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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 – 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 – 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 – Biologic Weapons
Overview And Scope
Biologic weapons are naturally occurring organisms or toxins that are deliberately purified and disseminated to cause mass morbidity, mortality, and societal disruption. These agents include bacteria, viruses, fungi, and toxins, with more than 400 potential or actualized pathogens capable of weaponization. They are relatively inexpensive compared with other weapons of mass destruction, highly potent, and can be deployed covertly. Their stealth derives from natural incubation periods, as agents are typically invisible, odorless, and tasteless. Patients often present to multiple health care facilities with nonspecific complaints, delaying recognition of a covert release. Exposure occurs through direct skin contact, inhalation of aerosolized particles, or ingestion via contaminated food or water.
Causative Agents
Bacterial agents include Bacillus anthracis (anthrax), Yersinia pestis (plague), Vibrio cholerae (cholera), Francisella tularensis (tularemia), Brucella species (brucellosis), and Coxiella burnetii (Q fever). Viral agents include variola virus (smallpox), alphaviruses causing viral encephalitides such as Venezuelan, Eastern, and Western equine encephalitis, and viral hemorrhagic fevers including Ebola, Marburg, Lassa, and dengue. Toxin-based weapons include ricin, staphylococcal enterotoxin B, botulinum toxin, and mycotoxins.
Clinical Recognition And Patterns
Clinicians must remain alert for unusual illness patterns suggestive of intentional release. Warning signs include geographic clustering of illness among individuals who live or work near one another, atypical age distributions for common diseases, multiple patients presenting with unexplained similar syndromes, a single case of disease caused by a rare or eradicated pathogen, and surges of patients with similar symptoms accompanied by increasing morbidity and mortality.
Key Syndromic Presentations
Inhalational anthrax presents with fever, chills, malaise, cough, dyspnea, chest pain, nausea, diaphoresis, myalgias, tachycardia, and possible meningeal signs. Cutaneous anthrax begins as a painless pruritic papule that evolves into a vesicle and then a necrotic ulcer with a black eschar and surrounding nonpitting edema. Plague manifests with abrupt fever, chills, cough, hemoptysis, dyspnea, headache, vomiting, painful lymphadenopathy (buboes), confusion, abdominal pain, oliguria, ecchymosis, and acral gangrene. Weaponized tularemia most commonly presents in a typhoidal form with fever, headache, malaise, and nonproductive cough, carrying high mortality if untreated. Q fever causes a flu-like illness with pleuritic chest pain and patchy infiltrates on chest imaging, with low mortality even without treatment. Brucellosis presents after a prolonged incubation with flu-like and neuropsychiatric symptoms and focal joint or genitourinary pain. Smallpox begins with a prodrome of fever and myalgias followed by a characteristic centrifugal rash progressing synchronously from macules to pustules and crusts, with high untreated mortality. Viral hemorrhagic fevers evolve from a flu-like illness to gastrointestinal symptoms, organ dysfunction, hemorrhage, shock, and high fatality rates.
Initial Assessment And Workup
Bioterrorism should be suspected when relatively young, healthy patients present with influenza-like illness and deteriorate rapidly or when characteristic cutaneous findings appear. Laboratory evaluation includes complete blood count, electrolytes, renal function, arterial blood gas analysis, blood and wound cultures, coagulation studies, and cerebrospinal fluid analysis when indicated. Imaging is guided by suspected agent, with chest radiography revealing mediastinal widening and pleural effusions in anthrax or bronchopneumonia in plague. Laboratories must be alerted when high-risk pathogens are suspected.
Differential Diagnosis
Consider common infectious mimics such as influenza, bacterial pneumonia, meningitis, varicella, tularemia, and staphylococcal or streptococcal skin infections, as well as noninfectious causes depending on presentation. Distinguishing features include rash distribution, lesion staging, involvement of palms and soles, and systemic toxicity.
Prehospital And Early Management
Universal precautions with appropriate respiratory protection, including N95 masks, are essential. Initial stabilization follows standard airway, breathing, and circulation principles, with intravenous fluids for hypotension, supplemental oxygen for hypoxemia, and vasopressors for refractory shock. Respiratory and contact isolation should be instituted immediately for suspected cases.
Emergency Department Management
Supportive care includes antipyretics and early initiation of disease-specific therapy. Anthrax requires prompt antibiotics, with ciprofloxacin or doxycycline as first-line agents, often in combination with other antibiotics depending on severity and susceptibility. Plague mandates antibiotics within 24 hours, typically streptomycin or gentamicin, with chloramphenicol added for meningitis or severe illness. Brucellosis is treated with prolonged doxycycline-based regimens combined with streptomycin or rifampin. Q fever is often self-limited, though doxycycline shortens illness duration. Smallpox management is supportive, with vaccination within four days of exposure reducing disease severity; secondary bacterial infections should be treated, and exposed staff vaccinated. Management of tularemia and viral hemorrhagic fevers follows established disease-specific protocols.
Disposition And Public Health Coordination
Admission decisions depend on clinical severity and the broader disaster context. Toxic, hypoxic, or unstable patients require inpatient care with isolation. Mild, noncontagious cases may be managed as outpatients when appropriate. Suspected or confirmed cases must be reported immediately to local and state health authorities, with infectious disease and toxicology consultation obtained. Postexposure prophylaxis, vaccination, and occupational health follow-up are critical for exposed personnel.
Critical Insights And Common Errors
Early recognition is challenging, requiring a consistently high index of suspicion. Failure to use appropriate personal protective equipment places health care workers at risk. Geographic clustering of illness, unusual presentations, and rapid clinical deterioration should prompt consideration of a biologic weapon and early initiation of therapy or prophylaxis to reduce morbidity and mortality.
Overview And Scope
Biologic weapons are naturally occurring organisms or toxins that are deliberately purified and disseminated to cause mass morbidity, mortality, and societal disruption. These agents include bacteria, viruses, fungi, and toxins, with more than 400 potential or actualized pathogens capable of weaponization. They are relatively inexpensive compared with other weapons of mass destruction, highly potent, and can be deployed covertly. Their stealth derives from natural incubation periods, as agents are typically invisible, odorless, and tasteless. Patients often present to multiple health care facilities with nonspecific complaints, delaying recognition of a covert release. Exposure occurs through direct skin contact, inhalation of aerosolized particles, or ingestion via contaminated food or water.
Causative Agents
Bacterial agents include Bacillus anthracis (anthrax), Yersinia pestis (plague), Vibrio cholerae (cholera), Francisella tularensis (tularemia), Brucella species (brucellosis), and Coxiella burnetii (Q fever). Viral agents include variola virus (smallpox), alphaviruses causing viral encephalitides such as Venezuelan, Eastern, and Western equine encephalitis, and viral hemorrhagic fevers including Ebola, Marburg, Lassa, and dengue. Toxin-based weapons include ricin, staphylococcal enterotoxin B, botulinum toxin, and mycotoxins.
Clinical Recognition And Patterns
Clinicians must remain alert for unusual illness patterns suggestive of intentional release. Warning signs include geographic clustering of illness among individuals who live or work near one another, atypical age distributions for common diseases, multiple patients presenting with unexplained similar syndromes, a single case of disease caused by a rare or eradicated pathogen, and surges of patients with similar symptoms accompanied by increasing morbidity and mortality.
Key Syndromic Presentations
Inhalational anthrax presents with fever, chills, malaise, cough, dyspnea, chest pain, nausea, diaphoresis, myalgias, tachycardia, and possible meningeal signs. Cutaneous anthrax begins as a painless pruritic papule that evolves into a vesicle and then a necrotic ulcer with a black eschar and surrounding nonpitting edema. Plague manifests with abrupt fever, chills, cough, hemoptysis, dyspnea, headache, vomiting, painful lymphadenopathy (buboes), confusion, abdominal pain, oliguria, ecchymosis, and acral gangrene. Weaponized tularemia most commonly presents in a typhoidal form with fever, headache, malaise, and nonproductive cough, carrying high mortality if untreated. Q fever causes a flu-like illness with pleuritic chest pain and patchy infiltrates on chest imaging, with low mortality even without treatment. Brucellosis presents after a prolonged incubation with flu-like and neuropsychiatric symptoms and focal joint or genitourinary pain. Smallpox begins with a prodrome of fever and myalgias followed by a characteristic centrifugal rash progressing synchronously from macules to pustules and crusts, with high untreated mortality. Viral hemorrhagic fevers evolve from a flu-like illness to gastrointestinal symptoms, organ dysfunction, hemorrhage, shock, and high fatality rates.
Initial Assessment And Workup
Bioterrorism should be suspected when relatively young, healthy patients present with influenza-like illness and deteriorate rapidly or when characteristic cutaneous findings appear. Laboratory evaluation includes complete blood count, electrolytes, renal function, arterial blood gas analysis, blood and wound cultures, coagulation studies, and cerebrospinal fluid analysis when indicated. Imaging is guided by suspected agent, with chest radiography revealing mediastinal widening and pleural effusions in anthrax or bronchopneumonia in plague. Laboratories must be alerted when high-risk pathogens are suspected.
Differential Diagnosis
Consider common infectious mimics such as influenza, bacterial pneumonia, meningitis, varicella, tularemia, and staphylococcal or streptococcal skin infections, as well as noninfectious causes depending on presentation. Distinguishing features include rash distribution, lesion staging, involvement of palms and soles, and systemic toxicity.
Prehospital And Early Management
Universal precautions with appropriate respiratory protection, including N95 masks, are essential. Initial stabilization follows standard airway, breathing, and circulation principles, with intravenous fluids for hypotension, supplemental oxygen for hypoxemia, and vasopressors for refractory shock. Respiratory and contact isolation should be instituted immediately for suspected cases.
Emergency Department Management
Supportive care includes antipyretics and early initiation of disease-specific therapy. Anthrax requires prompt antibiotics, with ciprofloxacin or doxycycline as first-line agents, often in combination with other antibiotics depending on severity and susceptibility. Plague mandates antibiotics within 24 hours, typically streptomycin or gentamicin, with chloramphenicol added for meningitis or severe illness. Brucellosis is treated with prolonged doxycycline-based regimens combined with streptomycin or rifampin. Q fever is often self-limited, though doxycycline shortens illness duration. Smallpox management is supportive, with vaccination within four days of exposure reducing disease severity; secondary bacterial infections should be treated, and exposed staff vaccinated. Management of tularemia and viral hemorrhagic fevers follows established disease-specific protocols.
Disposition And Public Health Coordination
Admission decisions depend on clinical severity and the broader disaster context. Toxic, hypoxic, or unstable patients require inpatient care with isolation. Mild, noncontagious cases may be managed as outpatients when appropriate. Suspected or confirmed cases must be reported immediately to local and state health authorities, with infectious disease and toxicology consultation obtained. Postexposure prophylaxis, vaccination, and occupational health follow-up are critical for exposed personnel.
Critical Insights And Common Errors
Early recognition is challenging, requiring a consistently high index of suspicion. Failure to use appropriate personal protective equipment places health care workers at risk. Geographic clustering of illness, unusual presentations, and rapid clinical deterioration should prompt consideration of a biologic weapon and early initiation of therapy or prophylaxis to reduce morbidity and mortality.
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Emergency and Acute Medicine – Beta-Blocker Poisoning
Foundational Concepts And Mechanism
Under normal physiology, β1-adrenergic receptor stimulation activates adenyl cyclase, converting ATP to cyclic AMP. Cyclic AMP activates protein kinase, leading to phosphorylation of sarcoplasmic reticulum proteins and release of intracellular calcium, which drives excitation–contraction coupling. β-blockers inhibit this pathway, resulting in reduced myocardial contractility and slowed conduction. Some agents possess membrane-stabilizing (sodium channel–blocking) activity that can widen the QRS complex, while others prolong the QTc interval and predispose to ventricular dysrhythmias. Certain β-blockers exhibit intrinsic sympathomimetic (partial agonist) activity. Lipophilic agents such as propranolol, metoprolol, and labetalol readily cross the blood–brain barrier and produce central nervous system toxicity.
Clinical Presentation
Cardiovascular manifestations dominate and include hypotension, bradycardia, conduction delays, varying degrees of heart block, heart failure, electrical–mechanical dissociation, and loss of β-selectivity in overdose. Neurologic effects include coma and seizures, particularly with lipophilic agents. Pulmonary findings may include bronchospasm and pulmonary edema. Metabolic derangements include hypoglycemia, especially in children and patients with limited glycogen stores.
History And Examination
History should assess for medication errors, intentional overdose or suicidal intent, and potential pediatric exposures. Physical examination typically reveals hypotension, bradycardia, and dysrhythmias.
Initial Evaluation
In cases of unknown ingestion, β-blocker toxicity should be suspected in patients presenting with unexplained bradycardia and hypotension. Electrocardiography may reveal sinus bradycardia, first-, second-, or third-degree atrioventricular block, and conduction delays. Laboratory studies include complete blood count, electrolytes, renal function, serum glucose, and toxicology screening when co-ingestants are suspected.
Diagnostic Considerations
The differential diagnosis includes calcium-channel blocker toxicity, clonidine toxicity, digitalis poisoning, and acute myocardial infarction complicated by heart block.
Prehospital And Early Management
Suspected overdose warrants transport of pill bottles when available. Early priorities include airway protection based on mental status, supplemental oxygen, intravenous access with isotonic fluids, continuous hemodynamic monitoring, bedside glucose assessment with prompt correction of hypoglycemia, and administration of naloxone and thiamine for altered mental status. Seizures should be treated with benzodiazepines.
Therapeutic Goals And Emergency Treatment
Management aims to maintain a heart rate above 60 beats per minute, systolic blood pressure above 90 mm Hg, adequate urine output, and improving mental status. Gastrointestinal decontamination with activated charcoal may be beneficial, particularly when co-ingestants are involved. Gastric lavage may be considered within one hour of ingestion, though propranolol may cause esophageal spasm and complicate tube placement. Syrup of ipecac is contraindicated.
Atropine is the initial agent for bradycardia, though response rates are limited. Glucagon is the preferred first-line antidote for β-blocker–induced hemodynamic instability when atropine is ineffective, as it increases cyclic AMP via a non-β-receptor pathway. Nausea and vomiting are common adverse effects. Intravenous fluids should be administered cautiously, with invasive monitoring considered to guide volume resuscitation.
Amrinone, a phosphodiesterase inhibitor, increases cyclic AMP and inotropy and may be used alongside glucagon for persistent bradycardia. Vasopressors are indicated for refractory hypotension, recognizing that higher doses may be required due to β-receptor blockade. Isoproterenol may be titrated for heart rate and blood pressure, while epinephrine provides combined α- and β-agonist effects and is preferred if blood pressure fails to respond. High-dose dopamine is another option.
Sodium bicarbonate is reserved for patients with QRS widening greater than 100 ms due to sodium channel blockade. Electrical pacing is considered when pharmacologic therapy fails. Advanced or experimental therapies, undertaken in consultation with a poison center, include high-dose insulin euglycemia therapy to enhance myocardial metabolism and intravenous lipid emulsion therapy. Hemodialysis may be beneficial for water-soluble agents such as nadolol, atenolol, and sotalol.
Medication Summary
Supportive care includes isotonic fluids and glucose supplementation as needed. Glucagon remains central for hemodynamic instability, with vasopressors added as required. Sodium bicarbonate is used selectively for wide-complex dysrhythmias, and hemodialysis is reserved for specific agents.
Disposition And Follow-Up
Intensive care admission is required for patients with decreased consciousness, bradycardia, hypotension, or conduction abnormalities. Extended observation for at least 24 hours is recommended for long-acting or sustained-release formulations. Patients may be discharged if asymptomatic 8–10 hours after ingestion of immediate-release preparations. Psychiatric evaluation is necessary for intentional overdoses, and poison-prevention counseling should be provided for caregivers in pediatric cases.
Clinical Priorities And Common Pitfalls
β-blocker toxicity should be promptly considered in any patient with unexplained bradycardia and hypotension. Wide-complex dysrhythmias signal sodium channel blockade and warrant sodium bicarbonate therapy. Early recognition and aggressive, mechanism-based treatment are critical to improving outcomes.
Foundational Concepts And Mechanism
Under normal physiology, β1-adrenergic receptor stimulation activates adenyl cyclase, converting ATP to cyclic AMP. Cyclic AMP activates protein kinase, leading to phosphorylation of sarcoplasmic reticulum proteins and release of intracellular calcium, which drives excitation–contraction coupling. β-blockers inhibit this pathway, resulting in reduced myocardial contractility and slowed conduction. Some agents possess membrane-stabilizing (sodium channel–blocking) activity that can widen the QRS complex, while others prolong the QTc interval and predispose to ventricular dysrhythmias. Certain β-blockers exhibit intrinsic sympathomimetic (partial agonist) activity. Lipophilic agents such as propranolol, metoprolol, and labetalol readily cross the blood–brain barrier and produce central nervous system toxicity.
Clinical Presentation
Cardiovascular manifestations dominate and include hypotension, bradycardia, conduction delays, varying degrees of heart block, heart failure, electrical–mechanical dissociation, and loss of β-selectivity in overdose. Neurologic effects include coma and seizures, particularly with lipophilic agents. Pulmonary findings may include bronchospasm and pulmonary edema. Metabolic derangements include hypoglycemia, especially in children and patients with limited glycogen stores.
History And Examination
History should assess for medication errors, intentional overdose or suicidal intent, and potential pediatric exposures. Physical examination typically reveals hypotension, bradycardia, and dysrhythmias.
Initial Evaluation
In cases of unknown ingestion, β-blocker toxicity should be suspected in patients presenting with unexplained bradycardia and hypotension. Electrocardiography may reveal sinus bradycardia, first-, second-, or third-degree atrioventricular block, and conduction delays. Laboratory studies include complete blood count, electrolytes, renal function, serum glucose, and toxicology screening when co-ingestants are suspected.
Diagnostic Considerations
The differential diagnosis includes calcium-channel blocker toxicity, clonidine toxicity, digitalis poisoning, and acute myocardial infarction complicated by heart block.
Prehospital And Early Management
Suspected overdose warrants transport of pill bottles when available. Early priorities include airway protection based on mental status, supplemental oxygen, intravenous access with isotonic fluids, continuous hemodynamic monitoring, bedside glucose assessment with prompt correction of hypoglycemia, and administration of naloxone and thiamine for altered mental status. Seizures should be treated with benzodiazepines.
Therapeutic Goals And Emergency Treatment
Management aims to maintain a heart rate above 60 beats per minute, systolic blood pressure above 90 mm Hg, adequate urine output, and improving mental status. Gastrointestinal decontamination with activated charcoal may be beneficial, particularly when co-ingestants are involved. Gastric lavage may be considered within one hour of ingestion, though propranolol may cause esophageal spasm and complicate tube placement. Syrup of ipecac is contraindicated.
Atropine is the initial agent for bradycardia, though response rates are limited. Glucagon is the preferred first-line antidote for β-blocker–induced hemodynamic instability when atropine is ineffective, as it increases cyclic AMP via a non-β-receptor pathway. Nausea and vomiting are common adverse effects. Intravenous fluids should be administered cautiously, with invasive monitoring considered to guide volume resuscitation.
Amrinone, a phosphodiesterase inhibitor, increases cyclic AMP and inotropy and may be used alongside glucagon for persistent bradycardia. Vasopressors are indicated for refractory hypotension, recognizing that higher doses may be required due to β-receptor blockade. Isoproterenol may be titrated for heart rate and blood pressure, while epinephrine provides combined α- and β-agonist effects and is preferred if blood pressure fails to respond. High-dose dopamine is another option.
Sodium bicarbonate is reserved for patients with QRS widening greater than 100 ms due to sodium channel blockade. Electrical pacing is considered when pharmacologic therapy fails. Advanced or experimental therapies, undertaken in consultation with a poison center, include high-dose insulin euglycemia therapy to enhance myocardial metabolism and intravenous lipid emulsion therapy. Hemodialysis may be beneficial for water-soluble agents such as nadolol, atenolol, and sotalol.
Medication Summary
Supportive care includes isotonic fluids and glucose supplementation as needed. Glucagon remains central for hemodynamic instability, with vasopressors added as required. Sodium bicarbonate is used selectively for wide-complex dysrhythmias, and hemodialysis is reserved for specific agents.
Disposition And Follow-Up
Intensive care admission is required for patients with decreased consciousness, bradycardia, hypotension, or conduction abnormalities. Extended observation for at least 24 hours is recommended for long-acting or sustained-release formulations. Patients may be discharged if asymptomatic 8–10 hours after ingestion of immediate-release preparations. Psychiatric evaluation is necessary for intentional overdoses, and poison-prevention counseling should be provided for caregivers in pediatric cases.
Clinical Priorities And Common Pitfalls
β-blocker toxicity should be promptly considered in any patient with unexplained bradycardia and hypotension. Wide-complex dysrhythmias signal sodium channel blockade and warrant sodium bicarbonate therapy. Early recognition and aggressive, mechanism-based treatment are critical to improving outcomes.
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Emergency and Acute Medicine – Benzodiazepine Poisoning
Clinical Overview
Benzodiazepines enhance the activity of γ-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the central nervous system, by binding to a specific allosteric site and increasing the frequency of chloride channel opening. This results in neuronal membrane hyperpolarization and suppression of cellular excitation. Additional effects include depression of spinal reflexes and the reticular activating system. Benzodiazepines are rapidly absorbed from the gastrointestinal tract, are highly protein bound, have a large volume of distribution, and undergo hepatic metabolism. Duration of action is inversely related to lipophilicity, with more lipophilic agents entering the CNS faster; clinically, the duration of effect follows lorazepam greater than diazepam greater than midazolam. Toxicity is potentiated when combined with other sedative–hypnotics such as ethanol, barbiturates, or propofol.
Clinical Manifestations
Central nervous system effects include sedation, drowsiness, slurred speech, delirium, coma, and typically midrange or small pupils. Neuromuscular findings include incoordination, slowed voluntary movements, ataxia, hypotension, and hyporeflexia or areflexia. Cardiovascular depression is usually mild, and isolated benzodiazepine ingestion is rarely lethal. Respiratory depression is generally mild compared with barbiturates but is more pronounced with short-acting agents and intravenous formulations. Gastrointestinal symptoms may include nausea, vomiting, and diarrhea. Other findings include hypothermia. Complications can include cerebral hypoxia, rhabdomyolysis, and pressure-related neuropathies, though there is no long-term organ toxicity. In pediatric patients, paradoxical agitation or restlessness may occur.
Diagnostic Approach
Diagnosis is primarily clinical, based on a history of ingestion or injection and findings of CNS depression, with lack of response to naloxone. Continuous pulse oximetry is essential. Laboratory evaluation includes electrolytes, blood urea nitrogen, creatinine, serum glucose, thyroid studies, arterial blood gas when indicated, and urinalysis for myoglobin in comatose patients or those immobilized for prolonged periods. Qualitative urine benzodiazepine screens may confirm exposure but do not correlate with severity and can yield false negatives, as many agents such as clonazepam, lorazepam, midazolam, and alprazolam are not detected. Serum benzodiazepine levels are not useful acutely. Additional studies include alcohol level, barbiturate level if suspected, acetaminophen and salicylate levels in possible self-harm, pregnancy testing, ECG, chest radiography for aspiration, and head CT when clinically indicated.
Differential Considerations
Alternative causes of depressed mental status include hypoglycemia, other sedative–hypnotics, antidepressants or antipsychotics, opioids, anticonvulsants, carbon monoxide or cyanide exposure, alcohol intoxication, hypoxemia, hypothermia, head trauma, CNS infection, and metabolic or electrolyte derangements.
Initial And Emergency Management
Prehospital care focuses on airway protection, oxygenation, cardiac monitoring, intravenous access, rapid glucose assessment, and retrieval of pill containers when overdose is suspected. Initial stabilization prioritizes airway, breathing, and circulation with supplemental oxygen, intravenous isotonic fluids, and continuous monitoring. Naloxone, thiamine, and dextrose should be administered in comatose or altered patients to address reversible causes.
In the emergency department, gastric lavage may be considered only within one hour of a life-threatening ingestion with a protected airway. Activated charcoal may be administered orally or via nasogastric tube if the airway is secure. There is no role for forced diuresis, dialysis, or charcoal hemoperfusion.
Role Of Flumazenil
Flumazenil is a competitive benzodiazepine receptor antagonist that rapidly reverses benzodiazepine-induced coma, with onset in one to two minutes and a short duration of action. Its use is limited to carefully selected patients, such as non-habituated individuals with isolated benzodiazepine overdose, normal vital signs, normal ECG, and no coingestions. It is most useful in iatrogenic sedation. Flumazenil should not be used empirically or in patients with seizure risk, tricyclic antidepressant coingestion, benzodiazepine dependence, abnormal vital signs, hypoxia, dysrhythmias, hypotension, or increased intracranial pressure, as it may precipitate withdrawal seizures or arrhythmias.
Pharmacologic Therapy
Activated charcoal may be given at 1 g/kg if appropriate. Hypoglycemia should be treated with intravenous dextrose, and thiamine administered when indicated. Flumazenil dosing begins with 0.2 mg IV over 30 seconds, titrated cautiously to effect, with close monitoring for resedation. Continuous infusion may be required in select cases. Naloxone and thiamine remain part of supportive care when the diagnosis is uncertain.
Disposition And Follow-Up
Admission is required for patients with persistent or profound CNS depression, respiratory or cardiovascular compromise, or significant coingestions. Patients may be discharged after at least four hours of observation if asymptomatic; those receiving flumazenil require extended observation for recurrent sedation. Intentional overdoses warrant psychiatric evaluation. Patients with chronic benzodiazepine use should be counseled regarding withdrawal risks, including autonomic instability, tremor, paresthesias, and seizures.
Key Clinical Insights And Common Errors
Benzodiazepine toxicity is primarily supportive in management, and isolated overdoses are seldom fatal. Clinical presentation is more informative than drug levels or toxicology screens. Flumazenil should be reserved for select cases, as inappropriate use can precipitate seizures or dysrhythmias. Intravenous formulations containing propylene glycol may cause elevated osmolar gap and anion gap metabolic acidosis, a consideration often overlooked in critically ill patients.
Clinical Overview
Benzodiazepines enhance the activity of γ-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the central nervous system, by binding to a specific allosteric site and increasing the frequency of chloride channel opening. This results in neuronal membrane hyperpolarization and suppression of cellular excitation. Additional effects include depression of spinal reflexes and the reticular activating system. Benzodiazepines are rapidly absorbed from the gastrointestinal tract, are highly protein bound, have a large volume of distribution, and undergo hepatic metabolism. Duration of action is inversely related to lipophilicity, with more lipophilic agents entering the CNS faster; clinically, the duration of effect follows lorazepam greater than diazepam greater than midazolam. Toxicity is potentiated when combined with other sedative–hypnotics such as ethanol, barbiturates, or propofol.
Clinical Manifestations
Central nervous system effects include sedation, drowsiness, slurred speech, delirium, coma, and typically midrange or small pupils. Neuromuscular findings include incoordination, slowed voluntary movements, ataxia, hypotension, and hyporeflexia or areflexia. Cardiovascular depression is usually mild, and isolated benzodiazepine ingestion is rarely lethal. Respiratory depression is generally mild compared with barbiturates but is more pronounced with short-acting agents and intravenous formulations. Gastrointestinal symptoms may include nausea, vomiting, and diarrhea. Other findings include hypothermia. Complications can include cerebral hypoxia, rhabdomyolysis, and pressure-related neuropathies, though there is no long-term organ toxicity. In pediatric patients, paradoxical agitation or restlessness may occur.
Diagnostic Approach
Diagnosis is primarily clinical, based on a history of ingestion or injection and findings of CNS depression, with lack of response to naloxone. Continuous pulse oximetry is essential. Laboratory evaluation includes electrolytes, blood urea nitrogen, creatinine, serum glucose, thyroid studies, arterial blood gas when indicated, and urinalysis for myoglobin in comatose patients or those immobilized for prolonged periods. Qualitative urine benzodiazepine screens may confirm exposure but do not correlate with severity and can yield false negatives, as many agents such as clonazepam, lorazepam, midazolam, and alprazolam are not detected. Serum benzodiazepine levels are not useful acutely. Additional studies include alcohol level, barbiturate level if suspected, acetaminophen and salicylate levels in possible self-harm, pregnancy testing, ECG, chest radiography for aspiration, and head CT when clinically indicated.
Differential Considerations
Alternative causes of depressed mental status include hypoglycemia, other sedative–hypnotics, antidepressants or antipsychotics, opioids, anticonvulsants, carbon monoxide or cyanide exposure, alcohol intoxication, hypoxemia, hypothermia, head trauma, CNS infection, and metabolic or electrolyte derangements.
Initial And Emergency Management
Prehospital care focuses on airway protection, oxygenation, cardiac monitoring, intravenous access, rapid glucose assessment, and retrieval of pill containers when overdose is suspected. Initial stabilization prioritizes airway, breathing, and circulation with supplemental oxygen, intravenous isotonic fluids, and continuous monitoring. Naloxone, thiamine, and dextrose should be administered in comatose or altered patients to address reversible causes.
In the emergency department, gastric lavage may be considered only within one hour of a life-threatening ingestion with a protected airway. Activated charcoal may be administered orally or via nasogastric tube if the airway is secure. There is no role for forced diuresis, dialysis, or charcoal hemoperfusion.
Role Of Flumazenil
Flumazenil is a competitive benzodiazepine receptor antagonist that rapidly reverses benzodiazepine-induced coma, with onset in one to two minutes and a short duration of action. Its use is limited to carefully selected patients, such as non-habituated individuals with isolated benzodiazepine overdose, normal vital signs, normal ECG, and no coingestions. It is most useful in iatrogenic sedation. Flumazenil should not be used empirically or in patients with seizure risk, tricyclic antidepressant coingestion, benzodiazepine dependence, abnormal vital signs, hypoxia, dysrhythmias, hypotension, or increased intracranial pressure, as it may precipitate withdrawal seizures or arrhythmias.
Pharmacologic Therapy
Activated charcoal may be given at 1 g/kg if appropriate. Hypoglycemia should be treated with intravenous dextrose, and thiamine administered when indicated. Flumazenil dosing begins with 0.2 mg IV over 30 seconds, titrated cautiously to effect, with close monitoring for resedation. Continuous infusion may be required in select cases. Naloxone and thiamine remain part of supportive care when the diagnosis is uncertain.
Disposition And Follow-Up
Admission is required for patients with persistent or profound CNS depression, respiratory or cardiovascular compromise, or significant coingestions. Patients may be discharged after at least four hours of observation if asymptomatic; those receiving flumazenil require extended observation for recurrent sedation. Intentional overdoses warrant psychiatric evaluation. Patients with chronic benzodiazepine use should be counseled regarding withdrawal risks, including autonomic instability, tremor, paresthesias, and seizures.
Key Clinical Insights And Common Errors
Benzodiazepine toxicity is primarily supportive in management, and isolated overdoses are seldom fatal. Clinical presentation is more informative than drug levels or toxicology screens. Flumazenil should be reserved for select cases, as inappropriate use can precipitate seizures or dysrhythmias. Intravenous formulations containing propylene glycol may cause elevated osmolar gap and anion gap metabolic acidosis, a consideration often overlooked in critically ill patients.
- Published on
Emergency and Acute Medicine – Bell’s Palsy
Overview And Clinical Definition
Bell’s palsy is an acute, idiopathic peripheral seventh cranial nerve (facial nerve) palsy. It is the most common cause of facial nerve paralysis in both adults and children. Spontaneous recovery occurs in approximately 85% of patients without treatment. Prognosis correlates with severity, with partial lesions recovering more reliably than complete paralysis. Clinical improvement usually begins within two weeks, often with return of taste sensation first, and recovery is typically complete within two to three months. Advanced age and delayed recovery are associated with worse outcomes. Men and women are affected equally, most commonly between the third and fifth decades, though all ages may be affected. Diabetes and pregnancy increase risk, and annual incidence ranges from 15 to 40 per 100,000.
Etiology And Pathophysiology
By definition, Bell’s palsy is idiopathic, though viral reactivation—most notably herpes simplex virus—is strongly suspected. Other infectious causes of peripheral facial nerve palsy include Lyme disease, Epstein–Barr virus, and varicella-zoster virus. The underlying mechanism is thought to be edema and degeneration of the facial nerve within the stylomastoid foramen. Because the forehead receives bilateral cortical innervation, only peripheral or brainstem lesions produce unilateral forehead weakness; isolated cortical lesions spare forehead movement.
Clinical Presentation
Patients typically report sudden onset unilateral facial droop with incomplete eyelid closure and loss of forehead muscle tone. Maximal weakness is reached within five days in nearly all cases, and within two days in about half. Associated features include excessive tearing or eye dryness, reduced blinking, subjective facial numbness, drooling, altered taste, hyperacusis, mastoid fullness or pain, and a frequent viral prodrome. On examination, there is isolated unilateral facial weakness involving both upper and lower face. Loss of forehead movement confirms a peripheral lesion. The remainder of the neurologic examination, including other cranial nerves and limb motor function, should be normal. The Bell phenomenon, upward rolling of the eye during attempted eyelid closure, may be observed.
Diagnostic Evaluation
Diagnosis is clinical and based on history and physical examination. Routine laboratory testing and imaging are not required. Lyme serology should be obtained in endemic regions or when clinical suspicion exists. Testing for infectious mononucleosis may be appropriate when EBV is suspected. Imaging is reserved for atypical cases or when alternative diagnoses such as tumor, mastoiditis, or central nervous system pathology are suspected.
Differential Diagnosis
Important alternatives include brainstem lesions, which typically involve additional cranial nerves or extraocular movement abnormalities; Lyme disease; Ramsay Hunt syndrome, suggested by vesicular rash, tinnitus, or vertigo; infectious mononucleosis; parotid or acoustic tumors; trauma; postoperative or infectious middle ear pathology; meningitis; Guillain–Barré syndrome; basilar artery aneurysm; early HIV infection; and bilateral facial palsy due to systemic disease such as sarcoidosis or leukemia. Rare recurrence of idiopathic palsy can occur without change in management.
Emergency Management
Patients with isolated peripheral facial nerve palsy are hemodynamically stable. Primary ED management focuses on eye protection to prevent corneal injury due to impaired eyelid closure. Lubricating ophthalmic preparations are essential, with eye patching at night as needed. Oral corticosteroids started within one week of symptom onset, ideally within 72 hours, improve recovery rates with minimal risk. Antiviral therapy combined with steroids may offer additional benefit in severe cases, though evidence is mixed. When Lyme disease is suspected, appropriate antibiotic therapy should be initiated. Surgical decompression is rarely considered and remains controversial, reserved for severe cases without improvement.
Medications
First-line therapy includes artificial tears or lubricating ophthalmic ointment as needed and prednisone 30–40 mg orally twice daily for seven days, with pediatric dosing adjusted by weight. In more severe presentations, valacyclovir 1 g orally three times daily for seven days may be added.
Disposition And Follow-Up
Hospital admission is not required for isolated Bell’s palsy. Patients may be safely discharged with outpatient management. Follow-up within one week is recommended to assess recovery and ensure adequate eye protection.
Key Clinical Lessons And Common Errors
Isolated seventh nerve weakness must involve both upper and lower face to support Bell’s palsy. Preservation of forehead movement indicates a central lesion and mandates further evaluation. A normal neurologic examination elsewhere is essential for diagnosis. Eye protection is critical to prevent corneal injury. Corticosteroids improve outcomes when given early, while antivirals remain optional and situation dependent.
Overview And Clinical Definition
Bell’s palsy is an acute, idiopathic peripheral seventh cranial nerve (facial nerve) palsy. It is the most common cause of facial nerve paralysis in both adults and children. Spontaneous recovery occurs in approximately 85% of patients without treatment. Prognosis correlates with severity, with partial lesions recovering more reliably than complete paralysis. Clinical improvement usually begins within two weeks, often with return of taste sensation first, and recovery is typically complete within two to three months. Advanced age and delayed recovery are associated with worse outcomes. Men and women are affected equally, most commonly between the third and fifth decades, though all ages may be affected. Diabetes and pregnancy increase risk, and annual incidence ranges from 15 to 40 per 100,000.
Etiology And Pathophysiology
By definition, Bell’s palsy is idiopathic, though viral reactivation—most notably herpes simplex virus—is strongly suspected. Other infectious causes of peripheral facial nerve palsy include Lyme disease, Epstein–Barr virus, and varicella-zoster virus. The underlying mechanism is thought to be edema and degeneration of the facial nerve within the stylomastoid foramen. Because the forehead receives bilateral cortical innervation, only peripheral or brainstem lesions produce unilateral forehead weakness; isolated cortical lesions spare forehead movement.
Clinical Presentation
Patients typically report sudden onset unilateral facial droop with incomplete eyelid closure and loss of forehead muscle tone. Maximal weakness is reached within five days in nearly all cases, and within two days in about half. Associated features include excessive tearing or eye dryness, reduced blinking, subjective facial numbness, drooling, altered taste, hyperacusis, mastoid fullness or pain, and a frequent viral prodrome. On examination, there is isolated unilateral facial weakness involving both upper and lower face. Loss of forehead movement confirms a peripheral lesion. The remainder of the neurologic examination, including other cranial nerves and limb motor function, should be normal. The Bell phenomenon, upward rolling of the eye during attempted eyelid closure, may be observed.
Diagnostic Evaluation
Diagnosis is clinical and based on history and physical examination. Routine laboratory testing and imaging are not required. Lyme serology should be obtained in endemic regions or when clinical suspicion exists. Testing for infectious mononucleosis may be appropriate when EBV is suspected. Imaging is reserved for atypical cases or when alternative diagnoses such as tumor, mastoiditis, or central nervous system pathology are suspected.
Differential Diagnosis
Important alternatives include brainstem lesions, which typically involve additional cranial nerves or extraocular movement abnormalities; Lyme disease; Ramsay Hunt syndrome, suggested by vesicular rash, tinnitus, or vertigo; infectious mononucleosis; parotid or acoustic tumors; trauma; postoperative or infectious middle ear pathology; meningitis; Guillain–Barré syndrome; basilar artery aneurysm; early HIV infection; and bilateral facial palsy due to systemic disease such as sarcoidosis or leukemia. Rare recurrence of idiopathic palsy can occur without change in management.
Emergency Management
Patients with isolated peripheral facial nerve palsy are hemodynamically stable. Primary ED management focuses on eye protection to prevent corneal injury due to impaired eyelid closure. Lubricating ophthalmic preparations are essential, with eye patching at night as needed. Oral corticosteroids started within one week of symptom onset, ideally within 72 hours, improve recovery rates with minimal risk. Antiviral therapy combined with steroids may offer additional benefit in severe cases, though evidence is mixed. When Lyme disease is suspected, appropriate antibiotic therapy should be initiated. Surgical decompression is rarely considered and remains controversial, reserved for severe cases without improvement.
Medications
First-line therapy includes artificial tears or lubricating ophthalmic ointment as needed and prednisone 30–40 mg orally twice daily for seven days, with pediatric dosing adjusted by weight. In more severe presentations, valacyclovir 1 g orally three times daily for seven days may be added.
Disposition And Follow-Up
Hospital admission is not required for isolated Bell’s palsy. Patients may be safely discharged with outpatient management. Follow-up within one week is recommended to assess recovery and ensure adequate eye protection.
Key Clinical Lessons And Common Errors
Isolated seventh nerve weakness must involve both upper and lower face to support Bell’s palsy. Preservation of forehead movement indicates a central lesion and mandates further evaluation. A normal neurologic examination elsewhere is essential for diagnosis. Eye protection is critical to prevent corneal injury. Corticosteroids improve outcomes when given early, while antivirals remain optional and situation dependent.
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Emergency and Acute Medicine – Bath Salts (Synthetic Cathinones) Poisoning
Overview And Definitions
“Bath salts” is a nonspecific term used for designer drugs containing synthetic cathinones, most commonly 3,4-methylenedioxypyrovalerone (MDPV) in the United States, along with mephedrone, methylone, and numerous related compounds. These substances are highly addictive central nervous system stimulants with frequent hallucinogenic effects, producing clinical manifestations similar to cocaine, methamphetamine, or MDMA. Products are marketed under names such as Aura, Cloud 9, Ivory Wave, Vanilla Sky, and White Rush, often labeled “not for human consumption” and falsely sold as bath salts, plant food, or insect repellents to evade regulation. They appear as powders, tablets, or crystals of varying colors and may be ingested, snorted, smoked, or injected. Reported complications include severe delirium, psychosis, violent behavior, hyperthermia, rhabdomyolysis, multiorgan failure, DIC, myocardial infarction, stroke, and death.
Epidemiology
Use in the United States was first reported in 2010, with earlier reports in Europe dating to 2004. By 2011, synthetic cathinones were described as a major emerging drug problem, prompting temporary DEA Schedule I classification. Despite regulation, availability persists through retail outlets and online sources, with thousands of poison center reports nationwide.
Etiology And Pathophysiology
MDPV and related agents are structurally similar to cathinone, a stimulant alkaloid derived from the khat plant. Toxicity results primarily from potent effects on dopamine, norepinephrine, and serotonin reuptake and release. Frequent chemical modification of these agents complicates detection and regulation, and the toxic contribution of adulterants remains poorly defined.
Clinical Presentation
History is often limited or unobtainable, with collateral information from bystanders frequently required. Suspicion should be high when severe agitation or delirium occurs without an alternative explanation. Physical findings are nonspecific but typically reflect a sympathomimetic toxidrome, including hyperthermia, tachycardia, hypertension, dysrhythmias, diaphoresis, mydriasis, hyperreflexia, seizures, respiratory distress, and rhabdomyolysis. Prominent neuropsychiatric manifestations include agitation, hallucinations, paranoia, psychosis, excited delirium, aggression, panic attacks, insomnia, and suicidal ideation.
Evaluation
Assessment focuses on determining severity of intoxication and excluding competing medical or toxicologic causes of altered mental status. No routine ED assay reliably detects MDPV; confirmatory testing is limited to reference laboratories and is not available acutely. Laboratory evaluation should include CBC, basic metabolic panel, liver profile, coagulation studies, creatine kinase, lactate, and acid–base status, with toxicology screens used to identify coingestants. Imaging such as head CT is reserved for trauma or focal neurologic concern. ECG monitoring is essential to assess QRS and QT intervals and detect dysrhythmias.
Differential Diagnosis
Consider cocaine or amphetamine intoxication, anticholinergic toxicity, MDMA exposure, ethanol intoxication or withdrawal, serotonin syndrome, primary psychiatric illness, and infectious or metabolic causes of delirium.
Emergency Management
Prehospital care prioritizes airway protection, oxygenation, IV access, glucose assessment, and rapid transport. In the ED, management is supportive with continuous cardiac and temperature monitoring. Benzodiazepines are first-line therapy for agitation, seizures, and sympathomimetic effects. Active cooling measures, including ice packs, misting, fans, cooling blankets, and cooled IV fluids, are indicated for hyperthermia. Physical restraints should be used sparingly and only to prevent immediate harm. Severe or refractory cases may require endotracheal intubation, with propofol preferred for sedation when necessary. Antipsychotics should be used cautiously due to risks of seizure threshold reduction, extrapyramidal effects, and dysrhythmias. Consultation with a poison control center or medical toxicologist is strongly recommended.
Medications
Lorazepam is administered in 2–4 mg IV or IM increments, and diazepam in 10–30 mg IV or IM increments, titrated to effect.
Disposition And Follow-Up
All symptomatic patients require hospital admission for observation and monitoring. Severe intoxication with hyperthermia, cardiovascular instability, uncontrolled hypertension, or persistent altered mental status warrants ICU care. Only patients who remain completely asymptomatic after an adequate observation period may be discharged, with timing guided by poison control consultation. Outpatient follow-up with primary care is advised after discharge.
Key Clinical Considerations And Diagnostic Traps
A sympathomimetic toxidrome accompanied by delirium or psychosis should prompt consideration of synthetic cathinone exposure. Hyperthermia is a major driver of morbidity and must be treated aggressively. Management is largely supportive, with benzodiazepines forming the cornerstone of therapy, as no antidote exists.
Overview And Definitions
“Bath salts” is a nonspecific term used for designer drugs containing synthetic cathinones, most commonly 3,4-methylenedioxypyrovalerone (MDPV) in the United States, along with mephedrone, methylone, and numerous related compounds. These substances are highly addictive central nervous system stimulants with frequent hallucinogenic effects, producing clinical manifestations similar to cocaine, methamphetamine, or MDMA. Products are marketed under names such as Aura, Cloud 9, Ivory Wave, Vanilla Sky, and White Rush, often labeled “not for human consumption” and falsely sold as bath salts, plant food, or insect repellents to evade regulation. They appear as powders, tablets, or crystals of varying colors and may be ingested, snorted, smoked, or injected. Reported complications include severe delirium, psychosis, violent behavior, hyperthermia, rhabdomyolysis, multiorgan failure, DIC, myocardial infarction, stroke, and death.
Epidemiology
Use in the United States was first reported in 2010, with earlier reports in Europe dating to 2004. By 2011, synthetic cathinones were described as a major emerging drug problem, prompting temporary DEA Schedule I classification. Despite regulation, availability persists through retail outlets and online sources, with thousands of poison center reports nationwide.
Etiology And Pathophysiology
MDPV and related agents are structurally similar to cathinone, a stimulant alkaloid derived from the khat plant. Toxicity results primarily from potent effects on dopamine, norepinephrine, and serotonin reuptake and release. Frequent chemical modification of these agents complicates detection and regulation, and the toxic contribution of adulterants remains poorly defined.
Clinical Presentation
History is often limited or unobtainable, with collateral information from bystanders frequently required. Suspicion should be high when severe agitation or delirium occurs without an alternative explanation. Physical findings are nonspecific but typically reflect a sympathomimetic toxidrome, including hyperthermia, tachycardia, hypertension, dysrhythmias, diaphoresis, mydriasis, hyperreflexia, seizures, respiratory distress, and rhabdomyolysis. Prominent neuropsychiatric manifestations include agitation, hallucinations, paranoia, psychosis, excited delirium, aggression, panic attacks, insomnia, and suicidal ideation.
Evaluation
Assessment focuses on determining severity of intoxication and excluding competing medical or toxicologic causes of altered mental status. No routine ED assay reliably detects MDPV; confirmatory testing is limited to reference laboratories and is not available acutely. Laboratory evaluation should include CBC, basic metabolic panel, liver profile, coagulation studies, creatine kinase, lactate, and acid–base status, with toxicology screens used to identify coingestants. Imaging such as head CT is reserved for trauma or focal neurologic concern. ECG monitoring is essential to assess QRS and QT intervals and detect dysrhythmias.
Differential Diagnosis
Consider cocaine or amphetamine intoxication, anticholinergic toxicity, MDMA exposure, ethanol intoxication or withdrawal, serotonin syndrome, primary psychiatric illness, and infectious or metabolic causes of delirium.
Emergency Management
Prehospital care prioritizes airway protection, oxygenation, IV access, glucose assessment, and rapid transport. In the ED, management is supportive with continuous cardiac and temperature monitoring. Benzodiazepines are first-line therapy for agitation, seizures, and sympathomimetic effects. Active cooling measures, including ice packs, misting, fans, cooling blankets, and cooled IV fluids, are indicated for hyperthermia. Physical restraints should be used sparingly and only to prevent immediate harm. Severe or refractory cases may require endotracheal intubation, with propofol preferred for sedation when necessary. Antipsychotics should be used cautiously due to risks of seizure threshold reduction, extrapyramidal effects, and dysrhythmias. Consultation with a poison control center or medical toxicologist is strongly recommended.
Medications
Lorazepam is administered in 2–4 mg IV or IM increments, and diazepam in 10–30 mg IV or IM increments, titrated to effect.
Disposition And Follow-Up
All symptomatic patients require hospital admission for observation and monitoring. Severe intoxication with hyperthermia, cardiovascular instability, uncontrolled hypertension, or persistent altered mental status warrants ICU care. Only patients who remain completely asymptomatic after an adequate observation period may be discharged, with timing guided by poison control consultation. Outpatient follow-up with primary care is advised after discharge.
Key Clinical Considerations And Diagnostic Traps
A sympathomimetic toxidrome accompanied by delirium or psychosis should prompt consideration of synthetic cathinone exposure. Hyperthermia is a major driver of morbidity and must be treated aggressively. Management is largely supportive, with benzodiazepines forming the cornerstone of therapy, as no antidote exists.
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Emergency and Acute Medicine – Calcium Channel Blocker Poisoning
Overview and Definitions
Calcium channel blocker (CCB) poisoning is a potentially life-threatening intoxication resulting from inhibition of calcium influx into cardiac and smooth muscle cells. This leads to impaired myocardial contractility, decreased vascular tone, and conduction abnormalities. CCB toxicity is associated with significant morbidity and mortality and requires early recognition and aggressive supportive care.
Three major classes of calcium channel blockers exist. Phenylalkylamines (verapamil) primarily affect the myocardium, producing negative chronotropic and inotropic effects with hypotension and bradycardia, without reflex tachycardia. Dihydropyridines (e.g., nifedipine) predominantly cause peripheral vasodilation leading to hypotension, often accompanied by reflex tachycardia. Benzothiazepines (diltiazem) have combined cardiac and vascular effects, with initial increases in heart rate and cardiac output followed by bradycardia and hypotension.
Calcium plays a critical role in cardiac and smooth muscle contraction and in insulin secretion from pancreatic beta cells. Blockade of calcium channels results in decreased contractility, impaired conduction, and reduced insulin release, leading to hyperglycemia, which is a hallmark of severe toxicity.
Etiology and Pathophysiology
CCB toxicity occurs following intentional overdose, medication errors, or accidental pediatric ingestion. Sustained-release formulations are particularly dangerous due to delayed onset and prolonged toxicity. Inhibition of calcium entry into myocardial cells reduces cardiac output and slows atrioventricular conduction, while vascular smooth muscle relaxation causes profound hypotension. Concurrent inhibition of insulin secretion leads to myocardial energy failure due to impaired carbohydrate utilization, contributing to shock and refractory hypotension.
Diagnosis
Signs and Symptoms
Cardiovascular manifestations include hypotension, bradycardia, reflex tachycardia (particularly with dihydropyridines), conduction delays, and high-grade heart blocks. Neurologic findings include altered mental status, agitation, seizures, and coma. Metabolic abnormalities include hyperglycemia and metabolic acidosis. Patients may appear warm rather than cool despite shock.
Essential Workup
A 12-lead ECG is mandatory to evaluate for bradycardia, QRS prolongation, and heart block. Continuous cardiac and hemodynamic monitoring is required.
Diagnostic Tests and Interpretation
Laboratory evaluation includes serum electrolytes, BUN, creatinine, glucose, CBC, and ionized calcium levels when calcium therapy is administered. Digoxin levels should be obtained in patients on digoxin prior to calcium administration. Hyperglycemia in the setting of bradycardia and hypotension strongly suggests CCB poisoning. Toxicology screening should be considered if co-ingestants are suspected.
Differential Diagnosis
β-blocker toxicity, clonidine toxicity, digoxin toxicity, and acute myocardial infarction with heart block.
Management
Prehospital Care
Transport all pill bottles to the emergency department. Administer calcium in unstable patients when CCB overdose is suspected.
Initial Stabilization and Therapy
Initial management follows ABC principles with early airway protection as needed. Supplemental oxygen, IV access with isotonic fluids, and continuous cardiac monitoring are essential.
Emergency Department Management
Therapeutic goals include maintaining heart rate above 60 beats/min, systolic blood pressure above 90 mm Hg, adequate urine output, and improving mental status. Syrup of ipecac is contraindicated. Activated charcoal may be considered early, particularly in sustained-release ingestions or co-ingestants.
Calcium therapy provides transient improvement. Calcium gluconate is preferred due to reduced tissue toxicity, while calcium chloride is more potent but risks extravasation injury. Calcium is contraindicated in digoxin toxicity. IV fluids should be administered cautiously. Atropine is usually ineffective.
High-dose insulin euglycemia therapy is a cornerstone of treatment, improving myocardial carbohydrate utilization and hemodynamics. Vasopressors such as dopamine, epinephrine, or norepinephrine may be required. Amrinone may improve inotropy. Electrical pacing is reserved for refractory cases. IV lipid emulsion and hypertonic sodium bicarbonate may be considered as rescue therapies.
Disposition and Follow-Up
Patients with symptoms or sustained-release ingestion require admission to a monitored setting. Asymptomatic patients who ingest immediate-release formulations may be discharged after 8 hours of observation. Psychiatric evaluation is required for intentional overdoses. Caregiver education is essential for pediatric exposures
Clinical Pearls and Pitfalls
Consider CCB toxicity in any patient presenting with unexplained hypotension, bradycardia, and hyperglycemia. Do not rely on atropine alone. Early initiation of high-dose insulin therapy improves outcomes. Sustained-release preparations may cause delayed and prolonged toxicity.
Overview and Definitions
Calcium channel blocker (CCB) poisoning is a potentially life-threatening intoxication resulting from inhibition of calcium influx into cardiac and smooth muscle cells. This leads to impaired myocardial contractility, decreased vascular tone, and conduction abnormalities. CCB toxicity is associated with significant morbidity and mortality and requires early recognition and aggressive supportive care.
Three major classes of calcium channel blockers exist. Phenylalkylamines (verapamil) primarily affect the myocardium, producing negative chronotropic and inotropic effects with hypotension and bradycardia, without reflex tachycardia. Dihydropyridines (e.g., nifedipine) predominantly cause peripheral vasodilation leading to hypotension, often accompanied by reflex tachycardia. Benzothiazepines (diltiazem) have combined cardiac and vascular effects, with initial increases in heart rate and cardiac output followed by bradycardia and hypotension.
Calcium plays a critical role in cardiac and smooth muscle contraction and in insulin secretion from pancreatic beta cells. Blockade of calcium channels results in decreased contractility, impaired conduction, and reduced insulin release, leading to hyperglycemia, which is a hallmark of severe toxicity.
Etiology and Pathophysiology
CCB toxicity occurs following intentional overdose, medication errors, or accidental pediatric ingestion. Sustained-release formulations are particularly dangerous due to delayed onset and prolonged toxicity. Inhibition of calcium entry into myocardial cells reduces cardiac output and slows atrioventricular conduction, while vascular smooth muscle relaxation causes profound hypotension. Concurrent inhibition of insulin secretion leads to myocardial energy failure due to impaired carbohydrate utilization, contributing to shock and refractory hypotension.
Diagnosis
Signs and Symptoms
Cardiovascular manifestations include hypotension, bradycardia, reflex tachycardia (particularly with dihydropyridines), conduction delays, and high-grade heart blocks. Neurologic findings include altered mental status, agitation, seizures, and coma. Metabolic abnormalities include hyperglycemia and metabolic acidosis. Patients may appear warm rather than cool despite shock.
Essential Workup
A 12-lead ECG is mandatory to evaluate for bradycardia, QRS prolongation, and heart block. Continuous cardiac and hemodynamic monitoring is required.
Diagnostic Tests and Interpretation
Laboratory evaluation includes serum electrolytes, BUN, creatinine, glucose, CBC, and ionized calcium levels when calcium therapy is administered. Digoxin levels should be obtained in patients on digoxin prior to calcium administration. Hyperglycemia in the setting of bradycardia and hypotension strongly suggests CCB poisoning. Toxicology screening should be considered if co-ingestants are suspected.
Differential Diagnosis
β-blocker toxicity, clonidine toxicity, digoxin toxicity, and acute myocardial infarction with heart block.
Management
Prehospital Care
Transport all pill bottles to the emergency department. Administer calcium in unstable patients when CCB overdose is suspected.
Initial Stabilization and Therapy
Initial management follows ABC principles with early airway protection as needed. Supplemental oxygen, IV access with isotonic fluids, and continuous cardiac monitoring are essential.
Emergency Department Management
Therapeutic goals include maintaining heart rate above 60 beats/min, systolic blood pressure above 90 mm Hg, adequate urine output, and improving mental status. Syrup of ipecac is contraindicated. Activated charcoal may be considered early, particularly in sustained-release ingestions or co-ingestants.
Calcium therapy provides transient improvement. Calcium gluconate is preferred due to reduced tissue toxicity, while calcium chloride is more potent but risks extravasation injury. Calcium is contraindicated in digoxin toxicity. IV fluids should be administered cautiously. Atropine is usually ineffective.
High-dose insulin euglycemia therapy is a cornerstone of treatment, improving myocardial carbohydrate utilization and hemodynamics. Vasopressors such as dopamine, epinephrine, or norepinephrine may be required. Amrinone may improve inotropy. Electrical pacing is reserved for refractory cases. IV lipid emulsion and hypertonic sodium bicarbonate may be considered as rescue therapies.
Disposition and Follow-Up
Patients with symptoms or sustained-release ingestion require admission to a monitored setting. Asymptomatic patients who ingest immediate-release formulations may be discharged after 8 hours of observation. Psychiatric evaluation is required for intentional overdoses. Caregiver education is essential for pediatric exposures
Clinical Pearls and Pitfalls
Consider CCB toxicity in any patient presenting with unexplained hypotension, bradycardia, and hyperglycemia. Do not rely on atropine alone. Early initiation of high-dose insulin therapy improves outcomes. Sustained-release preparations may cause delayed and prolonged toxicity.
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Emergency and Acute Medicine – Bursitis
Overview And Definitions
Bursae are synovial fluid–filled sacs, approximately 150 in number, located between bones, tendons, ligaments, muscles, and skin, where they function to reduce friction during movement. Bursitis refers to inflammation of a bursa and may result from acute trauma, repetitive overuse, infection, crystal deposition, or systemic inflammatory disease. Chronic inflammation can lead to proliferative thickening of the bursal wall. Frequently involved locations include the subacromial bursa of the shoulder, the olecranon bursa of the elbow, trochanteric and iliopsoas bursae of the hip, prepatellar and pes anserine bursae of the knee, and the calcaneal bursa of the foot, often related to footwear.
Etiology And Pathophysiology
Trauma and repetitive microtrauma are the most common causes, either from a single injury or chronic pressure and overuse. Infectious bursitis usually results from direct inoculation through skin disruption, sometimes microscopic, and is more common in patients with diabetes, chronic alcohol use, uremia, gout, or immunosuppression. Staphylococcus species account for the majority of septic cases. Crystal-induced inflammation may occur from calcium phosphate or monosodium urate deposition. Systemic inflammatory disorders such as rheumatoid arthritis, gout, ankylosing spondylitis, psoriatic arthritis, lupus, and rheumatic fever may also precipitate bursitis.
Clinical Features
Patients may present with acute or chronic symptoms. Pain is typically localized and worsened by joint movement or direct pressure. Functional complaints such as limping or activity limitation are common. Localized swelling is often evident, especially in superficial bursae. In aseptic bursitis, tenderness is usually mild, with reduced active range of motion but preserved passive motion. Septic bursitis is suggested by warmth, erythema, swelling, marked tenderness, and sometimes fever. A history of gout, pseudogout, rheumatologic disease, recent procedures, injections, or aspirations involving the bursa should be elicited.
Evaluation And Diagnostic Approach
A careful examination of adjacent joints, tendons, and soft tissues is essential. Any suspicion of infection warrants diagnostic aspiration, particularly for olecranon and prepatellar bursae, using a lateral approach to avoid needle tract complications. Deep bursae such as the hip may require ultrasound guidance or specialist involvement.
Laboratory evaluation may include CBC with differential when infection is suspected and targeted tests for systemic disease such as uric acid, ESR, or CRP. Aspirated bursal fluid should be analyzed for cell count with differential, glucose, protein, crystals, Gram stain, and culture, with cultures sent in all cases. Imaging with plain radiographs may show soft tissue swelling, calcifications, or underlying arthropathy, particularly after trauma. Ultrasound, MRI, or CT may assist in evaluating deep or septic bursitis.
Differential Diagnosis
Conditions that may mimic bursitis include septic or inflammatory arthritis, osteoarthritis, gout and pseudogout, tendonitis, fasciitis, epicondylitis, fractures, ligament or tendon injury, contusion, osteomyelitis, and nerve entrapment. Hip pain may also arise from lumbar spine disease, sacroiliitis, or neuritis.
Management Principles
Initial care includes joint immobilization when pain is significant, with caution to avoid prolonged shoulder immobilization due to the risk of adhesive capsulitis.
Nonseptic bursitis is treated with rest, avoidance of aggravating activities, protective padding, ice therapy, and NSAIDs continued for several days beyond symptom resolution to reduce recurrence. Fluctuant bursae may be aspirated and compressed. If symptoms persist after infection is excluded, intrabursal corticosteroid injection combined with local anesthetic may be considered using strict sterile technique, with limits on frequency of injections.
Septic bursitis requires aspiration and appropriate antimicrobial therapy. Superficial infections may be managed with aspiration and oral antibiotics if close follow-up is ensured, while deeper or more severe infections may require drainage and IV antibiotics. Therapy should be guided by Gram stain results and local resistance patterns, with continued treatment beyond clinical resolution. Underlying conditions such as gout should be addressed concurrently.
Disposition And Follow-Up
Most patients can be managed as outpatients and improve within several days. Septic bursitis requires close follow-up and may necessitate repeated aspirations until cultures are sterile. Admission is indicated for systemic illness, extensive cellulitis, immunosuppression, inability to tolerate oral therapy, or failure of outpatient management. Referral to rheumatology or orthopedics is recommended for recurrent, refractory, or surgically managed cases.
Key Clinical Insights And Common Errors
Clinical examination alone may not reliably distinguish septic from nonseptic bursitis, making aspiration and fluid analysis critical. NSAID-related gastrointestinal bleeding and renal toxicity should be considered, particularly with ketorolac use. Although erythema, warmth, swelling, and pain strongly suggest infection, aspiration and culture remain essential. Care must be taken during aspiration to avoid introducing infection into adjacent joints.
Overview And Definitions
Bursae are synovial fluid–filled sacs, approximately 150 in number, located between bones, tendons, ligaments, muscles, and skin, where they function to reduce friction during movement. Bursitis refers to inflammation of a bursa and may result from acute trauma, repetitive overuse, infection, crystal deposition, or systemic inflammatory disease. Chronic inflammation can lead to proliferative thickening of the bursal wall. Frequently involved locations include the subacromial bursa of the shoulder, the olecranon bursa of the elbow, trochanteric and iliopsoas bursae of the hip, prepatellar and pes anserine bursae of the knee, and the calcaneal bursa of the foot, often related to footwear.
Etiology And Pathophysiology
Trauma and repetitive microtrauma are the most common causes, either from a single injury or chronic pressure and overuse. Infectious bursitis usually results from direct inoculation through skin disruption, sometimes microscopic, and is more common in patients with diabetes, chronic alcohol use, uremia, gout, or immunosuppression. Staphylococcus species account for the majority of septic cases. Crystal-induced inflammation may occur from calcium phosphate or monosodium urate deposition. Systemic inflammatory disorders such as rheumatoid arthritis, gout, ankylosing spondylitis, psoriatic arthritis, lupus, and rheumatic fever may also precipitate bursitis.
Clinical Features
Patients may present with acute or chronic symptoms. Pain is typically localized and worsened by joint movement or direct pressure. Functional complaints such as limping or activity limitation are common. Localized swelling is often evident, especially in superficial bursae. In aseptic bursitis, tenderness is usually mild, with reduced active range of motion but preserved passive motion. Septic bursitis is suggested by warmth, erythema, swelling, marked tenderness, and sometimes fever. A history of gout, pseudogout, rheumatologic disease, recent procedures, injections, or aspirations involving the bursa should be elicited.
Evaluation And Diagnostic Approach
A careful examination of adjacent joints, tendons, and soft tissues is essential. Any suspicion of infection warrants diagnostic aspiration, particularly for olecranon and prepatellar bursae, using a lateral approach to avoid needle tract complications. Deep bursae such as the hip may require ultrasound guidance or specialist involvement.
Laboratory evaluation may include CBC with differential when infection is suspected and targeted tests for systemic disease such as uric acid, ESR, or CRP. Aspirated bursal fluid should be analyzed for cell count with differential, glucose, protein, crystals, Gram stain, and culture, with cultures sent in all cases. Imaging with plain radiographs may show soft tissue swelling, calcifications, or underlying arthropathy, particularly after trauma. Ultrasound, MRI, or CT may assist in evaluating deep or septic bursitis.
Differential Diagnosis
Conditions that may mimic bursitis include septic or inflammatory arthritis, osteoarthritis, gout and pseudogout, tendonitis, fasciitis, epicondylitis, fractures, ligament or tendon injury, contusion, osteomyelitis, and nerve entrapment. Hip pain may also arise from lumbar spine disease, sacroiliitis, or neuritis.
Management Principles
Initial care includes joint immobilization when pain is significant, with caution to avoid prolonged shoulder immobilization due to the risk of adhesive capsulitis.
Nonseptic bursitis is treated with rest, avoidance of aggravating activities, protective padding, ice therapy, and NSAIDs continued for several days beyond symptom resolution to reduce recurrence. Fluctuant bursae may be aspirated and compressed. If symptoms persist after infection is excluded, intrabursal corticosteroid injection combined with local anesthetic may be considered using strict sterile technique, with limits on frequency of injections.
Septic bursitis requires aspiration and appropriate antimicrobial therapy. Superficial infections may be managed with aspiration and oral antibiotics if close follow-up is ensured, while deeper or more severe infections may require drainage and IV antibiotics. Therapy should be guided by Gram stain results and local resistance patterns, with continued treatment beyond clinical resolution. Underlying conditions such as gout should be addressed concurrently.
Disposition And Follow-Up
Most patients can be managed as outpatients and improve within several days. Septic bursitis requires close follow-up and may necessitate repeated aspirations until cultures are sterile. Admission is indicated for systemic illness, extensive cellulitis, immunosuppression, inability to tolerate oral therapy, or failure of outpatient management. Referral to rheumatology or orthopedics is recommended for recurrent, refractory, or surgically managed cases.
Key Clinical Insights And Common Errors
Clinical examination alone may not reliably distinguish septic from nonseptic bursitis, making aspiration and fluid analysis critical. NSAID-related gastrointestinal bleeding and renal toxicity should be considered, particularly with ketorolac use. Although erythema, warmth, swelling, and pain strongly suggest infection, aspiration and culture remain essential. Care must be taken during aspiration to avoid introducing infection into adjacent joints.
