams, and supportive care is generally limited to basic life support in the hot zone. Immediate irrigation of skin and eye exposures should begin on scene and continue until hospital arrival.
Initial Emergency Department Stabilization
Emergency department personnel must be protected from secondary contamination via dermal contact or inhalation. Patients should remain outside designated hot zones until decontaminated. When uncertain, decontamination should proceed. If urgent care is required prior to decontamination, the number of staff should be minimized and appropriate protective equipment used, focusing only on life- and limb-saving interventions.
Decontamination Procedures
Security should enforce hot zone boundaries. All clothing, including contact lenses, should be removed, labeled, and double-bagged. Copious irrigation with soap and water for 10–15 minutes is required, paying close attention to wounds and exposed eyes. Water should ideally be captured to prevent environmental contamination, though sewer drainage is acceptable during mass casualty events. Hydrotherapy is the cornerstone of chemical burn management and is contraindicated only for elemental metals such as sodium and potassium. Patients may self-decontaminate when appropriate, while children, dependent elderly individuals, and those with disabilities require assistance. Gloves, masks, goggles, and disposable gowns offer partial protection. All medical adjuncts must be removed and replaced, followed by retriage after decontamination.
Emergency Department Treatment
Supportive care is the mainstay of treatment. Antidotal therapy should be administered when indicated and available. Hazmat incidents often provoke mass fear and psychogenic symptoms, and understanding the toxicologic profile helps exclude true exposure. Emergency department staff may develop symptoms at subtoxic concentrations and should be moved to fresh air if affected.
Chemical burns require immediate and prolonged irrigation, particularly with strong alkalis, which may necessitate hours of flushing. Fluid resuscitation follows burn protocols using lactated Ringer solution based on total body surface area. Pain control is essential. Pulmonary symptoms are treated with bronchodilators, oxygen, and ventilatory support as needed.
Specific treatments include calcium gluconate for hydrofluoric acid burns, systemic calcium and magnesium for toxicity, polyethylene glycol or isopropyl alcohol for phenol burns, methylene blue for nitrate-induced methemoglobinemia, oil coverage for elemental metal exposure, hydroxocobalamin for cyanide poisoning, and appropriate therapy for organophosphate or carbamate insecticide exposure.
Medications
Common medications include nebulized albuterol, topical or intravenous calcium gluconate, intravenous magnesium, methylene blue for methemoglobinemia, and hydroxocobalamin for cyanide toxicity.
Disposition And Follow-Up
Admission is required for airway compromise, respiratory distress, hypoxia, or significant systemic toxicity. Patients with chemical burns should be transferred to a burn center. Discharge is appropriate for asymptomatic patients after observation and poison control consultation or for superficial burns from weak acids or alkalis without systemic risk. Psychiatric or social work referral is recommended for victims of chemical terrorism.
Clinical Pearls And Pitfalls
Stable patients should be decontaminated at the scene whenever possible. Protection of prehospital and emergency department personnel with appropriate protective equipment is critical. Specific antidotes should be administered when indicated. Patients who are ambulatory and coherent are typically minimally contaminated.
Overview And Definition
Hazardous materials exposure refers to contact with chemical substances that cause local or systemic toxicity. Injury mechanisms depend on the chemical involved. Acids typically cause coagulation necrosis with eschar formation, which often limits deep tissue penetration. Alkalis cause liquefaction necrosis, forming soluble complexes that penetrate deeply into tissues. Additional mechanisms of injury include oxidation, protein denaturation, cellular dehydration, local ischemia, and metabolic inhibition or competition.
Causes And Sources Of Exposure
Hazardous materials may be encountered in household settings, industrial environments, agriculture, transportation accidents, and during criminal or terrorist activities. Toxicity varies according to the specific substance involved and its chemical properties.
Clinical Manifestations
Cutaneous exposure may result in chemical burns that can appear deceptively mild initially. Visible liquid or powder may be present on the skin, and dermal absorption can lead to systemic toxicity.
Mucous membrane involvement, including the eyes and nasopharynx, ranges from mild irritation to severe burns and may threaten the airway.
Pulmonary exposure may cause cough, pleuritic chest pain, bronchospasm, dyspnea, and pulmonary edema, which may occur immediately or be delayed.
Systemic toxicity following skin or inhalational absorption can include altered mental status, seizures, tachyarrhythmias or bradyarrhythmias, hypotension or hypertension, gastrointestinal symptoms, electrolyte disturbances, carboxyhemoglobinemia, methemoglobinemia, cyanide poisoning, and cholinergic toxidrome.
History Assessment
History should focus on identifying the type of substance, circumstances of exposure, route, and duration.
Essential Evaluation
Identification of the hazardous substance should be attempted using information from prehospital providers, Material Safety Data Sheets (MSDS), and the Chemical Transportation Emergency Center (Chemtrec). MSDS documents identify the chemical, distinguish vapor versus dermal hazards, determine decontamination needs, and provide limited treatment guidance. Route and duration of exposure must be clarified, with particular concern for inhalation injuries in enclosed spaces. Toxicity assessment should involve poison control, computerized databases such as POISINDEX or TOXNET, or standard toxicology references. Patients should be observed as indicated for delayed systemic effects.
Diagnostic Studies And Interpretation
Laboratory testing depends on the suspected substance and may include electrolytes, blood urea nitrogen, creatinine, glucose, liver function tests, calcium, magnesium, phosphorus, and arterial blood gases to assess metabolic acidosis or respiratory failure. Testing for carboxyhemoglobinemia and methemoglobinemia may be required. Chest radiography is indicated when pulmonary edema is suspected.
Conditions To Consider
Dermatologic differentials include hypersensitivity reactions and thermal burns. Pulmonary considerations include pneumonia, pulmonary embolism, and anaphylaxis. Systemic differentials include status epilepticus, drug overdose, psychiatric illness, and myocardial infarction.
Prehospital Management
A hazardous materials situation should be suspected in industrial or agricultural accidents, transportation incidents involving chemicals, suspected terrorist events, cholinergic syndromes, mucous membrane irritation, or chemical burns. Rescuers must protect themselves by approaching from upwind and avoiding entry until safety is confirmed. Level A protective gear is required when safety is uncertain. Ambulatory patients who can walk and talk are usually minimally contaminated. Personal protective equipment levels range from fully encapsulated Level A suits with self-contained breathing apparatus to basic Level D work clothing. Substance identification may involve Department of Transportation placards, shipping papers, MSDS, or consultation with Chemtrec. Decontamination should be performed by trained teams, and supportive care is generally limited to basic life support in the hot zone. Immediate irrigation of skin and eye exposures should begin on scene and continue until hospital arrival.
Initial Emergency Department Stabilization
Emergency department personnel must be protected from secondary contamination via dermal contact or inhalation. Patients should remain outside designated hot zones until decontaminated. When uncertain, decontamination should proceed. If urgent care is required prior to decontamination, the number of staff should be minimized and appropriate protective equipment used, focusing only on life- and limb-saving interventions.
Decontamination Procedures
Security should enforce hot zone boundaries. All clothing, including contact lenses, should be removed, labeled, and double-bagged. Copious irrigation with soap and water for 10–15 minutes is required, paying close attention to wounds and exposed eyes. Water should ideally be captured to prevent environmental contamination, though sewer drainage is acceptable during mass casualty events. Hydrotherapy is the cornerstone of chemical burn management and is contraindicated only for elemental metals such as sodium and potassium. Patients may self-decontaminate when appropriate, while children, dependent elderly individuals, and those with disabilities require assistance. Gloves, masks, goggles, and disposable gowns offer partial protection. All medical adjuncts must be removed and replaced, followed by retriage after decontamination.
Emergency Department Treatment
Supportive care is the mainstay of treatment. Antidotal therapy should be administered when indicated and available. Hazmat incidents often provoke mass fear and psychogenic symptoms, and understanding the toxicologic profile helps exclude true exposure. Emergency department staff may develop symptoms at subtoxic concentrations and should be moved to fresh air if affected.
Chemical burns require immediate and prolonged irrigation, particularly with strong alkalis, which may necessitate hours of flushing. Fluid resuscitation follows burn protocols using lactated Ringer solution based on total body surface area. Pain control is essential. Pulmonary symptoms are treated with bronchodilators, oxygen, and ventilatory support as needed.
Specific treatments include calcium gluconate for hydrofluoric acid burns, systemic calcium and magnesium for toxicity, polyethylene glycol or isopropyl alcohol for phenol burns, methylene blue for nitrate-induced methemoglobinemia, oil coverage for elemental metal exposure, hydroxocobalamin for cyanide poisoning, and appropriate therapy for organophosphate or carbamate insecticide exposure.
Medications
Common medications include nebulized albuterol, topical or intravenous calcium gluconate, intravenous magnesium, methylene blue for methemoglobinemia, and hydroxocobalamin for cyanide toxicity.
Disposition And Follow-Up
Admission is required for airway compromise, respiratory distress, hypoxia, or significant systemic toxicity. Patients with chemical burns should be transferred to a burn center. Discharge is appropriate for asymptomatic patients after observation and poison control consultation or for superficial burns from weak acids or alkalis without systemic risk. Psychiatric or social work referral is recommended for victims of chemical terrorism.
Clinical Pearls And Pitfalls
Stable patients should be decontaminated at the scene whenever possible. Protection of prehospital and emergency department personnel with appropriate protective equipment is critical. Specific antidotes should be administered when indicated. Patients who are ambulatory and coherent are typically minimally contaminated.
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Emergency And Acute Medicine – Hallucinogen Poisoning
Core Concept
Hallucinogen poisoning refers to toxic exposure to substances that predominantly alter perception, cognition, and mood. These agents act by potentiating neurotransmitter release or binding directly to central nervous system receptors. The serotonergic system (5-hydroxytryptamine, 5-HT) is most commonly involved, with many hallucinogens acting as agonists or antagonists at 5-HT receptor subtypes. Additional pathways affected include norepinephrine, N-methyl-D-aspartate (NMDA), and dopamine systems.
Cause And Exposure Patterns
Most hallucinogen exposures are intentional. Common agents include indoleamines such as lysergic acid diethylamide (LSD), with effects lasting 6–12 hours, and morning glory (Ipomoea species). Tryptamines include psilocybin from Psilocybe mushrooms, which are frequently adulterated with LSD, as well as N,N-dimethyltryptamine (DMT), 5-MeO-DMT (“foxy-methoxy”), and related compounds. Phenylethylamines (hallucinogenic amphetamines) include methylenedioxyamphetamine (MDA), methylenedioxymethamphetamine (MDMA, “ecstasy,” duration 8–12 hours), methylenedioxyethylamphetamine (MDEA), paramethoxyamphetamine, dimethoxyamphetamine, and mescaline from the peyote cactus, which is often adulterated with LSD and lasts 6–12 hours. Arylcycloalkylamines include phencyclidine (PCP), with highly variable duration reported from 11–96 hours, and ketamine, with effects lasting 30–120 minutes depending on route. Anticholinergic plant sources include deadly nightshade (Atropa belladonna) and jimsonweed (Datura stramonium). Other agents include piperazines such as benzylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP), dextromethorphan (DXM) with duration 3–6 hours, and marijuana.
Clinical Findings And Presentation
Clinical effects vary considerably by agent, dose, and individual susceptibility. Symptoms may last 4–12 hours and up to 96 hours in some cases. Hallucinogen intoxication is typically characterized by sympathetic arousal. Patients are often oriented and able to provide a history of exposure even while experiencing delusions. Early symptoms include nausea, flushing, chills, and tremor. Neurologic effects often begin with restlessness and dizziness, and a desire to laugh is common with Psilocybe mushroom ingestion. Psychiatric manifestations include anxiety, despair, helplessness, and dread. Perceptual disturbances include visual distortion or intensification, tactile distortions (especially with mescaline), and synesthesia such as “seeing sounds.” Religious or mystical experiences and sleep disruption may occur.
Neurologic signs include bizarre behavior, speech disruption, mydriasis, piloerection, and hyperreflexia. Massive exposures may result in coma. Convulsions are most often associated with hallucinogenic amphetamines, and children may develop hyperpyrexia after Psilocybe ingestion. Pulmonary findings include mild tachypnea, with respiratory arrest possible in severe intoxication. Cardiovascular effects include tachycardia, hypertension, dysrhythmias, and intracerebral hemorrhage, particularly with hallucinogenic amphetamines. Gastrointestinal symptoms include nausea and vomiting, especially with mescaline. Metabolic complications include hyperpyrexia, particularly with MDMA use in crowded environments such as rave clubs, which may progress to hepatic failure, renal failure, and disseminated intravascular coagulation and can be fatal. Hyponatremia has been reported with MDMA. High doses may disrupt platelet serotonin function, leading to coagulopathies and hemorrhage.
History And Physical Examination
History should focus on identifying the substance or substances used, route of exposure, quantity, time of ingestion, and setting of exposure. Physical examination requires accurate vital signs, with particular attention to body temperature, and a detailed neurologic and psychiatric assessment.
Key Emergency Workup
Initial evaluation should include continuous monitoring of vital signs and core temperature measurement. Cardiac monitoring is recommended. Assess for rhabdomyolysis by measuring creatine kinase and evaluating urine for myoglobin.
Laboratory And Imaging Evaluation
Laboratory testing may include electrolytes, blood urea nitrogen, creatinine, glucose, coagulation studies, and arterial or venous blood gas analysis as clinically indicated. Urine toxicology screening is rarely helpful because most hallucinogens are not detected on routine screens, amphetamine assays may be negative for hallucinogenic amphetamines such as MDMA, and distinguishing specific agents rarely changes management. Imaging should be guided by clinical suspicion and may include chest radiography for suspected aspiration, aortic pathology, or trauma, head CT for intracranial hemorrhage or lesions, and abdominal radiography if ingested drug packets are suspected.
Differential Considerations
The differential diagnosis includes hypoglycemia, meningitis, encephalitis, sepsis, intracranial hemorrhage or mass lesions, withdrawal syndromes (ethanol, sedative–hypnotics, baclofen), serotonin syndrome (particularly with co-ingestion of serotonergic agents), primary psychiatric illness including prolonged psychosis associated with LSD, chronic amphetamine or cocaine use, steroid-induced psychosis, and infectious or febrile seizures in hyperpyrexic children.
Prehospital Management
Management controversies include the choice between benzodiazepines, neuroleptics, or physical restraints for agitation. Benzodiazepines are generally preferred. Sedation may obscure symptoms and limit history but is often necessary for safe transport. Hyperthermic patients should be sedated rather than physically restrained, and cooling measures should be initiated early.
Initial Stabilization Approach
Management begins with airway, breathing, and circulation assessment. Aggressive cooling is required for hyperthermia. Establish IV access and provide isotonic fluids for dehydration or suspected rhabdomyolysis. In patients with altered mental status, check blood glucose and consider naloxone, dextrose, and thiamine as indicated.
Emergency Department Treatment
Supportive care is the mainstay. Cooling measures include cool mist and fans. Benzodiazepines are first-line therapy for agitation, anxiety, or autonomic instability. Paralysis with intubation may be required in severe cases, generally avoiding succinylcholine. Neuroleptics are rarely used because they may intensify hallucinogenic effects and lower the seizure threshold. Activated charcoal is generally not helpful due to rapid absorption and delayed presentation, but may be considered within 2–3 hours of ingestion in patients with a protected airway, especially for anticholinergic agents or ingested seeds. Patients should be placed in a quiet, calm environment. Maintain urine output at 2–3 mL/kg/hr and consider urine alkalinization when treating rhabdomyolysis.
Medication Options
Benzodiazepines such as diazepam 5–10 mg IV (pediatric dose 0.2–0.5 mg/kg) or lorazepam 1–4 mg IV/IM (pediatric dose 0.02–0.05 mg/kg) may be repeated as needed. Dextrose should be administered for hypoglycemia. Haloperidol 2.5–5 mg IV/IM may be used cautiously in adults for refractory agitation, but is generally avoided in children. Naloxone may be administered when opioid co-ingestion is suspected. Sodium bicarbonate infusion may be used for rhabdomyolysis to maintain urine alkalinity. Thiamine 100 mg IV or IM is recommended in at-risk patients.
Disposition And Follow-Up
Admission is indicated for severe intoxication, atypical or prolonged presentations, symptoms persisting longer than 12 hours, or prolonged agitation and hyperthermia with risk of rhabdomyolysis or organ damage. Most patients may be discharged after observation once asymptomatic and clinically stable. Suspected pediatric abuse or neglect requires referral to child protective services. Discharged patients should be advised to follow up with a primary care provider, psychiatrist, or substance use counseling service.
Clinical Pearls And Pitfalls
Hyperthermia must be recognized and treated immediately with aggressive temperature reduction. Violent or agitated patients require appropriate physical and chemical restraints to ensure safety. Serial examinations and vital sign monitoring, especially temperature, are essential. Do not assume clinical improvement once agitation subsides, as deterioration to severe toxicity may still occur.
Core Concept
Hallucinogen poisoning refers to toxic exposure to substances that predominantly alter perception, cognition, and mood. These agents act by potentiating neurotransmitter release or binding directly to central nervous system receptors. The serotonergic system (5-hydroxytryptamine, 5-HT) is most commonly involved, with many hallucinogens acting as agonists or antagonists at 5-HT receptor subtypes. Additional pathways affected include norepinephrine, N-methyl-D-aspartate (NMDA), and dopamine systems.
Cause And Exposure Patterns
Most hallucinogen exposures are intentional. Common agents include indoleamines such as lysergic acid diethylamide (LSD), with effects lasting 6–12 hours, and morning glory (Ipomoea species). Tryptamines include psilocybin from Psilocybe mushrooms, which are frequently adulterated with LSD, as well as N,N-dimethyltryptamine (DMT), 5-MeO-DMT (“foxy-methoxy”), and related compounds. Phenylethylamines (hallucinogenic amphetamines) include methylenedioxyamphetamine (MDA), methylenedioxymethamphetamine (MDMA, “ecstasy,” duration 8–12 hours), methylenedioxyethylamphetamine (MDEA), paramethoxyamphetamine, dimethoxyamphetamine, and mescaline from the peyote cactus, which is often adulterated with LSD and lasts 6–12 hours. Arylcycloalkylamines include phencyclidine (PCP), with highly variable duration reported from 11–96 hours, and ketamine, with effects lasting 30–120 minutes depending on route. Anticholinergic plant sources include deadly nightshade (Atropa belladonna) and jimsonweed (Datura stramonium). Other agents include piperazines such as benzylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP), dextromethorphan (DXM) with duration 3–6 hours, and marijuana.
Clinical Findings And Presentation
Clinical effects vary considerably by agent, dose, and individual susceptibility. Symptoms may last 4–12 hours and up to 96 hours in some cases. Hallucinogen intoxication is typically characterized by sympathetic arousal. Patients are often oriented and able to provide a history of exposure even while experiencing delusions. Early symptoms include nausea, flushing, chills, and tremor. Neurologic effects often begin with restlessness and dizziness, and a desire to laugh is common with Psilocybe mushroom ingestion. Psychiatric manifestations include anxiety, despair, helplessness, and dread. Perceptual disturbances include visual distortion or intensification, tactile distortions (especially with mescaline), and synesthesia such as “seeing sounds.” Religious or mystical experiences and sleep disruption may occur.
Neurologic signs include bizarre behavior, speech disruption, mydriasis, piloerection, and hyperreflexia. Massive exposures may result in coma. Convulsions are most often associated with hallucinogenic amphetamines, and children may develop hyperpyrexia after Psilocybe ingestion. Pulmonary findings include mild tachypnea, with respiratory arrest possible in severe intoxication. Cardiovascular effects include tachycardia, hypertension, dysrhythmias, and intracerebral hemorrhage, particularly with hallucinogenic amphetamines. Gastrointestinal symptoms include nausea and vomiting, especially with mescaline. Metabolic complications include hyperpyrexia, particularly with MDMA use in crowded environments such as rave clubs, which may progress to hepatic failure, renal failure, and disseminated intravascular coagulation and can be fatal. Hyponatremia has been reported with MDMA. High doses may disrupt platelet serotonin function, leading to coagulopathies and hemorrhage.
History And Physical Examination
History should focus on identifying the substance or substances used, route of exposure, quantity, time of ingestion, and setting of exposure. Physical examination requires accurate vital signs, with particular attention to body temperature, and a detailed neurologic and psychiatric assessment.
Key Emergency Workup
Initial evaluation should include continuous monitoring of vital signs and core temperature measurement. Cardiac monitoring is recommended. Assess for rhabdomyolysis by measuring creatine kinase and evaluating urine for myoglobin.
Laboratory And Imaging Evaluation
Laboratory testing may include electrolytes, blood urea nitrogen, creatinine, glucose, coagulation studies, and arterial or venous blood gas analysis as clinically indicated. Urine toxicology screening is rarely helpful because most hallucinogens are not detected on routine screens, amphetamine assays may be negative for hallucinogenic amphetamines such as MDMA, and distinguishing specific agents rarely changes management. Imaging should be guided by clinical suspicion and may include chest radiography for suspected aspiration, aortic pathology, or trauma, head CT for intracranial hemorrhage or lesions, and abdominal radiography if ingested drug packets are suspected.
Differential Considerations
The differential diagnosis includes hypoglycemia, meningitis, encephalitis, sepsis, intracranial hemorrhage or mass lesions, withdrawal syndromes (ethanol, sedative–hypnotics, baclofen), serotonin syndrome (particularly with co-ingestion of serotonergic agents), primary psychiatric illness including prolonged psychosis associated with LSD, chronic amphetamine or cocaine use, steroid-induced psychosis, and infectious or febrile seizures in hyperpyrexic children.
Prehospital Management
Management controversies include the choice between benzodiazepines, neuroleptics, or physical restraints for agitation. Benzodiazepines are generally preferred. Sedation may obscure symptoms and limit history but is often necessary for safe transport. Hyperthermic patients should be sedated rather than physically restrained, and cooling measures should be initiated early.
Initial Stabilization Approach
Management begins with airway, breathing, and circulation assessment. Aggressive cooling is required for hyperthermia. Establish IV access and provide isotonic fluids for dehydration or suspected rhabdomyolysis. In patients with altered mental status, check blood glucose and consider naloxone, dextrose, and thiamine as indicated.
Emergency Department Treatment
Supportive care is the mainstay. Cooling measures include cool mist and fans. Benzodiazepines are first-line therapy for agitation, anxiety, or autonomic instability. Paralysis with intubation may be required in severe cases, generally avoiding succinylcholine. Neuroleptics are rarely used because they may intensify hallucinogenic effects and lower the seizure threshold. Activated charcoal is generally not helpful due to rapid absorption and delayed presentation, but may be considered within 2–3 hours of ingestion in patients with a protected airway, especially for anticholinergic agents or ingested seeds. Patients should be placed in a quiet, calm environment. Maintain urine output at 2–3 mL/kg/hr and consider urine alkalinization when treating rhabdomyolysis.
Medication Options
Benzodiazepines such as diazepam 5–10 mg IV (pediatric dose 0.2–0.5 mg/kg) or lorazepam 1–4 mg IV/IM (pediatric dose 0.02–0.05 mg/kg) may be repeated as needed. Dextrose should be administered for hypoglycemia. Haloperidol 2.5–5 mg IV/IM may be used cautiously in adults for refractory agitation, but is generally avoided in children. Naloxone may be administered when opioid co-ingestion is suspected. Sodium bicarbonate infusion may be used for rhabdomyolysis to maintain urine alkalinity. Thiamine 100 mg IV or IM is recommended in at-risk patients.
Disposition And Follow-Up
Admission is indicated for severe intoxication, atypical or prolonged presentations, symptoms persisting longer than 12 hours, or prolonged agitation and hyperthermia with risk of rhabdomyolysis or organ damage. Most patients may be discharged after observation once asymptomatic and clinically stable. Suspected pediatric abuse or neglect requires referral to child protective services. Discharged patients should be advised to follow up with a primary care provider, psychiatrist, or substance use counseling service.
Clinical Pearls And Pitfalls
Hyperthermia must be recognized and treated immediately with aggressive temperature reduction. Violent or agitated patients require appropriate physical and chemical restraints to ensure safety. Serial examinations and vital sign monitoring, especially temperature, are essential. Do not assume clinical improvement once agitation subsides, as deterioration to severe toxicity may still occur.
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Emergency And Acute Medicine – Hallucinations
Overview And Definitions
Hallucinations represent a clinical symptom rather than a definitive diagnosis. They may be auditory, visual, tactile, gustatory, or olfactory in nature. A hallucination is defined as a sensory perception experienced as real in the absence of external stimulation of the relevant sensory organ and is perceived as originating from that organ. Insight into the unreality of the experience may or may not be present. An illusion refers to a misinterpretation of an actual external stimulus. A flashback is the re-experiencing of a prior memory, sensation, or perceptual event with a compelling sense of reality. A pseudohallucination describes a hallucination-like experience that is not perceived through a sensory organ, such as voices perceived internally rather than externally.
Epidemiology And Frequency
The lifetime prevalence of auditory hallucinations in the general population is estimated at 4–8%, although rates vary depending on definitions and inclusion of pseudohallucinations. More than half of elderly patients with dementia experience hallucinations or paranoid symptoms.
Causes And Contributing Factors
Hallucinations arise from a wide range of psychiatric, medical, neurologic, metabolic, infectious, and substance-related causes. Psychiatric causes include schizophrenia, bipolar disorder with mania, and major depressive disorder. Acute intoxications associated with hallucinations include ethanol, cannabis, and synthetic cannabinoids such as K2 and Spice. Sympathomimetic agents include amphetamine, methamphetamine, cocaine, and synthetic cathinones. NMDA antagonists such as ketamine, PCP, and dextromethorphan are well-known precipitants. Serotonergic substances include MDMA, LSD, mescaline, psilocybin, 2C compounds, and 5-MeO derivatives. Salvia divinorum acts as a kappa opioid receptor agonist and may cause synesthesia. Opiates and inhalants such as toluene and nitrous oxide are additional contributors. Medications associated with hallucinations include anticholinergic agents, corticosteroids, and methylphenidate. Withdrawal states from ethanol, benzodiazepines, barbiturates, and GHB commonly produce hallucinations. Substance-induced psychotic disorders include methamphetamine-associated psychosis, which may persist or recur even without ongoing use, and cannabis-induced psychosis. Infectious causes include meningitis and encephalitis, and in patients with dementia, common infections such as urinary tract infection or pneumonia may trigger hallucinations. Metabolic causes include hypoglycemia, electrolyte disturbances, thyroid or adrenal disease, Wilson disease, and thiamine deficiency. Neurologic etiologies include seizures, migraines, intracranial hemorrhage, brain tumors, stroke, and Tourette syndrome. Neurodegenerative disorders such as Parkinson disease, Lewy body dementia, Alzheimer disease, and HIV are also associated. Ocular conditions include glaucoma, macular degeneration, and Charles Bonnet syndrome. Other causes include sensory or sleep deprivation, extreme fatigue or stress, heat illness, religious or ritual practices, and transitions between sleep and wakefulness.
Special Population Considerations
In pediatric patients, hallucinations are relatively common and often developmentally normal. Most children with hallucinations do not have psychosis. Hallucinations may occur during delirium associated with fever, and a medical or neurologic cause should always be considered. In geriatric patients, hallucinations are most often due to organic causes and commonly accompany dementia, depression, medication reactions, or substance use. They are frequently associated with agitation, and atypical antipsychotics may be effective but must be used cautiously due to adverse effects.
Clinical Evaluation And Presentation
Obtaining an accurate history is often challenging, and collateral information from family, EMS, police, or caregivers is critical. Clinicians should assess for behavioral changes from baseline, delusions, persecutory beliefs, prior hallucinations, medication changes, and substance use. Rapidly fluctuating cognition suggests delirium. Headache may indicate migraine or intracranial pathology. Physical examination findings vary by etiology. Acute psychosis may present with disorganized thought and response to internal stimuli. Mania is characterized by pressured speech and excessive talking. Delirium presents with altered consciousness, disorientation, and abnormal vital signs. CNS lesions may cause cranial nerve deficits, aphasia, focal neurologic findings, or gait abnormalities. Systemic or infectious illness may present with fever, nuchal rigidity, asterixis, myoclonus, jaundice, or ascites. Intoxication or withdrawal syndromes may show mydriasis, tachycardia, hypertension, hyperthermia, diaphoresis, agitation, miosis, bradypnea, hyperreflexia, clonus, tremor, or nystagmus depending on the agent involved.
Diagnostic Testing And Interpretation
Initial evaluation commonly includes a complete blood count, serum chemistries, ethanol, acetaminophen, and salicylate levels, and urinalysis. Additional testing is guided by clinical suspicion and may include urine drug screening, ECG, thyroid studies, liver function tests, RPR, folate, vitamin B12, thiamine levels, and specific drug concentrations. Brain imaging with CT or MRI and chest radiography may be indicated. Lumbar puncture should be considered if infection is suspected, and EEG may be useful when seizures are a concern. Emergent psychiatric consultation is indicated for acute psychiatric illness or decompensation of chronic psychiatric disease.
Core Emergency Department Workup
Patients with a known psychiatric disorder and characteristic symptoms typically require limited testing. Patients with undifferentiated hallucinations, especially those in high-risk populations, require comprehensive medical evaluation to exclude organic causes.
Differential Diagnosis Considerations
The primary goal of emergency evaluation is to distinguish psychiatric from nonpsychiatric causes. Psychiatric etiologies are more likely when hallucinations are auditory or command in nature, incorporated into a delusional system, occur between ages 13 and 40, and are associated with flat affect, normal orientation, and disorganized attention. Nonpsychiatric causes are more likely in elderly patients, individuals with substance use history, those without prior psychiatric illness, patients with underlying medical conditions, and those of lower socioeconomic status. Visual hallucinations are more common in delirium, dementia, migraines, dopamine agonist therapy, posterior cerebral infarcts, and narcolepsy.
Management Principles
Prehospital providers should note environmental clues such as unsafe living conditions or drug paraphernalia. Initial management focuses on airway, breathing, and circulation, correction of abnormal vital signs, finger-stick glucose testing, and consideration of thiamine administration. Agitation should be managed with de-escalation techniques, physical restraints when necessary, and chemical sedation. Identified medical causes should be treated directly, and antipsychotics are often unnecessary in these cases. Acute psychosis or psychiatric decompensation is treated with antipsychotics and benzodiazepines. Hallucinations associated with intoxication and excited delirium require supportive care and benzodiazepines. In dementia-related hallucinations, reversible causes should be treated first, and antipsychotics used cautiously due to risks.
Safety Alert
In patients with hallucinations and excited delirium due to acute intoxication, except ethanol-related cases, benzodiazepines are preferred and antipsychotics should be avoided.
Disposition And Follow-Up
Hospital admission is required for patients with medical conditions necessitating inpatient care or acute psychiatric illness requiring hospitalization. Discharge may be considered when symptoms resolve after treatment of a reversible cause or when psychiatric decompensation is stabilized with a safe home environment and reliable follow-up. Referral for substance use treatment should be arranged when appropriate. Follow-up should be tailored to the underlying medical or psychiatric condition.
Clinical Pearls And Common Errors
Do not assume auditory hallucinations are psychiatric or that visual or tactile hallucinations are medical without a full evaluation. In older adults, hallucinations should never be attributed to psychiatric disease without extensive medical workup. Antipsychotics should not be used for excited delirium due to acute intoxication except in ethanol withdrawal; benzodiazepines are the treatment of choice.
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Emergency and Acute Medicine-Gillian–Barré Syndrome
Basics Description
Guillain–Barré syndrome (GBS) is a group of peripheral nerve disorders characterized by autoimmune-mediated demyelination and axonal degeneration of peripheral nerves, leading to acute ascending paralysis. The disease involves both humoral and cellular immune mechanisms and is the leading cause of acute flaccid paralysis worldwide since the advent of polio vaccination. It is often triggered by a preceding bacterial or viral infection and has an increasing incidence with advancing age and male gender. The average incidence is approximately 1.1 per 100,000 persons per year. Weakness typically reaches its maximum severity within 2–4 weeks, followed by spontaneous recovery over weeks to months. About 80% of patients achieve full recovery at 1 year, 20% are unable to walk at 6 months, and approximately 5% die from complications such as pulmonary embolism, infection, or cardiac arrhythmias.
The most common subtype is acute inflammatory demyelinating polyradiculoneuropathy (AIDP), accounting for about 90% of cases. Other forms include acute motor axonal neuropathy (AMAN), acute motor sensory axonal neuropathy (AMSAN), acute panautonomic neuropathy, and Miller Fisher syndrome. These variants differ in pathophysiology, clinical features, and recovery patterns.
Etiology
GBS is most commonly postinfectious, with approximately two-thirds of patients reporting an antecedent illness, usually respiratory or gastrointestinal, occurring 1–3 weeks before neurologic symptoms. Different autoantibodies are associated with different subtypes. Campylobacter jejuni is the most common bacterial trigger, while cytomegalovirus is the most frequent viral antecedent. Other associated infections include Epstein–Barr virus, varicella-zoster virus, HIV, and Mycoplasma pneumoniae. A causal relationship with vaccines is not well supported, aside from a slight increased risk noted with the 1976 swine influenza vaccine.
Diagnosis Signs And Symptoms
Patients typically present with rapidly progressive, symmetric, ascending weakness. Sensory symptoms are usually mild or absent, though paresthesias of the fingers or toes may occur. Pain is common, especially involving the pelvis, shoulder girdle, or posterior thighs. Cranial nerve involvement may lead to dysphagia, facial weakness, or ophthalmoplegia. Autonomic dysfunction can manifest as blood pressure instability, cardiac dysrhythmias, ileus, or urinary retention. Respiratory insufficiency occurs in approximately 25% of patients. Progression beyond 8 weeks suggests an alternative diagnosis such as chronic inflammatory demyelinating polyradiculoneuropathy (CIDP).
Diagnosis Tests And Interpretation
Diagnosis is primarily clinical. Laboratory and imaging studies support the diagnosis and help exclude other conditions. Cerebrospinal fluid analysis typically shows albuminocytologic dissociation, with elevated protein and few or no white blood cells, often becoming apparent after 7–10 days. A CSF white blood cell count greater than 10–50 cells/mm³ suggests an alternative diagnosis. Electrolytes may reveal hyponatremia due to SIADH. CT or MRI is used to rule out spinal cord compression. Electrophysiologic studies demonstrate abnormalities consistent with demyelination or axonal injury and are confirmatory.
Differential Diagnosis
The differential diagnosis includes other polyneuropathies, spinal cord disorders, neuromuscular junction diseases, muscle disorders, metabolic abnormalities, and functional neurologic conditions.
Treatment Pre Hospital
Early attention to airway protection is essential due to the risk of rapid respiratory compromise.
Initial Stabilization Therapy
Careful and repeated airway assessment is critical, as progression to respiratory failure can occur quickly.
Ed Treatment Procedures
Approximately 30% of patients require ventilatory support, sometimes within 24–48 hours of symptom onset. Frequent monitoring of respiratory function using forced vital capacity (FVC) or negative inspiratory force (NIF) is recommended. ICU admission is indicated if FVC is less than 20 mL/kg or NIF is less than 30 cm H₂O, with intubation strongly considered if FVC drops below 15 mL/kg. Autonomic instability should be closely monitored. Early neurology consultation is essential.
Medication
Disease-modifying therapy includes plasmapheresis or intravenous immunoglobulin (IVIG), initiated in consultation with neurology. IVIG is typically given at 400 mg/kg/day for 5 days. Pain management may include acetaminophen, NSAIDs, or gabapentin. Corticosteroids are not beneficial and may delay recovery.
Follow-Up Disposition
All patients with suspected or confirmed GBS require hospital admission for close monitoring. ICU admission is necessary for those with respiratory compromise, autonomic dysfunction, or rapidly progressive weakness. Discharge should only be considered after neurologic consultation.
Follow-Up Recommendations
Ongoing follow-up is determined by neurology. Factors associated with poorer outcomes include advanced age, longer time to symptom nadir, need for mechanical ventilation, and preceding diarrheal illness, particularly due to C. jejuni.
Clinical Insights And Common Diagnostic Errors
Frequent assessment of respiratory parameters such as FVC and NIF is essential to anticipate airway compromise. A CSF white blood cell count exceeding 10–50 cells/mm³ should prompt reconsideration of the diagnosis. Common errors include failing to obtain appropriate neuroimaging to exclude alternative causes, delaying neurology consultation, and not admitting or closely observing patients with suspected GBS.
Basics Description
Guillain–Barré syndrome (GBS) is a group of peripheral nerve disorders characterized by autoimmune-mediated demyelination and axonal degeneration of peripheral nerves, leading to acute ascending paralysis. The disease involves both humoral and cellular immune mechanisms and is the leading cause of acute flaccid paralysis worldwide since the advent of polio vaccination. It is often triggered by a preceding bacterial or viral infection and has an increasing incidence with advancing age and male gender. The average incidence is approximately 1.1 per 100,000 persons per year. Weakness typically reaches its maximum severity within 2–4 weeks, followed by spontaneous recovery over weeks to months. About 80% of patients achieve full recovery at 1 year, 20% are unable to walk at 6 months, and approximately 5% die from complications such as pulmonary embolism, infection, or cardiac arrhythmias.
The most common subtype is acute inflammatory demyelinating polyradiculoneuropathy (AIDP), accounting for about 90% of cases. Other forms include acute motor axonal neuropathy (AMAN), acute motor sensory axonal neuropathy (AMSAN), acute panautonomic neuropathy, and Miller Fisher syndrome. These variants differ in pathophysiology, clinical features, and recovery patterns.
Etiology
GBS is most commonly postinfectious, with approximately two-thirds of patients reporting an antecedent illness, usually respiratory or gastrointestinal, occurring 1–3 weeks before neurologic symptoms. Different autoantibodies are associated with different subtypes. Campylobacter jejuni is the most common bacterial trigger, while cytomegalovirus is the most frequent viral antecedent. Other associated infections include Epstein–Barr virus, varicella-zoster virus, HIV, and Mycoplasma pneumoniae. A causal relationship with vaccines is not well supported, aside from a slight increased risk noted with the 1976 swine influenza vaccine.
Diagnosis Signs And Symptoms
Patients typically present with rapidly progressive, symmetric, ascending weakness. Sensory symptoms are usually mild or absent, though paresthesias of the fingers or toes may occur. Pain is common, especially involving the pelvis, shoulder girdle, or posterior thighs. Cranial nerve involvement may lead to dysphagia, facial weakness, or ophthalmoplegia. Autonomic dysfunction can manifest as blood pressure instability, cardiac dysrhythmias, ileus, or urinary retention. Respiratory insufficiency occurs in approximately 25% of patients. Progression beyond 8 weeks suggests an alternative diagnosis such as chronic inflammatory demyelinating polyradiculoneuropathy (CIDP).
Diagnosis Tests And Interpretation
Diagnosis is primarily clinical. Laboratory and imaging studies support the diagnosis and help exclude other conditions. Cerebrospinal fluid analysis typically shows albuminocytologic dissociation, with elevated protein and few or no white blood cells, often becoming apparent after 7–10 days. A CSF white blood cell count greater than 10–50 cells/mm³ suggests an alternative diagnosis. Electrolytes may reveal hyponatremia due to SIADH. CT or MRI is used to rule out spinal cord compression. Electrophysiologic studies demonstrate abnormalities consistent with demyelination or axonal injury and are confirmatory.
Differential Diagnosis
The differential diagnosis includes other polyneuropathies, spinal cord disorders, neuromuscular junction diseases, muscle disorders, metabolic abnormalities, and functional neurologic conditions.
Treatment Pre Hospital
Early attention to airway protection is essential due to the risk of rapid respiratory compromise.
Initial Stabilization Therapy
Careful and repeated airway assessment is critical, as progression to respiratory failure can occur quickly.
Ed Treatment Procedures
Approximately 30% of patients require ventilatory support, sometimes within 24–48 hours of symptom onset. Frequent monitoring of respiratory function using forced vital capacity (FVC) or negative inspiratory force (NIF) is recommended. ICU admission is indicated if FVC is less than 20 mL/kg or NIF is less than 30 cm H₂O, with intubation strongly considered if FVC drops below 15 mL/kg. Autonomic instability should be closely monitored. Early neurology consultation is essential.
Medication
Disease-modifying therapy includes plasmapheresis or intravenous immunoglobulin (IVIG), initiated in consultation with neurology. IVIG is typically given at 400 mg/kg/day for 5 days. Pain management may include acetaminophen, NSAIDs, or gabapentin. Corticosteroids are not beneficial and may delay recovery.
Follow-Up Disposition
All patients with suspected or confirmed GBS require hospital admission for close monitoring. ICU admission is necessary for those with respiratory compromise, autonomic dysfunction, or rapidly progressive weakness. Discharge should only be considered after neurologic consultation.
Follow-Up Recommendations
Ongoing follow-up is determined by neurology. Factors associated with poorer outcomes include advanced age, longer time to symptom nadir, need for mechanical ventilation, and preceding diarrheal illness, particularly due to C. jejuni.
Clinical Insights And Common Diagnostic Errors
Frequent assessment of respiratory parameters such as FVC and NIF is essential to anticipate airway compromise. A CSF white blood cell count exceeding 10–50 cells/mm³ should prompt reconsideration of the diagnosis. Common errors include failing to obtain appropriate neuroimaging to exclude alternative causes, delaying neurology consultation, and not admitting or closely observing patients with suspected GBS.
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Emergency And Acute Medicine - Granulocytopenia
Basics Description
Granulocytopenia is a significant reduction in circulating granulocytes in peripheral blood. The three granulocyte classes are neutrophils (polymorphonuclear cells and bands), eosinophils, and basophils. Because neutrophils predominate, granulocytopenia is commonly used interchangeably with neutropenia. Granulocytes are essential components of innate immunity.
Clinical risk is best assessed by the absolute neutrophil count (ANC), calculated as WBC × (% PMNs + bands). Modern analyzers typically report ANC automatically. Neutropenia is defined as ANC <1,500 cells />m³: mild (1,000–1,500), moderate (500–1,000), severe (<500). agranulocytosis refers to anc <100. patients with rapidly falling counts are at higher infection risk than those low but recovering counts. myelodysplastic syndromes may be functionally granulocytopenic due impaired neutrophil function.< />pan>
Four mechanisms lead to granulocytopenia: decreased production, ineffective granulopoiesis, margination of neutrophils to the vascular endothelium, and increased peripheral destruction. Untreated febrile neutropenia carries mortality rates up to 50%, closely related to severity, duration, and delay to antibiotic therapy. Approximately 21% of oncology patients with neutropenic fever develop serious complications.
Pediatric considerations include physiologically elevated neonatal ANC during the first days of life and lower infection risk in otherwise healthy children older than 3 months with isolated moderate neutropenia.
Etiology
The most common cause is myelosuppressive chemotherapy or radiation, typically occurring 5–10 days after treatment. Drug-induced granulocytopenia is the second most common cause and usually requires at least 4 weeks of exposure, resolving within 30 days of discontinuation. High-risk drugs include clozapine, sulfasalazine, thioamides, antiplatelet agents, antiepileptics, NSAIDs, methotrexate, cyclophosphamide, colchicine, azathioprine, and ganciclovir.
Infectious causes include bacterial (typhoid, Shigella, brucellosis, tularemia, tuberculosis), parasitic (malaria, kala-azar), rickettsial (ehrlichiosis, RMSF), and viral infections, particularly HIV, hepatitis B, and EBV.
Immune-mediated causes include primary immune neutropenia, autoimmune diseases, thymoma, complement activation, transfusion reactions, alcoholism, nutritional deficiencies (vitamin B12, folate, copper), chronic idiopathic neutropenia, and pure white cell aplasia. Numerous congenital causes exist in pediatric populations.
Diagnosis Signs And Symptoms
Patients may present with fever or subtle signs of bacterial or fungal infection. Symptoms of pancytopenia include fatigue, pallor, petechiae, epistaxis, and spontaneous bleeding. Medication history, prior ANC values, and family history are essential. Patients should be questioned carefully about systemic and localizing symptoms of infection.
Physical examination focuses on identifying infection, including careful oral, pulmonary, abdominal, skin, catheter site, and perirectal assessment. Rectal examination is relatively contraindicated until antibiotics are initiated.
Essential Workup
A complete physical examination with emphasis on oral mucosa, perianal region, skin, lungs, and abdomen is required. Rectal examination may be performed after initiation of antibiotics if clinically indicated.
Diagnosis Tests And Interpretation
CBC with differential to determine ANC is mandatory. Additional studies include liver function tests, blood cultures from two sites (including catheter if present), urinalysis and urine culture, sputum or stool cultures when indicated, and CSF analysis if neurologic symptoms are present. Chest radiography should be obtained even in the absence of respiratory findings.
Differential Diagnosis
Laboratory error, malignancy, chemotherapy effects, medication reactions, infections, autoimmune disease, genetic conditions, transfusion reactions, nutritional deficiencies, tumor lysis syndrome, and hypersplenism. Some African American patients may have a normal baseline ANC around 1,000 cells/mm³.
Treatment Initial Stabilization Therapy
Patients in shock require immediate resuscitation with 1 L of 0.9% NS (pediatrics: 20 mL/kg), vasopressors if needed, and early goal-directed therapy when appropriate.
Ed Treatment Procedures
Initiate protective isolation when possible. After cultures are obtained, administer empiric broad-spectrum antibiotics promptly for suspected infection. Appropriate regimens include cefepime, ceftazidime (with or without an aminoglycoside), imipenem/cilastatin, fluoroquinolones, or an aminoglycoside combined with an antipseudomonal β-lactam. Vancomycin should be added when MRSA risk is present.
Medication
Common agents include cefepime, ceftazidime, imipenem/cilastatin, levofloxacin, aminoglycosides, mezlocillin, and vancomycin. Dosing should be adjusted for renal function and patient age.
Follow-Up Disposition
Admission is indicated for any signs of infection, unreliable follow-up, or inability to ensure close monitoring. Selected asymptomatic patients with known chronic granulocytopenia and reliable follow-up may be discharged.
Issues For Referral
All patients with granulocytopenia should be referred to their primary physician or a hematologist.
Follow-Up Recommendations
Patients should return immediately for fever or new symptoms and follow up within 48 hours with their physician.
Key Clinical Insights And Frequent Errors
Infections may present subtly or without classic signs due to impaired inflammatory response. Rectal exams and rectal temperatures should be avoided until antibiotics are started to reduce the risk of perirectal abscess and bacteremia. Febrile patients with ANC <500 require immediate aggressive management with iv fluids and broad-spectrum antibiotics. hepatosplenic candidiasis may emerge during neutrophil recovery presents abscess formation, requiring antifungal therapy such as amphotericin b.< />pan>
Basics Description
Granulocytopenia is a significant reduction in circulating granulocytes in peripheral blood. The three granulocyte classes are neutrophils (polymorphonuclear cells and bands), eosinophils, and basophils. Because neutrophils predominate, granulocytopenia is commonly used interchangeably with neutropenia. Granulocytes are essential components of innate immunity.
Clinical risk is best assessed by the absolute neutrophil count (ANC), calculated as WBC × (% PMNs + bands). Modern analyzers typically report ANC automatically. Neutropenia is defined as ANC <1,500 cells />m³: mild (1,000–1,500), moderate (500–1,000), severe (<500). agranulocytosis refers to anc <100. patients with rapidly falling counts are at higher infection risk than those low but recovering counts. myelodysplastic syndromes may be functionally granulocytopenic due impaired neutrophil function.< />pan>
Four mechanisms lead to granulocytopenia: decreased production, ineffective granulopoiesis, margination of neutrophils to the vascular endothelium, and increased peripheral destruction. Untreated febrile neutropenia carries mortality rates up to 50%, closely related to severity, duration, and delay to antibiotic therapy. Approximately 21% of oncology patients with neutropenic fever develop serious complications.
Pediatric considerations include physiologically elevated neonatal ANC during the first days of life and lower infection risk in otherwise healthy children older than 3 months with isolated moderate neutropenia.
Etiology
The most common cause is myelosuppressive chemotherapy or radiation, typically occurring 5–10 days after treatment. Drug-induced granulocytopenia is the second most common cause and usually requires at least 4 weeks of exposure, resolving within 30 days of discontinuation. High-risk drugs include clozapine, sulfasalazine, thioamides, antiplatelet agents, antiepileptics, NSAIDs, methotrexate, cyclophosphamide, colchicine, azathioprine, and ganciclovir.
Infectious causes include bacterial (typhoid, Shigella, brucellosis, tularemia, tuberculosis), parasitic (malaria, kala-azar), rickettsial (ehrlichiosis, RMSF), and viral infections, particularly HIV, hepatitis B, and EBV.
Immune-mediated causes include primary immune neutropenia, autoimmune diseases, thymoma, complement activation, transfusion reactions, alcoholism, nutritional deficiencies (vitamin B12, folate, copper), chronic idiopathic neutropenia, and pure white cell aplasia. Numerous congenital causes exist in pediatric populations.
Diagnosis Signs And Symptoms
Patients may present with fever or subtle signs of bacterial or fungal infection. Symptoms of pancytopenia include fatigue, pallor, petechiae, epistaxis, and spontaneous bleeding. Medication history, prior ANC values, and family history are essential. Patients should be questioned carefully about systemic and localizing symptoms of infection.
Physical examination focuses on identifying infection, including careful oral, pulmonary, abdominal, skin, catheter site, and perirectal assessment. Rectal examination is relatively contraindicated until antibiotics are initiated.
Essential Workup
A complete physical examination with emphasis on oral mucosa, perianal region, skin, lungs, and abdomen is required. Rectal examination may be performed after initiation of antibiotics if clinically indicated.
Diagnosis Tests And Interpretation
CBC with differential to determine ANC is mandatory. Additional studies include liver function tests, blood cultures from two sites (including catheter if present), urinalysis and urine culture, sputum or stool cultures when indicated, and CSF analysis if neurologic symptoms are present. Chest radiography should be obtained even in the absence of respiratory findings.
Differential Diagnosis
Laboratory error, malignancy, chemotherapy effects, medication reactions, infections, autoimmune disease, genetic conditions, transfusion reactions, nutritional deficiencies, tumor lysis syndrome, and hypersplenism. Some African American patients may have a normal baseline ANC around 1,000 cells/mm³.
Treatment Initial Stabilization Therapy
Patients in shock require immediate resuscitation with 1 L of 0.9% NS (pediatrics: 20 mL/kg), vasopressors if needed, and early goal-directed therapy when appropriate.
Ed Treatment Procedures
Initiate protective isolation when possible. After cultures are obtained, administer empiric broad-spectrum antibiotics promptly for suspected infection. Appropriate regimens include cefepime, ceftazidime (with or without an aminoglycoside), imipenem/cilastatin, fluoroquinolones, or an aminoglycoside combined with an antipseudomonal β-lactam. Vancomycin should be added when MRSA risk is present.
Medication
Common agents include cefepime, ceftazidime, imipenem/cilastatin, levofloxacin, aminoglycosides, mezlocillin, and vancomycin. Dosing should be adjusted for renal function and patient age.
Follow-Up Disposition
Admission is indicated for any signs of infection, unreliable follow-up, or inability to ensure close monitoring. Selected asymptomatic patients with known chronic granulocytopenia and reliable follow-up may be discharged.
Issues For Referral
All patients with granulocytopenia should be referred to their primary physician or a hematologist.
Follow-Up Recommendations
Patients should return immediately for fever or new symptoms and follow up within 48 hours with their physician.
Key Clinical Insights And Frequent Errors
Infections may present subtly or without classic signs due to impaired inflammatory response. Rectal exams and rectal temperatures should be avoided until antibiotics are started to reduce the risk of perirectal abscess and bacteremia. Febrile patients with ANC <500 require immediate aggressive management with iv fluids and broad-spectrum antibiotics. hepatosplenic candidiasis may emerge during neutrophil recovery presents abscess formation, requiring antifungal therapy such as amphotericin b.< />pan>
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Emergency And Acute Medicine - Gout/Pseudogout
Basics Description
Gout is a crystalline arthropathy caused by deposition of monosodium urate in tissues, most commonly affecting middle-aged men and postmenopausal women. It is the most common crystal-induced arthritis and classically progresses through four phases: asymptomatic hyperuricemia (serum urate >7 mg/dL), acute gout, intercritical gout with symptom-free intervals, and chronic tophaceous gout, which occurs in up to 45% of cases.
Risk factors include age >40 years, male sex (male-to-female ratio 2:1–6:1 before age 65, approaching 1:1 thereafter), hypertension, use of loop or thiazide diuretics, high intake of alcohol, meat, seafood, and fructose-sweetened beverages, and obesity. Uric acid nephrolithiasis may lead to renal dysfunction. Chronic disease can result in avascular necrosis and deforming arthritis.
Gout preferentially involves previously damaged tissues such as synovium, subchondral bone, bursae (olecranon, infrapatellar, prepatellar), Achilles tendon, and extensor surfaces of the forearms, toes, fingers, and ear. Rare involvement of the CNS or cardiac valves has been described.
Pseudogout is caused by calcium pyrophosphate crystal deposition and is the most common cause of acute monoarthritis in patients older than 60 years. Risk factors include hypercalcemia, hemochromatosis, hypothyroidism or hyperthyroidism, hypophosphatemia, hypomagnesemia, amyloidosis, and underlying gout.
Etiology
Gout results from deposition of monosodium urate crystals due to underexcretion (most common) or overproduction of uric acid. Acute attacks are often triggered by rapid changes in uric acid levels such as initiation or withdrawal of diuretics, alcohol intake, salicylates, niacin, cyclosporine, lead exposure, or starting uricosurics or allopurinol.
Pseudogout occurs due to excess accumulation of calcium pyrophosphate crystals within the synovium. Minor trauma and acute systemic illness, including surgery or ischemic heart disease, may precipitate attacks of either condition.
Diagnosis Signs And Symptoms
Both gout and pseudogout typically present as acute monoarticular or polyarticular arthritis with warmth, erythema, swelling, and pain. Early attacks often resolve spontaneously within 3–21 days, while later attacks may be longer, more severe, clustered, and polyarticular.
Gout symptoms usually peak within 12–24 hours. Tophi and skin desquamation may be present in advanced disease. Women often present after menopause and more commonly have polyarticular involvement. Presentations may be less dramatic in elderly or immunosuppressed patients. The first metatarsophalangeal joint is most commonly affected, followed by the ankle, knee, hand, and wrist.
Pseudogout more often involves large joints, particularly the knee, followed by the wrist, metacarpals, shoulder, elbow, ankle, hip, and tarsal joints. It may be monoarticular, asymptomatic, mimic osteoarthritis with symmetric degeneration, or present as a pseudorheumatoid arthritis variant with fever and confusion in elderly patients.
Essential Workup
Arthrocentesis with synovial fluid analysis is essential to confirm diagnosis and exclude infection. Aspirate should be examined for crystals, Gram stain, culture, leukocyte count, and differential. Gout fluid typically contains 20,000–100,000 WBC/mm³ without bacteria. Pseudogout fluid usually has fewer than 50,000 WBC/mm³.
Polarized light microscopy shows needle-shaped, strongly negatively birefringent crystals in gout and rhomboid-shaped, weakly positively birefringent crystals in pseudogout.
Diagnosis Tests And Interpretation
CBC often reveals leukocytosis. Chemistry panels assess renal function. Magnesium, calcium, TSH, and iron studies may identify associated conditions. Serum uric acid has limited diagnostic value during acute attacks. Blood and urine cultures are indicated if infection is suspected.
Plain radiographs may show soft tissue swelling in acute gout, while chronic gout demonstrates calcified tophi and characteristic erosions. Pseudogout may show chondrocalcinosis and calcification of cartilage or ligaments. Dual-energy CT can identify urate deposits or nephrolithiasis.
Differential Diagnosis
Septic arthritis, trauma, osteoarthritis, reactive arthritis, rheumatoid arthritis, systemic lupus erythematosus, avascular necrosis, osteomyelitis, sickle cell disease, and other crystal arthropathies.
Treatment Initial Stabilization Therapy
Primary goals are pain control and exclusion of infectious arthritis.
Ed Treatment Procedures
NSAIDs are first-line therapy if tolerated. If contraindicated or ineffective, corticosteroids (oral, IM, IV, or intra-articular) or colchicine may be used. Joint aspiration can provide symptomatic relief. Aspirin should be avoided.
Long-term urate-lowering therapy and prevention strategies are generally not initiated in the ED and include withdrawal of precipitating agents, uricosurics, allopurinol, hydration, urine alkalinization, and prophylactic colchicine or NSAIDs.
Medication
Therapeutic options include NSAIDs, colchicine, corticosteroids, allopurinol, febuxostat, probenecid, and biologic agents for refractory disease. Dosing should be adjusted for renal or hepatic impairment and patient age.
Follow-Up Disposition
Admission is indicated for suspected septic arthritis, acute renal failure, or intractable pain.
Patients without evidence of infection and with adequate pain control may be discharged.
Issues For Referral
Referral is indicated for septic arthritis, renal failure, or refractory disease.
Follow-Up Recommendations
Rheumatology follow-up is recommended for severe or difficult-to-control cases. Nephrology or urology referral is indicated for renal insufficiency or uric acid nephrolithiasis. Orthopedic follow-up is required for septic arthritis or significant joint damage. Patients should be counseled on a low-purine diet.
Key Clinical Insights And Frequent Errors
Septic arthritis may coexist with acute gout and must always be excluded. NSAIDs remain first-line therapy when tolerated. Acute attacks are often self-limited, but recurrent gout and pseudogout can result in progressive bony and cartilaginous damage if not appropriately managed.
Basics Description
Gout is a crystalline arthropathy caused by deposition of monosodium urate in tissues, most commonly affecting middle-aged men and postmenopausal women. It is the most common crystal-induced arthritis and classically progresses through four phases: asymptomatic hyperuricemia (serum urate >7 mg/dL), acute gout, intercritical gout with symptom-free intervals, and chronic tophaceous gout, which occurs in up to 45% of cases.
Risk factors include age >40 years, male sex (male-to-female ratio 2:1–6:1 before age 65, approaching 1:1 thereafter), hypertension, use of loop or thiazide diuretics, high intake of alcohol, meat, seafood, and fructose-sweetened beverages, and obesity. Uric acid nephrolithiasis may lead to renal dysfunction. Chronic disease can result in avascular necrosis and deforming arthritis.
Gout preferentially involves previously damaged tissues such as synovium, subchondral bone, bursae (olecranon, infrapatellar, prepatellar), Achilles tendon, and extensor surfaces of the forearms, toes, fingers, and ear. Rare involvement of the CNS or cardiac valves has been described.
Pseudogout is caused by calcium pyrophosphate crystal deposition and is the most common cause of acute monoarthritis in patients older than 60 years. Risk factors include hypercalcemia, hemochromatosis, hypothyroidism or hyperthyroidism, hypophosphatemia, hypomagnesemia, amyloidosis, and underlying gout.
Etiology
Gout results from deposition of monosodium urate crystals due to underexcretion (most common) or overproduction of uric acid. Acute attacks are often triggered by rapid changes in uric acid levels such as initiation or withdrawal of diuretics, alcohol intake, salicylates, niacin, cyclosporine, lead exposure, or starting uricosurics or allopurinol.
Pseudogout occurs due to excess accumulation of calcium pyrophosphate crystals within the synovium. Minor trauma and acute systemic illness, including surgery or ischemic heart disease, may precipitate attacks of either condition.
Diagnosis Signs And Symptoms
Both gout and pseudogout typically present as acute monoarticular or polyarticular arthritis with warmth, erythema, swelling, and pain. Early attacks often resolve spontaneously within 3–21 days, while later attacks may be longer, more severe, clustered, and polyarticular.
Gout symptoms usually peak within 12–24 hours. Tophi and skin desquamation may be present in advanced disease. Women often present after menopause and more commonly have polyarticular involvement. Presentations may be less dramatic in elderly or immunosuppressed patients. The first metatarsophalangeal joint is most commonly affected, followed by the ankle, knee, hand, and wrist.
Pseudogout more often involves large joints, particularly the knee, followed by the wrist, metacarpals, shoulder, elbow, ankle, hip, and tarsal joints. It may be monoarticular, asymptomatic, mimic osteoarthritis with symmetric degeneration, or present as a pseudorheumatoid arthritis variant with fever and confusion in elderly patients.
Essential Workup
Arthrocentesis with synovial fluid analysis is essential to confirm diagnosis and exclude infection. Aspirate should be examined for crystals, Gram stain, culture, leukocyte count, and differential. Gout fluid typically contains 20,000–100,000 WBC/mm³ without bacteria. Pseudogout fluid usually has fewer than 50,000 WBC/mm³.
Polarized light microscopy shows needle-shaped, strongly negatively birefringent crystals in gout and rhomboid-shaped, weakly positively birefringent crystals in pseudogout.
Diagnosis Tests And Interpretation
CBC often reveals leukocytosis. Chemistry panels assess renal function. Magnesium, calcium, TSH, and iron studies may identify associated conditions. Serum uric acid has limited diagnostic value during acute attacks. Blood and urine cultures are indicated if infection is suspected.
Plain radiographs may show soft tissue swelling in acute gout, while chronic gout demonstrates calcified tophi and characteristic erosions. Pseudogout may show chondrocalcinosis and calcification of cartilage or ligaments. Dual-energy CT can identify urate deposits or nephrolithiasis.
Differential Diagnosis
Septic arthritis, trauma, osteoarthritis, reactive arthritis, rheumatoid arthritis, systemic lupus erythematosus, avascular necrosis, osteomyelitis, sickle cell disease, and other crystal arthropathies.
Treatment Initial Stabilization Therapy
Primary goals are pain control and exclusion of infectious arthritis.
Ed Treatment Procedures
NSAIDs are first-line therapy if tolerated. If contraindicated or ineffective, corticosteroids (oral, IM, IV, or intra-articular) or colchicine may be used. Joint aspiration can provide symptomatic relief. Aspirin should be avoided.
Long-term urate-lowering therapy and prevention strategies are generally not initiated in the ED and include withdrawal of precipitating agents, uricosurics, allopurinol, hydration, urine alkalinization, and prophylactic colchicine or NSAIDs.
Medication
Therapeutic options include NSAIDs, colchicine, corticosteroids, allopurinol, febuxostat, probenecid, and biologic agents for refractory disease. Dosing should be adjusted for renal or hepatic impairment and patient age.
Follow-Up Disposition
Admission is indicated for suspected septic arthritis, acute renal failure, or intractable pain.
Patients without evidence of infection and with adequate pain control may be discharged.
Issues For Referral
Referral is indicated for septic arthritis, renal failure, or refractory disease.
Follow-Up Recommendations
Rheumatology follow-up is recommended for severe or difficult-to-control cases. Nephrology or urology referral is indicated for renal insufficiency or uric acid nephrolithiasis. Orthopedic follow-up is required for septic arthritis or significant joint damage. Patients should be counseled on a low-purine diet.
Key Clinical Insights And Frequent Errors
Septic arthritis may coexist with acute gout and must always be excluded. NSAIDs remain first-line therapy when tolerated. Acute attacks are often self-limited, but recurrent gout and pseudogout can result in progressive bony and cartilaginous damage if not appropriately managed.
- Published on
Emergency And Acute Medicine - Gonococcal Disease
Basics Description
Gonococcal disease is the second most frequently reported sexually transmitted infection in the United States, with an estimated 820,000 new cases annually and fewer than half reported. The highest incidence occurs in males and females aged 15–24 years, particularly among African Americans. Rates are increasing among men who have sex with men, especially those who are HIV-positive. Humans are the only known host. Coinfection with Chlamydia trachomatis is common. Infection may involve the urethra, rectum, cervical canal, pharynx, upper female genital tract, and conjunctiva. Urethritis is the most common presentation in men, while infection is often asymptomatic in women.
Etiology
The causative organism is Neisseria gonorrhoeae, a gram-negative aerobic diplococcus.
Diagnosis Signs And Symptoms
Cervicitis is defined by mucopurulent endocervical discharge or easily induced endocervical bleeding and is the most common site of infection. Up to 80% of women are asymptomatic, with nonspecific symptoms such as vaginal discharge, menorrhagia, pelvic pain, dyspareunia, urinary frequency, and dysuria.
Pelvic inflammatory disease develops in up to 20% of untreated cases, most commonly presenting with lower abdominal pain. Other symptoms include dyspareunia, abnormal bleeding or discharge, fever, and onset around menses. Fitz-Hugh–Curtis syndrome occurs in about 10% and presents with right upper quadrant pain. Bartholin abscess may also occur.
Urethritis typically has a 2–5 day incubation period and presents with penile discharge and dysuria; untreated cases may progress to prostatitis or epididymitis, which presents with acute unilateral testicular pain and swelling.
Proctitis is often asymptomatic and may be the only site of infection in many men who have sex with men. Rectal infection occurs in 35–50% of women with endocervical infection and significantly increases HIV acquisition risk. Symptoms include perianal pruritus, mucopurulent discharge, rectal bleeding, pain, tenesmus, and constipation.
Pharyngitis may present with sore throat or exudative tonsillitis.
Disseminated gonococcal infection occurs in 0.5–3% of untreated mucosal infections and presents with the triad of tenosynovitis, dermatitis, and polyarthralgia, often accompanied by fever, chills, and malaise. Dermatitis consists of tender necrotic pustules on an erythematous base. Septic arthritis typically affects the knee. Females are affected more commonly than males, with recent menstruation or pregnancy as risk factors. Rare complications include hepatitis, myocarditis, endocarditis, and meningitis.
Physical examination may reveal cervical friability and edema, uterine or adnexal tenderness in PID, and thick yellow-white urethral discharge with meatal erythema in urethritis.
Essential Workup
In symptomatic men, diagnosis is often clinical with Gram stain, which has high sensitivity. In women, cervical culture is recommended. Testing for chlamydia and syphilis should always be performed.
Diagnosis Tests And Interpretation
Cultures on Thayer-Martin medium remain the gold standard, particularly for blood and synovial fluid. Gram stain demonstrating intracellular gram-negative diplococci is highly sensitive in symptomatic men. Nucleic acid amplification tests using PCR are widely used for urethral, cervical, and urine specimens and frequently test for chlamydia concurrently. Pharyngeal and rectal cultures are indicated in symptomatic or high-risk patients.
In disseminated infection, synovial fluid typically shows neutrophilic leukocytosis, and multiple blood cultures should be obtained. Women with PID require CBC, urinalysis, pregnancy testing, and consideration of pelvic ultrasound to evaluate for tubo-ovarian abscess. Rapid plasma reagin testing is indicated to assess for syphilis.
Differential Diagnosis
Urethritis due to chlamydia, trichomonas, urinary tract infection, or syphilis; septic arthritis from other organisms; connective tissue diseases; poststreptococcal arthritis; viral infections; gout; HIV; secondary syphilis; and Lyme disease.
Treatment Ed Treatment Procedures
Provide IV fluids for dehydration or vomiting. Sexual partners should be treated, including expedited partner therapy where legally permitted. Patients are often treated empirically for chlamydial infection.
Uncomplicated cervical, urethral, or anorectal infection is treated with ceftriaxone 250 mg IM once plus azithromycin 1 g PO once or doxycycline 100 mg PO BID for 7 days.
Pelvic inflammatory disease may be treated as an outpatient with ceftriaxone or another third-generation cephalosporin plus doxycycline with or without metronidazole, or as an inpatient with IV cephalosporin-based or clindamycin-gentamicin regimens.
Pharyngitis is treated with ceftriaxone plus chlamydia coverage.
Epididymitis requires ceftriaxone plus doxycycline for 10 days.
Disseminated gonococcal infection is treated with ceftriaxone 1 g IV or IM daily, followed by oral therapy after clinical improvement.
Neonatal infections, conjunctivitis, meningitis, and endocarditis require weight-based or prolonged IV cephalosporin therapy. Severe cephalosporin allergy warrants infectious disease consultation.
Follow-Up Disposition
Admission is indicated for severe PID, pregnancy, inability to tolerate oral therapy, lack of response to outpatient treatment, tubo-ovarian abscess, or diagnostic uncertainty requiring surgical evaluation.
Patients with uncomplicated genital, pharyngeal, or conjunctival infection may be discharged after treatment.
Issues For Referral
Referral is indicated for infertility evaluation or recurrent infection despite appropriate therapy.
Key Clinical Insights And Common Errors
Always exclude testicular torsion in patients presenting with epididymitis. Disseminated gonococcal infection should be strongly considered in young, sexually active patients with acute, nontraumatic oligoarthritis or tenosynovitis, as delayed recognition can lead to significant morbidity.
Basics Description
Gonococcal disease is the second most frequently reported sexually transmitted infection in the United States, with an estimated 820,000 new cases annually and fewer than half reported. The highest incidence occurs in males and females aged 15–24 years, particularly among African Americans. Rates are increasing among men who have sex with men, especially those who are HIV-positive. Humans are the only known host. Coinfection with Chlamydia trachomatis is common. Infection may involve the urethra, rectum, cervical canal, pharynx, upper female genital tract, and conjunctiva. Urethritis is the most common presentation in men, while infection is often asymptomatic in women.
Etiology
The causative organism is Neisseria gonorrhoeae, a gram-negative aerobic diplococcus.
Diagnosis Signs And Symptoms
Cervicitis is defined by mucopurulent endocervical discharge or easily induced endocervical bleeding and is the most common site of infection. Up to 80% of women are asymptomatic, with nonspecific symptoms such as vaginal discharge, menorrhagia, pelvic pain, dyspareunia, urinary frequency, and dysuria.
Pelvic inflammatory disease develops in up to 20% of untreated cases, most commonly presenting with lower abdominal pain. Other symptoms include dyspareunia, abnormal bleeding or discharge, fever, and onset around menses. Fitz-Hugh–Curtis syndrome occurs in about 10% and presents with right upper quadrant pain. Bartholin abscess may also occur.
Urethritis typically has a 2–5 day incubation period and presents with penile discharge and dysuria; untreated cases may progress to prostatitis or epididymitis, which presents with acute unilateral testicular pain and swelling.
Proctitis is often asymptomatic and may be the only site of infection in many men who have sex with men. Rectal infection occurs in 35–50% of women with endocervical infection and significantly increases HIV acquisition risk. Symptoms include perianal pruritus, mucopurulent discharge, rectal bleeding, pain, tenesmus, and constipation.
Pharyngitis may present with sore throat or exudative tonsillitis.
Disseminated gonococcal infection occurs in 0.5–3% of untreated mucosal infections and presents with the triad of tenosynovitis, dermatitis, and polyarthralgia, often accompanied by fever, chills, and malaise. Dermatitis consists of tender necrotic pustules on an erythematous base. Septic arthritis typically affects the knee. Females are affected more commonly than males, with recent menstruation or pregnancy as risk factors. Rare complications include hepatitis, myocarditis, endocarditis, and meningitis.
Physical examination may reveal cervical friability and edema, uterine or adnexal tenderness in PID, and thick yellow-white urethral discharge with meatal erythema in urethritis.
Essential Workup
In symptomatic men, diagnosis is often clinical with Gram stain, which has high sensitivity. In women, cervical culture is recommended. Testing for chlamydia and syphilis should always be performed.
Diagnosis Tests And Interpretation
Cultures on Thayer-Martin medium remain the gold standard, particularly for blood and synovial fluid. Gram stain demonstrating intracellular gram-negative diplococci is highly sensitive in symptomatic men. Nucleic acid amplification tests using PCR are widely used for urethral, cervical, and urine specimens and frequently test for chlamydia concurrently. Pharyngeal and rectal cultures are indicated in symptomatic or high-risk patients.
In disseminated infection, synovial fluid typically shows neutrophilic leukocytosis, and multiple blood cultures should be obtained. Women with PID require CBC, urinalysis, pregnancy testing, and consideration of pelvic ultrasound to evaluate for tubo-ovarian abscess. Rapid plasma reagin testing is indicated to assess for syphilis.
Differential Diagnosis
Urethritis due to chlamydia, trichomonas, urinary tract infection, or syphilis; septic arthritis from other organisms; connective tissue diseases; poststreptococcal arthritis; viral infections; gout; HIV; secondary syphilis; and Lyme disease.
Treatment Ed Treatment Procedures
Provide IV fluids for dehydration or vomiting. Sexual partners should be treated, including expedited partner therapy where legally permitted. Patients are often treated empirically for chlamydial infection.
Uncomplicated cervical, urethral, or anorectal infection is treated with ceftriaxone 250 mg IM once plus azithromycin 1 g PO once or doxycycline 100 mg PO BID for 7 days.
Pelvic inflammatory disease may be treated as an outpatient with ceftriaxone or another third-generation cephalosporin plus doxycycline with or without metronidazole, or as an inpatient with IV cephalosporin-based or clindamycin-gentamicin regimens.
Pharyngitis is treated with ceftriaxone plus chlamydia coverage.
Epididymitis requires ceftriaxone plus doxycycline for 10 days.
Disseminated gonococcal infection is treated with ceftriaxone 1 g IV or IM daily, followed by oral therapy after clinical improvement.
Neonatal infections, conjunctivitis, meningitis, and endocarditis require weight-based or prolonged IV cephalosporin therapy. Severe cephalosporin allergy warrants infectious disease consultation.
Follow-Up Disposition
Admission is indicated for severe PID, pregnancy, inability to tolerate oral therapy, lack of response to outpatient treatment, tubo-ovarian abscess, or diagnostic uncertainty requiring surgical evaluation.
Patients with uncomplicated genital, pharyngeal, or conjunctival infection may be discharged after treatment.
Issues For Referral
Referral is indicated for infertility evaluation or recurrent infection despite appropriate therapy.
Key Clinical Insights And Common Errors
Always exclude testicular torsion in patients presenting with epididymitis. Disseminated gonococcal infection should be strongly considered in young, sexually active patients with acute, nontraumatic oligoarthritis or tenosynovitis, as delayed recognition can lead to significant morbidity.
- Published on
Emergency And Acute Medicine - Glomerulonephritis
Basics Description
Glomerulonephritis is a clinical syndrome characterized by hematuria, proteinuria, red blood cell casts, hypertension, and varying degrees of renal insufficiency. It represents a common final pathway of multiple disease processes that lead to intraglomerular inflammation and cellular proliferation. Contributing factors include genetic predisposition, infectious triggers, and rheumatologic or autoimmune conditions. Pathogenesis involves antibody deposition either by direct binding to glomerular antigens or deposition of circulating immune complexes, leading to activation of inflammatory mediators such as leukocytes, complement, and cytokines. Cell-mediated immune mechanisms further contribute to glomerular injury. Persistent inflammation may result in glomerular scarring and permanent renal damage.
Etiology
Postinfectious causes include poststreptococcal glomerulonephritis, which typically occurs 7–21 days after streptococcal pharyngitis or skin infection and is most common in children aged 2–14 years and in the elderly, with a male predominance. IgA nephropathy is common in men in the third and fourth decades and is often associated with increased IgA production following upper respiratory infections; Henoch–Schönlein purpura represents a systemic IgA-mediated disease affecting younger patients. Rapidly progressive glomerulonephritis can destroy renal function within days and is characterized by crescent formation in glomeruli. Pauci-immune vasculitides, often ANCA-positive, include granulomatosis with polyangiitis, microscopic polyangiitis, and eosinophilic granulomatosis with polyangiitis and may involve lungs or skin. Immune complex–mediated causes include postinfectious GN, endocarditis-associated GN, systemic lupus erythematosus, and Henoch–Schönlein purpura. Anti–glomerular basement membrane disease, such as Goodpasture syndrome, typically affects older adults and may involve pulmonary hemorrhage. Membranoproliferative glomerulonephritis is associated with complement deposition and conditions such as hepatitis C, non-Hodgkin lymphoma, or occult infection.
Diagnosis Signs And Symptoms
Core clinical features include hematuria, proteinuria, edema due to salt and water retention (periorbital edema, ascites, pleural effusions), hypertension, oliguria, azotemia, congestive heart failure, and renal failure. Nonspecific symptoms include fatigue, weight loss, abdominal pain, nausea, and vomiting. Autoimmune-related findings may include arthralgias, arthritis, rash, fever, and systemic inflammation. Goodpasture syndrome may present with hemoptysis. Granulomatosis with polyangiitis can cause purulent rhinorrhea, sinus pain, arthritis, and hemoptysis. Henoch–Schönlein purpura may present with abdominal pain, purpura, and arthritis.
In older adults, pauci-immune rapidly progressive glomerulonephritis is common and requires urgent diagnosis and biopsy due to high risk of progression to end-stage renal disease.
Essential Workup
Urinalysis is essential to identify hematuria, proteinuria, and red blood cell casts.
Diagnosis Tests And Interpretation
Laboratory evaluation includes electrolytes, BUN, creatinine, and GFR to assess renal function, as well as evaluation for hyperkalemia. Albumin and total protein levels may demonstrate hypoalbuminemia. CBC may show anemia related to chronic kidney disease, systemic illness, or pulmonary hemorrhage. Coagulation studies may be abnormal in select forms of GN. Additional tests guided by consultants include cultures, 24-hour urine protein measurement, antistreptolysin O titers, complement levels, ANA, ANCA, anti-GBM antibodies, ESR, CRP, hepatitis B and C serologies, and HIV testing.
Imaging may include renal ultrasound to assess kidney size and reversibility of disease and chest radiography to evaluate for pulmonary edema or hemorrhage.
Renal biopsy is the definitive diagnostic test to distinguish primary glomerular disease from secondary causes. Cystoscopy may be considered if bladder malignancy is suspected.
Differential Diagnosis
Hematologic disorders such as sickle cell disease and coagulopathies; renal causes including infection, malformation, neoplasm, ischemia, trauma, and vasculitis; postrenal causes such as obstruction or reflux; inflammatory genitourinary conditions; pigmenturia; factitious hematuria; and vaginal bleeding.
Treatment Pre Hospital
Provide supportive care with attention to airway, breathing, and circulation. Restrict fluids in stable patients with significant edema.
Initial Stabilization Therapy
Stabilize airway, breathing, and circulation.
Ed Treatment Procedures
Management is largely supportive and includes strict blood pressure control with a target below 125/75 mm Hg, loop diuretics for volume overload, and ACE inhibitors for maintenance therapy. Dialysis is indicated for fluid overload, hyperkalemia, or uremia.
Poststreptococcal glomerulonephritis is treated with supportive care and typically resolves spontaneously; antibiotics do not alter renal outcomes.
IgA nephropathy is managed supportively, with immunosuppressive therapy considered when biopsy shows active inflammation.
Rapidly progressive glomerulonephritis requires emergent nephrology consultation and early initiation of immunosuppressive therapy due to the risk of irreversible renal failure.
Membranoproliferative glomerulonephritis management focuses on treating underlying disease and may include plasma exchange, immunosuppressants, and steroids.
Medication
Therapeutic agents may include ACE inhibitors such as benazepril, loop diuretics such as furosemide, corticosteroids including methylprednisolone and prednisone, immunosuppressants such as cyclophosphamide or rituximab, vasodilators for hypertensive emergencies, and renal replacement therapy when indicated.
Follow-Up Disposition
Admission is required for patients with unstable vital signs, oliguria or anuria, uremia, acute renal failure, significant electrolyte abnormalities, hypertensive emergencies, congestive heart failure, or infectious causes of glomerulonephritis.
Selected patients with mild hematuria and proteinuria, stable vitals, no infection, and otherwise normal laboratory findings may be discharged with close follow-up.
Follow-Up Recommendations
All patients with glomerulonephritis require nephrology follow-up for monitoring, definitive diagnosis, and long-term management.
Key Clinical Insights And Avoidable Errors
Early nephrology consultation is critical when immunosuppressive therapy is being considered. Any finding of hematuria or proteinuria warrants appropriate follow-up, as progression to clinically significant glomerulonephritis may occur if overlooked.
Basics Description
Glomerulonephritis is a clinical syndrome characterized by hematuria, proteinuria, red blood cell casts, hypertension, and varying degrees of renal insufficiency. It represents a common final pathway of multiple disease processes that lead to intraglomerular inflammation and cellular proliferation. Contributing factors include genetic predisposition, infectious triggers, and rheumatologic or autoimmune conditions. Pathogenesis involves antibody deposition either by direct binding to glomerular antigens or deposition of circulating immune complexes, leading to activation of inflammatory mediators such as leukocytes, complement, and cytokines. Cell-mediated immune mechanisms further contribute to glomerular injury. Persistent inflammation may result in glomerular scarring and permanent renal damage.
Etiology
Postinfectious causes include poststreptococcal glomerulonephritis, which typically occurs 7–21 days after streptococcal pharyngitis or skin infection and is most common in children aged 2–14 years and in the elderly, with a male predominance. IgA nephropathy is common in men in the third and fourth decades and is often associated with increased IgA production following upper respiratory infections; Henoch–Schönlein purpura represents a systemic IgA-mediated disease affecting younger patients. Rapidly progressive glomerulonephritis can destroy renal function within days and is characterized by crescent formation in glomeruli. Pauci-immune vasculitides, often ANCA-positive, include granulomatosis with polyangiitis, microscopic polyangiitis, and eosinophilic granulomatosis with polyangiitis and may involve lungs or skin. Immune complex–mediated causes include postinfectious GN, endocarditis-associated GN, systemic lupus erythematosus, and Henoch–Schönlein purpura. Anti–glomerular basement membrane disease, such as Goodpasture syndrome, typically affects older adults and may involve pulmonary hemorrhage. Membranoproliferative glomerulonephritis is associated with complement deposition and conditions such as hepatitis C, non-Hodgkin lymphoma, or occult infection.
Diagnosis Signs And Symptoms
Core clinical features include hematuria, proteinuria, edema due to salt and water retention (periorbital edema, ascites, pleural effusions), hypertension, oliguria, azotemia, congestive heart failure, and renal failure. Nonspecific symptoms include fatigue, weight loss, abdominal pain, nausea, and vomiting. Autoimmune-related findings may include arthralgias, arthritis, rash, fever, and systemic inflammation. Goodpasture syndrome may present with hemoptysis. Granulomatosis with polyangiitis can cause purulent rhinorrhea, sinus pain, arthritis, and hemoptysis. Henoch–Schönlein purpura may present with abdominal pain, purpura, and arthritis.
In older adults, pauci-immune rapidly progressive glomerulonephritis is common and requires urgent diagnosis and biopsy due to high risk of progression to end-stage renal disease.
Essential Workup
Urinalysis is essential to identify hematuria, proteinuria, and red blood cell casts.
Diagnosis Tests And Interpretation
Laboratory evaluation includes electrolytes, BUN, creatinine, and GFR to assess renal function, as well as evaluation for hyperkalemia. Albumin and total protein levels may demonstrate hypoalbuminemia. CBC may show anemia related to chronic kidney disease, systemic illness, or pulmonary hemorrhage. Coagulation studies may be abnormal in select forms of GN. Additional tests guided by consultants include cultures, 24-hour urine protein measurement, antistreptolysin O titers, complement levels, ANA, ANCA, anti-GBM antibodies, ESR, CRP, hepatitis B and C serologies, and HIV testing.
Imaging may include renal ultrasound to assess kidney size and reversibility of disease and chest radiography to evaluate for pulmonary edema or hemorrhage.
Renal biopsy is the definitive diagnostic test to distinguish primary glomerular disease from secondary causes. Cystoscopy may be considered if bladder malignancy is suspected.
Differential Diagnosis
Hematologic disorders such as sickle cell disease and coagulopathies; renal causes including infection, malformation, neoplasm, ischemia, trauma, and vasculitis; postrenal causes such as obstruction or reflux; inflammatory genitourinary conditions; pigmenturia; factitious hematuria; and vaginal bleeding.
Treatment Pre Hospital
Provide supportive care with attention to airway, breathing, and circulation. Restrict fluids in stable patients with significant edema.
Initial Stabilization Therapy
Stabilize airway, breathing, and circulation.
Ed Treatment Procedures
Management is largely supportive and includes strict blood pressure control with a target below 125/75 mm Hg, loop diuretics for volume overload, and ACE inhibitors for maintenance therapy. Dialysis is indicated for fluid overload, hyperkalemia, or uremia.
Poststreptococcal glomerulonephritis is treated with supportive care and typically resolves spontaneously; antibiotics do not alter renal outcomes.
IgA nephropathy is managed supportively, with immunosuppressive therapy considered when biopsy shows active inflammation.
Rapidly progressive glomerulonephritis requires emergent nephrology consultation and early initiation of immunosuppressive therapy due to the risk of irreversible renal failure.
Membranoproliferative glomerulonephritis management focuses on treating underlying disease and may include plasma exchange, immunosuppressants, and steroids.
Medication
Therapeutic agents may include ACE inhibitors such as benazepril, loop diuretics such as furosemide, corticosteroids including methylprednisolone and prednisone, immunosuppressants such as cyclophosphamide or rituximab, vasodilators for hypertensive emergencies, and renal replacement therapy when indicated.
Follow-Up Disposition
Admission is required for patients with unstable vital signs, oliguria or anuria, uremia, acute renal failure, significant electrolyte abnormalities, hypertensive emergencies, congestive heart failure, or infectious causes of glomerulonephritis.
Selected patients with mild hematuria and proteinuria, stable vitals, no infection, and otherwise normal laboratory findings may be discharged with close follow-up.
Follow-Up Recommendations
All patients with glomerulonephritis require nephrology follow-up for monitoring, definitive diagnosis, and long-term management.
Key Clinical Insights And Avoidable Errors
Early nephrology consultation is critical when immunosuppressive therapy is being considered. Any finding of hematuria or proteinuria warrants appropriate follow-up, as progression to clinically significant glomerulonephritis may occur if overlooked.
- Published on
Emergency And Acute Medicine - Globe Rupture
Basics Description
A globe rupture is a full-thickness injury of the cornea or sclera caused by trauma. Blunt trauma results in a sudden diffuse rise in intraocular pressure, leading to rupture at the weakest points of the eye such as the extraocular muscle insertions, corneoscleral junction, or limbus where the sclera is thinnest. Penetrating injuries occur when sharp objects or projectiles directly lacerate the sclera or anterior eye and are most commonly anterior due to protection from the bony orbit. Posterior injuries may occur with orbital fractures or penetrating trauma through the eyelid or eyebrow. Prognosis is worse with large lacerations, injuries posterior to rectus muscle insertions, blunt mechanisms, intraocular foreign bodies (especially organic), vitreous extrusion, lens damage, hyphema, retinal detachment, poor initial visual acuity, afferent pupillary defect, and delays to operative repair.
Etiology
Common causes include falls, blunt impact injuries, sports-related trauma, indirect concussive injuries such as explosions, sharp or stabbing injuries (accidental or intentional), and projectile injuries from industrial accidents, firearms, BB pellets, or blast-related shrapnel such as glass.
Diagnosis Signs And Symptoms
Patients may present with eye pain, localized swelling and ecchymosis, scleral or corneal laceration, extrusion of intraocular contents, markedly decreased visual acuity, restricted extraocular movements, hyphema, severe circumferential subconjunctival hemorrhage with bloody chemosis, abnormally deep or shallow anterior chamber, irregular pupil pointing toward the lesion, lens subluxation, commotio retinae, and low intraocular pressure. Tonometry should not be performed if globe rupture is suspected.
History
Assessment should include the mechanism of injury, concern for retained intraocular foreign body, prior eye surgery, preinjury visual acuity, tetanus status, and time of last oral intake.
Physical Exam
A careful penlight or slit-lamp examination should be performed to look for signs of rupture. Once a globe rupture is suspected or identified, further ocular examination should be deferred until surgical repair to avoid pressure on the eye and extrusion of contents. If rupture is excluded, a full ophthalmologic exam including visual acuity, slit-lamp evaluation, fundus exam, Seidel test, and intraocular pressure measurement may be performed. Ultrasound should only be used if rupture is not suspected.
Essential Workup
If globe rupture is suspected or confirmed, minimize examination and manipulation of the eye until operative repair.
Diagnosis Tests And Interpretation
Preoperative laboratory studies include CBC, electrolytes, and coagulation tests. Imaging may include orbital radiographs to identify metallic foreign bodies and CT of the orbits with axial and coronal views. MRI is contraindicated until metallic foreign bodies are excluded. B-scan ultrasound may be used only when rupture is not suspected.
Differential Diagnosis
Intraocular foreign body, hyphema, severe subconjunctival hemorrhage with chemosis, partial corneal laceration, and partial scleral laceration.
Treatment Pre Hospital
Place a rigid eye shield without applying pressure to the globe. If no shield is available, a protective cup may be used.
Initial Stabilization Therapy
Avoid manipulation of the eye and prevent activities that increase intraocular pressure such as coughing, vomiting, or straining.
Ed Treatment Procedures
Immediate ophthalmologic consultation is required for surgical management. Maintain NPO status, elevate the head of the bed, provide antiemetics, and apply a protective eye shield without pressure. Update tetanus immunization. Administer broad-spectrum IV antibiotics targeting skin flora and injury-specific contaminants, commonly vancomycin with ceftazidime or ciprofloxacin. Identify and manage associated injuries. Succinylcholine is relatively contraindicated but may be used with appropriate precautions if necessary for airway control.
In pediatric patients, consider nonaccidental trauma and minimize crying or agitation to prevent extrusion of ocular contents.
Medication
Commonly used agents include vancomycin, ceftazidime, ciprofloxacin, clindamycin, tobramycin, and antiemetics such as ondansetron or prochlorperazine.
Follow-Up Disposition
All patients with globe rupture or penetrating eye injury require admission. Discharge is appropriate only if globe penetration has been definitively excluded.
Issues For Referral
Emergent ophthalmologic consultation is essential, as delays increase the risk of infection and poor visual outcomes. Patients should be counseled on protective eyewear to prevent recurrence when appropriate.
Follow-Up Recommendations
Postoperative follow-up with ophthalmology is mandatory.
Key Clinical Insights And Avoidable Errors
Do not manipulate the eye when globe rupture is suspected or confirmed. Always place a protective eye shield without pressure. Treat nausea and vomiting aggressively to prevent increases in intraocular pressure. Ensure tetanus prophylaxis and initiate empiric antibiotics tailored to the injury mechanism promptly.
Basics Description
A globe rupture is a full-thickness injury of the cornea or sclera caused by trauma. Blunt trauma results in a sudden diffuse rise in intraocular pressure, leading to rupture at the weakest points of the eye such as the extraocular muscle insertions, corneoscleral junction, or limbus where the sclera is thinnest. Penetrating injuries occur when sharp objects or projectiles directly lacerate the sclera or anterior eye and are most commonly anterior due to protection from the bony orbit. Posterior injuries may occur with orbital fractures or penetrating trauma through the eyelid or eyebrow. Prognosis is worse with large lacerations, injuries posterior to rectus muscle insertions, blunt mechanisms, intraocular foreign bodies (especially organic), vitreous extrusion, lens damage, hyphema, retinal detachment, poor initial visual acuity, afferent pupillary defect, and delays to operative repair.
Etiology
Common causes include falls, blunt impact injuries, sports-related trauma, indirect concussive injuries such as explosions, sharp or stabbing injuries (accidental or intentional), and projectile injuries from industrial accidents, firearms, BB pellets, or blast-related shrapnel such as glass.
Diagnosis Signs And Symptoms
Patients may present with eye pain, localized swelling and ecchymosis, scleral or corneal laceration, extrusion of intraocular contents, markedly decreased visual acuity, restricted extraocular movements, hyphema, severe circumferential subconjunctival hemorrhage with bloody chemosis, abnormally deep or shallow anterior chamber, irregular pupil pointing toward the lesion, lens subluxation, commotio retinae, and low intraocular pressure. Tonometry should not be performed if globe rupture is suspected.
History
Assessment should include the mechanism of injury, concern for retained intraocular foreign body, prior eye surgery, preinjury visual acuity, tetanus status, and time of last oral intake.
Physical Exam
A careful penlight or slit-lamp examination should be performed to look for signs of rupture. Once a globe rupture is suspected or identified, further ocular examination should be deferred until surgical repair to avoid pressure on the eye and extrusion of contents. If rupture is excluded, a full ophthalmologic exam including visual acuity, slit-lamp evaluation, fundus exam, Seidel test, and intraocular pressure measurement may be performed. Ultrasound should only be used if rupture is not suspected.
Essential Workup
If globe rupture is suspected or confirmed, minimize examination and manipulation of the eye until operative repair.
Diagnosis Tests And Interpretation
Preoperative laboratory studies include CBC, electrolytes, and coagulation tests. Imaging may include orbital radiographs to identify metallic foreign bodies and CT of the orbits with axial and coronal views. MRI is contraindicated until metallic foreign bodies are excluded. B-scan ultrasound may be used only when rupture is not suspected.
Differential Diagnosis
Intraocular foreign body, hyphema, severe subconjunctival hemorrhage with chemosis, partial corneal laceration, and partial scleral laceration.
Treatment Pre Hospital
Place a rigid eye shield without applying pressure to the globe. If no shield is available, a protective cup may be used.
Initial Stabilization Therapy
Avoid manipulation of the eye and prevent activities that increase intraocular pressure such as coughing, vomiting, or straining.
Ed Treatment Procedures
Immediate ophthalmologic consultation is required for surgical management. Maintain NPO status, elevate the head of the bed, provide antiemetics, and apply a protective eye shield without pressure. Update tetanus immunization. Administer broad-spectrum IV antibiotics targeting skin flora and injury-specific contaminants, commonly vancomycin with ceftazidime or ciprofloxacin. Identify and manage associated injuries. Succinylcholine is relatively contraindicated but may be used with appropriate precautions if necessary for airway control.
In pediatric patients, consider nonaccidental trauma and minimize crying or agitation to prevent extrusion of ocular contents.
Medication
Commonly used agents include vancomycin, ceftazidime, ciprofloxacin, clindamycin, tobramycin, and antiemetics such as ondansetron or prochlorperazine.
Follow-Up Disposition
All patients with globe rupture or penetrating eye injury require admission. Discharge is appropriate only if globe penetration has been definitively excluded.
Issues For Referral
Emergent ophthalmologic consultation is essential, as delays increase the risk of infection and poor visual outcomes. Patients should be counseled on protective eyewear to prevent recurrence when appropriate.
Follow-Up Recommendations
Postoperative follow-up with ophthalmology is mandatory.
Key Clinical Insights And Avoidable Errors
Do not manipulate the eye when globe rupture is suspected or confirmed. Always place a protective eye shield without pressure. Treat nausea and vomiting aggressively to prevent increases in intraocular pressure. Ensure tetanus prophylaxis and initiate empiric antibiotics tailored to the injury mechanism promptly.
