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Emergency and Acute Medicine – Bipolar Disorder
Core Concepts And Definitions
Mania has a broad and often subtle presentation that may be difficult to recognize in the emergency setting. Manifestations range from irritability or cheerfulness to agitation, delirium, or frank psychosis, with the full extent of illness often revealed only through collateral history. Onset may be gradual or abrupt, with episodes typically lasting weeks to months and only rarely becoming chronic. Hypomania represents a milder form without marked functional impairment. Mixed mood states involve concurrent manic and depressive features and should be managed as mania in the emergency department. Bipolar disorder, formerly termed manic-depressive illness, is defined by one or more episodes of hypomania, mania, or mixed mood, often accompanied by depressive episodes. Bipolar II disorder refers to patients who experience hypomania but never full mania. The illness commonly begins in adolescence or early adulthood, with episodes varying widely in severity, duration, and frequency. Treatment responsiveness ranges from excellent to highly refractory. Schizoaffective disorder is characterized by mood episodes accompanied by psychotic symptoms that persist even during euthymic periods.
Etiologic Considerations
Bipolar disorder is most often a primary psychiatric illness with a strong genetic association. Secondary causes must be considered, particularly in patients over 40 years of age presenting with a first episode, atypical or mixed features, or altered sensorium. Medical, neurologic, endocrine, or toxicologic conditions may precipitate manic syndromes.
Clinical Features And Assessment
History should focus on recent manic symptoms, often requiring information from family or other informants. Key features include elevated, expansive, or irritable mood; increased energy and activity; reduced need for sleep; pressured speech; distractibility; racing thoughts; impulsivity; grandiosity; poor judgment; and engagement in high-risk behaviors. Past episodes of mania or depression, medication nonadherence, recent antidepressant initiation or discontinuation, substance use, and family history of bipolar disorder are critical elements. Medical history should assess for endocrine, metabolic, or neurologic disease and current or recent medications.
On examination, patients often appear hyperactive or agitated, with loud, rapid, or pressured speech. Affect is commonly irritable and labile, with intermittent tearfulness or dysphoria that may obscure diagnosis. Thought processes may be rapid, tangential, incoherent, or delirious. Thought content may include mood-congruent psychosis such as grandiose delusions or mood-incongruent psychotic features indistinguishable from other psychotic disorders. Judgment is typically impaired, with inflated self-esteem and uncharacteristic financial, sexual, or social indiscretions. Sensorium is usually intact, though confusion or delirium can occur.
Essential Evaluation
A focused physical and neurologic examination with vital signs is mandatory. Because mania can mimic delirium, a full medical evaluation may be required to exclude secondary causes.
Diagnostic Testing
Laboratory studies include toxicology screening, blood alcohol level, electrolytes, glucose, complete blood count, thyroid-stimulating hormone, and serum levels of lithium, carbamazepine, or valproate when relevant. Additional testing is guided by clinical context. Neuroimaging is reserved for suspected neurologic pathology.
Differential Diagnosis
Consider primary mania, schizoaffective disorder, psychotic disorders, agitated depression, personality disorders, attention-deficit disorder, conduct or impulse-control disorders, intoxication or withdrawal from alcohol or sedative-hypnotics, stimulant intoxication, medication-induced states including antidepressants, corticosteroids, thyroid hormone, anticholinergics, and antiparkinsonian agents, as well as metabolic, endocrine, infectious, inflammatory, vascular, neoplastic, and postictal neurologic conditions.
Initial Management And Safety Measures
Patients with mania carry a high risk of violence and impulsivity. Management begins with a calm, nonconfrontational approach in a low-stimulation environment, with adequate security support. Physical restraints and sedation may be required. Cooperative but agitated patients may be treated with oral antipsychotics or benzodiazepines. Uncooperative or severely agitated patients are commonly managed with combined haloperidol and lorazepam administered orally, intramuscularly, or intravenously, though monotherapy with either class may be appropriate. Alternative parenteral agents include lorazepam, olanzapine, ziprasidone, or chlorpromazine, with dose reductions in elderly or frail patients.
Emergency Department Treatment Strategies
Outpatient management may include short-term antipsychotics for symptom control, sleep-promoting agents, discontinuation of antidepressants if implicated, and initiation or resumption of mood stabilizers, recognizing that therapeutic effects may take days to weeks. Inpatient care is indicated for severe agitation, psychosis, unsafe behavior, or medical instability, with sedation and mood stabilizer initiation coordinated with psychiatry.
Pharmacologic Options
Acute agitation may be treated with lorazepam 2 mg orally or intramuscularly, repeatable as needed, or haloperidol 5 mg orally with similar repetition limits. Combination therapy using haloperidol 5 mg with lorazepam 1–2 mg is commonly effective. Parenteral alternatives include olanzapine, ziprasidone, aripiprazole, or chlorpromazine, with attention to hypotension and QT prolongation risks. Maintenance and outpatient medications include lithium, valproate, carbamazepine, lamotrigine, and atypical antipsychotics such as quetiapine, risperidone, olanzapine, and aripiprazole, often combined with benzodiazepines. Lamotrigine requires strict gradual titration to minimize risk of severe dermatologic reactions, particularly after interruptions. Pregnancy significantly complicates management, as lithium, valproate, and carbamazepine carry substantial teratogenic risk, especially early in gestation.
Disposition And Follow-Up
Involuntary hospitalization is required when patients pose a danger to themselves or others, exhibit severe impairment in self-care, display unsafe behaviors due to impaired judgment, or require diagnostic clarification. Patients with mild symptoms may be discharged if safety supports are in place, treatment adherence is likely, and prompt outpatient psychiatric follow-up within one to three days is arranged. Some patients may decline treatment despite not meeting criteria for involuntary commitment; education regarding future care options should be provided to patients and families.
Key Clinical Insights And Common Errors
Mania often presents with irritability or dysphoria rather than euphoria. Patients presenting with depression should always be screened for past or current manic or hypomanic symptoms, as misdiagnosis is common. Comorbid substance use is frequent and complicates management. Early identification of prodromal manic symptoms may prevent full episodes. In children, bipolar disorder frequently manifests as behavioral disinhibition or persistent irritability rather than classic mood elevation.
Core Concepts And Definitions
Mania has a broad and often subtle presentation that may be difficult to recognize in the emergency setting. Manifestations range from irritability or cheerfulness to agitation, delirium, or frank psychosis, with the full extent of illness often revealed only through collateral history. Onset may be gradual or abrupt, with episodes typically lasting weeks to months and only rarely becoming chronic. Hypomania represents a milder form without marked functional impairment. Mixed mood states involve concurrent manic and depressive features and should be managed as mania in the emergency department. Bipolar disorder, formerly termed manic-depressive illness, is defined by one or more episodes of hypomania, mania, or mixed mood, often accompanied by depressive episodes. Bipolar II disorder refers to patients who experience hypomania but never full mania. The illness commonly begins in adolescence or early adulthood, with episodes varying widely in severity, duration, and frequency. Treatment responsiveness ranges from excellent to highly refractory. Schizoaffective disorder is characterized by mood episodes accompanied by psychotic symptoms that persist even during euthymic periods.
Etiologic Considerations
Bipolar disorder is most often a primary psychiatric illness with a strong genetic association. Secondary causes must be considered, particularly in patients over 40 years of age presenting with a first episode, atypical or mixed features, or altered sensorium. Medical, neurologic, endocrine, or toxicologic conditions may precipitate manic syndromes.
Clinical Features And Assessment
History should focus on recent manic symptoms, often requiring information from family or other informants. Key features include elevated, expansive, or irritable mood; increased energy and activity; reduced need for sleep; pressured speech; distractibility; racing thoughts; impulsivity; grandiosity; poor judgment; and engagement in high-risk behaviors. Past episodes of mania or depression, medication nonadherence, recent antidepressant initiation or discontinuation, substance use, and family history of bipolar disorder are critical elements. Medical history should assess for endocrine, metabolic, or neurologic disease and current or recent medications.
On examination, patients often appear hyperactive or agitated, with loud, rapid, or pressured speech. Affect is commonly irritable and labile, with intermittent tearfulness or dysphoria that may obscure diagnosis. Thought processes may be rapid, tangential, incoherent, or delirious. Thought content may include mood-congruent psychosis such as grandiose delusions or mood-incongruent psychotic features indistinguishable from other psychotic disorders. Judgment is typically impaired, with inflated self-esteem and uncharacteristic financial, sexual, or social indiscretions. Sensorium is usually intact, though confusion or delirium can occur.
Essential Evaluation
A focused physical and neurologic examination with vital signs is mandatory. Because mania can mimic delirium, a full medical evaluation may be required to exclude secondary causes.
Diagnostic Testing
Laboratory studies include toxicology screening, blood alcohol level, electrolytes, glucose, complete blood count, thyroid-stimulating hormone, and serum levels of lithium, carbamazepine, or valproate when relevant. Additional testing is guided by clinical context. Neuroimaging is reserved for suspected neurologic pathology.
Differential Diagnosis
Consider primary mania, schizoaffective disorder, psychotic disorders, agitated depression, personality disorders, attention-deficit disorder, conduct or impulse-control disorders, intoxication or withdrawal from alcohol or sedative-hypnotics, stimulant intoxication, medication-induced states including antidepressants, corticosteroids, thyroid hormone, anticholinergics, and antiparkinsonian agents, as well as metabolic, endocrine, infectious, inflammatory, vascular, neoplastic, and postictal neurologic conditions.
Initial Management And Safety Measures
Patients with mania carry a high risk of violence and impulsivity. Management begins with a calm, nonconfrontational approach in a low-stimulation environment, with adequate security support. Physical restraints and sedation may be required. Cooperative but agitated patients may be treated with oral antipsychotics or benzodiazepines. Uncooperative or severely agitated patients are commonly managed with combined haloperidol and lorazepam administered orally, intramuscularly, or intravenously, though monotherapy with either class may be appropriate. Alternative parenteral agents include lorazepam, olanzapine, ziprasidone, or chlorpromazine, with dose reductions in elderly or frail patients.
Emergency Department Treatment Strategies
Outpatient management may include short-term antipsychotics for symptom control, sleep-promoting agents, discontinuation of antidepressants if implicated, and initiation or resumption of mood stabilizers, recognizing that therapeutic effects may take days to weeks. Inpatient care is indicated for severe agitation, psychosis, unsafe behavior, or medical instability, with sedation and mood stabilizer initiation coordinated with psychiatry.
Pharmacologic Options
Acute agitation may be treated with lorazepam 2 mg orally or intramuscularly, repeatable as needed, or haloperidol 5 mg orally with similar repetition limits. Combination therapy using haloperidol 5 mg with lorazepam 1–2 mg is commonly effective. Parenteral alternatives include olanzapine, ziprasidone, aripiprazole, or chlorpromazine, with attention to hypotension and QT prolongation risks. Maintenance and outpatient medications include lithium, valproate, carbamazepine, lamotrigine, and atypical antipsychotics such as quetiapine, risperidone, olanzapine, and aripiprazole, often combined with benzodiazepines. Lamotrigine requires strict gradual titration to minimize risk of severe dermatologic reactions, particularly after interruptions. Pregnancy significantly complicates management, as lithium, valproate, and carbamazepine carry substantial teratogenic risk, especially early in gestation.
Disposition And Follow-Up
Involuntary hospitalization is required when patients pose a danger to themselves or others, exhibit severe impairment in self-care, display unsafe behaviors due to impaired judgment, or require diagnostic clarification. Patients with mild symptoms may be discharged if safety supports are in place, treatment adherence is likely, and prompt outpatient psychiatric follow-up within one to three days is arranged. Some patients may decline treatment despite not meeting criteria for involuntary commitment; education regarding future care options should be provided to patients and families.
Key Clinical Insights And Common Errors
Mania often presents with irritability or dysphoria rather than euphoria. Patients presenting with depression should always be screened for past or current manic or hypomanic symptoms, as misdiagnosis is common. Comorbid substance use is frequent and complicates management. Early identification of prodromal manic symptoms may prevent full episodes. In children, bipolar disorder frequently manifests as behavioral disinhibition or persistent irritability rather than classic mood elevation.
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Emergency and Acute Medicine – Animal Bite
Overview
Most animal bites are provoked. Dogs cause the majority of bites, with large dogs responsible for the most severe injuries; pit bulls account for the highest number of fatalities. Children represent about 70% of fatalities, most often from bites to the face or neck. The majority of dog bites involve animals owned by family or friends. Cat bites usually involve household pets and have a high infection rate, approximately 50% among those seeking care, because of deep puncture wounds. Rat bites occur mainly in laboratory workers or children of low socioeconomic status. Rabies transmission from rats is rare, and prophylaxis is not routinely indicated.
Special Syndromes
Catscratch disease (CSD) is diagnosed when three of four criteria are present: contact with a cat and a scratch or inoculation lesion, positive catscratch skin test, characteristic lymph node histopathology, and exclusion of other causes of lymphadenopathy. Rat-bite fever (RBF) is uncommon in the United States but carries a high mortality rate and does not require an actual bite, as transmission may occur through handling rats.
Microbiology and Etiology
Dog and cat bites commonly involve Pasteurella multocida, found twice as often in cat bites as dog bites and present in up to 80% of cat bite infections, typically within 24 hours. Staphylococcus and Streptococcus infections usually appear after 24 hours. Other pathogens include anaerobes and Capnocytophaga canimorsus (dog bites). Catscratch disease is caused by Bartonella henselae. Rat-bite fever is caused by Spirillum minus and Streptobacillus moniliformis.
Epidemiology of Bites
Dog bites account for 80–90% of all mammalian bites, cat bites 5–15%, human bites 2–5%, and rat bites 2–3%.
Clinical Presentation
Dog bites most commonly cause crush injuries but may also produce tears, avulsions, punctures, and scratches. Infection rates are lower than with cat or human bites and typically present with cellulitis, malodorous gray discharge, fever, and lymphadenopathy. Cat bites usually cause puncture wounds and have infection rates of 30–50%. Catscratch disease begins with a small macule or vesicle that becomes a papule within 3–10 days, followed weeks later by tender, nonsuppurative regional lymphadenopathy that resolves over 2–4 months, often with low-grade fever and malaise. Rat-bite fever due to S. moniliformis presents 2–10 days after exposure with fever, rigors, migratory polyarthralgias, headache, nausea, and vomiting; S. minus has a 1–3 week incubation and is more common in Asia.
History and Examination
History should include animal behavior, provocation, ownership, location, time since injury, tetanus status, allergies, and immunocompromising conditions. Examination must document wound location and extent, swelling, crush injury, devitalized tissue, range of motion, tendon and nerve function, joint or bone involvement, and signs of infection including regional adenopathy.
Diagnostic Evaluation
Aerobic and anaerobic cultures are indicated for infected wounds but not for clinically uninfected bites. Catscratch disease may be confirmed by elevated Bartonella henselae titers or a positive catscratch antigen skin test, defined as induration ≥5 mm at 48–72 hours. Plain radiographs are indicated for suspected fractures, foreign bodies such as teeth, baseline evaluation of bone or joint space violation, and infection near bone or joints to assess for osteomyelitis.
Differential Diagnosis
Consider human bites, other animal bites, reactive lymphadenopathy, chronic lymphadenitis, infection, drug reactions, malignancy, and congenital causes of lymphadenopathy.
Prehospital and Initial Care
Apply direct pressure to control bleeding. In the emergency department, prioritize hemostasis and airway stabilization for bites to the face or neck.
Emergency Department Management
Irrigate wounds copiously with normal saline using an 18-gauge plastic catheter directed along the wound tract; avoid forceful injection into tissue planes. Débride foreign material, necrotic tissue, and eschar, but do not débride puncture wounds. Wound closure increases infection risk and must be individualized. Do not close infected wounds or wounds older than 24 hours. Facial wounds may be closed with patient counseling regarding infection risk. Infected wounds, delayed presentations, and deep hand wounds should be left open, with delayed primary closure if appropriate.
Antibiotic Therapy
Antibiotics are indicated for infected wounds, cat bites, hand injuries, crush injuries, puncture wounds, full-thickness wounds of hand, face, or lower extremity, wounds involving joints, tendons, ligaments, or fractures, immunocompromised patients, wounds requiring surgical débridement, and presentations more than 8 hours after injury. Elevate the affected extremity.
Tetanus and Rabies Prophylaxis
Update tetanus prophylaxis as indicated. Rabies prophylaxis is unnecessary unless rabies is suspected. Rodents and rabbits rarely transmit rabies; skunks, raccoons, bats, and foxes are major reservoirs.
Condition-Specific Treatment
Catscratch disease is usually self-limited; provide analgesia, local heat, and avoid lymph node trauma. Antibiotics are controversial but may be considered in severe disease or immunocompromised patients. Rat-bite fever requires IV penicillin or doxycycline due to significant mortality risk.
Medications
First-line options include amoxicillin–clavulanate orally, ampicillin–sulbactam IV, penicillin IV, piperacillin–tazobactam IV, ticarcillin–clavulanate IV, or ceftriaxone plus metronidazole. Second-line regimens involve combination therapy with trimethoprim–sulfamethoxazole, penicillin VK, ciprofloxacin, or doxycycline plus anaerobic coverage with clindamycin or metronidazole.
Disposition
Admit patients with infected wounds at presentation, severe or progressive cellulitis or lymphangitis, systemic infection, failure of outpatient therapy, or severe catscratch disease with prolonged fever or marked lymphadenopathy. Healthy patients with localized infection may be discharged on antibiotics with 24-hour follow-up. Noninfected wounds require follow-up within 48 hours.
Follow-Up and Referral
Refer infected hand wounds to a hand specialist. Ensure close follow-up as outlined above.
Key Clinical Cautions
Animal bites are reportable to authorities in many jurisdictions.
Overview
Most animal bites are provoked. Dogs cause the majority of bites, with large dogs responsible for the most severe injuries; pit bulls account for the highest number of fatalities. Children represent about 70% of fatalities, most often from bites to the face or neck. The majority of dog bites involve animals owned by family or friends. Cat bites usually involve household pets and have a high infection rate, approximately 50% among those seeking care, because of deep puncture wounds. Rat bites occur mainly in laboratory workers or children of low socioeconomic status. Rabies transmission from rats is rare, and prophylaxis is not routinely indicated.
Special Syndromes
Catscratch disease (CSD) is diagnosed when three of four criteria are present: contact with a cat and a scratch or inoculation lesion, positive catscratch skin test, characteristic lymph node histopathology, and exclusion of other causes of lymphadenopathy. Rat-bite fever (RBF) is uncommon in the United States but carries a high mortality rate and does not require an actual bite, as transmission may occur through handling rats.
Microbiology and Etiology
Dog and cat bites commonly involve Pasteurella multocida, found twice as often in cat bites as dog bites and present in up to 80% of cat bite infections, typically within 24 hours. Staphylococcus and Streptococcus infections usually appear after 24 hours. Other pathogens include anaerobes and Capnocytophaga canimorsus (dog bites). Catscratch disease is caused by Bartonella henselae. Rat-bite fever is caused by Spirillum minus and Streptobacillus moniliformis.
Epidemiology of Bites
Dog bites account for 80–90% of all mammalian bites, cat bites 5–15%, human bites 2–5%, and rat bites 2–3%.
Clinical Presentation
Dog bites most commonly cause crush injuries but may also produce tears, avulsions, punctures, and scratches. Infection rates are lower than with cat or human bites and typically present with cellulitis, malodorous gray discharge, fever, and lymphadenopathy. Cat bites usually cause puncture wounds and have infection rates of 30–50%. Catscratch disease begins with a small macule or vesicle that becomes a papule within 3–10 days, followed weeks later by tender, nonsuppurative regional lymphadenopathy that resolves over 2–4 months, often with low-grade fever and malaise. Rat-bite fever due to S. moniliformis presents 2–10 days after exposure with fever, rigors, migratory polyarthralgias, headache, nausea, and vomiting; S. minus has a 1–3 week incubation and is more common in Asia.
History and Examination
History should include animal behavior, provocation, ownership, location, time since injury, tetanus status, allergies, and immunocompromising conditions. Examination must document wound location and extent, swelling, crush injury, devitalized tissue, range of motion, tendon and nerve function, joint or bone involvement, and signs of infection including regional adenopathy.
Diagnostic Evaluation
Aerobic and anaerobic cultures are indicated for infected wounds but not for clinically uninfected bites. Catscratch disease may be confirmed by elevated Bartonella henselae titers or a positive catscratch antigen skin test, defined as induration ≥5 mm at 48–72 hours. Plain radiographs are indicated for suspected fractures, foreign bodies such as teeth, baseline evaluation of bone or joint space violation, and infection near bone or joints to assess for osteomyelitis.
Differential Diagnosis
Consider human bites, other animal bites, reactive lymphadenopathy, chronic lymphadenitis, infection, drug reactions, malignancy, and congenital causes of lymphadenopathy.
Prehospital and Initial Care
Apply direct pressure to control bleeding. In the emergency department, prioritize hemostasis and airway stabilization for bites to the face or neck.
Emergency Department Management
Irrigate wounds copiously with normal saline using an 18-gauge plastic catheter directed along the wound tract; avoid forceful injection into tissue planes. Débride foreign material, necrotic tissue, and eschar, but do not débride puncture wounds. Wound closure increases infection risk and must be individualized. Do not close infected wounds or wounds older than 24 hours. Facial wounds may be closed with patient counseling regarding infection risk. Infected wounds, delayed presentations, and deep hand wounds should be left open, with delayed primary closure if appropriate.
Antibiotic Therapy
Antibiotics are indicated for infected wounds, cat bites, hand injuries, crush injuries, puncture wounds, full-thickness wounds of hand, face, or lower extremity, wounds involving joints, tendons, ligaments, or fractures, immunocompromised patients, wounds requiring surgical débridement, and presentations more than 8 hours after injury. Elevate the affected extremity.
Tetanus and Rabies Prophylaxis
Update tetanus prophylaxis as indicated. Rabies prophylaxis is unnecessary unless rabies is suspected. Rodents and rabbits rarely transmit rabies; skunks, raccoons, bats, and foxes are major reservoirs.
Condition-Specific Treatment
Catscratch disease is usually self-limited; provide analgesia, local heat, and avoid lymph node trauma. Antibiotics are controversial but may be considered in severe disease or immunocompromised patients. Rat-bite fever requires IV penicillin or doxycycline due to significant mortality risk.
Medications
First-line options include amoxicillin–clavulanate orally, ampicillin–sulbactam IV, penicillin IV, piperacillin–tazobactam IV, ticarcillin–clavulanate IV, or ceftriaxone plus metronidazole. Second-line regimens involve combination therapy with trimethoprim–sulfamethoxazole, penicillin VK, ciprofloxacin, or doxycycline plus anaerobic coverage with clindamycin or metronidazole.
Disposition
Admit patients with infected wounds at presentation, severe or progressive cellulitis or lymphangitis, systemic infection, failure of outpatient therapy, or severe catscratch disease with prolonged fever or marked lymphadenopathy. Healthy patients with localized infection may be discharged on antibiotics with 24-hour follow-up. Noninfected wounds require follow-up within 48 hours.
Follow-Up and Referral
Refer infected hand wounds to a hand specialist. Ensure close follow-up as outlined above.
Key Clinical Cautions
Animal bites are reportable to authorities in many jurisdictions.
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Emergency and Acute Medicine – Human Bite
Overview
Human bites are the third most common type of bite injury, following dog and cat bites. Up to 75% occur during aggressive encounters, while 15–20% are related to sexual activity (“love nips”). Human bites carry a higher risk of infection than animal bites because of the dense oral bacterial flora.
Types of Human Bites
Occlusional bites occur when human teeth directly bite the skin, producing lacerations or crush injuries; these are more prone to infection than animal bites. Clenched-fist injuries (CFIs), also known as fight bites, are the most serious form. They typically present as small wounds over the metacarpophalangeal joints of the dominant hand and occur when a clenched fist strikes another person’s teeth. When the hand relaxes, the puncture site may seal, trapping oral bacteria within the joint. Tendons can carry bacteria into deeper potential spaces of the hand, markedly increasing the risk of deep and extensive infection.
Microbiology and Etiology
Human bite infections are polymicrobial, involving aerobic and anaerobic organisms. The most common pathogens are Streptococcus and Staphylococcus species. Other organisms include Eikenella corrodens, Haemophilus influenzae, Peptostreptococcus, and Corynebacterium. E. corrodens exhibits synergism with Streptococcus, Staphylococcus aureus, Bacteroides, and gram-negative organisms. Although rare, viral transmission through human bites has been reported, including hepatitis viruses, HIV, and herpes simplex virus.
Clinical Presentation
Most human bites involve the upper extremities (60–75%), followed by the head and neck (15–20%), trunk (10–20%), and lower extremities (approximately 5%). Common complications include cellulitis, deep-space infections such as septic arthritis and osteomyelitis, fractures, and tendon injuries. Hand bites have the highest infection rates.
History and Examination
History should include the time of injury, patient allergies, immune status, tetanus immunization status, and HIV or hepatitis B status of the person inflicting the bite, if known. On examination, carefully document wound location and extent, swelling, crush injury, devitalized tissue, range of motion, tendon and nerve function, signs of infection including regional adenopathy, and any joint or bone involvement.
Essential Evaluation
A meticulous examination is critical, especially for clenched-fist injuries. The deepest part of the wound must be examined while the fingers are taken through a full range of motion to identify extensor tendon lacerations or joint capsule violation.
Diagnostic Testing
Aerobic and anaerobic cultures should be obtained from clinically infected wounds; cultures are not indicated for noninfected bites. CBC is appropriate when there are signs of significant infection. Electrolytes, glucose, BUN, and creatinine should be checked in diabetic patients or those with severe infections. Imaging is usually unnecessary, but plain radiographs are indicated for suspected fractures, foreign bodies such as teeth, baseline evaluation when bone or joint space is violated, or infection near bone or joint spaces. Ultrasound may help differentiate abscess from cellulitis.
Differential Diagnosis and Special Considerations
Animal bites typically cause more punctures and lacerations, whereas human bites more often produce crush injuries. In suspected sexual abuse, look for central bruising or “hickeys,” linear abrasions or bruises on both dorsal and palmar or plantar surfaces, and multiple lesions on different extremities. An intercanine distance greater than 3 cm suggests permanent dentition and an attacker older than 8 years. If abuse is suspected, collect saliva using a saline-moistened swab placed in a paper envelope, obtain photographs, and notify authorities.
Prehospital and Initial Management
Control bleeding with direct pressure. Ensure airway patency and adequate tissue perfusion.
Emergency Department Management
Irrigate wounds copiously with normal saline using an 18-gauge needle or plastic catheter directed along the wound tract, avoiding forceful injection into tissues. Débride foreign material, necrotic tissue, and devitalized skin, but do not débride puncture wounds. Remove eschar to allow drainage and irrigation of underlying pus.
Clenched-fist injuries require immobilization and splinting in a functional position with bulky hand dressing, elevation, and early consultation with a hand surgeon for possible operative irrigation and exploration. Use a sling for outpatients and tubular stockinette suspension for inpatients. Do not perform primary repair of avulsion wounds.
Wound Closure
Primary closure increases infection risk and should be avoided in infected wounds or those older than 24 hours. Closure of wounds older than 8 hours is controversial. Facial wounds may be closed up to 24 hours after injury with counseling regarding infection risk. Infected wounds and those presenting after 24 hours should be left open, with possible delayed primary closure or approximation using Steri-Strips. Clenched-fist injuries should never be sutured.
Antibiotic Therapy and Prophylaxis
Prophylactic antibiotics are controversial for low-risk bites but are recommended for moderate to severe injuries, crush injuries with edema, bone or joint involvement, hand bites, wounds near prosthetic joints, and patients with diabetes, prior splenectomy, or immunosuppression. Tetanus prophylaxis should be updated as indicated. Refer patients for possible HIV testing and surveillance when appropriate.
Medications
First-line therapy includes amoxicillin–clavulanate orally, ampicillin–sulbactam IV, piperacillin–tazobactam IV, ticarcillin–clavulanate IV, or ceftriaxone plus metronidazole. Second-line regimens involve combination therapy with trimethoprim–sulfamethoxazole, penicillin VK, ciprofloxacin, or doxycycline, each combined with anaerobic coverage using clindamycin or metronidazole.
Disposition
Admission is indicated for infected wounds at presentation, severe or progressive cellulitis or lymphangitis, systemic infection, or failure of outpatient antibiotics. Healthy patients with localized infection may be discharged on antibiotics with 24-hour follow-up, while noninfected wounds require reassessment within 48 hours.
Special Populations
In geriatric patients, human bite marks rarely occur accidentally and should raise concern for elder abuse. In pediatric patients, human bite marks are also uncommon and suggest possible abuse; an intercanine distance greater than 3 cm indicates an adult attacker.
Follow-Up and Referral
All infected hand wounds require hand specialist follow-up. Suspected child abuse mandates referral to appropriate authorities.
Key Clinical Cautions
Always examine clenched-fist wounds through full finger motion to detect tendon or joint involvement. Early hand surgery consultation is essential for all clenched-fist injuries because of their high infection rate.
Overview
Human bites are the third most common type of bite injury, following dog and cat bites. Up to 75% occur during aggressive encounters, while 15–20% are related to sexual activity (“love nips”). Human bites carry a higher risk of infection than animal bites because of the dense oral bacterial flora.
Types of Human Bites
Occlusional bites occur when human teeth directly bite the skin, producing lacerations or crush injuries; these are more prone to infection than animal bites. Clenched-fist injuries (CFIs), also known as fight bites, are the most serious form. They typically present as small wounds over the metacarpophalangeal joints of the dominant hand and occur when a clenched fist strikes another person’s teeth. When the hand relaxes, the puncture site may seal, trapping oral bacteria within the joint. Tendons can carry bacteria into deeper potential spaces of the hand, markedly increasing the risk of deep and extensive infection.
Microbiology and Etiology
Human bite infections are polymicrobial, involving aerobic and anaerobic organisms. The most common pathogens are Streptococcus and Staphylococcus species. Other organisms include Eikenella corrodens, Haemophilus influenzae, Peptostreptococcus, and Corynebacterium. E. corrodens exhibits synergism with Streptococcus, Staphylococcus aureus, Bacteroides, and gram-negative organisms. Although rare, viral transmission through human bites has been reported, including hepatitis viruses, HIV, and herpes simplex virus.
Clinical Presentation
Most human bites involve the upper extremities (60–75%), followed by the head and neck (15–20%), trunk (10–20%), and lower extremities (approximately 5%). Common complications include cellulitis, deep-space infections such as septic arthritis and osteomyelitis, fractures, and tendon injuries. Hand bites have the highest infection rates.
History and Examination
History should include the time of injury, patient allergies, immune status, tetanus immunization status, and HIV or hepatitis B status of the person inflicting the bite, if known. On examination, carefully document wound location and extent, swelling, crush injury, devitalized tissue, range of motion, tendon and nerve function, signs of infection including regional adenopathy, and any joint or bone involvement.
Essential Evaluation
A meticulous examination is critical, especially for clenched-fist injuries. The deepest part of the wound must be examined while the fingers are taken through a full range of motion to identify extensor tendon lacerations or joint capsule violation.
Diagnostic Testing
Aerobic and anaerobic cultures should be obtained from clinically infected wounds; cultures are not indicated for noninfected bites. CBC is appropriate when there are signs of significant infection. Electrolytes, glucose, BUN, and creatinine should be checked in diabetic patients or those with severe infections. Imaging is usually unnecessary, but plain radiographs are indicated for suspected fractures, foreign bodies such as teeth, baseline evaluation when bone or joint space is violated, or infection near bone or joint spaces. Ultrasound may help differentiate abscess from cellulitis.
Differential Diagnosis and Special Considerations
Animal bites typically cause more punctures and lacerations, whereas human bites more often produce crush injuries. In suspected sexual abuse, look for central bruising or “hickeys,” linear abrasions or bruises on both dorsal and palmar or plantar surfaces, and multiple lesions on different extremities. An intercanine distance greater than 3 cm suggests permanent dentition and an attacker older than 8 years. If abuse is suspected, collect saliva using a saline-moistened swab placed in a paper envelope, obtain photographs, and notify authorities.
Prehospital and Initial Management
Control bleeding with direct pressure. Ensure airway patency and adequate tissue perfusion.
Emergency Department Management
Irrigate wounds copiously with normal saline using an 18-gauge needle or plastic catheter directed along the wound tract, avoiding forceful injection into tissues. Débride foreign material, necrotic tissue, and devitalized skin, but do not débride puncture wounds. Remove eschar to allow drainage and irrigation of underlying pus.
Clenched-fist injuries require immobilization and splinting in a functional position with bulky hand dressing, elevation, and early consultation with a hand surgeon for possible operative irrigation and exploration. Use a sling for outpatients and tubular stockinette suspension for inpatients. Do not perform primary repair of avulsion wounds.
Wound Closure
Primary closure increases infection risk and should be avoided in infected wounds or those older than 24 hours. Closure of wounds older than 8 hours is controversial. Facial wounds may be closed up to 24 hours after injury with counseling regarding infection risk. Infected wounds and those presenting after 24 hours should be left open, with possible delayed primary closure or approximation using Steri-Strips. Clenched-fist injuries should never be sutured.
Antibiotic Therapy and Prophylaxis
Prophylactic antibiotics are controversial for low-risk bites but are recommended for moderate to severe injuries, crush injuries with edema, bone or joint involvement, hand bites, wounds near prosthetic joints, and patients with diabetes, prior splenectomy, or immunosuppression. Tetanus prophylaxis should be updated as indicated. Refer patients for possible HIV testing and surveillance when appropriate.
Medications
First-line therapy includes amoxicillin–clavulanate orally, ampicillin–sulbactam IV, piperacillin–tazobactam IV, ticarcillin–clavulanate IV, or ceftriaxone plus metronidazole. Second-line regimens involve combination therapy with trimethoprim–sulfamethoxazole, penicillin VK, ciprofloxacin, or doxycycline, each combined with anaerobic coverage using clindamycin or metronidazole.
Disposition
Admission is indicated for infected wounds at presentation, severe or progressive cellulitis or lymphangitis, systemic infection, or failure of outpatient antibiotics. Healthy patients with localized infection may be discharged on antibiotics with 24-hour follow-up, while noninfected wounds require reassessment within 48 hours.
Special Populations
In geriatric patients, human bite marks rarely occur accidentally and should raise concern for elder abuse. In pediatric patients, human bite marks are also uncommon and suggest possible abuse; an intercanine distance greater than 3 cm indicates an adult attacker.
Follow-Up and Referral
All infected hand wounds require hand specialist follow-up. Suspected child abuse mandates referral to appropriate authorities.
Key Clinical Cautions
Always examine clenched-fist wounds through full finger motion to detect tendon or joint involvement. Early hand surgery consultation is essential for all clenched-fist injuries because of their high infection rate.
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Emergency and Acute Medicine – Bladder Injury
Overview and Definitions
Bladder injury most commonly results from blunt trauma. Approximately 10% of patients with pelvic fractures sustain significant bladder injury, and 80–90% of bladder ruptures are associated with pelvic fractures. Overall mortality ranges from 17–22%, increasing to nearly 60% in combined intraperitoneal and extraperitoneal ruptures.
Etiology and Classification
Trauma accounts for about 82% of bladder injuries. Blunt mechanisms include motor vehicle accidents (87%), falls (7%), and assault (6%). Penetrating injuries are most often due to gunshot wounds (85%) and stabbings (15%). Iatrogenic causes account for 14% and include TURP, urologic, gynecologic, obstetric, abdominal, and orthopedic hip procedures, biopsies, indwelling Foley catheters, and IUD placement. Intoxication accounts for 2.9%, and spontaneous rupture occurs in less than 1%.
Extraperitoneal rupture (62%) is usually associated with pelvic fractures and results from blunt force or bone fragments. Intraperitoneal rupture (25%) occurs from direct compression of a distended bladder, typically involving the bladder dome. Combined intraperitoneal and extraperitoneal rupture (12%) carries the highest mortality due to associated injuries. Bladder contusion involves injury to the endothelial lining or muscularis with an intact bladder wall and may cause gross hematuria with normal imaging; it usually resolves without intervention.
In children, the bladder is intra-abdominal until late adolescence, making intraperitoneal rupture more common and overall bladder injury more frequent due to a less rigid pelvis.
Clinical Presentation
The classic triad includes gross hematuria, suprapubic pain, and difficulty voiding. History should focus on traumatic mechanism or recent procedures. On examination, the urethral meatus must be inspected; if blood is present, Foley catheter placement should be deferred until a retrograde urethrogram is performed, as concomitant urethral injury occurs in 10–29% of cases.
Evaluation and Diagnostic Testing
Initial evaluation includes urinalysis, which shows gross hematuria in 95–100% of significant injuries and microscopic hematuria in about 5%. BUN may be elevated due to intraperitoneal urine resorption, and electrolyte abnormalities such as hyperkalemia or hypernatremia may be present.
Retrograde cystography or CT cystography is the diagnostic modality of choice, with sensitivity around 95% and specificity near 100%. If urethral injury is suspected, a retrograde urethrogram is performed first. Proper cystography requires adequate bladder distension with diluted contrast and postdrainage imaging, as up to 10% of ruptures are detected only after bladder emptying. Extraperitoneal ruptures show teardrop- or star-shaped extravasation, whereas intraperitoneal ruptures demonstrate contrast outlining bowel loops or filling paracolic gutters. FAST examination showing free pelvic fluid should heighten suspicion for bladder injury.
Differential Diagnosis
Consider peritoneal trauma, urethral injury, and renal or ureteral trauma.
Management
Prehospital bladder catheterization should be avoided. Initial management follows standard ABCs with early urologic consultation. Extraperitoneal nonpenetrating ruptures may be managed with Foley catheter drainage (20F or larger) for approximately 14 days, with most lacerations sealing within 3 weeks; surgical repair is recommended if the patient is undergoing pelvic or abdominal surgery for other injuries. Intraperitoneal ruptures require surgical exploration and repair. Bladder contusions require no specific intervention. Broad-spectrum antibiotics are indicated for intraperitoneal rupture.
Disposition and Follow-Up
Admission is required for patients with associated major trauma or those needing surgical intervention. Bladder contusions without rupture and without other injuries may be discharged. Most bladder ruptures require admission, and discharge should occur only after urologic clearance. Urology follow-up is required for all outpatient-managed injuries, with Foley catheter removal typically at 14 days for conservatively managed extraperitoneal ruptures.
Clinical Insights and Common Errors
Free pelvic fluid on CT or ultrasound should prompt concern for bladder injury. Unresponsive, intoxicated, or altered patients require careful evaluation. Any penetrating injury to the lower abdomen with hematuria warrants cystography.
Overview and Definitions
Bladder injury most commonly results from blunt trauma. Approximately 10% of patients with pelvic fractures sustain significant bladder injury, and 80–90% of bladder ruptures are associated with pelvic fractures. Overall mortality ranges from 17–22%, increasing to nearly 60% in combined intraperitoneal and extraperitoneal ruptures.
Etiology and Classification
Trauma accounts for about 82% of bladder injuries. Blunt mechanisms include motor vehicle accidents (87%), falls (7%), and assault (6%). Penetrating injuries are most often due to gunshot wounds (85%) and stabbings (15%). Iatrogenic causes account for 14% and include TURP, urologic, gynecologic, obstetric, abdominal, and orthopedic hip procedures, biopsies, indwelling Foley catheters, and IUD placement. Intoxication accounts for 2.9%, and spontaneous rupture occurs in less than 1%.
Extraperitoneal rupture (62%) is usually associated with pelvic fractures and results from blunt force or bone fragments. Intraperitoneal rupture (25%) occurs from direct compression of a distended bladder, typically involving the bladder dome. Combined intraperitoneal and extraperitoneal rupture (12%) carries the highest mortality due to associated injuries. Bladder contusion involves injury to the endothelial lining or muscularis with an intact bladder wall and may cause gross hematuria with normal imaging; it usually resolves without intervention.
In children, the bladder is intra-abdominal until late adolescence, making intraperitoneal rupture more common and overall bladder injury more frequent due to a less rigid pelvis.
Clinical Presentation
The classic triad includes gross hematuria, suprapubic pain, and difficulty voiding. History should focus on traumatic mechanism or recent procedures. On examination, the urethral meatus must be inspected; if blood is present, Foley catheter placement should be deferred until a retrograde urethrogram is performed, as concomitant urethral injury occurs in 10–29% of cases.
Evaluation and Diagnostic Testing
Initial evaluation includes urinalysis, which shows gross hematuria in 95–100% of significant injuries and microscopic hematuria in about 5%. BUN may be elevated due to intraperitoneal urine resorption, and electrolyte abnormalities such as hyperkalemia or hypernatremia may be present.
Retrograde cystography or CT cystography is the diagnostic modality of choice, with sensitivity around 95% and specificity near 100%. If urethral injury is suspected, a retrograde urethrogram is performed first. Proper cystography requires adequate bladder distension with diluted contrast and postdrainage imaging, as up to 10% of ruptures are detected only after bladder emptying. Extraperitoneal ruptures show teardrop- or star-shaped extravasation, whereas intraperitoneal ruptures demonstrate contrast outlining bowel loops or filling paracolic gutters. FAST examination showing free pelvic fluid should heighten suspicion for bladder injury.
Differential Diagnosis
Consider peritoneal trauma, urethral injury, and renal or ureteral trauma.
Management
Prehospital bladder catheterization should be avoided. Initial management follows standard ABCs with early urologic consultation. Extraperitoneal nonpenetrating ruptures may be managed with Foley catheter drainage (20F or larger) for approximately 14 days, with most lacerations sealing within 3 weeks; surgical repair is recommended if the patient is undergoing pelvic or abdominal surgery for other injuries. Intraperitoneal ruptures require surgical exploration and repair. Bladder contusions require no specific intervention. Broad-spectrum antibiotics are indicated for intraperitoneal rupture.
Disposition and Follow-Up
Admission is required for patients with associated major trauma or those needing surgical intervention. Bladder contusions without rupture and without other injuries may be discharged. Most bladder ruptures require admission, and discharge should occur only after urologic clearance. Urology follow-up is required for all outpatient-managed injuries, with Foley catheter removal typically at 14 days for conservatively managed extraperitoneal ruptures.
Clinical Insights and Common Errors
Free pelvic fluid on CT or ultrasound should prompt concern for bladder injury. Unresponsive, intoxicated, or altered patients require careful evaluation. Any penetrating injury to the lower abdomen with hematuria warrants cystography.
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Emergency and Acute Medicine – Botulism
Overview And Definitions
Botulism is a rare but highly lethal neuroparalytic illness in the United States, with fewer than 200 cases annually, yet it carries major bioterrorism significance. It is caused by a heat-labile polypeptide exotoxin produced by Clostridium botulinum, recognized as the most potent toxin known. The toxin irreversibly inhibits acetylcholine release at presynaptic cholinergic nerve terminals, resulting in flaccid paralysis. Neurologic recovery depends on axonal sprouting and formation of new synapses, accounting for the prolonged and often incomplete recovery. Symptom onset typically occurs within 12–72 hours but may be delayed up to one week, and death may occur within 24 hours of symptom onset. Mortality approaches 60–70% without treatment and decreases to 3–10% with aggressive supportive care. The principal clinical forms include food-borne, wound, and infantile botulism, with toxin absorption occurring through mucosal surfaces or nonintact skin.
Food-borne botulism results from ingestion of preformed toxin, most commonly associated with improperly canned or stored foods. Conditions required include contamination with spores, anaerobic conditions allowing germination, sufficient time for toxin production, inadequate heating, and ingestion by a susceptible host. Wound botulism presents after traumatic contamination of wounds, often without GI symptoms, and is frequently associated with intravenous drug use. Adult intestinal toxemia botulism occurs in individuals with altered gut flora due to structural abnormalities, immunocompromise, or prolonged antibiotic exposure and may recur. Inhalational botulism is rare but poses a significant bioterrorism risk. Iatrogenic botulism from cosmetic or therapeutic use is exceedingly uncommon.
Pediatric Considerations
Infantile botulism accounts for 50–76% of reported cases, with 90% occurring in infants younger than six months. It follows ingestion of C. botulinum spores that germinate within the immature gut, often associated with soil or dust exposure and weaning from breast milk. Presentation begins with constipation, followed by bulbar weakness and progressive descending flaccid paralysis. Honey is a known source of spores and should not be given to children under one year of age.
Etiology And Pathophysiology
Clostridium botulinum is a large, spore-forming, obligate anaerobic gram-positive bacillus ubiquitous in the environment. Seven antigenically distinct toxins (A–G) exist, with types A, B, E, and rarely F responsible for most human disease.
Clinical Features
Diagnosis is primarily clinical. Patients with classic food-borne botulism present with early bulbar palsies, including diplopia, dysphagia, dysarthria, and dysphonia, followed by symmetric descending paralysis. Sensation remains intact, and mentation is preserved. Progressive respiratory muscle weakness leads to ventilatory failure. Autonomic dysfunction is common and includes dry mouth, blurred vision, orthostatic hypotension, constipation, and urinary retention. Fever is typically absent. Wound botulism may be associated with fever. Infantile botulism presents with constipation, poor feeding, hypotonia, weak cry, lethargy, and respiratory compromise. Inhalational botulism mirrors food-borne disease but lacks gastrointestinal symptoms.
Evaluation And Diagnostic Testing
The diagnosis should prompt immediate notification of state health authorities or the CDC. Laboratory evaluation includes CBC, electrolytes, renal function, glucose, and arterial blood gas analysis to assess respiratory compromise. Confirmatory testing is performed via mouse bioassay on blood, stool, gastric contents, or suspected food sources, with results available in 6–96 hours. CSF analysis is normal, aiding distinction from Guillain–Barré syndrome. Neuroimaging is typically normal. Electrophysiologic studies show normal nerve conduction with reduced evoked muscle action potentials.
Differential Diagnosis
Consider myasthenia gravis, Lambert–Eaton syndrome, Guillain–Barré syndrome, tick paralysis, hypokalemic periodic paralysis, magnesium intoxication, diphtheritic neuropathy, poliomyelitis, and rare basilar stroke syndromes. In infants, sepsis, dehydration, metabolic disorders, and spinal muscular atrophy must be excluded.
Management Principles
Respiratory failure is the leading cause of death, making early airway protection and mechanical ventilation the cornerstone of management. Antitoxin therapy must be administered immediately once botulism is suspected, without waiting for laboratory confirmation. Wound botulism requires surgical débridement. Antibiotics are not effective for intestinal botulism and may worsen symptoms by increasing toxin release but may be used for secondary wound infections. Standard precautions are sufficient, as person-to-person transmission does not occur.
Pharmacologic Therapy
Infant botulism is treated with human-derived botulism immune globulin (BabyBIG®), which significantly reduces hospital stay. Adults require heptavalent botulinum antitoxin obtained through the CDC under emergency use protocols. Antibiotics are reserved for secondary infections. Vaccination with toxoid is limited to laboratory personnel.
Disposition And Follow-Up
All suspected cases require admission, with ICU care for any respiratory compromise. Discharge is appropriate only after prolonged, progressive neurologic recovery. Long-term follow-up often includes rehabilitation for persistent weakness, which may last up to one year, and psychological support for patients and families.
Clinical Insights And Common Errors
Botulism represents a public health emergency requiring rapid coordination with health authorities. Outbreaks involving multiple patients should heighten suspicion, as few alternative diagnoses present in clusters. Antitoxin halts disease progression but does not reverse established paralysis, emphasizing the importance of early administration before overt respiratory failure develops. Bulbar weakness may be misinterpreted as altered mental status, delaying diagnosis, and early respiratory insufficiency may be clinically subtle.
Overview And Definitions
Botulism is a rare but highly lethal neuroparalytic illness in the United States, with fewer than 200 cases annually, yet it carries major bioterrorism significance. It is caused by a heat-labile polypeptide exotoxin produced by Clostridium botulinum, recognized as the most potent toxin known. The toxin irreversibly inhibits acetylcholine release at presynaptic cholinergic nerve terminals, resulting in flaccid paralysis. Neurologic recovery depends on axonal sprouting and formation of new synapses, accounting for the prolonged and often incomplete recovery. Symptom onset typically occurs within 12–72 hours but may be delayed up to one week, and death may occur within 24 hours of symptom onset. Mortality approaches 60–70% without treatment and decreases to 3–10% with aggressive supportive care. The principal clinical forms include food-borne, wound, and infantile botulism, with toxin absorption occurring through mucosal surfaces or nonintact skin.
Food-borne botulism results from ingestion of preformed toxin, most commonly associated with improperly canned or stored foods. Conditions required include contamination with spores, anaerobic conditions allowing germination, sufficient time for toxin production, inadequate heating, and ingestion by a susceptible host. Wound botulism presents after traumatic contamination of wounds, often without GI symptoms, and is frequently associated with intravenous drug use. Adult intestinal toxemia botulism occurs in individuals with altered gut flora due to structural abnormalities, immunocompromise, or prolonged antibiotic exposure and may recur. Inhalational botulism is rare but poses a significant bioterrorism risk. Iatrogenic botulism from cosmetic or therapeutic use is exceedingly uncommon.
Pediatric Considerations
Infantile botulism accounts for 50–76% of reported cases, with 90% occurring in infants younger than six months. It follows ingestion of C. botulinum spores that germinate within the immature gut, often associated with soil or dust exposure and weaning from breast milk. Presentation begins with constipation, followed by bulbar weakness and progressive descending flaccid paralysis. Honey is a known source of spores and should not be given to children under one year of age.
Etiology And Pathophysiology
Clostridium botulinum is a large, spore-forming, obligate anaerobic gram-positive bacillus ubiquitous in the environment. Seven antigenically distinct toxins (A–G) exist, with types A, B, E, and rarely F responsible for most human disease.
Clinical Features
Diagnosis is primarily clinical. Patients with classic food-borne botulism present with early bulbar palsies, including diplopia, dysphagia, dysarthria, and dysphonia, followed by symmetric descending paralysis. Sensation remains intact, and mentation is preserved. Progressive respiratory muscle weakness leads to ventilatory failure. Autonomic dysfunction is common and includes dry mouth, blurred vision, orthostatic hypotension, constipation, and urinary retention. Fever is typically absent. Wound botulism may be associated with fever. Infantile botulism presents with constipation, poor feeding, hypotonia, weak cry, lethargy, and respiratory compromise. Inhalational botulism mirrors food-borne disease but lacks gastrointestinal symptoms.
Evaluation And Diagnostic Testing
The diagnosis should prompt immediate notification of state health authorities or the CDC. Laboratory evaluation includes CBC, electrolytes, renal function, glucose, and arterial blood gas analysis to assess respiratory compromise. Confirmatory testing is performed via mouse bioassay on blood, stool, gastric contents, or suspected food sources, with results available in 6–96 hours. CSF analysis is normal, aiding distinction from Guillain–Barré syndrome. Neuroimaging is typically normal. Electrophysiologic studies show normal nerve conduction with reduced evoked muscle action potentials.
Differential Diagnosis
Consider myasthenia gravis, Lambert–Eaton syndrome, Guillain–Barré syndrome, tick paralysis, hypokalemic periodic paralysis, magnesium intoxication, diphtheritic neuropathy, poliomyelitis, and rare basilar stroke syndromes. In infants, sepsis, dehydration, metabolic disorders, and spinal muscular atrophy must be excluded.
Management Principles
Respiratory failure is the leading cause of death, making early airway protection and mechanical ventilation the cornerstone of management. Antitoxin therapy must be administered immediately once botulism is suspected, without waiting for laboratory confirmation. Wound botulism requires surgical débridement. Antibiotics are not effective for intestinal botulism and may worsen symptoms by increasing toxin release but may be used for secondary wound infections. Standard precautions are sufficient, as person-to-person transmission does not occur.
Pharmacologic Therapy
Infant botulism is treated with human-derived botulism immune globulin (BabyBIG®), which significantly reduces hospital stay. Adults require heptavalent botulinum antitoxin obtained through the CDC under emergency use protocols. Antibiotics are reserved for secondary infections. Vaccination with toxoid is limited to laboratory personnel.
Disposition And Follow-Up
All suspected cases require admission, with ICU care for any respiratory compromise. Discharge is appropriate only after prolonged, progressive neurologic recovery. Long-term follow-up often includes rehabilitation for persistent weakness, which may last up to one year, and psychological support for patients and families.
Clinical Insights And Common Errors
Botulism represents a public health emergency requiring rapid coordination with health authorities. Outbreaks involving multiple patients should heighten suspicion, as few alternative diagnoses present in clusters. Antitoxin halts disease progression but does not reverse established paralysis, emphasizing the importance of early administration before overt respiratory failure develops. Bulbar weakness may be misinterpreted as altered mental status, delaying diagnosis, and early respiratory insufficiency may be clinically subtle.
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Emergency and Acute Medicine – Blow-Out Fracture
Overview and Definitions
A blow-out fracture is an orbital floor fracture without orbital rim involvement. It follows sudden blunt trauma to the globe—classically from a projectile larger than half the size of a fist—with force transmitted through the noncompressible globe to the weakest point: the orbital floor. Because the orbital floor forms the roof of the maxillary and ethmoid sinuses, fracture can create communication between these spaces, causing orbital emphysema. The orbit contains fat that stabilizes the globe; fracture may allow herniation of orbital fat into the maxillary/ethmoid sinuses, producing enophthalmos from increased orbital volume and sinus congestion, with possible fluid collection from edema/bleeding. The infraorbital nerve runs in a bony canal ~3 mm below the floor; injury can cause hypoesthesia of the ipsilateral cheek and upper lip. To differentiate swelling-related numbness from nerve injury, test sensation on the ipsilateral gingiva (infraorbital distribution). The inferior rectus and inferior oblique course along the floor; restriction may occur from entrapment, contusion, or cranial nerve dysfunction—typically diplopia on upward gaze and impaired elevation on exam. The medial rectus lies above the ethmoid sinus and is less often entrapped; when involved, it causes diplopia on ipsilateral lateral gaze.
Etiology
Occurs when a projectile strikes the globe and the transmitted force fractures the orbital floor. Common projectiles include paintball, handball, racquetball, baseball, rock, or possibly a fist (larger projectiles may be blocked by the orbital rim). Blow-out fractures are also seen after MVCs, the most common cause of maxillofacial trauma.
Pediatric Considerations
Children more often have orbital roof fractures with associated CNS injuries. Orbital floor fractures are unlikely before age 7 because the floor is less weak prior to sinus pneumatization. However, children can sustain fractures with unrecognized rectus entrapment—the “white-eyed” fracture—often presenting with nausea, vomiting, headache, and irritability that mimic head injury and distract from the ocular diagnosis.
Clinical Features
Typical findings include periorbital tenderness, swelling, and ecchymosis. Ocular motility issues include restricted upward gaze (inferior rectus entrapment) and restricted ipsilateral lateral gaze (medial rectus entrapment). Infraorbital hypoesthesia may extend to the upper lip. Enophthalmos may be present from fat displacement. Periorbital emphysema can occur from sinus communication. Epistaxis is possible. Visual acuity is typically normal; decreased acuity suggests more extensive injury. There is no orbital rim step-off (by definition).
Associated Severe Injuries and Complications
Ocular injuries may include ruptured globe (up to 30%; ophthalmologic emergency), retrobulbar hemorrhage, and emphysematous optic nerve compression. Cervical spine and intracranial injuries may coexist. Common associated ocular findings: subconjunctival hemorrhage, corneal abrasion/laceration, hyphema, traumatic mydriasis, traumatic iridocyclitis (uveitis). Less common: iridodialysis, retinal detachment, vitreous hemorrhage, optic nerve injury. Associated fractures include nasal bone, zygomatic arch, and Le Fort fractures. Late complications include sinusitis, orbital infection, permanent extraocular movement restriction, and enophthalmos.
History and Physical Examination
History often includes being struck in the eye by a projectile. Perform a thorough ophthalmologic exam and palpate orbital bones for step-off, but avoid pressure on the globe until rupture is excluded. Desmarres lid retractors may be needed with significant lid swelling. Document pupillary responses and visual acuity (use handheld methods; Rosenbaum card is useful). Assess extraocular movements for disconjugate gaze/diplopia. Test sensation in the infraorbital nerve distribution (including ipsilateral gingiva). Examine lids/adnexa for emphysema. Perform slit-lamp and fundoscopic exams for associated injuries. Complete a full exam for other injuries and neurologic impairment.
Diagnostic Testing and Imaging
Labs: pre-op labs if indicated; pregnancy test prior to radiography when appropriate.
Imaging: If CT is unavailable/contraindicated, plain radiographs can help: facial films, Waters view and exaggerated Waters—classic “teardrop sign” (herniated orbital contents into ipsilateral maxillary sinus), maxillary sinus opacification/air–fluid level (less specific), visible floor fracture, and orbital lucency consistent with emphysema. CT is preferred to define anatomy; obtain axial and coronal 1.5-mm cuts. True coronal acquisition is preferred, but reconstructed coronals are acceptable if positioning is not possible.
Procedure: Forced duction test helps distinguish entrapment from nerve dysfunction—apply topical anesthesia to the conjunctiva on the opposite side and pull the globe away from the suspected entrapment; restricted mobility = positive, indicating physical entrapment.
Pediatrics: Orbital CT is the study of choice; plain films are less helpful. Early identification of entrapment is critical because delayed diagnosis worsens long-term outcomes; early surgical intervention can significantly improve results.
Differential Diagnosis
Cranial nerve palsy, orbital cellulitis, periorbital cellulitis, periorbital contusion/ecchymosis, retrobulbar hemorrhage, ruptured globe.
Management
Prehospital: If globe injury is possible, place a metal protective eye shield and keep patient supine.
Initial stabilization: Evaluate for intracranial/cervical spine injuries, rule out ruptured globe, and check visual acuity (decrease suggests more extensive injury).
ED care (after globe rupture excluded): Apply cool compresses for 24–48 hr to reduce swelling and potentially minimize/reverse herniation and avoid surgery. Instruct to avoid Valsalva and nose blowing to prevent compressive orbital emphysema. Provide prophylactic antibiotics, nasal decongestants if not contraindicated, analgesia, and tetanus prophylaxis.
Medications
Prophylactic antibiotics (to reduce risk of sinusitis/orbital cellulitis): Cephalexin 250 mg q6h for 10 days.
Systemic corticosteroids (advocated by some to hasten edema resorption and better assess entrapment/orbital damage): Prednisone 60–80 mg/day, start within 48 hr, continue 5 days.
Nasal decongestant: Phenylephrine nasal spray BID for 2–4 days (if not contraindicated).
Disposition and Follow-Up
Admission is rare; ~85% resolve without surgery. Consult facial trauma in the ED and consider admission/urgent management if: ≥50% floor fracture, diplopia or entrapment (especially in children), or enophthalmos >2 mm. Most patients can be observed 10–14 days until swelling resolves, then follow up with facial trauma surgeon to decide on surgical repair.
Follow-Up Advice
Symptoms should gradually improve. Return to the ED for increasing swelling, tenderness, redness, or pain, and for any visual disturbance, vision loss, or increasing eye pain.
Clinical Insights and Common Errors
Be extremely vigilant with pupillary responses and visual acuity—abnormalities may be the earliest sign of serious complications such as globe rupture or optic nerve injury from emphysematous/retrobulbar compression. Carefully assess for muscle entrapment in all patients, especially children, to avoid missing white-eyed fractures and long-term sequelae. Watch for the oculocardiac (Aschner) reflex—bradycardia triggered by extraocular muscle traction or globe compression—more common in children; treat by removing the stimulus, and atropine may be required in some cases.
Overview and Definitions
A blow-out fracture is an orbital floor fracture without orbital rim involvement. It follows sudden blunt trauma to the globe—classically from a projectile larger than half the size of a fist—with force transmitted through the noncompressible globe to the weakest point: the orbital floor. Because the orbital floor forms the roof of the maxillary and ethmoid sinuses, fracture can create communication between these spaces, causing orbital emphysema. The orbit contains fat that stabilizes the globe; fracture may allow herniation of orbital fat into the maxillary/ethmoid sinuses, producing enophthalmos from increased orbital volume and sinus congestion, with possible fluid collection from edema/bleeding. The infraorbital nerve runs in a bony canal ~3 mm below the floor; injury can cause hypoesthesia of the ipsilateral cheek and upper lip. To differentiate swelling-related numbness from nerve injury, test sensation on the ipsilateral gingiva (infraorbital distribution). The inferior rectus and inferior oblique course along the floor; restriction may occur from entrapment, contusion, or cranial nerve dysfunction—typically diplopia on upward gaze and impaired elevation on exam. The medial rectus lies above the ethmoid sinus and is less often entrapped; when involved, it causes diplopia on ipsilateral lateral gaze.
Etiology
Occurs when a projectile strikes the globe and the transmitted force fractures the orbital floor. Common projectiles include paintball, handball, racquetball, baseball, rock, or possibly a fist (larger projectiles may be blocked by the orbital rim). Blow-out fractures are also seen after MVCs, the most common cause of maxillofacial trauma.
Pediatric Considerations
Children more often have orbital roof fractures with associated CNS injuries. Orbital floor fractures are unlikely before age 7 because the floor is less weak prior to sinus pneumatization. However, children can sustain fractures with unrecognized rectus entrapment—the “white-eyed” fracture—often presenting with nausea, vomiting, headache, and irritability that mimic head injury and distract from the ocular diagnosis.
Clinical Features
Typical findings include periorbital tenderness, swelling, and ecchymosis. Ocular motility issues include restricted upward gaze (inferior rectus entrapment) and restricted ipsilateral lateral gaze (medial rectus entrapment). Infraorbital hypoesthesia may extend to the upper lip. Enophthalmos may be present from fat displacement. Periorbital emphysema can occur from sinus communication. Epistaxis is possible. Visual acuity is typically normal; decreased acuity suggests more extensive injury. There is no orbital rim step-off (by definition).
Associated Severe Injuries and Complications
Ocular injuries may include ruptured globe (up to 30%; ophthalmologic emergency), retrobulbar hemorrhage, and emphysematous optic nerve compression. Cervical spine and intracranial injuries may coexist. Common associated ocular findings: subconjunctival hemorrhage, corneal abrasion/laceration, hyphema, traumatic mydriasis, traumatic iridocyclitis (uveitis). Less common: iridodialysis, retinal detachment, vitreous hemorrhage, optic nerve injury. Associated fractures include nasal bone, zygomatic arch, and Le Fort fractures. Late complications include sinusitis, orbital infection, permanent extraocular movement restriction, and enophthalmos.
History and Physical Examination
History often includes being struck in the eye by a projectile. Perform a thorough ophthalmologic exam and palpate orbital bones for step-off, but avoid pressure on the globe until rupture is excluded. Desmarres lid retractors may be needed with significant lid swelling. Document pupillary responses and visual acuity (use handheld methods; Rosenbaum card is useful). Assess extraocular movements for disconjugate gaze/diplopia. Test sensation in the infraorbital nerve distribution (including ipsilateral gingiva). Examine lids/adnexa for emphysema. Perform slit-lamp and fundoscopic exams for associated injuries. Complete a full exam for other injuries and neurologic impairment.
Diagnostic Testing and Imaging
Labs: pre-op labs if indicated; pregnancy test prior to radiography when appropriate.
Imaging: If CT is unavailable/contraindicated, plain radiographs can help: facial films, Waters view and exaggerated Waters—classic “teardrop sign” (herniated orbital contents into ipsilateral maxillary sinus), maxillary sinus opacification/air–fluid level (less specific), visible floor fracture, and orbital lucency consistent with emphysema. CT is preferred to define anatomy; obtain axial and coronal 1.5-mm cuts. True coronal acquisition is preferred, but reconstructed coronals are acceptable if positioning is not possible.
Procedure: Forced duction test helps distinguish entrapment from nerve dysfunction—apply topical anesthesia to the conjunctiva on the opposite side and pull the globe away from the suspected entrapment; restricted mobility = positive, indicating physical entrapment.
Pediatrics: Orbital CT is the study of choice; plain films are less helpful. Early identification of entrapment is critical because delayed diagnosis worsens long-term outcomes; early surgical intervention can significantly improve results.
Differential Diagnosis
Cranial nerve palsy, orbital cellulitis, periorbital cellulitis, periorbital contusion/ecchymosis, retrobulbar hemorrhage, ruptured globe.
Management
Prehospital: If globe injury is possible, place a metal protective eye shield and keep patient supine.
Initial stabilization: Evaluate for intracranial/cervical spine injuries, rule out ruptured globe, and check visual acuity (decrease suggests more extensive injury).
ED care (after globe rupture excluded): Apply cool compresses for 24–48 hr to reduce swelling and potentially minimize/reverse herniation and avoid surgery. Instruct to avoid Valsalva and nose blowing to prevent compressive orbital emphysema. Provide prophylactic antibiotics, nasal decongestants if not contraindicated, analgesia, and tetanus prophylaxis.
Medications
Prophylactic antibiotics (to reduce risk of sinusitis/orbital cellulitis): Cephalexin 250 mg q6h for 10 days.
Systemic corticosteroids (advocated by some to hasten edema resorption and better assess entrapment/orbital damage): Prednisone 60–80 mg/day, start within 48 hr, continue 5 days.
Nasal decongestant: Phenylephrine nasal spray BID for 2–4 days (if not contraindicated).
Disposition and Follow-Up
Admission is rare; ~85% resolve without surgery. Consult facial trauma in the ED and consider admission/urgent management if: ≥50% floor fracture, diplopia or entrapment (especially in children), or enophthalmos >2 mm. Most patients can be observed 10–14 days until swelling resolves, then follow up with facial trauma surgeon to decide on surgical repair.
Follow-Up Advice
Symptoms should gradually improve. Return to the ED for increasing swelling, tenderness, redness, or pain, and for any visual disturbance, vision loss, or increasing eye pain.
Clinical Insights and Common Errors
Be extremely vigilant with pupillary responses and visual acuity—abnormalities may be the earliest sign of serious complications such as globe rupture or optic nerve injury from emphysematous/retrobulbar compression. Carefully assess for muscle entrapment in all patients, especially children, to avoid missing white-eyed fractures and long-term sequelae. Watch for the oculocardiac (Aschner) reflex—bradycardia triggered by extraocular muscle traction or globe compression—more common in children; treat by removing the stimulus, and atropine may be required in some cases.
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Emergency and Acute Medicine – Burns
Overview And Definitions
Burns are acute injuries to skin and underlying tissues resulting from thermal, chemical, electrical, radiation, or mechanical energy transfer. Severity is determined by burn depth, total body surface area (TBSA) involved, anatomic location, and associated inhalation or systemic injury.
Etiology And Mechanisms
Burns are broadly classified into seven categories. Scald injuries result from hot liquids, grease, or steam. Contact burns arise from exposure to hot or cold surfaces. Thermal burns are caused by fire or open flames. Radiation burns occur from ionizing or nonionizing exposure. Chemical burns result from acids, alkalis, or other corrosive substances. Electrical burns occur from low- or high-voltage exposure and may cause deep tissue injury with minimal skin findings. Friction burns include road rash and rope burns.
Clinical Presentation And Associated Findings
Most burns demonstrate visible skin injury. Inhalation injury should be suspected with facial burns, pharyngeal erythema, singed nasal hair or eyelashes, carbonaceous sputum, and changes in respiratory mechanics such as wheezing, coughing, or tachypnea. Electrical and chemical burns may appear deceptively minor externally, sometimes showing only entry or exit wounds.
History should include an AMPLE assessment, burn source and environment, possibility of explosion, medical history, medications, allergies, and tetanus status. Carbon monoxide poisoning is the most common cause of death in fires and renders pulse oximetry unreliable. Cyanide poisoning should be considered when synthetic materials such as wool, nylon, silk, or polyurethane are involved.
Physical examination prioritizes airway assessment, followed by a full trauma survey. Evaluate the face, oropharynx, and nares for inhalation injury, assess the cervical spine when mechanism is concerning, examine the eyes for corneal burns, and estimate burn depth and surface area. In children, specific burn patterns may raise concern for nonaccidental injury.
Assessment Of Burn Severity
Burn size is expressed as a percentage of TBSA. In adults, the rule of nines estimates surface area: head and neck 9%, each arm 9%, each leg 18%, anterior trunk 18%, posterior trunk 18%, and perineum or palm 1%. In infants and children, the head accounts for a larger percentage and the legs for less.
The Lund and Browder chart provides age-adjusted estimates and is more accurate. The palm method, where the patient’s palm and fingers equal approximately 1% TBSA, is useful for scattered burns.
Depth classification includes superficial (first-degree) burns involving only the epidermis with erythema and pain, healing without scarring. Partial-thickness (second-degree) burns involve the dermis and may be superficial or deep. Superficial partial-thickness burns are pink, moist, painful, and heal within weeks with minimal scarring. Deep partial-thickness burns have pale dermis, reduced sensation, and often result in scarring or contractures. Full-thickness (third-degree) burns extend through the dermis, producing leathery, insensate skin and requiring surgical management. Fourth-degree burns involve deeper structures such as fascia, muscle, or bone and cause significant disability.
Diagnostic Evaluation
Severe burns require laboratory evaluation including CBC, electrolytes, renal function, glucose, coagulation studies, type and crossmatch, and pregnancy testing when appropriate. Arterial blood gas with carboxyhemoglobin level is indicated for suspected inhalation injury. Cyanide levels may be obtained selectively. Imaging may include chest radiography. Bronchoscopy is useful to evaluate inhalation injury, and ECG monitoring is important in electrical burns and in older patients.
Prehospital And Initial Management
Immediate care focuses on stopping the burning process, removing contaminated clothing or jewelry, keeping the patient warm, and cooling burned areas when appropriate. Airway protection with early oxygen administration is essential, with prompt intubation for respiratory compromise. Early IV access and fluid resuscitation are critical in burns exceeding 20% TBSA. Adequate analgesia should be provided, wounds covered with clean materials, and patients transported promptly to a burn center when indicated.
Emergency Department Management
Airway control remains the top priority, with early intubation for upper airway involvement or circumferential neck burns. Provide supplemental oxygen, IV access, continuous monitoring, analgesia, and assessment for associated injuries.
Fluid resuscitation for partial- and full-thickness burns greater than 20% TBSA is guided by the Parkland formula in adults: 4 mL/kg/%TBSA using lactated Ringer solution, with half administered in the first 8 hours and the remainder over the next 16 hours. Urine output goals are 0.5 mL/kg/hr in adults and 1 mL/kg/hr in children.
Escharotomy is indicated for circumferential burns causing vascular or respiratory compromise. Wound care includes topical antibiotics, nonadherent dressings, and avoidance of prophylactic systemic antibiotics. Transfer to a burn center should not be delayed for wound care. Minor burns may be managed as outpatients with careful cleansing, blister management, topical therapy, and daily dressing changes.
Special Populations
Children require modified fluid resuscitation, with the Galveston formula providing more accurate estimates. They are at higher risk of hypothermia and hypoglycemia and require close monitoring. Nonaccidental trauma must be considered.
In pregnancy, maternal and fetal risks are significant, fluid needs may be higher, and early obstetric consultation and fetal monitoring are recommended.
Disposition And Follow-Up
Admission is required for moderate to severe burns, suspected abuse, inability to manage wounds, or need for specialized care. Burn center referral is indicated for extensive burns, involvement of critical areas, electrical or chemical burns, inhalation injury, or significant comorbidities.
Patients with minor, noncritical burns may be discharged if reliable, with close follow-up arranged within 1–2 days to reassess wound status, pain control, and infection.
Clinical Insights And Common Errors
Early airway protection and aggressive fluid resuscitation are critical determinants of outcome. Delayed recognition of inhalation injury can be fatal. Adequate pain control should never be deferred. Children require vigilant monitoring for hypoglycemia and hypothermia, and fluid needs must be reassessed frequently.
Overview And Definitions
Burns are acute injuries to skin and underlying tissues resulting from thermal, chemical, electrical, radiation, or mechanical energy transfer. Severity is determined by burn depth, total body surface area (TBSA) involved, anatomic location, and associated inhalation or systemic injury.
Etiology And Mechanisms
Burns are broadly classified into seven categories. Scald injuries result from hot liquids, grease, or steam. Contact burns arise from exposure to hot or cold surfaces. Thermal burns are caused by fire or open flames. Radiation burns occur from ionizing or nonionizing exposure. Chemical burns result from acids, alkalis, or other corrosive substances. Electrical burns occur from low- or high-voltage exposure and may cause deep tissue injury with minimal skin findings. Friction burns include road rash and rope burns.
Clinical Presentation And Associated Findings
Most burns demonstrate visible skin injury. Inhalation injury should be suspected with facial burns, pharyngeal erythema, singed nasal hair or eyelashes, carbonaceous sputum, and changes in respiratory mechanics such as wheezing, coughing, or tachypnea. Electrical and chemical burns may appear deceptively minor externally, sometimes showing only entry or exit wounds.
History should include an AMPLE assessment, burn source and environment, possibility of explosion, medical history, medications, allergies, and tetanus status. Carbon monoxide poisoning is the most common cause of death in fires and renders pulse oximetry unreliable. Cyanide poisoning should be considered when synthetic materials such as wool, nylon, silk, or polyurethane are involved.
Physical examination prioritizes airway assessment, followed by a full trauma survey. Evaluate the face, oropharynx, and nares for inhalation injury, assess the cervical spine when mechanism is concerning, examine the eyes for corneal burns, and estimate burn depth and surface area. In children, specific burn patterns may raise concern for nonaccidental injury.
Assessment Of Burn Severity
Burn size is expressed as a percentage of TBSA. In adults, the rule of nines estimates surface area: head and neck 9%, each arm 9%, each leg 18%, anterior trunk 18%, posterior trunk 18%, and perineum or palm 1%. In infants and children, the head accounts for a larger percentage and the legs for less.
The Lund and Browder chart provides age-adjusted estimates and is more accurate. The palm method, where the patient’s palm and fingers equal approximately 1% TBSA, is useful for scattered burns.
Depth classification includes superficial (first-degree) burns involving only the epidermis with erythema and pain, healing without scarring. Partial-thickness (second-degree) burns involve the dermis and may be superficial or deep. Superficial partial-thickness burns are pink, moist, painful, and heal within weeks with minimal scarring. Deep partial-thickness burns have pale dermis, reduced sensation, and often result in scarring or contractures. Full-thickness (third-degree) burns extend through the dermis, producing leathery, insensate skin and requiring surgical management. Fourth-degree burns involve deeper structures such as fascia, muscle, or bone and cause significant disability.
Diagnostic Evaluation
Severe burns require laboratory evaluation including CBC, electrolytes, renal function, glucose, coagulation studies, type and crossmatch, and pregnancy testing when appropriate. Arterial blood gas with carboxyhemoglobin level is indicated for suspected inhalation injury. Cyanide levels may be obtained selectively. Imaging may include chest radiography. Bronchoscopy is useful to evaluate inhalation injury, and ECG monitoring is important in electrical burns and in older patients.
Prehospital And Initial Management
Immediate care focuses on stopping the burning process, removing contaminated clothing or jewelry, keeping the patient warm, and cooling burned areas when appropriate. Airway protection with early oxygen administration is essential, with prompt intubation for respiratory compromise. Early IV access and fluid resuscitation are critical in burns exceeding 20% TBSA. Adequate analgesia should be provided, wounds covered with clean materials, and patients transported promptly to a burn center when indicated.
Emergency Department Management
Airway control remains the top priority, with early intubation for upper airway involvement or circumferential neck burns. Provide supplemental oxygen, IV access, continuous monitoring, analgesia, and assessment for associated injuries.
Fluid resuscitation for partial- and full-thickness burns greater than 20% TBSA is guided by the Parkland formula in adults: 4 mL/kg/%TBSA using lactated Ringer solution, with half administered in the first 8 hours and the remainder over the next 16 hours. Urine output goals are 0.5 mL/kg/hr in adults and 1 mL/kg/hr in children.
Escharotomy is indicated for circumferential burns causing vascular or respiratory compromise. Wound care includes topical antibiotics, nonadherent dressings, and avoidance of prophylactic systemic antibiotics. Transfer to a burn center should not be delayed for wound care. Minor burns may be managed as outpatients with careful cleansing, blister management, topical therapy, and daily dressing changes.
Special Populations
Children require modified fluid resuscitation, with the Galveston formula providing more accurate estimates. They are at higher risk of hypothermia and hypoglycemia and require close monitoring. Nonaccidental trauma must be considered.
In pregnancy, maternal and fetal risks are significant, fluid needs may be higher, and early obstetric consultation and fetal monitoring are recommended.
Disposition And Follow-Up
Admission is required for moderate to severe burns, suspected abuse, inability to manage wounds, or need for specialized care. Burn center referral is indicated for extensive burns, involvement of critical areas, electrical or chemical burns, inhalation injury, or significant comorbidities.
Patients with minor, noncritical burns may be discharged if reliable, with close follow-up arranged within 1–2 days to reassess wound status, pain control, and infection.
Clinical Insights And Common Errors
Early airway protection and aggressive fluid resuscitation are critical determinants of outcome. Delayed recognition of inhalation injury can be fatal. Adequate pain control should never be deferred. Children require vigilant monitoring for hypoglycemia and hypothermia, and fluid needs must be reassessed frequently.
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Emergency and Acute Medicine – Brugada Syndrome
Overview And Definitions
Brugada syndrome is an inherited cardiac channelopathy caused by mutations in cardiac sodium (Na⁺) channels, occurring in the absence of structural heart disease. It carries a very high risk of sudden cardiac death, typically due to ventricular fibrillation. Two-year mortality approaches 30% without intervention. The condition accounts for 40–60% of cases previously labeled idiopathic ventricular fibrillation. It is more prevalent in men, particularly those of Southeast Asian descent, but can affect all ages, sexes, and races.
Etiology And Pathophysiology
Brugada syndrome is inherited in an autosomal dominant pattern in approximately 50% of cases, with variable penetrance. More than 70 sodium channel mutations have been identified, most involving the SCN5A gene, which accounts for roughly 20% of cases. The abnormal sodium current predisposes to malignant ventricular dysrhythmias, especially under triggering conditions such as fever, metabolic derangements, or drug exposure.
Clinical Presentation
Patients most commonly present with syncope, near-syncope, palpitations, or sudden cardiac arrest due to polymorphic ventricular tachycardia or ventricular fibrillation. Episodes often occur at rest or during sleep. A history may reveal nocturnal agonal respirations, fever-associated symptoms, cocaine use, or exposure to tricyclic antidepressants or psychotropic drugs. Family history is critical and may include unexplained drowning, early or sudden cardiac death, or known Brugada syndrome in relatives. Physical examination is usually normal but should focus on excluding alternative causes of syncope or dysrhythmia.
Diagnostic Evaluation
A 12-lead ECG is essential. Toxicology screening and careful history and family assessment are required. Laboratory studies should evaluate electrolytes, metabolic abnormalities, and ischemia when appropriate.
Electrocardiographic Findings
Diagnosis is based on characteristic ECG patterns in the right precordial leads (V1–V3), often with right bundle branch block or incomplete right bundle branch block morphology and ST-segment elevation.
Type 1 (coved pattern) shows ≥2 mm ST elevation with a downsloping, concave ST segment and a negative symmetric T wave, without QRS duration mismatch between V1 and V6.
Type 2 (saddleback pattern) shows an r′ ≥2 mm followed by convex ST elevation and a QRS duration mismatch between V1 and V6. ST elevation may be limited to V1 and rarely extends to V3.
Additional Testing
Laboratory testing includes serum chemistries, cardiac biomarkers if ischemia is suspected, CBC in syncope evaluation, and D-dimer when pulmonary embolism is considered. Chest radiography assesses cardiomegaly, and CT angiography is used selectively. Electrophysiology testing with sodium channel blocker challenge may unmask diagnostic ECG changes. Implantable cardioverter-defibrillator (ICD) placement dramatically reduces mortality.
Differential Diagnosis
Consider other causes of syncope and dysrhythmia, including vasovagal syncope, hypovolemia, pregnancy, atrial and ventricular tachyarrhythmias, Wolff–Parkinson–White syndrome, long QT syndromes, high-grade AV block, symptomatic bradycardia, and drug overdose (especially TCAs). ECG mimics include isolated RBBB, athletic heart changes, septal hypertrophy, pectus excavatum, arrhythmogenic right ventricular cardiomyopathy, STEMI, myocarditis, pericarditis, electrolyte disorders, and pulmonary embolism.
Management And Emergency Care
Initial management follows standard airway, breathing, and circulation principles, with full ACLS protocols for arrest or unstable dysrhythmias. Continuous cardiac monitoring is required. Cardiology consultation for electrophysiology evaluation is essential. Electrolyte and metabolic abnormalities should be corrected promptly. Antiarrhythmic medications are generally ineffective. Management of asymptomatic patients remains controversial, though EP evaluation is recommended.
Disposition And Follow-Up
Patients with concerning ECG findings, unexplained syncope, ongoing dysrhythmias, or inability to obtain urgent cardiology follow-up should be admitted. Discharge may be considered only if the patient is asymptomatic, hemodynamically stable, and cleared by cardiology, including appropriate ICD interrogation if present. All patients with suspected or confirmed Brugada syndrome require electrophysiology follow-up.
Key Clinical Insights And Diagnostic Traps
Maintain suspicion for Brugada syndrome in cases of unexplained syncope or sudden cardiac death, particularly with a relevant family history. The ECG pattern—RBBB or incomplete RBBB with ST elevation isolated to V1–V3—is central to diagnosis, but several mimics exist. Fever, systemic illness, or drugs may unmask the Brugada pattern. Early cardiology involvement is critical, as ICD implantation is the only proven therapy that nearly eliminates the risk of sudden cardiac death.
Overview And Definitions
Brugada syndrome is an inherited cardiac channelopathy caused by mutations in cardiac sodium (Na⁺) channels, occurring in the absence of structural heart disease. It carries a very high risk of sudden cardiac death, typically due to ventricular fibrillation. Two-year mortality approaches 30% without intervention. The condition accounts for 40–60% of cases previously labeled idiopathic ventricular fibrillation. It is more prevalent in men, particularly those of Southeast Asian descent, but can affect all ages, sexes, and races.
Etiology And Pathophysiology
Brugada syndrome is inherited in an autosomal dominant pattern in approximately 50% of cases, with variable penetrance. More than 70 sodium channel mutations have been identified, most involving the SCN5A gene, which accounts for roughly 20% of cases. The abnormal sodium current predisposes to malignant ventricular dysrhythmias, especially under triggering conditions such as fever, metabolic derangements, or drug exposure.
Clinical Presentation
Patients most commonly present with syncope, near-syncope, palpitations, or sudden cardiac arrest due to polymorphic ventricular tachycardia or ventricular fibrillation. Episodes often occur at rest or during sleep. A history may reveal nocturnal agonal respirations, fever-associated symptoms, cocaine use, or exposure to tricyclic antidepressants or psychotropic drugs. Family history is critical and may include unexplained drowning, early or sudden cardiac death, or known Brugada syndrome in relatives. Physical examination is usually normal but should focus on excluding alternative causes of syncope or dysrhythmia.
Diagnostic Evaluation
A 12-lead ECG is essential. Toxicology screening and careful history and family assessment are required. Laboratory studies should evaluate electrolytes, metabolic abnormalities, and ischemia when appropriate.
Electrocardiographic Findings
Diagnosis is based on characteristic ECG patterns in the right precordial leads (V1–V3), often with right bundle branch block or incomplete right bundle branch block morphology and ST-segment elevation.
Type 1 (coved pattern) shows ≥2 mm ST elevation with a downsloping, concave ST segment and a negative symmetric T wave, without QRS duration mismatch between V1 and V6.
Type 2 (saddleback pattern) shows an r′ ≥2 mm followed by convex ST elevation and a QRS duration mismatch between V1 and V6. ST elevation may be limited to V1 and rarely extends to V3.
Additional Testing
Laboratory testing includes serum chemistries, cardiac biomarkers if ischemia is suspected, CBC in syncope evaluation, and D-dimer when pulmonary embolism is considered. Chest radiography assesses cardiomegaly, and CT angiography is used selectively. Electrophysiology testing with sodium channel blocker challenge may unmask diagnostic ECG changes. Implantable cardioverter-defibrillator (ICD) placement dramatically reduces mortality.
Differential Diagnosis
Consider other causes of syncope and dysrhythmia, including vasovagal syncope, hypovolemia, pregnancy, atrial and ventricular tachyarrhythmias, Wolff–Parkinson–White syndrome, long QT syndromes, high-grade AV block, symptomatic bradycardia, and drug overdose (especially TCAs). ECG mimics include isolated RBBB, athletic heart changes, septal hypertrophy, pectus excavatum, arrhythmogenic right ventricular cardiomyopathy, STEMI, myocarditis, pericarditis, electrolyte disorders, and pulmonary embolism.
Management And Emergency Care
Initial management follows standard airway, breathing, and circulation principles, with full ACLS protocols for arrest or unstable dysrhythmias. Continuous cardiac monitoring is required. Cardiology consultation for electrophysiology evaluation is essential. Electrolyte and metabolic abnormalities should be corrected promptly. Antiarrhythmic medications are generally ineffective. Management of asymptomatic patients remains controversial, though EP evaluation is recommended.
Disposition And Follow-Up
Patients with concerning ECG findings, unexplained syncope, ongoing dysrhythmias, or inability to obtain urgent cardiology follow-up should be admitted. Discharge may be considered only if the patient is asymptomatic, hemodynamically stable, and cleared by cardiology, including appropriate ICD interrogation if present. All patients with suspected or confirmed Brugada syndrome require electrophysiology follow-up.
Key Clinical Insights And Diagnostic Traps
Maintain suspicion for Brugada syndrome in cases of unexplained syncope or sudden cardiac death, particularly with a relevant family history. The ECG pattern—RBBB or incomplete RBBB with ST elevation isolated to V1–V3—is central to diagnosis, but several mimics exist. Fever, systemic illness, or drugs may unmask the Brugada pattern. Early cardiology involvement is critical, as ICD implantation is the only proven therapy that nearly eliminates the risk of sudden cardiac death.
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Emergency and Acute Medicine – Bundle Branch Blocks
Overview And Definitions
Bundle branch blocks (BBBs) result from impaired intraventricular conduction through the right or left bundle branches. In complete BBB, conduction is absent or markedly delayed in one bundle while the other conducts normally, causing the affected ventricle to depolarize via slower muscle-to-muscle transmission. This produces a widened, disorganized QRS complex ≥120 msec.
Incomplete BBB represents delayed but not fully blocked conduction, with QRS duration between 100 and 120 msec.
Right bundle branch block (RBBB) reflects delayed right ventricular depolarization, whereas left bundle branch block (LBBB) reflects delayed left ventricular depolarization. LBBB may result from delay in the main left bundle or both left fascicles and leads to early right septal activation with loss of normal septal Q waves on ECG.
Anatomic And Conduction Considerations
The left bundle divides into two fascicles. The left anterior fascicle conducts impulses inferiorly, anteriorly, and to the right; its blockage alters frontal plane axis. The left posterior fascicle activates the midseptum and inferior–posterior walls; isolated block is rare.
Bifascicular block refers to RBBB combined with either left anterior or left posterior fascicular block.
Etiology And Pathophysiology
Common causes include myocardial infarction, cardiomyopathy, chronic hypertension, valvular heart disease, age-related fibrosis of the Purkinje system, and postoperative changes after cardiac surgery. Congenital heart disease such as atrial septal defect may be associated. Exercise-induced BBBs can occur.
Certain diseases and conditions are notable, including Brugada syndrome (typically presenting with RBBB pattern and associated with sudden cardiac death) and Chagas disease, particularly in Central and South America.
Medications may contribute, including β-blockers, calcium channel blockers, tricyclic antidepressants, class Ia and Ic antiarrhythmics, and digoxin.
Clinical Presentation
Many patients are asymptomatic. RBBB may be associated with a split S2 that persists with expiration, while LBBB produces a paradoxical or reversed split S2. When symptoms occur, they may include syncope or presyncope, chest pain, or manifestations related to the underlying cardiac disease.
Initial Evaluation And Essential Workup
A 12-lead ECG is central to diagnosis. Careful clinical assessment is required to identify ischemia, syncope, or associated dysrhythmias.
Electrocardiographic Features
RBBB shows a QRS duration ≥0.12 sec when complete and 0.10–0.12 sec when incomplete, with rsrʹ, rsRʹ, or rSRʹ (“M-shaped”) complexes in V1–V2 and a wide, deep S wave in V5–V6. Brugada syndrome presents with RBBB morphology plus ST-segment elevation in V1–V3.
LBBB is characterized by broad, slurred R waves in leads V5–V6, I, and aVL; small or absent R waves with deep S waves in V1–V2; and absence of normal septal Q waves in V5–V6 and I.
Left anterior fascicular block shows a QRS <120 msec with left-axis deviation (approximately −45° to −90°), deep s waves in ii, iii, and avf, qr complexes i avl.< />pan>
Left posterior fascicular block shows QRS <120 msec with right-axis deviation (≥120°), rs complexes in i and avl, qr ii, iii, avf, after excluding other causes of deviation.< />pan>
Diagnostic Testing
Laboratory testing may include electrolytes when metabolic disturbances are suspected and cardiac enzymes if ischemia is a concern. Chest radiography can reveal cardiomegaly or congestive heart failure. Electrophysiologic testing may be indicated in patients with unexplained syncope and structural heart disease as part of inpatient evaluation.
Differential Diagnosis
Consider ventricular tachycardia, myocardial infarction, ventricular hypertrophy, hyperkalemia, and drug-induced conduction abnormalities. In patients with LBBB, myocardial infarction assessment relies on criteria such as the Sgarbossa criteria, including concordant ST elevation or depression and excessive discordant ST elevation.
Management In The Emergency Setting
Isolated bundle branch block itself does not require specific therapy. Management focuses on treating associated conditions such as ischemia, heart failure, or syncope. Continuous monitoring is important, as BBBs can complicate rhythm interpretation and mimic ventricular tachycardia or ischemia.
Patients with symptomatic bifascicular block or high-grade atrioventricular block should have transcutaneous pacing pads applied, with sedation and analgesia as needed. Transvenous pacing is indicated for bifascicular block with type II second-degree or third-degree AV block, or for alternating LBBB and RBBB. New BBB with symptoms suggestive of myocardial infarction warrants urgent reperfusion therapy or catheterization.
Disposition And Follow-Up
Admission is required for patients with suspected myocardial ischemia, syncope, dysrhythmias, or BBB associated with high-grade AV block. Asymptomatic patients or those with incidental findings may be discharged with appropriate counseling. Referral to a cardiologist is recommended to evaluate for underlying cardiac disease.
Clinical Pearls And Pitfalls
New conduction abnormalities should always prompt consideration of myocardial ischemia. Specific ECG criteria help identify infarction in the presence of bundle branch block. Careful rhythm interpretation is essential to avoid misdiagnosing ventricular tachycardia or missing acute ischemia.
Overview And Definitions
Bundle branch blocks (BBBs) result from impaired intraventricular conduction through the right or left bundle branches. In complete BBB, conduction is absent or markedly delayed in one bundle while the other conducts normally, causing the affected ventricle to depolarize via slower muscle-to-muscle transmission. This produces a widened, disorganized QRS complex ≥120 msec.
Incomplete BBB represents delayed but not fully blocked conduction, with QRS duration between 100 and 120 msec.
Right bundle branch block (RBBB) reflects delayed right ventricular depolarization, whereas left bundle branch block (LBBB) reflects delayed left ventricular depolarization. LBBB may result from delay in the main left bundle or both left fascicles and leads to early right septal activation with loss of normal septal Q waves on ECG.
Anatomic And Conduction Considerations
The left bundle divides into two fascicles. The left anterior fascicle conducts impulses inferiorly, anteriorly, and to the right; its blockage alters frontal plane axis. The left posterior fascicle activates the midseptum and inferior–posterior walls; isolated block is rare.
Bifascicular block refers to RBBB combined with either left anterior or left posterior fascicular block.
Etiology And Pathophysiology
Common causes include myocardial infarction, cardiomyopathy, chronic hypertension, valvular heart disease, age-related fibrosis of the Purkinje system, and postoperative changes after cardiac surgery. Congenital heart disease such as atrial septal defect may be associated. Exercise-induced BBBs can occur.
Certain diseases and conditions are notable, including Brugada syndrome (typically presenting with RBBB pattern and associated with sudden cardiac death) and Chagas disease, particularly in Central and South America.
Medications may contribute, including β-blockers, calcium channel blockers, tricyclic antidepressants, class Ia and Ic antiarrhythmics, and digoxin.
Clinical Presentation
Many patients are asymptomatic. RBBB may be associated with a split S2 that persists with expiration, while LBBB produces a paradoxical or reversed split S2. When symptoms occur, they may include syncope or presyncope, chest pain, or manifestations related to the underlying cardiac disease.
Initial Evaluation And Essential Workup
A 12-lead ECG is central to diagnosis. Careful clinical assessment is required to identify ischemia, syncope, or associated dysrhythmias.
Electrocardiographic Features
RBBB shows a QRS duration ≥0.12 sec when complete and 0.10–0.12 sec when incomplete, with rsrʹ, rsRʹ, or rSRʹ (“M-shaped”) complexes in V1–V2 and a wide, deep S wave in V5–V6. Brugada syndrome presents with RBBB morphology plus ST-segment elevation in V1–V3.
LBBB is characterized by broad, slurred R waves in leads V5–V6, I, and aVL; small or absent R waves with deep S waves in V1–V2; and absence of normal septal Q waves in V5–V6 and I.
Left anterior fascicular block shows a QRS <120 msec with left-axis deviation (approximately −45° to −90°), deep s waves in ii, iii, and avf, qr complexes i avl.< />pan>
Left posterior fascicular block shows QRS <120 msec with right-axis deviation (≥120°), rs complexes in i and avl, qr ii, iii, avf, after excluding other causes of deviation.< />pan>
Diagnostic Testing
Laboratory testing may include electrolytes when metabolic disturbances are suspected and cardiac enzymes if ischemia is a concern. Chest radiography can reveal cardiomegaly or congestive heart failure. Electrophysiologic testing may be indicated in patients with unexplained syncope and structural heart disease as part of inpatient evaluation.
Differential Diagnosis
Consider ventricular tachycardia, myocardial infarction, ventricular hypertrophy, hyperkalemia, and drug-induced conduction abnormalities. In patients with LBBB, myocardial infarction assessment relies on criteria such as the Sgarbossa criteria, including concordant ST elevation or depression and excessive discordant ST elevation.
Management In The Emergency Setting
Isolated bundle branch block itself does not require specific therapy. Management focuses on treating associated conditions such as ischemia, heart failure, or syncope. Continuous monitoring is important, as BBBs can complicate rhythm interpretation and mimic ventricular tachycardia or ischemia.
Patients with symptomatic bifascicular block or high-grade atrioventricular block should have transcutaneous pacing pads applied, with sedation and analgesia as needed. Transvenous pacing is indicated for bifascicular block with type II second-degree or third-degree AV block, or for alternating LBBB and RBBB. New BBB with symptoms suggestive of myocardial infarction warrants urgent reperfusion therapy or catheterization.
Disposition And Follow-Up
Admission is required for patients with suspected myocardial ischemia, syncope, dysrhythmias, or BBB associated with high-grade AV block. Asymptomatic patients or those with incidental findings may be discharged with appropriate counseling. Referral to a cardiologist is recommended to evaluate for underlying cardiac disease.
Clinical Pearls And Pitfalls
New conduction abnormalities should always prompt consideration of myocardial ischemia. Specific ECG criteria help identify infarction in the presence of bundle branch block. Careful rhythm interpretation is essential to avoid misdiagnosing ventricular tachycardia or missing acute ischemia.
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Emergency and Acute Medicine – Boerhaave Syndrome
Overview and Definitions
Boerhaave syndrome refers to a spontaneous rupture of the esophagus caused by a sudden rise in intra-abdominal pressure combined with negative intrathoracic pressure. This results in a full-thickness, transmural longitudinal tear. The absence of a serosal layer in the esophagus makes it particularly vulnerable to perforation and rapid mediastinal contamination. Preexisting mucosal injury, such as esophagitis, further weakens the wall. Most ruptures occur along the left posterolateral aspect of the distal third of the esophagus. This condition carries very high morbidity and mortality, the highest among gastrointestinal perforations. Overall mortality approaches 20%, and delays beyond 24 hours may double mortality. Cervical perforations have the lowest mortality, followed by abdominal and thoracic ruptures.
Etiology
The most frequent precipitant is forceful vomiting or retching. Other associated triggers include heavy lifting, seizures, childbirth, blunt trauma, induced emesis, caustic ingestion, and laughing. Risk is increased in patients with Barrett ulcer, HIV/AIDS, pill esophagitis, and chronic alcohol use. The condition predominantly affects middle-aged men. Notably, iatrogenic causes account for over half of all esophageal perforations overall.
Pediatric note: Rare; reported in neonates. Always consider caustic ingestion.
Clinical Features
Symptoms are often nonspecific, contributing to diagnostic delay. The most common presentation is acute chest or epigastric pain following vomiting or retching.
Mackler triad—vomiting, chest pain, and subcutaneous emphysema—is classic but uncommon. Chest pain is typically retrosternal and pleuritic, radiates to the back or left shoulder, worsens with swallowing, and may be associated with odynophagia. Swallowing can provoke coughing. A history of heavy alcohol intake is frequently present.
Alert: Subtle or vague symptoms are common and worsen prognosis if diagnosis is delayed.
Physical Examination
Findings may include dyspnea, diaphoresis, tachypnea, fever, and shock in severe cases. Subcutaneous emphysema of the neck or chest wall and mediastinal crepitus (Hamman crunch) may be present. Pleural effusions, usually left-sided, are common. Untreated cases progress to mediastinitis and abscess formation. Hemorrhage is uncommon.
Essential Evaluation
Obtain upright chest radiographs (PA and lateral if tolerated) to assess for pneumomediastinum, subcutaneous emphysema, pleural effusion, pneumothorax, widened mediastinum, hydropneumothorax, empyema, free intraperitoneal air, and the Naclerio V sign.
A contrast esophagram is key to identifying the perforation and guiding management. Contrast choice remains debated: water-soluble agents are less irritating if leaked but less sensitive and dangerous if aspirated, while barium is more sensitive but more irritating to the mediastinum. If the initial study is negative and suspicion remains high, repeat imaging is warranted.
Diagnostic Tests and Interpretation
Laboratory studies include CBC, PT/PTT/INR, and blood cultures. Pleural fluid analysis may show low pH (<6), elevated amylase, and undigested food particles. ecg is useful to exclude cardiac causes.< />pan>
CT chest is sensitive for detecting mediastinal air, periesophageal fluid, and pleural involvement, though it does not localize the tear. Endoscopy is controversial due to risk of worsening the perforation.
Differential Diagnosis
Myocardial infarction, aortic dissection, pneumothorax, pneumonia, pulmonary embolism, pericarditis, pancreatitis, cholecystitis, intestinal obstruction, mesenteric ischemia, lung abscess, ruptured viscus, and benign spontaneous pneumomediastinum.
Management
Prehospital: Secure the airway if needed. Establish two large-bore IV lines and treat hypotension with 0.9% normal saline. Avoid opiates prior to ED arrival when possible.
Initial stabilization: Follow ABCs. Administer 100% oxygen or intubate if airway compromise is present. Give 20 mL/kg crystalloid bolus and initiate dopamine if hypotension persists. Consider central access for unstable patients.
ED care: Keep patient NPO, carefully place a nasogastric tube for decompression, insert a urinary catheter, expedite diagnostic evaluation, and obtain immediate surgical consultation. Definitive treatment is usually surgical repair; endoscopic stenting or conservative management may be considered in selected patients with contained perforations. Begin broad-spectrum IV antibiotics targeting oral and gastrointestinal flora.
Medications
Ampicillin/sulbactam 3 g IV q6h; Gentamicin 2 mg/kg loading dose then 1.7 mg/kg q8h or 5–7 mg/kg daily; Imipenem/cilastatin 250–500 mg IV q6h; Dopamine 2–20 μg/kg/min IV as needed.
Disposition
All patients require admission to a surgical ICU. Cervical perforations may be managed with drainage alone, whereas thoracic and abdominal perforations require operative repair. There is no role for ED discharge.
Consultation and Follow-Up
Immediate involvement of thoracic or general surgery is mandatory. Ongoing management and follow-up are dictated by the surgical team.
Key Clinical Insights And Common Errors
Early chest radiographs may appear normal. Left-sided pleural involvement typically indicates distal esophageal rupture, whereas right-sided involvement suggests a proximal tear. A negative initial esophagram does not exclude injury—repeat imaging in decubitus positions if suspicion remains high. Delays in diagnosis and intervention markedly increase mortality; rapid recognition and early surgical consultation are essential.
Overview and Definitions
Boerhaave syndrome refers to a spontaneous rupture of the esophagus caused by a sudden rise in intra-abdominal pressure combined with negative intrathoracic pressure. This results in a full-thickness, transmural longitudinal tear. The absence of a serosal layer in the esophagus makes it particularly vulnerable to perforation and rapid mediastinal contamination. Preexisting mucosal injury, such as esophagitis, further weakens the wall. Most ruptures occur along the left posterolateral aspect of the distal third of the esophagus. This condition carries very high morbidity and mortality, the highest among gastrointestinal perforations. Overall mortality approaches 20%, and delays beyond 24 hours may double mortality. Cervical perforations have the lowest mortality, followed by abdominal and thoracic ruptures.
Etiology
The most frequent precipitant is forceful vomiting or retching. Other associated triggers include heavy lifting, seizures, childbirth, blunt trauma, induced emesis, caustic ingestion, and laughing. Risk is increased in patients with Barrett ulcer, HIV/AIDS, pill esophagitis, and chronic alcohol use. The condition predominantly affects middle-aged men. Notably, iatrogenic causes account for over half of all esophageal perforations overall.
Pediatric note: Rare; reported in neonates. Always consider caustic ingestion.
Clinical Features
Symptoms are often nonspecific, contributing to diagnostic delay. The most common presentation is acute chest or epigastric pain following vomiting or retching.
Mackler triad—vomiting, chest pain, and subcutaneous emphysema—is classic but uncommon. Chest pain is typically retrosternal and pleuritic, radiates to the back or left shoulder, worsens with swallowing, and may be associated with odynophagia. Swallowing can provoke coughing. A history of heavy alcohol intake is frequently present.
Alert: Subtle or vague symptoms are common and worsen prognosis if diagnosis is delayed.
Physical Examination
Findings may include dyspnea, diaphoresis, tachypnea, fever, and shock in severe cases. Subcutaneous emphysema of the neck or chest wall and mediastinal crepitus (Hamman crunch) may be present. Pleural effusions, usually left-sided, are common. Untreated cases progress to mediastinitis and abscess formation. Hemorrhage is uncommon.
Essential Evaluation
Obtain upright chest radiographs (PA and lateral if tolerated) to assess for pneumomediastinum, subcutaneous emphysema, pleural effusion, pneumothorax, widened mediastinum, hydropneumothorax, empyema, free intraperitoneal air, and the Naclerio V sign.
A contrast esophagram is key to identifying the perforation and guiding management. Contrast choice remains debated: water-soluble agents are less irritating if leaked but less sensitive and dangerous if aspirated, while barium is more sensitive but more irritating to the mediastinum. If the initial study is negative and suspicion remains high, repeat imaging is warranted.
Diagnostic Tests and Interpretation
Laboratory studies include CBC, PT/PTT/INR, and blood cultures. Pleural fluid analysis may show low pH (<6), elevated amylase, and undigested food particles. ecg is useful to exclude cardiac causes.< />pan>
CT chest is sensitive for detecting mediastinal air, periesophageal fluid, and pleural involvement, though it does not localize the tear. Endoscopy is controversial due to risk of worsening the perforation.
Differential Diagnosis
Myocardial infarction, aortic dissection, pneumothorax, pneumonia, pulmonary embolism, pericarditis, pancreatitis, cholecystitis, intestinal obstruction, mesenteric ischemia, lung abscess, ruptured viscus, and benign spontaneous pneumomediastinum.
Management
Prehospital: Secure the airway if needed. Establish two large-bore IV lines and treat hypotension with 0.9% normal saline. Avoid opiates prior to ED arrival when possible.
Initial stabilization: Follow ABCs. Administer 100% oxygen or intubate if airway compromise is present. Give 20 mL/kg crystalloid bolus and initiate dopamine if hypotension persists. Consider central access for unstable patients.
ED care: Keep patient NPO, carefully place a nasogastric tube for decompression, insert a urinary catheter, expedite diagnostic evaluation, and obtain immediate surgical consultation. Definitive treatment is usually surgical repair; endoscopic stenting or conservative management may be considered in selected patients with contained perforations. Begin broad-spectrum IV antibiotics targeting oral and gastrointestinal flora.
Medications
Ampicillin/sulbactam 3 g IV q6h; Gentamicin 2 mg/kg loading dose then 1.7 mg/kg q8h or 5–7 mg/kg daily; Imipenem/cilastatin 250–500 mg IV q6h; Dopamine 2–20 μg/kg/min IV as needed.
Disposition
All patients require admission to a surgical ICU. Cervical perforations may be managed with drainage alone, whereas thoracic and abdominal perforations require operative repair. There is no role for ED discharge.
Consultation and Follow-Up
Immediate involvement of thoracic or general surgery is mandatory. Ongoing management and follow-up are dictated by the surgical team.
Key Clinical Insights And Common Errors
Early chest radiographs may appear normal. Left-sided pleural involvement typically indicates distal esophageal rupture, whereas right-sided involvement suggests a proximal tear. A negative initial esophagram does not exclude injury—repeat imaging in decubitus positions if suspicion remains high. Delays in diagnosis and intervention markedly increase mortality; rapid recognition and early surgical consultation are essential.
