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Emergency And Acute Medicine – Fournier Gangrene
Basics Description
Inadequate hygiene can lead to maceration and excoriation of scrotal skin, creating a portal of entry for bacteria. Once the skin barrier is disrupted, polymicrobial organisms spread rapidly along fascial planes of the perineum. Colles fascia fuses with the urogenital diaphragm, limiting posterior and lateral spread, while continuity of Buck and Scarpa fascia allows rapid anterior extension to the abdominal wall and lateral spread along the fascia lata. The testes and urethra are typically spared.
Most cases originate from three anatomic sources: lower urinary tract infections such as urethral strictures or indwelling catheters, penile or scrotal sources including condom catheters, hidradenitis, or balanitis, and anorectal sources such as fistulas, perirectal infections, or hemorrhoids. Rarely, intra-abdominal pathology including perforated appendicitis, diverticulitis, or pancreatitis may spread contiguously.
Etiology
Fournier gangrene is caused by polymicrobial infection involving mixed aerobic and anaerobic organisms that act synergistically to destroy tissue. End-arterial thrombosis in subcutaneous tissues creates an anaerobic environment that promotes rapid progression. Bacterial toxins and tissue necrosis factors contribute to systemic toxicity. Predisposing risk factors include trauma, diabetes mellitus, alcoholism, immunocompromised states, morbid obesity, and recent abdominal surgery.
Diagnosis Signs And Symptoms
This condition is a rapidly progressive necrotizing infection of the perineum involving subcutaneous tissue, fascia, and often muscle. It most commonly affects diabetic or immunocompromised patients. Early pain is often severe and out of proportion to physical findings; as necrosis progresses, affected tissue may become insensate. Associated symptoms include fever, chills, nausea, vomiting, urinary symptoms, lethargy, and inappropriate indifference to illness.
On examination, patients are often toxic appearing. Findings may include bronze or violaceous skin discoloration, thin brown malodorous discharge, ulceration, bullae, crepitus from subcutaneous air, frank necrosis, and eschar formation.
Essential Workup
Fournier gangrene is primarily a clinical diagnosis. A thorough history and focused examination of the perineum are critical. Evaluation for sepsis is mandatory, and early surgical consultation for emergent débridement is essential. Additional assessment should address underlying comorbidities such as diabetes or immunosuppression.
Diagnosis Tests And Interpretation
No laboratory test is diagnostic, but supportive findings include leukocytosis, anemia, electrolyte abnormalities, metabolic acidosis, renal failure, and possible disseminated intravascular coagulation. Urinalysis should be obtained. If diabetes is suspected or known, serum glucose, electrolytes, and ketones should be checked to evaluate for diabetic ketoacidosis. Blood, urine, and tissue cultures should be obtained when possible.
Imaging may show subcutaneous emphysema or ileus on plain pelvic radiographs. CT imaging is helpful when an intra-abdominal or ischiorectal source is suspected. Ultrasound may assist in differentiating Fournier gangrene from other causes of acute scrotum.
Differential Diagnosis
Epididymitis or orchitis, insect or human bites, perirectal infections, scrotal or inguinal abscess, scrotal cellulitis, testicular torsion, and tinea cruris.
Treatment
Prehospital care focuses on early recognition of septic shock with aggressive fluid resuscitation and vasopressor support if needed. Initial stabilization includes airway management, hemodynamic resuscitation, and avoidance of femoral venous access when possible.
Emergency department management requires immediate broad-spectrum intravenous antibiotics and emergent aggressive surgical débridement. Adjunctive hyperbaric oxygen therapy may be considered in coordination with surgical teams. Metabolic derangements, dehydration, anemia, and coagulopathy should be corrected, and tetanus prophylaxis administered as indicated.
Medication
Empiric antibiotic therapy should provide broad aerobic and anaerobic coverage and include agents such as ampicillin with clindamycin and gentamicin, or single-agent regimens like piperacillin–tazobactam, ampicillin–sulbactam, or carbapenems. Coverage for methicillin-resistant Staphylococcus aureus with vancomycin should be added when indicated. Insulin therapy is required for glycemic control, and vasopressors may be necessary for persistent hypotension.
Follow Up Disposition
All patients with Fournier gangrene require admission to a surgical intensive care unit. Mortality remains high despite treatment, emphasizing the importance of early recognition and aggressive management. Transfer to a facility capable of providing hyperbaric oxygen therapy should be considered when appropriate.
Key Practice Insights And Common Pitfalls
Failure to perform a careful genital and perineal examination can delay diagnosis. Delayed initiation of broad-spectrum antibiotics and surgical consultation significantly worsens outcomes. Early suspicion, prompt antibiotics, and immediate surgical intervention are critical to survival.
Basics Description
Inadequate hygiene can lead to maceration and excoriation of scrotal skin, creating a portal of entry for bacteria. Once the skin barrier is disrupted, polymicrobial organisms spread rapidly along fascial planes of the perineum. Colles fascia fuses with the urogenital diaphragm, limiting posterior and lateral spread, while continuity of Buck and Scarpa fascia allows rapid anterior extension to the abdominal wall and lateral spread along the fascia lata. The testes and urethra are typically spared.
Most cases originate from three anatomic sources: lower urinary tract infections such as urethral strictures or indwelling catheters, penile or scrotal sources including condom catheters, hidradenitis, or balanitis, and anorectal sources such as fistulas, perirectal infections, or hemorrhoids. Rarely, intra-abdominal pathology including perforated appendicitis, diverticulitis, or pancreatitis may spread contiguously.
Etiology
Fournier gangrene is caused by polymicrobial infection involving mixed aerobic and anaerobic organisms that act synergistically to destroy tissue. End-arterial thrombosis in subcutaneous tissues creates an anaerobic environment that promotes rapid progression. Bacterial toxins and tissue necrosis factors contribute to systemic toxicity. Predisposing risk factors include trauma, diabetes mellitus, alcoholism, immunocompromised states, morbid obesity, and recent abdominal surgery.
Diagnosis Signs And Symptoms
This condition is a rapidly progressive necrotizing infection of the perineum involving subcutaneous tissue, fascia, and often muscle. It most commonly affects diabetic or immunocompromised patients. Early pain is often severe and out of proportion to physical findings; as necrosis progresses, affected tissue may become insensate. Associated symptoms include fever, chills, nausea, vomiting, urinary symptoms, lethargy, and inappropriate indifference to illness.
On examination, patients are often toxic appearing. Findings may include bronze or violaceous skin discoloration, thin brown malodorous discharge, ulceration, bullae, crepitus from subcutaneous air, frank necrosis, and eschar formation.
Essential Workup
Fournier gangrene is primarily a clinical diagnosis. A thorough history and focused examination of the perineum are critical. Evaluation for sepsis is mandatory, and early surgical consultation for emergent débridement is essential. Additional assessment should address underlying comorbidities such as diabetes or immunosuppression.
Diagnosis Tests And Interpretation
No laboratory test is diagnostic, but supportive findings include leukocytosis, anemia, electrolyte abnormalities, metabolic acidosis, renal failure, and possible disseminated intravascular coagulation. Urinalysis should be obtained. If diabetes is suspected or known, serum glucose, electrolytes, and ketones should be checked to evaluate for diabetic ketoacidosis. Blood, urine, and tissue cultures should be obtained when possible.
Imaging may show subcutaneous emphysema or ileus on plain pelvic radiographs. CT imaging is helpful when an intra-abdominal or ischiorectal source is suspected. Ultrasound may assist in differentiating Fournier gangrene from other causes of acute scrotum.
Differential Diagnosis
Epididymitis or orchitis, insect or human bites, perirectal infections, scrotal or inguinal abscess, scrotal cellulitis, testicular torsion, and tinea cruris.
Treatment
Prehospital care focuses on early recognition of septic shock with aggressive fluid resuscitation and vasopressor support if needed. Initial stabilization includes airway management, hemodynamic resuscitation, and avoidance of femoral venous access when possible.
Emergency department management requires immediate broad-spectrum intravenous antibiotics and emergent aggressive surgical débridement. Adjunctive hyperbaric oxygen therapy may be considered in coordination with surgical teams. Metabolic derangements, dehydration, anemia, and coagulopathy should be corrected, and tetanus prophylaxis administered as indicated.
Medication
Empiric antibiotic therapy should provide broad aerobic and anaerobic coverage and include agents such as ampicillin with clindamycin and gentamicin, or single-agent regimens like piperacillin–tazobactam, ampicillin–sulbactam, or carbapenems. Coverage for methicillin-resistant Staphylococcus aureus with vancomycin should be added when indicated. Insulin therapy is required for glycemic control, and vasopressors may be necessary for persistent hypotension.
Follow Up Disposition
All patients with Fournier gangrene require admission to a surgical intensive care unit. Mortality remains high despite treatment, emphasizing the importance of early recognition and aggressive management. Transfer to a facility capable of providing hyperbaric oxygen therapy should be considered when appropriate.
Key Practice Insights And Common Pitfalls
Failure to perform a careful genital and perineal examination can delay diagnosis. Delayed initiation of broad-spectrum antibiotics and surgical consultation significantly worsens outcomes. Early suspicion, prompt antibiotics, and immediate surgical intervention are critical to survival.
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Emergency And Acute Medicine – Frostbite
Basics Description
Frostbite is tissue injury caused by exposure to cold temperatures. Tissue damage occurs through direct cellular injury from intracellular ice crystal formation, indirect injury from extracellular ice crystals causing cellular dehydration and enzymatic disruption, and reperfusion injury during rewarming. Reperfusion leads to release of inflammatory mediators such as prostaglandins and thromboxane, resulting in vasoconstriction, platelet aggregation, endothelial injury, and thrombosis. Clear blisters result from extracellular fluid exudation, while hemorrhagic blisters indicate deeper vascular injury. Progressive arterial thrombosis leads to ischemia and necrosis. Tissue demarcation evolves over weeks to months, leading to delayed definitive surgical decisions.
Etiology
Cold exposure severity depends on duration, wind chill, humidity, and wet skin or clothing. Predisposing factors include extremes of age, altered mental status from intoxication or psychiatric illness, and impaired circulation.
Diagnosis Signs And Symptoms
Fingers, toes, ears, and nose are most commonly affected. Classification after rewarming helps describe injury severity but does not change initial management.
Superficial frostbite involves skin only and usually heals without tissue loss. First-degree injuries present with erythema, edema, burning, and throbbing without blisters. Second-degree injuries cause marked edema, clear blisters, and numbness.
Deep frostbite results in inevitable tissue loss. Third-degree injuries involve subcutaneous tissue with hemorrhagic blisters and severe pain after rewarming. Fourth-degree injuries extend to muscle, tendon, and bone with deep cyanosis, mottling, or anesthesia. Poor prognostic signs include hemorrhagic blisters, persistent cyanosis, mottling, anesthesia, and impaired mobility after rewarming.
Essential Workup
Diagnosis is clinical. Document skin color, temperature, blister type, and tissue consistency. Perform vascular and neurologic exams including pulses, Doppler assessment, capillary refill, and two-point discrimination. Evaluate for associated conditions such as hypothermia, trauma, hypoglycemia, intoxication, cardiac or neurologic illness, and compartment syndrome.
Diagnosis Tests And Interpretation
Lab
Not required for mild cases. Severe frostbite may require CBC, electrolytes, renal function, glucose, creatine kinase, urinalysis for myoglobinuria, and cultures if infection is suspected.
Imaging
Technetium-99 scintigraphy or MR angiography may help identify viable tissue early and guide surgical planning.
Diagnostic Procedures
Rapid rewarming is performed using a water bath maintained at 40–42°C. Temperatures outside this range increase risk of thermal injury or worsen tissue loss.
Differential Diagnosis
Frostnip causes reversible numbness without tissue injury. Trench foot results from prolonged wet cold exposure without ice crystal formation and presents with neurovascular compromise. Chilblains occur with chronic cold exposure and present as erythematous or cyanotic plaques.
Treatment Prehospital
Protect and immobilize affected areas. Remove wet or constrictive clothing. Avoid rubbing, massage, snow application, or dry rewarming if refreezing is possible. Treat hypothermia cautiously to prevent arrhythmias.
Initial Stabilization Therapy
Address airway, breathing, and circulation. Correct hypothermia. Provide IV fluids for severe cases. Minimize handling of frozen tissue.
ED Treatment Procedures
If injury is recent and not rewarmed, initiate rapid rewarming in a 40–42°C water bath for 15–30 minutes until tissue is pliable and erythematous. Provide aggressive analgesia with opioids and NSAIDs. Apply topical aloe vera to intact skin. Debride or aspirate clear blisters but avoid hemorrhagic blister intervention. Provide tetanus prophylaxis. Consider short-term antibiotics during hyperemic recovery for severe injuries. Elevate and splint affected areas and change dressings frequently. Avoid vasoconstrictive agents including nicotine. Thrombolytic therapy within 24 hours may improve tissue salvage and requires specialist consultation.
Medication
Aloe vera topical cream applied every 6 hours.
Ibuprofen 800 mg PO TID (pediatric dosing weight-based).
Morphine sulfate titrated IV or IM for pain control.
Antibiotics such as cephalexin, dicloxacillin, or ciprofloxacin when indicated.
Follow Up Disposition
Admission Criteria
All but minimal superficial injuries should be admitted, especially when refreezing risk exists.
Discharge Criteria
Only very mild superficial frostbite with reliable follow-up.
Issues For Referral
Consult burn, plastic, hand, or general surgery for all but the mildest cases.
Key Practice Insights And Common Pitfalls
Avoid freeze–thaw–refreeze cycles. Maintain correct rewarming temperature. Always address hypothermia and systemic illness. Consider compartment syndrome in pulseless or tense extremities.
Basics Description
Frostbite is tissue injury caused by exposure to cold temperatures. Tissue damage occurs through direct cellular injury from intracellular ice crystal formation, indirect injury from extracellular ice crystals causing cellular dehydration and enzymatic disruption, and reperfusion injury during rewarming. Reperfusion leads to release of inflammatory mediators such as prostaglandins and thromboxane, resulting in vasoconstriction, platelet aggregation, endothelial injury, and thrombosis. Clear blisters result from extracellular fluid exudation, while hemorrhagic blisters indicate deeper vascular injury. Progressive arterial thrombosis leads to ischemia and necrosis. Tissue demarcation evolves over weeks to months, leading to delayed definitive surgical decisions.
Etiology
Cold exposure severity depends on duration, wind chill, humidity, and wet skin or clothing. Predisposing factors include extremes of age, altered mental status from intoxication or psychiatric illness, and impaired circulation.
Diagnosis Signs And Symptoms
Fingers, toes, ears, and nose are most commonly affected. Classification after rewarming helps describe injury severity but does not change initial management.
Superficial frostbite involves skin only and usually heals without tissue loss. First-degree injuries present with erythema, edema, burning, and throbbing without blisters. Second-degree injuries cause marked edema, clear blisters, and numbness.
Deep frostbite results in inevitable tissue loss. Third-degree injuries involve subcutaneous tissue with hemorrhagic blisters and severe pain after rewarming. Fourth-degree injuries extend to muscle, tendon, and bone with deep cyanosis, mottling, or anesthesia. Poor prognostic signs include hemorrhagic blisters, persistent cyanosis, mottling, anesthesia, and impaired mobility after rewarming.
Essential Workup
Diagnosis is clinical. Document skin color, temperature, blister type, and tissue consistency. Perform vascular and neurologic exams including pulses, Doppler assessment, capillary refill, and two-point discrimination. Evaluate for associated conditions such as hypothermia, trauma, hypoglycemia, intoxication, cardiac or neurologic illness, and compartment syndrome.
Diagnosis Tests And Interpretation
Lab
Not required for mild cases. Severe frostbite may require CBC, electrolytes, renal function, glucose, creatine kinase, urinalysis for myoglobinuria, and cultures if infection is suspected.
Imaging
Technetium-99 scintigraphy or MR angiography may help identify viable tissue early and guide surgical planning.
Diagnostic Procedures
Rapid rewarming is performed using a water bath maintained at 40–42°C. Temperatures outside this range increase risk of thermal injury or worsen tissue loss.
Differential Diagnosis
Frostnip causes reversible numbness without tissue injury. Trench foot results from prolonged wet cold exposure without ice crystal formation and presents with neurovascular compromise. Chilblains occur with chronic cold exposure and present as erythematous or cyanotic plaques.
Treatment Prehospital
Protect and immobilize affected areas. Remove wet or constrictive clothing. Avoid rubbing, massage, snow application, or dry rewarming if refreezing is possible. Treat hypothermia cautiously to prevent arrhythmias.
Initial Stabilization Therapy
Address airway, breathing, and circulation. Correct hypothermia. Provide IV fluids for severe cases. Minimize handling of frozen tissue.
ED Treatment Procedures
If injury is recent and not rewarmed, initiate rapid rewarming in a 40–42°C water bath for 15–30 minutes until tissue is pliable and erythematous. Provide aggressive analgesia with opioids and NSAIDs. Apply topical aloe vera to intact skin. Debride or aspirate clear blisters but avoid hemorrhagic blister intervention. Provide tetanus prophylaxis. Consider short-term antibiotics during hyperemic recovery for severe injuries. Elevate and splint affected areas and change dressings frequently. Avoid vasoconstrictive agents including nicotine. Thrombolytic therapy within 24 hours may improve tissue salvage and requires specialist consultation.
Medication
Aloe vera topical cream applied every 6 hours.
Ibuprofen 800 mg PO TID (pediatric dosing weight-based).
Morphine sulfate titrated IV or IM for pain control.
Antibiotics such as cephalexin, dicloxacillin, or ciprofloxacin when indicated.
Follow Up Disposition
Admission Criteria
All but minimal superficial injuries should be admitted, especially when refreezing risk exists.
Discharge Criteria
Only very mild superficial frostbite with reliable follow-up.
Issues For Referral
Consult burn, plastic, hand, or general surgery for all but the mildest cases.
Key Practice Insights And Common Pitfalls
Avoid freeze–thaw–refreeze cycles. Maintain correct rewarming temperature. Always address hypothermia and systemic illness. Consider compartment syndrome in pulseless or tense extremities.
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Emergency And Acute Medicine - Gastroenteritis
Basic Overview
Gastroenteritis is an inflammatory condition of the stomach and intestines characterized by diarrhea and vomiting, most commonly caused by infectious agents or exposure to toxins.
Causes And Risk Factors
Infectious causes account for most cases. Viruses are responsible for approximately 50–70% of cases, with norovirus increasingly common among travelers, particularly those returning from Mexico and India. Invasive bacterial causes include Campylobacter, the most common bacterial pathogen, typically acquired from contaminated food, water, or animal exposure and often associated with gross or occult blood in stool. Salmonella is linked to contaminated water, eggs, poultry, or dairy products, with Salmonella typhi causing typhoid fever characterized by persistent fever, abdominal pain, rose spots, splenomegaly, and relative bradycardia. Shigella spreads via the fecal–oral route, while Vibrio parahaemolyticus is associated with raw or undercooked seafood. Yersinia infections arise from contaminated pork, water, or milk and may mimic appendicitis due to mesenteric adenitis. Food-borne toxin-mediated illnesses include Staphylococcus aureus, with symptoms appearing within 1–6 hours, and Bacillus cereus, classically associated with reheated rice, with symptoms developing within 1–36 hours. Cholera causes profuse watery diarrhea described as rice-water stools. Ciguatera poisoning follows fish ingestion and presents with neurologic symptoms such as paresthesias and hypotension. Scombroid poisoning results from spoiled fish and causes flushing, headache, and burning sensations, usually resolving within hours. Protozoal causes include Giardia lamblia, particularly in travelers, campers drinking untreated water, daycare children, and men who have sex with men. Noninfectious causes include heavy metals, organic chemicals, pesticides, radioactive substances, and adverse reactions to food additives. In pediatric patients, most cases are viral and self-limited, with rotavirus being common; Shigella infections may be associated with seizures.
Clinical Features And Presentation
Patients commonly present with nausea, vomiting, diarrhea, abdominal cramps, fever, malaise, myalgias, headache, and anorexia. Bloody or mucous stools suggest invasive disease. Severe cases may involve hypotension, lethargy, and dehydration.
Physical Examination Findings
Findings may include dry mucous membranes, tachycardia, abdominal tenderness, and perianal irritation such as fissures or fistulas, reflecting dehydration or inflammatory diarrhea.
Initial Evaluation And Assessment
Evaluation should include a digital rectal examination to assess for gross or occult blood. Stool leukocyte testing may help differentiate invasive bacterial infections, where leukocytes are present, from viral, protozoal, or toxin-mediated illnesses.
Laboratory And Imaging Evaluation
CBC is indicated in cases of significant blood loss or systemic toxicity. Electrolytes, glucose, BUN, and creatinine should be obtained in patients with lethargy, dehydration, toxicity, altered mental status, or underlying renal or liver disease. Stool cultures are indicated when fecal leukocytes are present, in immunocompromised patients, travelers, food handlers, and healthcare or daycare workers. Blood cultures are reserved for suspected bacteremia, severe systemic illness, or high-risk populations such as the elderly, infants, and immunocompromised patients. Imaging has limited value and is reserved for suspected obstruction or toxic megacolon. In children, laboratory testing is usually unnecessary unless toxicity or immunocompromise is present.
Differential Diagnosis Considerations
Conditions to consider include gastritis, peptic ulcer disease, food allergies, appendicitis, irritable bowel syndrome, inflammatory bowel disease, malrotation with volvulus, Meckel diverticulum, medication-induced diarrhea, and toxin exposures.
Prehospital Management
Establish IV access in patients with severe dehydration and minimize exposure to contaminated body fluids or clothing.
Stabilization And Early Treatment
Management focuses on airway, breathing, and circulation. Severely dehydrated patients require IV fluid resuscitation with 0.9% normal saline.
Emergency Department Care
Oral rehydration with electrolyte solutions is appropriate for mild dehydration. IV fluids are indicated for hypotension, persistent vomiting, altered mental status, metabolic derangements, or severe dehydration, using weight-appropriate boluses followed by maintenance fluids. Bismuth subsalicylate provides symptomatic relief and has antisecretory effects. Antimotility agents may be used cautiously in noninfectious diarrhea but should be avoided or limited in infectious cases due to the risk of prolonged illness or toxic megacolon. Antibiotics are reserved for specific pathogens such as Campylobacter, Salmonella, Shigella, Vibrio, Clostridium difficile, Escherichia coli, and Giardia. Antiemetics such as ondansetron, prochlorperazine, or promethazine may be used for symptom control.
Medication Options
Treatment may include antibiotics tailored to the identified pathogen, antiemetics, and supportive medications for hydration and symptom relief. Drug selection should consider age, pregnancy status, and comorbid conditions.
Disposition And Follow-Up
Admission is required for patients with refractory hypotension, significant bleeding, sepsis, intractable symptoms, severe electrolyte disturbances, metabolic acidosis, altered mental status, or severe dehydration, particularly in children. Patients with mild disease or dehydration responsive to fluids may be discharged.
Follow-Up Guidance
Most cases are self-limited and do not require routine follow-up. Patients with prolonged or recurrent symptoms may benefit from gastroenterology referral.
Key Clinical Insights And Pitfalls
Viruses cause the majority of gastroenteritis cases. Antimotility agents should be avoided in infectious diarrhea. Several commonly used antibiotics are contraindicated in pregnancy. Early recognition of dehydration and judicious use of antibiotics are critical to optimal management.
Basic Overview
Gastroenteritis is an inflammatory condition of the stomach and intestines characterized by diarrhea and vomiting, most commonly caused by infectious agents or exposure to toxins.
Causes And Risk Factors
Infectious causes account for most cases. Viruses are responsible for approximately 50–70% of cases, with norovirus increasingly common among travelers, particularly those returning from Mexico and India. Invasive bacterial causes include Campylobacter, the most common bacterial pathogen, typically acquired from contaminated food, water, or animal exposure and often associated with gross or occult blood in stool. Salmonella is linked to contaminated water, eggs, poultry, or dairy products, with Salmonella typhi causing typhoid fever characterized by persistent fever, abdominal pain, rose spots, splenomegaly, and relative bradycardia. Shigella spreads via the fecal–oral route, while Vibrio parahaemolyticus is associated with raw or undercooked seafood. Yersinia infections arise from contaminated pork, water, or milk and may mimic appendicitis due to mesenteric adenitis. Food-borne toxin-mediated illnesses include Staphylococcus aureus, with symptoms appearing within 1–6 hours, and Bacillus cereus, classically associated with reheated rice, with symptoms developing within 1–36 hours. Cholera causes profuse watery diarrhea described as rice-water stools. Ciguatera poisoning follows fish ingestion and presents with neurologic symptoms such as paresthesias and hypotension. Scombroid poisoning results from spoiled fish and causes flushing, headache, and burning sensations, usually resolving within hours. Protozoal causes include Giardia lamblia, particularly in travelers, campers drinking untreated water, daycare children, and men who have sex with men. Noninfectious causes include heavy metals, organic chemicals, pesticides, radioactive substances, and adverse reactions to food additives. In pediatric patients, most cases are viral and self-limited, with rotavirus being common; Shigella infections may be associated with seizures.
Clinical Features And Presentation
Patients commonly present with nausea, vomiting, diarrhea, abdominal cramps, fever, malaise, myalgias, headache, and anorexia. Bloody or mucous stools suggest invasive disease. Severe cases may involve hypotension, lethargy, and dehydration.
Physical Examination Findings
Findings may include dry mucous membranes, tachycardia, abdominal tenderness, and perianal irritation such as fissures or fistulas, reflecting dehydration or inflammatory diarrhea.
Initial Evaluation And Assessment
Evaluation should include a digital rectal examination to assess for gross or occult blood. Stool leukocyte testing may help differentiate invasive bacterial infections, where leukocytes are present, from viral, protozoal, or toxin-mediated illnesses.
Laboratory And Imaging Evaluation
CBC is indicated in cases of significant blood loss or systemic toxicity. Electrolytes, glucose, BUN, and creatinine should be obtained in patients with lethargy, dehydration, toxicity, altered mental status, or underlying renal or liver disease. Stool cultures are indicated when fecal leukocytes are present, in immunocompromised patients, travelers, food handlers, and healthcare or daycare workers. Blood cultures are reserved for suspected bacteremia, severe systemic illness, or high-risk populations such as the elderly, infants, and immunocompromised patients. Imaging has limited value and is reserved for suspected obstruction or toxic megacolon. In children, laboratory testing is usually unnecessary unless toxicity or immunocompromise is present.
Differential Diagnosis Considerations
Conditions to consider include gastritis, peptic ulcer disease, food allergies, appendicitis, irritable bowel syndrome, inflammatory bowel disease, malrotation with volvulus, Meckel diverticulum, medication-induced diarrhea, and toxin exposures.
Prehospital Management
Establish IV access in patients with severe dehydration and minimize exposure to contaminated body fluids or clothing.
Stabilization And Early Treatment
Management focuses on airway, breathing, and circulation. Severely dehydrated patients require IV fluid resuscitation with 0.9% normal saline.
Emergency Department Care
Oral rehydration with electrolyte solutions is appropriate for mild dehydration. IV fluids are indicated for hypotension, persistent vomiting, altered mental status, metabolic derangements, or severe dehydration, using weight-appropriate boluses followed by maintenance fluids. Bismuth subsalicylate provides symptomatic relief and has antisecretory effects. Antimotility agents may be used cautiously in noninfectious diarrhea but should be avoided or limited in infectious cases due to the risk of prolonged illness or toxic megacolon. Antibiotics are reserved for specific pathogens such as Campylobacter, Salmonella, Shigella, Vibrio, Clostridium difficile, Escherichia coli, and Giardia. Antiemetics such as ondansetron, prochlorperazine, or promethazine may be used for symptom control.
Medication Options
Treatment may include antibiotics tailored to the identified pathogen, antiemetics, and supportive medications for hydration and symptom relief. Drug selection should consider age, pregnancy status, and comorbid conditions.
Disposition And Follow-Up
Admission is required for patients with refractory hypotension, significant bleeding, sepsis, intractable symptoms, severe electrolyte disturbances, metabolic acidosis, altered mental status, or severe dehydration, particularly in children. Patients with mild disease or dehydration responsive to fluids may be discharged.
Follow-Up Guidance
Most cases are self-limited and do not require routine follow-up. Patients with prolonged or recurrent symptoms may benefit from gastroenterology referral.
Key Clinical Insights And Pitfalls
Viruses cause the majority of gastroenteritis cases. Antimotility agents should be avoided in infectious diarrhea. Several commonly used antibiotics are contraindicated in pregnancy. Early recognition of dehydration and judicious use of antibiotics are critical to optimal management.
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Emergency And Acute Medicine - Gallstone Ileus
Fundamental Overview
Clinical Description Mechanical intestinal obstruction caused by impaction of a gallstone within the bowel lumen. Stones are typically larger than 2.5 cm. Gallstone ileus accounts for 1–3% of all intestinal obstructions and occurs most commonly in patients older than 65 years. Females are affected more frequently than males with a ratio of approximately 5:1. Mortality remains high at 15–18%.
Underlying Causes
Chronic inflammation of the gallbladder leads to adhesion formation between the gallbladder and adjacent bowel. Over time, a cholecystoenteric fistula develops, allowing gallstones to migrate into the intestinal tract. The duodenum is the most common site of fistula formation, followed by the colon, while gastric fistulas are rare. Stone impaction most frequently occurs in the terminal ileum (54–65%), the narrowest segment of the small intestine at the ileocecal valve. Other sites include the jejunum (27%) and duodenum (1–3%). Duodenal impaction causing gastric outlet obstruction is referred to as Bouveret syndrome. Large bowel obstruction is uncommon.
Diagnostic Evaluation
Presenting Features And Symptoms Patients often experience “tumbling” abdominal pain characterized by intermittent discomfort as the stone moves through the bowel before becoming lodged. Complete obstruction results in severe and often acute abdominal pain. Common associated symptoms include nausea, bilious or feculent vomiting, obstipation, abdominal distention with tympany, abdominal tenderness with late peritoneal signs, and abnormal bowel sounds. Only 50–60% of patients report a prior history of biliary colic or known gallstone disease. Gallstone ileus is frequently associated with cardiovascular disease, diabetes, and obesity. Physical examination typically reveals abdominal distention and tenderness, and jaundice may be present.
Initial Assessment Requirements Evaluation should focus on confirming the presence of mechanical intestinal obstruction and identifying complications
.
Investigations And Interpretation
Laboratory Studies Electrolytes, blood urea nitrogen, creatinine, and glucose should be assessed due to dehydration and vomiting. Liver function tests and bilirubin may be elevated. Amylase may increase in late obstruction. Complete blood count and hematocrit may demonstrate hemoconcentration from dehydration, with nonspecific leukocytosis.
Imaging Studies
Upright and supine abdominal radiographs may show multiple air–fluid levels and bowel distention. The Rigler triad is diagnostic when two of three findings are present: pneumobilia, partial or complete bowel obstruction, and an ectopic gallstone. Chest radiography is used to assess for pneumoperitoneum. Abdominal CT scanning is the diagnostic modality of choice and allows direct visualization and localization of the obstructing stone. Abdominal ultrasound may identify pneumobilia and gallstones but is less sensitive for detecting the site of obstruction.
Conditions To Consider
Paralytic ileus, adhesive bowel obstruction, volvulus, hernia, intussusception, gastrointestinal malignancy, diverticulitis, bezoar, inflammatory bowel disease, pseudo-obstruction, cholecystitis, ascending cholangitis, and pancreatitis.
Management Approach
Prehospital Considerations Establish intravenous access as early as possible.
Early Stabilization Measures Initiate intravenous fluid resuscitation to correct dehydration and maintain hemodynamic stability.
Emergency Department
Management Insert a nasogastric tube for gastric and intestinal decompression. Maintain nil per os status. Correct electrolyte abnormalities and monitor urine output. Provide adequate analgesia. Begin broad-spectrum antibiotics covering bowel flora, such as piperacillin/tazobactam, ampicillin/sulbactam, or ticarcillin/clavulanate. Acceptable alternatives include carbapenems or a third-generation cephalosporin combined with metronidazole. Prompt surgical consultation is mandatory.
Pharmacologic Therapy
Ampicillin/sulbactam 3 g IV every 6 hours. Piperacillin/tazobactam 3.375 g IV every 6 hours. Ticarcillin/clavulanate 3.1 g IV every 4–6 hours.
Disposition And Follow Up
Indications For Admission All patients with gallstone ileus require hospital admission and urgent surgical evaluation for operative intervention.
Criteria For Discharge None.
Ongoing Care
Recommendations Immediate surgical consultation in the emergency department for definitive operative management.
Clinical Pearls And Common Errors
Gallstone ileus represents a true mechanical intestinal obstruction rather than a functional ileus. Definitive management requires urgent surgical intervention. Mortality is high due to delayed diagnosis and significant comorbidities in affected patients. Maintain a high index of suspicion in elderly patients, particularly women, presenting with bowel obstruction and no prior abdominal surgery. Plain radiographs detect only about 10% of ectopic gallstones, whereas CT imaging is significantly more sensitive. Only half of patients have a known history of biliary colic or gallstone disease.
Fundamental Overview
Clinical Description Mechanical intestinal obstruction caused by impaction of a gallstone within the bowel lumen. Stones are typically larger than 2.5 cm. Gallstone ileus accounts for 1–3% of all intestinal obstructions and occurs most commonly in patients older than 65 years. Females are affected more frequently than males with a ratio of approximately 5:1. Mortality remains high at 15–18%.
Underlying Causes
Chronic inflammation of the gallbladder leads to adhesion formation between the gallbladder and adjacent bowel. Over time, a cholecystoenteric fistula develops, allowing gallstones to migrate into the intestinal tract. The duodenum is the most common site of fistula formation, followed by the colon, while gastric fistulas are rare. Stone impaction most frequently occurs in the terminal ileum (54–65%), the narrowest segment of the small intestine at the ileocecal valve. Other sites include the jejunum (27%) and duodenum (1–3%). Duodenal impaction causing gastric outlet obstruction is referred to as Bouveret syndrome. Large bowel obstruction is uncommon.
Diagnostic Evaluation
Presenting Features And Symptoms Patients often experience “tumbling” abdominal pain characterized by intermittent discomfort as the stone moves through the bowel before becoming lodged. Complete obstruction results in severe and often acute abdominal pain. Common associated symptoms include nausea, bilious or feculent vomiting, obstipation, abdominal distention with tympany, abdominal tenderness with late peritoneal signs, and abnormal bowel sounds. Only 50–60% of patients report a prior history of biliary colic or known gallstone disease. Gallstone ileus is frequently associated with cardiovascular disease, diabetes, and obesity. Physical examination typically reveals abdominal distention and tenderness, and jaundice may be present.
Initial Assessment Requirements Evaluation should focus on confirming the presence of mechanical intestinal obstruction and identifying complications
.
Investigations And Interpretation
Laboratory Studies Electrolytes, blood urea nitrogen, creatinine, and glucose should be assessed due to dehydration and vomiting. Liver function tests and bilirubin may be elevated. Amylase may increase in late obstruction. Complete blood count and hematocrit may demonstrate hemoconcentration from dehydration, with nonspecific leukocytosis.
Imaging Studies
Upright and supine abdominal radiographs may show multiple air–fluid levels and bowel distention. The Rigler triad is diagnostic when two of three findings are present: pneumobilia, partial or complete bowel obstruction, and an ectopic gallstone. Chest radiography is used to assess for pneumoperitoneum. Abdominal CT scanning is the diagnostic modality of choice and allows direct visualization and localization of the obstructing stone. Abdominal ultrasound may identify pneumobilia and gallstones but is less sensitive for detecting the site of obstruction.
Conditions To Consider
Paralytic ileus, adhesive bowel obstruction, volvulus, hernia, intussusception, gastrointestinal malignancy, diverticulitis, bezoar, inflammatory bowel disease, pseudo-obstruction, cholecystitis, ascending cholangitis, and pancreatitis.
Management Approach
Prehospital Considerations Establish intravenous access as early as possible.
Early Stabilization Measures Initiate intravenous fluid resuscitation to correct dehydration and maintain hemodynamic stability.
Emergency Department
Management Insert a nasogastric tube for gastric and intestinal decompression. Maintain nil per os status. Correct electrolyte abnormalities and monitor urine output. Provide adequate analgesia. Begin broad-spectrum antibiotics covering bowel flora, such as piperacillin/tazobactam, ampicillin/sulbactam, or ticarcillin/clavulanate. Acceptable alternatives include carbapenems or a third-generation cephalosporin combined with metronidazole. Prompt surgical consultation is mandatory.
Pharmacologic Therapy
Ampicillin/sulbactam 3 g IV every 6 hours. Piperacillin/tazobactam 3.375 g IV every 6 hours. Ticarcillin/clavulanate 3.1 g IV every 4–6 hours.
Disposition And Follow Up
Indications For Admission All patients with gallstone ileus require hospital admission and urgent surgical evaluation for operative intervention.
Criteria For Discharge None.
Ongoing Care
Recommendations Immediate surgical consultation in the emergency department for definitive operative management.
Clinical Pearls And Common Errors
Gallstone ileus represents a true mechanical intestinal obstruction rather than a functional ileus. Definitive management requires urgent surgical intervention. Mortality is high due to delayed diagnosis and significant comorbidities in affected patients. Maintain a high index of suspicion in elderly patients, particularly women, presenting with bowel obstruction and no prior abdominal surgery. Plain radiographs detect only about 10% of ectopic gallstones, whereas CT imaging is significantly more sensitive. Only half of patients have a known history of biliary colic or gallstone disease.
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Emergency And Acute Medicine - Gastroesophageal Reflux Disease
Basic Overview
Gastroesophageal reflux disease represents a spectrum of conditions in which reflux of gastric contents produces symptoms and mucosal injury of the esophagus. This includes erosive reflux esophagitis and nonerosive reflux disease. Up to 40% of the general population experience reflux symptoms at least monthly.
Pathophysiology And Predisposing Factors
GERD results from failure of the antireflux barrier, allowing increased frequency and duration of gastric acid exposure to the esophagus. The lower esophageal sphincter is the primary barrier, with additional contribution from the crural diaphragm at the gastroesophageal junction. Esophageal acid clearance through peristalsis and intrinsic mucosal resistance further protect against injury. Transient lower esophageal sphincter relaxations occur more frequently in GERD and are a major mechanism of reflux. Repeated acid exposure leads to mucosal acidification, inflammation, necrosis, and complications over time. Reduced LES tone is associated with smoking, alcohol, chocolate, coffee, tea, onions, and medications such as calcium channel blockers, nitrates, opioids, barbiturates, and theophylline. Delayed gastric emptying, obesity, gastric distention, and increased intra-abdominal pressure also contribute. Hiatal hernias may be associated but are not uniformly symptomatic. Associated conditions include pregnancy, diabetes mellitus, hypothyroidism, neurologic disorders, and autoimmune disease.
Clinical Manifestations
Esophageal symptoms include heartburn, regurgitation, and dysphagia. Extraesophageal manifestations include chronic cough, bronchospasm, laryngitis, hoarseness, and recurrent pneumonitis. Patients commonly describe retrosternal burning pain radiating from the epigastrium to the neck, often worse when supine or bending forward and temporarily relieved by antacids. Dysphagia suggests esophageal spasm or stricture, while odynophagia raises concern for ulcerative esophagitis. Atypical presentations include noncardiac chest pain, asthma exacerbations, hiccups, throat clearing, nocturnal choking, and upper gastrointestinal bleeding.
Physical Examination Findings
Physical examination is often nonspecific and may reveal mild epigastric tenderness. Symptoms may worsen when the patient is placed supine or in the Trendelenburg position.
Special Considerations In Children
Physiologic reflux is common in infants and typically resolves with age. Concerning features include persistent vomiting, irritability, feeding refusal, failure to thrive, arching during feeds, and respiratory symptoms.
Initial Assessment Priorities
The primary goal is to exclude emergent conditions such as acute coronary syndrome, esophageal perforation, or aortic pathology. A focused history and complete physical examination, including vital signs and cardiopulmonary evaluation, are essential.
Diagnostic Evaluation
There is no single gold standard diagnostic test. Laboratory studies may show chronic anemia from esophagitis or occult bleeding. Routine imaging is not required, though chest radiography may identify perforation, hiatal hernia, or aortic disease when suspected. A therapeutic trial of acid suppression is often diagnostic, with approximately 90% of patients responding to proton pump inhibitor therapy. Further testing is reserved for refractory or complicated cases and includes barium esophagram for dysphagia, esophageal pH monitoring to correlate symptoms with acid exposure, manometry to assess motility, and upper endoscopy to evaluate for esophagitis, Barrett esophagus, strictures, ulcers, or malignancy.
Differential Diagnosis
Conditions that may mimic GERD include ischemic heart disease, asthma, peptic ulcer disease, gastritis, pancreatitis, hepatitis, esophageal infection or perforation, biliary disease, and mesenteric ischemia.
Prehospital Considerations
Esophageal pain may resemble angina, and airway protection may be required in patients with significant vomiting.
Stabilization And Early Management
Assessment of airway, breathing, and circulation is required. IV fluids are administered for bleeding or shock.
Emergency Department Management
Initial therapy focuses on symptom relief and acid suppression. Antacids, antacids combined with viscous lidocaine, and sublingual nitroglycerin may relieve esophageal spasm. Lifestyle modification is a cornerstone of therapy and includes avoidance of late or heavy meals, remaining upright after eating, head-of-bed elevation, weight reduction, smoking and alcohol cessation, and avoidance of foods and medications that reduce LES tone. Proton pump inhibitors are the most effective agents for healing esophagitis and controlling moderate to severe disease. H2-receptor antagonists are effective for mild to moderate symptoms. Adjunctive agents include alginic acid, sucralfate, and prokinetic agents such as metoclopramide. Endoscopic therapies and antireflux surgery, including fundoplication or incisionless techniques, are reserved for selected patients with refractory disease or complications.
Pregnancy-Specific Considerations
GERD is common during pregnancy due to hormonal changes and increased intra-abdominal pressure. H2 blockers are first-line therapy because of their safety profile, while PPIs are used cautiously. Endoscopy is reserved for severe or complicated cases.
Medication Options
Therapy includes antacids, H2 blockers, proton pump inhibitors, sucralfate, and prokinetic agents. Choice depends on disease severity, comorbidities, and patient-specific factors.
Disposition And Follow-Up
Hospital admission is indicated for significant esophageal bleeding, uncontrolled asthma related to reflux, dehydration, or failure to thrive. Patients with uncomplicated disease may be discharged with outpatient follow-up through primary care or gastroenterology.
Referral And Long-Term Care
Gastroenterology referral is recommended for patients with persistent symptoms requiring long-term therapy, alarm features, or suspected complications such as Barrett esophagus.
Key Clinical Insights And Pitfalls
Effective management of GERD requires both lifestyle modification and pharmacologic therapy. Proton pump inhibitors are preferred for moderate to severe disease or erosive esophagitis. Failure to respond to therapy warrants endoscopic evaluation. Surgical intervention may benefit selected young patients requiring lifelong high-dose acid suppression. Common complications include esophagitis, peptic stricture, Barrett metaplasia, and extraesophageal manifestations such as asthma and chronic cough.
Basic Overview
Gastroesophageal reflux disease represents a spectrum of conditions in which reflux of gastric contents produces symptoms and mucosal injury of the esophagus. This includes erosive reflux esophagitis and nonerosive reflux disease. Up to 40% of the general population experience reflux symptoms at least monthly.
Pathophysiology And Predisposing Factors
GERD results from failure of the antireflux barrier, allowing increased frequency and duration of gastric acid exposure to the esophagus. The lower esophageal sphincter is the primary barrier, with additional contribution from the crural diaphragm at the gastroesophageal junction. Esophageal acid clearance through peristalsis and intrinsic mucosal resistance further protect against injury. Transient lower esophageal sphincter relaxations occur more frequently in GERD and are a major mechanism of reflux. Repeated acid exposure leads to mucosal acidification, inflammation, necrosis, and complications over time. Reduced LES tone is associated with smoking, alcohol, chocolate, coffee, tea, onions, and medications such as calcium channel blockers, nitrates, opioids, barbiturates, and theophylline. Delayed gastric emptying, obesity, gastric distention, and increased intra-abdominal pressure also contribute. Hiatal hernias may be associated but are not uniformly symptomatic. Associated conditions include pregnancy, diabetes mellitus, hypothyroidism, neurologic disorders, and autoimmune disease.
Clinical Manifestations
Esophageal symptoms include heartburn, regurgitation, and dysphagia. Extraesophageal manifestations include chronic cough, bronchospasm, laryngitis, hoarseness, and recurrent pneumonitis. Patients commonly describe retrosternal burning pain radiating from the epigastrium to the neck, often worse when supine or bending forward and temporarily relieved by antacids. Dysphagia suggests esophageal spasm or stricture, while odynophagia raises concern for ulcerative esophagitis. Atypical presentations include noncardiac chest pain, asthma exacerbations, hiccups, throat clearing, nocturnal choking, and upper gastrointestinal bleeding.
Physical Examination Findings
Physical examination is often nonspecific and may reveal mild epigastric tenderness. Symptoms may worsen when the patient is placed supine or in the Trendelenburg position.
Special Considerations In Children
Physiologic reflux is common in infants and typically resolves with age. Concerning features include persistent vomiting, irritability, feeding refusal, failure to thrive, arching during feeds, and respiratory symptoms.
Initial Assessment Priorities
The primary goal is to exclude emergent conditions such as acute coronary syndrome, esophageal perforation, or aortic pathology. A focused history and complete physical examination, including vital signs and cardiopulmonary evaluation, are essential.
Diagnostic Evaluation
There is no single gold standard diagnostic test. Laboratory studies may show chronic anemia from esophagitis or occult bleeding. Routine imaging is not required, though chest radiography may identify perforation, hiatal hernia, or aortic disease when suspected. A therapeutic trial of acid suppression is often diagnostic, with approximately 90% of patients responding to proton pump inhibitor therapy. Further testing is reserved for refractory or complicated cases and includes barium esophagram for dysphagia, esophageal pH monitoring to correlate symptoms with acid exposure, manometry to assess motility, and upper endoscopy to evaluate for esophagitis, Barrett esophagus, strictures, ulcers, or malignancy.
Differential Diagnosis
Conditions that may mimic GERD include ischemic heart disease, asthma, peptic ulcer disease, gastritis, pancreatitis, hepatitis, esophageal infection or perforation, biliary disease, and mesenteric ischemia.
Prehospital Considerations
Esophageal pain may resemble angina, and airway protection may be required in patients with significant vomiting.
Stabilization And Early Management
Assessment of airway, breathing, and circulation is required. IV fluids are administered for bleeding or shock.
Emergency Department Management
Initial therapy focuses on symptom relief and acid suppression. Antacids, antacids combined with viscous lidocaine, and sublingual nitroglycerin may relieve esophageal spasm. Lifestyle modification is a cornerstone of therapy and includes avoidance of late or heavy meals, remaining upright after eating, head-of-bed elevation, weight reduction, smoking and alcohol cessation, and avoidance of foods and medications that reduce LES tone. Proton pump inhibitors are the most effective agents for healing esophagitis and controlling moderate to severe disease. H2-receptor antagonists are effective for mild to moderate symptoms. Adjunctive agents include alginic acid, sucralfate, and prokinetic agents such as metoclopramide. Endoscopic therapies and antireflux surgery, including fundoplication or incisionless techniques, are reserved for selected patients with refractory disease or complications.
Pregnancy-Specific Considerations
GERD is common during pregnancy due to hormonal changes and increased intra-abdominal pressure. H2 blockers are first-line therapy because of their safety profile, while PPIs are used cautiously. Endoscopy is reserved for severe or complicated cases.
Medication Options
Therapy includes antacids, H2 blockers, proton pump inhibitors, sucralfate, and prokinetic agents. Choice depends on disease severity, comorbidities, and patient-specific factors.
Disposition And Follow-Up
Hospital admission is indicated for significant esophageal bleeding, uncontrolled asthma related to reflux, dehydration, or failure to thrive. Patients with uncomplicated disease may be discharged with outpatient follow-up through primary care or gastroenterology.
Referral And Long-Term Care
Gastroenterology referral is recommended for patients with persistent symptoms requiring long-term therapy, alarm features, or suspected complications such as Barrett esophagus.
Key Clinical Insights And Pitfalls
Effective management of GERD requires both lifestyle modification and pharmacologic therapy. Proton pump inhibitors are preferred for moderate to severe disease or erosive esophagitis. Failure to respond to therapy warrants endoscopic evaluation. Surgical intervention may benefit selected young patients requiring lifelong high-dose acid suppression. Common complications include esophagitis, peptic stricture, Barrett metaplasia, and extraesophageal manifestations such as asthma and chronic cough.
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Emergency And Acute Medicine - Gastritis
Basics Description
Inflammatory response of the gastric mucosa to injury, referred to as gastritis. The gastric mucosa is protected by three main defense mechanisms: a mucus layer that forms a protective pH gradient, surface epithelial cells capable of repairing small defects, and a postepithelial barrier that neutralizes acid that penetrates the first two layers. There is no definite correlation between histologic gastritis and dyspeptic symptoms. Epithelial cell damage without associated inflammation is termed gastropathy.
Etiology
Common causes of gastritis include infections, autoimmune disease, drugs such as cocaine, hypersensitivity reactions, and physiologic stress. Common causes of gastropathy include endogenous or exogenous irritants such as bile reflux, alcohol, aspirin and other NSAIDs, ischemia, stress, and chronic congestion. Acute gastritis may occur with severe stress states such as sepsis, burns, or trauma due to reduced splanchnic blood flow leading to decreased mucus production, bicarbonate secretion, and prostaglandin synthesis, resulting in mucosal erosions and hemorrhage. Alcohol induces leukotriene production, causing microvascular stasis and increased permeability with hemorrhage. NSAIDs, including aspirin, interfere with prostaglandin synthesis and cause similar mucosal injury. Steroids may also contribute. Chronic gastritis is most commonly caused by Helicobacter pylori, a gram-negative spiral bacterium found in the gastric mucus layer that produces urease, allowing alkalinization of its microenvironment.
Diagnosis Signs And Symptoms
Common symptoms include dyspepsia, bloating, nausea, vomiting, anorexia, epigastric tenderness, and heartburn. History often reveals episodic or chronic epigastric pain or discomfort, indigestion, eructation, flatulence, nausea or vomiting, and in severe cases hematemesis or melena.
Physical Exam Findings
Examination should include careful assessment of vital signs and orthostatics, stool Hemoccult testing, and evaluation for dehydration and tachycardia in patients with vomiting. Pallor may be present in hemorrhagic gastritis. Abdominal examination is often nonspecific but may reveal epigastric tenderness.
Essential Workup
Initial evaluation focuses on airway, breathing, and circulation, with hematocrit determination and assessment for dehydration or shock.
Diagnostic Tests And Interpretation
Laboratory studies are often normal in uncomplicated gastritis. CBC may reveal anemia in acute hemorrhagic gastritis or leukocytosis with infection. Electrolytes, BUN, creatinine, and glucose assess dehydration and metabolic disturbances. Amylase and lipase help exclude pancreatitis. Urinalysis evaluates dehydration or ketosis. Bilirubin may be elevated in hepatitis. ECG is recommended in elderly patients to evaluate for myocardial ischemia. Endoscopy is usually outpatient unless there is significant hemorrhage and allows visualization of bleeding sites, histologic confirmation, and detection of Helicobacter pylori. Noninvasive H. pylori testing includes urea breath tests, stool antigen testing, and serology. Serum pepsinogen isoenzyme ratios may suggest metaplastic atrophic gastritis.
Differential Diagnosis
Peptic ulcer disease, nonulcer dyspepsia, gastroesophageal reflux disease, biliary colic, cholecystitis, pancreatitis, hepatitis, abdominal aortic aneurysm, aortic dissection, and myocardial infarction should be considered.
Treatment Pre Hospital
Initial management includes airway support and intravenous fluid resuscitation as needed.
Initial Stabilization And Therapy
Patients with acute erosive or hemorrhagic gastritis and hemodynamic instability require aggressive fluid resuscitation with lactated Ringer solution or normal saline via two large-bore IV lines. Nasogastric tube placement is indicated for hematemesis or unstable patients, and Foley catheterization may be used to monitor volume status.
Emergency Department Treatment And Procedures
Symptom control includes antacids, gastrointestinal cocktail therapy, H2 receptor antagonists, proton pump inhibitors, and sucralfate. Narcotics should be avoided as they may mask serious illness. Acute hemorrhagic gastritis requires IV fluids, blood transfusion if indicated, and correction of underlying causes such as alcohol use, sepsis, NSAIDs, or trauma. Stress gastritis prevention in critically ill patients involves antacids or IV H2 blockers or proton pump inhibitors to maintain gastric pH above four. Chronic gastritis due to Helicobacter pylori requires eradication therapy with appropriate antibiotic regimens. Vitamin B12 supplementation is indicated in atrophic gastritis.
Medication
Therapeutic options include antacids, H2 blockers, proton pump inhibitors, sucralfate, bismuth subsalicylate, and misoprostol. First-line Helicobacter pylori treatment consists of triple therapy using a proton pump inhibitor with clarithromycin and amoxicillin or metronidazole. Sequential and bismuth-based quadruple therapies are used in high-resistance or treatment-failure settings.
Follow-Up Disposition
Admission is required for patients with acute hemorrhagic or erosive gastritis presenting with upper gastrointestinal bleeding, tachycardia, hypotension, uncontrolled pain or vomiting, or coagulopathy. Stable patients with normal examinations, laboratory results, and heme-negative stools may be discharged. Patients with heme-positive stools may be discharged only if vital signs and hematocrit are stable and nasogastric aspiration is negative.
Follow-Up Recommendations
Close outpatient follow-up with a gastroenterologist is recommended for endoscopy, biopsy, and Helicobacter pylori testing.
Clinical Pearls And Common Errors
Gastritis and gastropathy are common emergency department presentations characterized by dyspepsia, nausea, and vomiting. Management should include both diagnostic evaluation and targeted therapy. Treatment often involves Helicobacter pylori eradication, though antibiotic resistance is increasing. Early gastroenterology follow-up is essential to detect gastric dysplasia or malignancy.
Basics Description
Inflammatory response of the gastric mucosa to injury, referred to as gastritis. The gastric mucosa is protected by three main defense mechanisms: a mucus layer that forms a protective pH gradient, surface epithelial cells capable of repairing small defects, and a postepithelial barrier that neutralizes acid that penetrates the first two layers. There is no definite correlation between histologic gastritis and dyspeptic symptoms. Epithelial cell damage without associated inflammation is termed gastropathy.
Etiology
Common causes of gastritis include infections, autoimmune disease, drugs such as cocaine, hypersensitivity reactions, and physiologic stress. Common causes of gastropathy include endogenous or exogenous irritants such as bile reflux, alcohol, aspirin and other NSAIDs, ischemia, stress, and chronic congestion. Acute gastritis may occur with severe stress states such as sepsis, burns, or trauma due to reduced splanchnic blood flow leading to decreased mucus production, bicarbonate secretion, and prostaglandin synthesis, resulting in mucosal erosions and hemorrhage. Alcohol induces leukotriene production, causing microvascular stasis and increased permeability with hemorrhage. NSAIDs, including aspirin, interfere with prostaglandin synthesis and cause similar mucosal injury. Steroids may also contribute. Chronic gastritis is most commonly caused by Helicobacter pylori, a gram-negative spiral bacterium found in the gastric mucus layer that produces urease, allowing alkalinization of its microenvironment.
Diagnosis Signs And Symptoms
Common symptoms include dyspepsia, bloating, nausea, vomiting, anorexia, epigastric tenderness, and heartburn. History often reveals episodic or chronic epigastric pain or discomfort, indigestion, eructation, flatulence, nausea or vomiting, and in severe cases hematemesis or melena.
Physical Exam Findings
Examination should include careful assessment of vital signs and orthostatics, stool Hemoccult testing, and evaluation for dehydration and tachycardia in patients with vomiting. Pallor may be present in hemorrhagic gastritis. Abdominal examination is often nonspecific but may reveal epigastric tenderness.
Essential Workup
Initial evaluation focuses on airway, breathing, and circulation, with hematocrit determination and assessment for dehydration or shock.
Diagnostic Tests And Interpretation
Laboratory studies are often normal in uncomplicated gastritis. CBC may reveal anemia in acute hemorrhagic gastritis or leukocytosis with infection. Electrolytes, BUN, creatinine, and glucose assess dehydration and metabolic disturbances. Amylase and lipase help exclude pancreatitis. Urinalysis evaluates dehydration or ketosis. Bilirubin may be elevated in hepatitis. ECG is recommended in elderly patients to evaluate for myocardial ischemia. Endoscopy is usually outpatient unless there is significant hemorrhage and allows visualization of bleeding sites, histologic confirmation, and detection of Helicobacter pylori. Noninvasive H. pylori testing includes urea breath tests, stool antigen testing, and serology. Serum pepsinogen isoenzyme ratios may suggest metaplastic atrophic gastritis.
Differential Diagnosis
Peptic ulcer disease, nonulcer dyspepsia, gastroesophageal reflux disease, biliary colic, cholecystitis, pancreatitis, hepatitis, abdominal aortic aneurysm, aortic dissection, and myocardial infarction should be considered.
Treatment Pre Hospital
Initial management includes airway support and intravenous fluid resuscitation as needed.
Initial Stabilization And Therapy
Patients with acute erosive or hemorrhagic gastritis and hemodynamic instability require aggressive fluid resuscitation with lactated Ringer solution or normal saline via two large-bore IV lines. Nasogastric tube placement is indicated for hematemesis or unstable patients, and Foley catheterization may be used to monitor volume status.
Emergency Department Treatment And Procedures
Symptom control includes antacids, gastrointestinal cocktail therapy, H2 receptor antagonists, proton pump inhibitors, and sucralfate. Narcotics should be avoided as they may mask serious illness. Acute hemorrhagic gastritis requires IV fluids, blood transfusion if indicated, and correction of underlying causes such as alcohol use, sepsis, NSAIDs, or trauma. Stress gastritis prevention in critically ill patients involves antacids or IV H2 blockers or proton pump inhibitors to maintain gastric pH above four. Chronic gastritis due to Helicobacter pylori requires eradication therapy with appropriate antibiotic regimens. Vitamin B12 supplementation is indicated in atrophic gastritis.
Medication
Therapeutic options include antacids, H2 blockers, proton pump inhibitors, sucralfate, bismuth subsalicylate, and misoprostol. First-line Helicobacter pylori treatment consists of triple therapy using a proton pump inhibitor with clarithromycin and amoxicillin or metronidazole. Sequential and bismuth-based quadruple therapies are used in high-resistance or treatment-failure settings.
Follow-Up Disposition
Admission is required for patients with acute hemorrhagic or erosive gastritis presenting with upper gastrointestinal bleeding, tachycardia, hypotension, uncontrolled pain or vomiting, or coagulopathy. Stable patients with normal examinations, laboratory results, and heme-negative stools may be discharged. Patients with heme-positive stools may be discharged only if vital signs and hematocrit are stable and nasogastric aspiration is negative.
Follow-Up Recommendations
Close outpatient follow-up with a gastroenterologist is recommended for endoscopy, biopsy, and Helicobacter pylori testing.
Clinical Pearls And Common Errors
Gastritis and gastropathy are common emergency department presentations characterized by dyspepsia, nausea, and vomiting. Management should include both diagnostic evaluation and targeted therapy. Treatment often involves Helicobacter pylori eradication, though antibiotic resistance is increasing. Early gastroenterology follow-up is essential to detect gastric dysplasia or malignancy.
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Emergency And Acute Medicine - Gangrene
Core Overview
Gas gangrene, also called clostridial myonecrosis, is an acute, rapidly progressive, gas-forming necrotizing infection involving muscle and subcutaneous tissue. It most commonly occurs in post-traumatic or postoperative settings and is characterized by aggressive invasion and destruction of healthy muscle with severe systemic toxicity.
Underlying Causes
The condition is caused by clostridial organisms, which are facultative anaerobic, spore-forming, gram-positive bacilli that produce multiple toxins, the most lethal being alpha-toxin. Clostridium perfringens is responsible for approximately 80–90% of cases. Other causative species include Clostridium novyi, Clostridium septicum, Clostridium histolyticum, Clostridium bifermentans, and Clostridium fallax. Organisms are introduced either through traumatic or postoperative contamination or via nontraumatic mechanisms associated with diabetes mellitus, peripheral vascular disease, alcoholism, intravenous drug use, or malignancy.
Diagnostic Evaluation
Patients typically present with sudden, severe pain in the affected extremity or region. Early findings include low-grade fever and marked tachycardia out of proportion to fever. Skin changes progress from bronze discoloration to purple or red hues. Crepitus, bleb and bullae formation, thin serosanguinous discharge with a sweet odor, rapid tissue spread, altered mental status, and systemic toxicity are common.
Initial Assessment Requirements
Diagnosis is primarily clinical and requires careful history and physical examination, with particular attention to crepitus and rapidly progressive soft-tissue changes. Plain soft-tissue radiographs may demonstrate gas dissecting along fascial planes, although absence of gas does not exclude disease. A stat Gram stain of wound exudate often shows gram-positive bacilli with few leukocytes.
Investigations And Interpretation
Laboratory evaluation includes complete blood count with differential, electrolytes, blood urea nitrogen, creatinine, and coagulation studies. Assessment for hemolysis is essential. Gram stain and anaerobic cultures from wound exudate or tissue biopsy should be obtained. Imaging with plain radiographs may reveal soft-tissue gas, while computed tomography is useful when abdominal or flank involvement is suspected.
Procedural And Surgical Evaluation
All patients with suspected gas gangrene require immediate surgical intervention. Aggressive surgical débridement is mandatory and may include fasciotomy or amputation depending on disease extent.
Conditions To Consider
Differential diagnoses include cellulitis, necrotizing fasciitis, nonclostridial myositis or myonecrosis, and other causes of gas within soft tissues such as dissection from respiratory or gastrointestinal sources.
Management Approach
Early management focuses on rapid resuscitation and definitive therapy. Prehospital care includes establishing intravenous access and initiating isotonic fluid resuscitation.
Early Stabilization Measures
Airway protection and hemodynamic stabilization are priorities. Rapid sequence intubation may be required. Supplemental oxygen, continuous cardiac and pulse oximetry monitoring, aggressive fluid resuscitation, central venous access, and sepsis protocol initiation are recommended, especially in patients with septic shock.
Emergency Department Management
Immediate broad-spectrum intravenous antibiotics should be administered, targeting Clostridium species, group A Streptococcus, and mixed aerobic and anaerobic organisms. Definitive antimicrobial therapy consists of penicillin G combined with clindamycin. Alternatives include ceftriaxone or erythromycin. For polymicrobial infections, combination therapy with penicillin, clindamycin, metronidazole or vancomycin, and gram-negative coverage such as gentamicin is indicated. Emergent surgical consultation is essential. Hyperbaric oxygen therapy may be used as an adjunct in stable patients. Tetanus prophylaxis should be provided. Patients must be closely monitored for complications such as acute respiratory distress syndrome, renal failure, myocardial instability, and disseminated intravascular coagulation.
Pharmacologic Therapy
Recommended medications include penicillin G 24 million units per day IV divided every 4–6 hours, clindamycin 900 mg IV every 8 hours, ceftriaxone 2 g IV every 12 hours, erythromycin 1 g IV every 6 hours, gentamicin 2 mg/kg IV every 8 hours, metronidazole 500 mg IV every 8 hours, tetanus immune globulin 500 IU IM, and tetanus toxoid 0.5 mg IM.
Disposition And Follow-Up
All patients with gas gangrene and evidence of myonecrosis require admission for urgent surgical débridement and intravenous antibiotics. No patient with acute gangrene should be discharged. Referral for hyperbaric oxygen therapy may be considered after stabilization.
Clinical Insights And Common Pitfalls
Bacteremia occurs in approximately 15% of cases and can rapidly progress to intravascular hemolysis. Early recognition, prompt surgical intervention, and immediate antibiotic therapy are critical. Hyperbaric oxygen therapy should only be used as an adjunct and never as a substitute for surgery.
Core Overview
Gas gangrene, also called clostridial myonecrosis, is an acute, rapidly progressive, gas-forming necrotizing infection involving muscle and subcutaneous tissue. It most commonly occurs in post-traumatic or postoperative settings and is characterized by aggressive invasion and destruction of healthy muscle with severe systemic toxicity.
Underlying Causes
The condition is caused by clostridial organisms, which are facultative anaerobic, spore-forming, gram-positive bacilli that produce multiple toxins, the most lethal being alpha-toxin. Clostridium perfringens is responsible for approximately 80–90% of cases. Other causative species include Clostridium novyi, Clostridium septicum, Clostridium histolyticum, Clostridium bifermentans, and Clostridium fallax. Organisms are introduced either through traumatic or postoperative contamination or via nontraumatic mechanisms associated with diabetes mellitus, peripheral vascular disease, alcoholism, intravenous drug use, or malignancy.
Diagnostic Evaluation
Patients typically present with sudden, severe pain in the affected extremity or region. Early findings include low-grade fever and marked tachycardia out of proportion to fever. Skin changes progress from bronze discoloration to purple or red hues. Crepitus, bleb and bullae formation, thin serosanguinous discharge with a sweet odor, rapid tissue spread, altered mental status, and systemic toxicity are common.
Initial Assessment Requirements
Diagnosis is primarily clinical and requires careful history and physical examination, with particular attention to crepitus and rapidly progressive soft-tissue changes. Plain soft-tissue radiographs may demonstrate gas dissecting along fascial planes, although absence of gas does not exclude disease. A stat Gram stain of wound exudate often shows gram-positive bacilli with few leukocytes.
Investigations And Interpretation
Laboratory evaluation includes complete blood count with differential, electrolytes, blood urea nitrogen, creatinine, and coagulation studies. Assessment for hemolysis is essential. Gram stain and anaerobic cultures from wound exudate or tissue biopsy should be obtained. Imaging with plain radiographs may reveal soft-tissue gas, while computed tomography is useful when abdominal or flank involvement is suspected.
Procedural And Surgical Evaluation
All patients with suspected gas gangrene require immediate surgical intervention. Aggressive surgical débridement is mandatory and may include fasciotomy or amputation depending on disease extent.
Conditions To Consider
Differential diagnoses include cellulitis, necrotizing fasciitis, nonclostridial myositis or myonecrosis, and other causes of gas within soft tissues such as dissection from respiratory or gastrointestinal sources.
Management Approach
Early management focuses on rapid resuscitation and definitive therapy. Prehospital care includes establishing intravenous access and initiating isotonic fluid resuscitation.
Early Stabilization Measures
Airway protection and hemodynamic stabilization are priorities. Rapid sequence intubation may be required. Supplemental oxygen, continuous cardiac and pulse oximetry monitoring, aggressive fluid resuscitation, central venous access, and sepsis protocol initiation are recommended, especially in patients with septic shock.
Emergency Department Management
Immediate broad-spectrum intravenous antibiotics should be administered, targeting Clostridium species, group A Streptococcus, and mixed aerobic and anaerobic organisms. Definitive antimicrobial therapy consists of penicillin G combined with clindamycin. Alternatives include ceftriaxone or erythromycin. For polymicrobial infections, combination therapy with penicillin, clindamycin, metronidazole or vancomycin, and gram-negative coverage such as gentamicin is indicated. Emergent surgical consultation is essential. Hyperbaric oxygen therapy may be used as an adjunct in stable patients. Tetanus prophylaxis should be provided. Patients must be closely monitored for complications such as acute respiratory distress syndrome, renal failure, myocardial instability, and disseminated intravascular coagulation.
Pharmacologic Therapy
Recommended medications include penicillin G 24 million units per day IV divided every 4–6 hours, clindamycin 900 mg IV every 8 hours, ceftriaxone 2 g IV every 12 hours, erythromycin 1 g IV every 6 hours, gentamicin 2 mg/kg IV every 8 hours, metronidazole 500 mg IV every 8 hours, tetanus immune globulin 500 IU IM, and tetanus toxoid 0.5 mg IM.
Disposition And Follow-Up
All patients with gas gangrene and evidence of myonecrosis require admission for urgent surgical débridement and intravenous antibiotics. No patient with acute gangrene should be discharged. Referral for hyperbaric oxygen therapy may be considered after stabilization.
Clinical Insights And Common Pitfalls
Bacteremia occurs in approximately 15% of cases and can rapidly progress to intravascular hemolysis. Early recognition, prompt surgical intervention, and immediate antibiotic therapy are critical. Hyperbaric oxygen therapy should only be used as an adjunct and never as a substitute for surgery.
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Emergency And Acute Medicine - Gastric Outlet Obstruction
Core Overview
Gastric outlet obstruction refers to any condition that impedes the passage of gastric contents into the duodenum. The underlying cause may originate from the stomach, duodenum, or extraluminal structures. Both benign and malignant etiologies are implicated, with malignancy being the most common cause in adults. Neoplasms may be intrinsic or extrinsic, including pancreatic tumors, gastric lymphoma, duodenal tumors, and gallbladder cancer, which can compress the pylorus or proximal duodenum. Peptic ulcer disease is no longer the leading adult cause due to effective Helicobacter pylori treatment and acid suppression therapy. In children, hypertrophic pyloric stenosis is the most common cause. Additional mechanisms include postoperative complications, gastric volvulus, polyps, bezoars, duplication cysts, and pyloric or duodenal edema, scarring, strictures, webs, or hyperplasia related to caustic injury or chronic pancreatitis.
Pathophysiologic Basis
Regardless of etiology, gastric outlet obstruction leads to impaired gastric emptying, resulting in nausea and predominantly nonbilious vomiting. Persistent emesis causes dehydration and electrolyte abnormalities, particularly hypokalemic, hypochloremic metabolic alkalosis. Chronic obstruction may result in weight loss, malnutrition, and failure to thrive.
Clinical Presentation
Patients often report intermittent symptoms that worsen as obstruction progresses. Common complaints include nausea, nonbilious vomiting, vague or epigastric abdominal pain, early satiety, epigastric fullness, and relief of discomfort after emesis. Chronic cases are associated with weight loss and nutritional decline.
Physical Examination Findings
Vital signs may initially be normal but can reveal tachycardia or hypotension in significant volume depletion. Abdominal examination may show epigastric or generalized distention with tympany. A succussion splash more than four hours after eating is suggestive. Digital rectal examination should assess for occult blood. Signs of dehydration include dry mucous membranes and decreased skin turgor, while chronic cases may show evidence of malnutrition.
Special Population Considerations
In elderly patients, symptoms such as abdominal pain and vomiting may be subtle or atypical, and alternative diagnoses including cardiac or neurologic causes should be considered. In pediatrics, idiopathic hypertrophic pyloric stenosis is the classic presentation, typically affecting male infants between two and eight weeks of age. Vomiting progresses from intermittent and nonprojectile to forceful projectile emesis. A visible midepigastric peristaltic wave may precede vomiting, and an epigastric “olive” mass is palpable in most cases.
Initial Diagnostic Approach
Evaluation begins with a thorough history and physical examination to assess symptom progression, hydration status, and risk factors for malignancy or peptic ulcer disease.
Laboratory And Imaging Assessment
Laboratory studies may show anemia from malignancy or gastrointestinal bleeding, hemoconcentration from dehydration, hypokalemia, hypochloremic metabolic alkalosis, hypoglycemia, and prerenal azotemia. Additional tests include urinalysis, amylase, lipase, liver function studies, and Helicobacter pylori testing when indicated. Plain abdominal radiographs are often nondiagnostic but may reveal gastric dilation or absence of distal bowel gas. In pediatric patients, abdominal ultrasound is preferred and may demonstrate an elongated hypertrophic pyloric sphincter. In adults, abdominal CT is highly useful for identifying intraluminal, extraluminal, and neoplastic causes. Upper gastrointestinal contrast studies may show characteristic signs of pyloric stenosis, and upper endoscopy allows direct visualization of the gastric outlet and proximal duodenum.
Alternative Diagnoses To Consider
Differential diagnoses include proximal bowel obstruction, peptic ulcer disease exacerbation, gastroenteritis, cholelithiasis, cholecystitis, acute pancreatitis, diabetic gastroparesis, and psychogenic vomiting.
Early Management Principles
Prehospital care focuses on airway assessment, oxygen administration, intravenous access, and fluid resuscitation in patients with dehydration or active vomiting.
Resuscitation And Stabilization
Initial therapy includes isotonic fluid resuscitation with 0.9% normal saline. Adults typically receive one-liter boluses, while children receive 20 mL/kg. Electrolyte abnormalities, especially hypokalemia, must be corrected promptly.
Emergency Department Interventions
Placement of a nasogastric tube for decompression is recommended. A Foley catheter may be used to monitor urine output. Definitive management often requires surgical or gastroenterologic intervention, including endoscopic balloon dilation for benign strictures, enteral stent placement or gastrojejunostomy for malignant causes, and surgical procedures such as pyloroplasty, antrectomy, vagotomy, or gastrojejunostomy for benign disease.
Pharmacologic Therapy
Acid suppression may be initiated with intravenous H2 blockers such as famotidine or ranitidine, or proton pump inhibitors such as pantoprazole. Helicobacter pylori eradication therapy should be considered when appropriate.
Disposition And Follow-Up
Most patients with gastric outlet obstruction require hospital admission for fluid resuscitation, electrolyte correction, and specialist evaluation. Discharge is uncommon and should only be considered if symptoms have resolved, volume status and laboratory values are normal, and the patient has been evaluated and cleared by surgery or gastroenterology.
Key Clinical Insights And Pitfalls
Common errors include misdiagnosing gastric outlet obstruction as gastroenteritis, overreliance on plain radiographs, failure to consider malignancy in patients with epigastric pain and vomiting, and inadequate fluid resuscitation, particularly in elderly and pediatric populations.
Core Overview
Gastric outlet obstruction refers to any condition that impedes the passage of gastric contents into the duodenum. The underlying cause may originate from the stomach, duodenum, or extraluminal structures. Both benign and malignant etiologies are implicated, with malignancy being the most common cause in adults. Neoplasms may be intrinsic or extrinsic, including pancreatic tumors, gastric lymphoma, duodenal tumors, and gallbladder cancer, which can compress the pylorus or proximal duodenum. Peptic ulcer disease is no longer the leading adult cause due to effective Helicobacter pylori treatment and acid suppression therapy. In children, hypertrophic pyloric stenosis is the most common cause. Additional mechanisms include postoperative complications, gastric volvulus, polyps, bezoars, duplication cysts, and pyloric or duodenal edema, scarring, strictures, webs, or hyperplasia related to caustic injury or chronic pancreatitis.
Pathophysiologic Basis
Regardless of etiology, gastric outlet obstruction leads to impaired gastric emptying, resulting in nausea and predominantly nonbilious vomiting. Persistent emesis causes dehydration and electrolyte abnormalities, particularly hypokalemic, hypochloremic metabolic alkalosis. Chronic obstruction may result in weight loss, malnutrition, and failure to thrive.
Clinical Presentation
Patients often report intermittent symptoms that worsen as obstruction progresses. Common complaints include nausea, nonbilious vomiting, vague or epigastric abdominal pain, early satiety, epigastric fullness, and relief of discomfort after emesis. Chronic cases are associated with weight loss and nutritional decline.
Physical Examination Findings
Vital signs may initially be normal but can reveal tachycardia or hypotension in significant volume depletion. Abdominal examination may show epigastric or generalized distention with tympany. A succussion splash more than four hours after eating is suggestive. Digital rectal examination should assess for occult blood. Signs of dehydration include dry mucous membranes and decreased skin turgor, while chronic cases may show evidence of malnutrition.
Special Population Considerations
In elderly patients, symptoms such as abdominal pain and vomiting may be subtle or atypical, and alternative diagnoses including cardiac or neurologic causes should be considered. In pediatrics, idiopathic hypertrophic pyloric stenosis is the classic presentation, typically affecting male infants between two and eight weeks of age. Vomiting progresses from intermittent and nonprojectile to forceful projectile emesis. A visible midepigastric peristaltic wave may precede vomiting, and an epigastric “olive” mass is palpable in most cases.
Initial Diagnostic Approach
Evaluation begins with a thorough history and physical examination to assess symptom progression, hydration status, and risk factors for malignancy or peptic ulcer disease.
Laboratory And Imaging Assessment
Laboratory studies may show anemia from malignancy or gastrointestinal bleeding, hemoconcentration from dehydration, hypokalemia, hypochloremic metabolic alkalosis, hypoglycemia, and prerenal azotemia. Additional tests include urinalysis, amylase, lipase, liver function studies, and Helicobacter pylori testing when indicated. Plain abdominal radiographs are often nondiagnostic but may reveal gastric dilation or absence of distal bowel gas. In pediatric patients, abdominal ultrasound is preferred and may demonstrate an elongated hypertrophic pyloric sphincter. In adults, abdominal CT is highly useful for identifying intraluminal, extraluminal, and neoplastic causes. Upper gastrointestinal contrast studies may show characteristic signs of pyloric stenosis, and upper endoscopy allows direct visualization of the gastric outlet and proximal duodenum.
Alternative Diagnoses To Consider
Differential diagnoses include proximal bowel obstruction, peptic ulcer disease exacerbation, gastroenteritis, cholelithiasis, cholecystitis, acute pancreatitis, diabetic gastroparesis, and psychogenic vomiting.
Early Management Principles
Prehospital care focuses on airway assessment, oxygen administration, intravenous access, and fluid resuscitation in patients with dehydration or active vomiting.
Resuscitation And Stabilization
Initial therapy includes isotonic fluid resuscitation with 0.9% normal saline. Adults typically receive one-liter boluses, while children receive 20 mL/kg. Electrolyte abnormalities, especially hypokalemia, must be corrected promptly.
Emergency Department Interventions
Placement of a nasogastric tube for decompression is recommended. A Foley catheter may be used to monitor urine output. Definitive management often requires surgical or gastroenterologic intervention, including endoscopic balloon dilation for benign strictures, enteral stent placement or gastrojejunostomy for malignant causes, and surgical procedures such as pyloroplasty, antrectomy, vagotomy, or gastrojejunostomy for benign disease.
Pharmacologic Therapy
Acid suppression may be initiated with intravenous H2 blockers such as famotidine or ranitidine, or proton pump inhibitors such as pantoprazole. Helicobacter pylori eradication therapy should be considered when appropriate.
Disposition And Follow-Up
Most patients with gastric outlet obstruction require hospital admission for fluid resuscitation, electrolyte correction, and specialist evaluation. Discharge is uncommon and should only be considered if symptoms have resolved, volume status and laboratory values are normal, and the patient has been evaluated and cleared by surgery or gastroenterology.
Key Clinical Insights And Pitfalls
Common errors include misdiagnosing gastric outlet obstruction as gastroenteritis, overreliance on plain radiographs, failure to consider malignancy in patients with epigastric pain and vomiting, and inadequate fluid resuscitation, particularly in elderly and pediatric populations.
- Published on
Emergency And Acute Medicine - Epistaxis
Basic description
Epistaxis is a frequent emergency presentation that is typically mild and self-limited but can occasionally be life threatening. The lifetime incidence is approximately 60%, with most cases occurring in children younger than 10 years. Males are affected more often than females. Severe hemorrhage requiring surgical intervention is more common in patients older than 50 years.
Epistaxis occurs more frequently in low-humidity environments, during winter months, in northern climates, and at high altitude.
The nasal cavity receives blood supply from both the internal and external carotid arteries. Management depends on the location of bleeding.
Anterior epistaxis accounts for about 90% of cases and is usually visualized directly in the anterior nasal cavity. The most common source is Kiesselbach plexus on the anteroinferior nasal septum. Less commonly, bleeding originates from the posterior nasal floor or septum.
Posterior epistaxis represents about 10% of cases and arises from vessels not directly visualized, most often branches of the sphenopalatine artery.
Etiology
Idiopathic causes include dry nasal mucosa related to low humidity.
Foreign bodies are common in children and in patients with psychiatric illness or developmental delay.
Infectious causes include rhinitis, sinusitis, nasal diphtheria, and nasal mucormycosis.
Allergic rhinitis is a frequent contributor.
Trauma includes nose picking, postoperative injury, facial trauma, and barotrauma.
Environmental irritants include ammonia, gasoline, sulfuric acid, and glutaraldehyde.
Intranasal neoplasms include papilloma and other tumors.
Coagulopathies include hemophilia A or B, von Willebrand disease, thrombocytopenia from liver disease, leukemia, chemotherapy, viral illness, or autoimmune disease.
Platelet dysfunction may occur with renal disease or chronic alcohol use.
Medication-related causes include salicylates, NSAIDs, heparin, and warfarin.
Other causes include hereditary hemorrhagic telangiectasia, atherosclerosis of nasal vessels, and endometriosis.
Diagnosis – signs and symptoms
History
Determine laterality, severity, and duration of bleeding.
Assess recurrence and prior episodes.
Ask about nasal obstruction, vomiting or coughing blood, known tumors, or bleeding disorders.
Easy bruising or unusual bleeding suggests an underlying coagulopathy.
Identify comorbid conditions that may be worsened by blood loss, such as coronary artery disease or chronic lung disease.
Physical examination
Assess vital signs for evidence of hemorrhagic shock.
Look for signs of coagulopathy including bruising, petechiae, or purpura.
Inspect the nasal cavity after topical anesthesia and vasoconstriction using a nasal speculum.
Evaluate for blood in the mouth or oropharynx.
Essential workup
Assess airway and hemodynamic stability.
Determine whether bleeding is anterior or posterior.
Evaluate for underlying bleeding disorders when indicated.
Diagnosis tests and interpretation
Laboratory studies
For severe bleeding or suspected coagulopathy consider CBC, type and cross-match, PT/INR, PTT, and BUN.
Diagnostic procedures
Direct visualization with nasal speculum after topical anesthetic and vasoconstrictor. Adequate lighting and suction are essential.
Differential diagnosis
Hematemesis
Hemoptysis
Pediatric considerations
Posterior epistaxis is uncommon in children and should prompt evaluation for bleeding disorders.
Consider foreign bodies or neoplasms such as juvenile angiofibroma.
Use of topical antiseptic ointment for four weeks reduces recurrent epistaxis.
Treatment – prehospital
Stable patients should lean forward, pinch the soft part of the nose, and spit out blood rather than swallow it.
Unstable patients require airway management, IV access, and crystalloid resuscitation.
Initial stabilization and therapy
Secure the airway in patients with altered mental status, facial trauma, or aspiration risk.
Treat hypotension with fluids and blood products as indicated.
Emergency department treatment and procedures
Use universal precautions.
For anterior bleeding, apply direct pressure for 15 minutes.
If bleeding persists, insert cotton pledgets soaked in anesthetic and vasoconstrictor.
Clear clots by gentle blowing, irrigation, or suction.
Cauterize the identified bleeding site with silver nitrate and consider absorbable hemostatic agents.
If cautery fails, anterior nasal packing or balloon devices may be used, ensuring adequate anesthesia and careful placement.
Petroleum-impregnated gauze packing is an alternative when commercial devices are unavailable.
Persistent bleeding after anterior packing suggests inadequate packing or a posterior source.
Posterior epistaxis may require posterior packing with commercial devices or a Foley catheter technique and mandates hospital admission with monitoring.
Posterior packs should not remain in place longer than three days due to infection risk.
Medication
Topical vasoactive agents include cocaine 4%, oxymetazoline with lidocaine, phenylephrine, or anesthetic–epinephrine mixtures.
Antibiotics are required while nasal packing is in place, including amoxicillin–clavulanate, cephalexin, clindamycin, or trimethoprim–sulfamethoxazole.
Follow-up and disposition
Admission criteria
Severe hemorrhage requiring transfusion.
Significant coagulopathy.
Posterior nasal packing, which requires admission, telemetry, oxygen, and specialist consultation.
Anterior packing without reliable follow-up.
Discharge criteria
Hemodynamically stable patients with controlled bleeding.
Use topical oxymetazoline for up to two days, humidification, nasal lubrication, and avoidance of nasal trauma.
All patients discharged with packing must receive antistaphylococcal antibiotics.
Issues for referral
All patients with nasal packing should see an otolaryngologist within 48 hours.
Recurrent unilateral bleeding, nasal obstruction, or suspicious lesions require specialist evaluation.
Follow-up recommendations
Return for uncontrolled bleeding, fever, breathing difficulty, or vomiting.
Avoid nose blowing for 12 hours after bleeding stops.
If bleeding recurs, lean forward and pinch the nose firmly for 10 minutes without interruption.
Use nasal ointment and home humidification as instructed.
Clinical pearls and common missteps
Suspect nasal foreign bodies in unilateral bleeding in children and cognitively impaired patients.
Avoid petroleum-based ointments on anterior nasal balloons due to risk of delayed rupture.
Do not overinflate balloons or pack too tightly, as this may cause tissue necrosis.
Patients with nasal packing should always receive prophylactic antibiotics.
Basic description
Epistaxis is a frequent emergency presentation that is typically mild and self-limited but can occasionally be life threatening. The lifetime incidence is approximately 60%, with most cases occurring in children younger than 10 years. Males are affected more often than females. Severe hemorrhage requiring surgical intervention is more common in patients older than 50 years.
Epistaxis occurs more frequently in low-humidity environments, during winter months, in northern climates, and at high altitude.
The nasal cavity receives blood supply from both the internal and external carotid arteries. Management depends on the location of bleeding.
Anterior epistaxis accounts for about 90% of cases and is usually visualized directly in the anterior nasal cavity. The most common source is Kiesselbach plexus on the anteroinferior nasal septum. Less commonly, bleeding originates from the posterior nasal floor or septum.
Posterior epistaxis represents about 10% of cases and arises from vessels not directly visualized, most often branches of the sphenopalatine artery.
Etiology
Idiopathic causes include dry nasal mucosa related to low humidity.
Foreign bodies are common in children and in patients with psychiatric illness or developmental delay.
Infectious causes include rhinitis, sinusitis, nasal diphtheria, and nasal mucormycosis.
Allergic rhinitis is a frequent contributor.
Trauma includes nose picking, postoperative injury, facial trauma, and barotrauma.
Environmental irritants include ammonia, gasoline, sulfuric acid, and glutaraldehyde.
Intranasal neoplasms include papilloma and other tumors.
Coagulopathies include hemophilia A or B, von Willebrand disease, thrombocytopenia from liver disease, leukemia, chemotherapy, viral illness, or autoimmune disease.
Platelet dysfunction may occur with renal disease or chronic alcohol use.
Medication-related causes include salicylates, NSAIDs, heparin, and warfarin.
Other causes include hereditary hemorrhagic telangiectasia, atherosclerosis of nasal vessels, and endometriosis.
Diagnosis – signs and symptoms
History
Determine laterality, severity, and duration of bleeding.
Assess recurrence and prior episodes.
Ask about nasal obstruction, vomiting or coughing blood, known tumors, or bleeding disorders.
Easy bruising or unusual bleeding suggests an underlying coagulopathy.
Identify comorbid conditions that may be worsened by blood loss, such as coronary artery disease or chronic lung disease.
Physical examination
Assess vital signs for evidence of hemorrhagic shock.
Look for signs of coagulopathy including bruising, petechiae, or purpura.
Inspect the nasal cavity after topical anesthesia and vasoconstriction using a nasal speculum.
Evaluate for blood in the mouth or oropharynx.
Essential workup
Assess airway and hemodynamic stability.
Determine whether bleeding is anterior or posterior.
Evaluate for underlying bleeding disorders when indicated.
Diagnosis tests and interpretation
Laboratory studies
For severe bleeding or suspected coagulopathy consider CBC, type and cross-match, PT/INR, PTT, and BUN.
Diagnostic procedures
Direct visualization with nasal speculum after topical anesthetic and vasoconstrictor. Adequate lighting and suction are essential.
Differential diagnosis
Hematemesis
Hemoptysis
Pediatric considerations
Posterior epistaxis is uncommon in children and should prompt evaluation for bleeding disorders.
Consider foreign bodies or neoplasms such as juvenile angiofibroma.
Use of topical antiseptic ointment for four weeks reduces recurrent epistaxis.
Treatment – prehospital
Stable patients should lean forward, pinch the soft part of the nose, and spit out blood rather than swallow it.
Unstable patients require airway management, IV access, and crystalloid resuscitation.
Initial stabilization and therapy
Secure the airway in patients with altered mental status, facial trauma, or aspiration risk.
Treat hypotension with fluids and blood products as indicated.
Emergency department treatment and procedures
Use universal precautions.
For anterior bleeding, apply direct pressure for 15 minutes.
If bleeding persists, insert cotton pledgets soaked in anesthetic and vasoconstrictor.
Clear clots by gentle blowing, irrigation, or suction.
Cauterize the identified bleeding site with silver nitrate and consider absorbable hemostatic agents.
If cautery fails, anterior nasal packing or balloon devices may be used, ensuring adequate anesthesia and careful placement.
Petroleum-impregnated gauze packing is an alternative when commercial devices are unavailable.
Persistent bleeding after anterior packing suggests inadequate packing or a posterior source.
Posterior epistaxis may require posterior packing with commercial devices or a Foley catheter technique and mandates hospital admission with monitoring.
Posterior packs should not remain in place longer than three days due to infection risk.
Medication
Topical vasoactive agents include cocaine 4%, oxymetazoline with lidocaine, phenylephrine, or anesthetic–epinephrine mixtures.
Antibiotics are required while nasal packing is in place, including amoxicillin–clavulanate, cephalexin, clindamycin, or trimethoprim–sulfamethoxazole.
Follow-up and disposition
Admission criteria
Severe hemorrhage requiring transfusion.
Significant coagulopathy.
Posterior nasal packing, which requires admission, telemetry, oxygen, and specialist consultation.
Anterior packing without reliable follow-up.
Discharge criteria
Hemodynamically stable patients with controlled bleeding.
Use topical oxymetazoline for up to two days, humidification, nasal lubrication, and avoidance of nasal trauma.
All patients discharged with packing must receive antistaphylococcal antibiotics.
Issues for referral
All patients with nasal packing should see an otolaryngologist within 48 hours.
Recurrent unilateral bleeding, nasal obstruction, or suspicious lesions require specialist evaluation.
Follow-up recommendations
Return for uncontrolled bleeding, fever, breathing difficulty, or vomiting.
Avoid nose blowing for 12 hours after bleeding stops.
If bleeding recurs, lean forward and pinch the nose firmly for 10 minutes without interruption.
Use nasal ointment and home humidification as instructed.
Clinical pearls and common missteps
Suspect nasal foreign bodies in unilateral bleeding in children and cognitively impaired patients.
Avoid petroleum-based ointments on anterior nasal balloons due to risk of delayed rupture.
Do not overinflate balloons or pack too tightly, as this may cause tissue necrosis.
Patients with nasal packing should always receive prophylactic antibiotics.
- Published on
Emergency And Acute Medicine - Erythema Infectiosum
Basic description
Erythema infectiosum is a characteristic viral exanthem, also known as fifth disease, historically the fifth most commonly described childhood rash. It typically presents with a mild viral prodrome followed by a “slapped-cheek” facial rash and a subsequent diffuse, lacy, reticular eruption, with or without arthropathy. It most commonly affects school-aged children younger than 14 years and is usually self-limited with lifelong immunity. Chronic or severe disease is rare but may occur in patients with congenital anemias or immunosuppression. Infection during pregnancy carries a risk of serious fetal complications.
Etiology
The condition is caused by human parvovirus B19, a small single-stranded DNA virus that infects human erythroid progenitor cells and transiently suppresses erythropoiesis. Transmission occurs via respiratory droplets, blood products, and vertical maternal–fetal spread. It is most common in late winter and spring. The incubation period ranges from 4 to 21 days, and patients are most contagious during the week before rash onset. Most adults have serologic evidence of prior infection.
Diagnosis – signs and symptoms
Young children typically develop a bright erythematous “slapped-cheek” rash accompanied by low-grade fever and malaise. Four to fourteen days later, a diffuse, pruritic, lacy rash may appear, most prominent on the extremities and usually sparing the palms and soles. Adolescents and adults may develop symmetric polyarthropathy, particularly involving small joints, while children more commonly experience knee involvement. Many patients remain asymptomatic or experience only mild viral symptoms.
History
Symptoms often begin with mild constitutional complaints such as fever, headache, nasal congestion, nausea, or sore throat. Patients are contagious only before the facial rash appears.
Physical examination
Stage one consists of coalescent, warm, erythematous, edematous facial papules with circumoral pallor. Stage two features a diffuse, maculopapular, reticular rash that may persist for weeks. Stage three is marked by fading of the rash with recurrence triggered by heat, sunlight, stress, or exercise, eventually resolving without scarring.
Essential workup
Diagnosis is clinical and based on classic presentation.
Diagnosis tests and interpretation
Laboratory testing is usually unnecessary. A CBC and reticulocyte count are indicated if aplastic crisis is suspected. In immunocompromised or pregnant patients, confirmation may be obtained with parvovirus B19 PCR or serology. IgM antibodies indicate acute infection, while IgG antibodies confirm immunity. Pregnant patients may require ultrasound monitoring for hydrops fetalis.
Differential diagnosis
Allergic reaction, drug eruption, nonspecific viral exanthem, measles, rubella, roseola, scarlet fever, erysipelas, infectious mononucleosis, collagen vascular disease, rheumatoid arthritis, sunburn, and enteroviral infections.
Treatment
The disease is typically self-limited and requires no specific therapy.
Prehospital care
Supportive care and standard ABCs for severe presentations.
Initial stabilization and therapy
Airway, breathing, and circulation management as needed. Supplemental oxygen and intravenous fluids may be required for severe dehydration. Severe anemia should be treated with packed red blood cell transfusion. Analgesia may be provided for arthropathy.
Emergency department treatment and procedures
No antiviral therapy or vaccine is available. Management is supportive, including antipyretics for fever, NSAIDs for joint pain if renal function permits, antihistamines for pruritus, and IV fluids when indicated. Immunocompromised patients with chronic infection or red cell aplasia may benefit from IVIG in consultation with infectious disease specialists. Hospitalization is indicated for aplastic crisis or severe complications.
Medication
Acetaminophen or ibuprofen for fever and pain. Diphenhydramine may be used for pruritus with caution regarding sedation. IVIG is reserved for select cases under specialist guidance.
Follow-up and disposition
Admission criteria
Aplastic crisis, severe anemia, hydrops fetalis, severe immunosuppression, toxic appearance, or debilitating arthritis.
Discharge criteria
Most patients can be safely discharged. Once the facial rash appears, patients are no longer contagious and may return to school or work if clinically stable.
Issues for referral
Hematology referral for patients with hereditary anemias or aplastic crisis. Infectious disease consultation for immunocompromised patients. Obstetric referral for pregnant patients with confirmed or suspected acute infection.
Follow-up recommendations
Pregnant patients with new infection require serial ultrasounds for 10–12 weeks. Patients at risk for aplastic crisis should have repeat CBC testing within 1–2 days.
Patient education
There is no vaccine. Hand hygiene reduces transmission. Children are usually no longer contagious by the time the rash appears, so exclusion from school is generally unnecessary.
Complications
Transient aplastic crisis in patients with underlying anemias, chronic anemia in immunocompromised individuals, arthropathy in adults, rare neurologic or cardiac involvement, and pregnancy-related complications including hydrops fetalis and fetal loss.
Clinical pearls and common missteps
Parvovirus B19 infection is usually mild and self-limited. Patients are not contagious once the rash appears. Always evaluate patients with anemia or immunosuppression for complications. Confirm infection in pregnancy and ensure appropriate fetal monitoring.
Basic description
Erythema infectiosum is a characteristic viral exanthem, also known as fifth disease, historically the fifth most commonly described childhood rash. It typically presents with a mild viral prodrome followed by a “slapped-cheek” facial rash and a subsequent diffuse, lacy, reticular eruption, with or without arthropathy. It most commonly affects school-aged children younger than 14 years and is usually self-limited with lifelong immunity. Chronic or severe disease is rare but may occur in patients with congenital anemias or immunosuppression. Infection during pregnancy carries a risk of serious fetal complications.
Etiology
The condition is caused by human parvovirus B19, a small single-stranded DNA virus that infects human erythroid progenitor cells and transiently suppresses erythropoiesis. Transmission occurs via respiratory droplets, blood products, and vertical maternal–fetal spread. It is most common in late winter and spring. The incubation period ranges from 4 to 21 days, and patients are most contagious during the week before rash onset. Most adults have serologic evidence of prior infection.
Diagnosis – signs and symptoms
Young children typically develop a bright erythematous “slapped-cheek” rash accompanied by low-grade fever and malaise. Four to fourteen days later, a diffuse, pruritic, lacy rash may appear, most prominent on the extremities and usually sparing the palms and soles. Adolescents and adults may develop symmetric polyarthropathy, particularly involving small joints, while children more commonly experience knee involvement. Many patients remain asymptomatic or experience only mild viral symptoms.
History
Symptoms often begin with mild constitutional complaints such as fever, headache, nasal congestion, nausea, or sore throat. Patients are contagious only before the facial rash appears.
Physical examination
Stage one consists of coalescent, warm, erythematous, edematous facial papules with circumoral pallor. Stage two features a diffuse, maculopapular, reticular rash that may persist for weeks. Stage three is marked by fading of the rash with recurrence triggered by heat, sunlight, stress, or exercise, eventually resolving without scarring.
Essential workup
Diagnosis is clinical and based on classic presentation.
Diagnosis tests and interpretation
Laboratory testing is usually unnecessary. A CBC and reticulocyte count are indicated if aplastic crisis is suspected. In immunocompromised or pregnant patients, confirmation may be obtained with parvovirus B19 PCR or serology. IgM antibodies indicate acute infection, while IgG antibodies confirm immunity. Pregnant patients may require ultrasound monitoring for hydrops fetalis.
Differential diagnosis
Allergic reaction, drug eruption, nonspecific viral exanthem, measles, rubella, roseola, scarlet fever, erysipelas, infectious mononucleosis, collagen vascular disease, rheumatoid arthritis, sunburn, and enteroviral infections.
Treatment
The disease is typically self-limited and requires no specific therapy.
Prehospital care
Supportive care and standard ABCs for severe presentations.
Initial stabilization and therapy
Airway, breathing, and circulation management as needed. Supplemental oxygen and intravenous fluids may be required for severe dehydration. Severe anemia should be treated with packed red blood cell transfusion. Analgesia may be provided for arthropathy.
Emergency department treatment and procedures
No antiviral therapy or vaccine is available. Management is supportive, including antipyretics for fever, NSAIDs for joint pain if renal function permits, antihistamines for pruritus, and IV fluids when indicated. Immunocompromised patients with chronic infection or red cell aplasia may benefit from IVIG in consultation with infectious disease specialists. Hospitalization is indicated for aplastic crisis or severe complications.
Medication
Acetaminophen or ibuprofen for fever and pain. Diphenhydramine may be used for pruritus with caution regarding sedation. IVIG is reserved for select cases under specialist guidance.
Follow-up and disposition
Admission criteria
Aplastic crisis, severe anemia, hydrops fetalis, severe immunosuppression, toxic appearance, or debilitating arthritis.
Discharge criteria
Most patients can be safely discharged. Once the facial rash appears, patients are no longer contagious and may return to school or work if clinically stable.
Issues for referral
Hematology referral for patients with hereditary anemias or aplastic crisis. Infectious disease consultation for immunocompromised patients. Obstetric referral for pregnant patients with confirmed or suspected acute infection.
Follow-up recommendations
Pregnant patients with new infection require serial ultrasounds for 10–12 weeks. Patients at risk for aplastic crisis should have repeat CBC testing within 1–2 days.
Patient education
There is no vaccine. Hand hygiene reduces transmission. Children are usually no longer contagious by the time the rash appears, so exclusion from school is generally unnecessary.
Complications
Transient aplastic crisis in patients with underlying anemias, chronic anemia in immunocompromised individuals, arthropathy in adults, rare neurologic or cardiac involvement, and pregnancy-related complications including hydrops fetalis and fetal loss.
Clinical pearls and common missteps
Parvovirus B19 infection is usually mild and self-limited. Patients are not contagious once the rash appears. Always evaluate patients with anemia or immunosuppression for complications. Confirm infection in pregnancy and ensure appropriate fetal monitoring.
