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Emergency and Acute Medicine – Neck Injury by Strangulation/Hanging
Neck injury from strangulation can occur through ligature strangulation (a material compressing the neck), manual strangulation (direct pressure using hands), or postural strangulation (airway obstruction from body weight over an object or positioning, most often in infants). Hanging is a form of strangulation and may be complete (judicial type), where the entire body is suspended, or incomplete (nonjudicial), where part of the body remains in contact with the ground. Typical hanging places the suspension point centrally over the occiput, while atypical hanging places it elsewhere. These events may be intentional (suicide, homicide, autoerotic activity, or “the choking game”) or accidental, especially in children. Near-hanging refers to survival following nonjudicial hanging.
In judicial hanging, the victim is dropped a distance at least equal to their height, producing forceful distraction of the head from the torso. This can cause severe cervical spine fracture and spinal cord transection. In nonjudicial hanging, the fall is usually from a lower height and injuries resemble those seen in strangulation. In strangulation, external neck pressure leads to cerebral hypoxia due to venous and arterial obstruction, and may also injure airway structures, soft tissues, and neck vessels. Cervical spine injuries are uncommon except with judicial-type hanging. Death may occur from mechanical closure of the airway or blood vessels, cardiac arrest caused by extreme bradycardia from carotid sinus stimulation, direct spinal cord injury, pulmonary complications in near-hanging victims, or cerebral hypoxia.
Commonly associated conditions include cervical spine injury, hypoxic brain injury, arterial or venous dissection or thrombosis, hyoid bone fracture (typically in nonjudicial strangulation), cricoid cartilage disruption (rare), and thyroid cartilage disruption (more common in nonjudicial strangulation deaths). Other complications include phrenic nerve injury, airway edema, aspiration pneumonitis (often delayed), neurogenic pulmonary edema (delayed, due to massive sympathetic discharge), postobstructive pulmonary edema (which may develop rapidly), and possible air embolism when subcutaneous air and vascular injury are present.
Symptoms and signs may involve multiple systems. Airway disruption can present with subcutaneous emphysema, dyspnea, dysphonia or stridor, and loss of normal neck cartilage landmarks. Cervical spine injury can cause respiratory arrest or paralysis. Neurologic injury may present with hoarseness, dysphagia, altered mental status, or focal neurologic deficits. Pulmonary sequelae can include respiratory distress, pulmonary edema, ARDS, or pneumonia. Soft tissue findings may include abrasions, contusions, ecchymoses, and ligature or hand marks. Vascular injuries may present with an expanding hematoma, pulse deficits, bruits, or evidence of cerebral infarction. Petechial hemorrhages above the ligature mark (Tardieu spots) may be seen on the skin, mucous membranes, or conjunctiva. In children, neck structures are more cartilaginous and mobile, making fractures less common, but airway compromise can occur quickly with relatively little edema because of the smaller airway diameter.
History should focus on the strangulation method and patient position to help predict injury patterns. A higher fall implies greater force and raises concern for decapitation-type injury. Knot position affects injury risk, with arterial occlusion more likely in typical hanging. Ligature material matters because elastic materials may limit peak force but venous obstruction can still cause unconsciousness and death. Circumstances should be clarified, including accidental injury, suicide/homicide, nonaccidental trauma, sexual context, or “choking game.” Physical examination should begin with ABCs and strict cervical spine precautions, followed by neurologic assessment for coma, altered mental status, paralysis, or focal deficits. A secondary survey should look for soft tissue injury, aero-digestive injury, and vascular trauma, as well as other trauma from falls, self-inflicted injuries, or assault.
Essential workup includes CT of the cervical spine through T1, CT of the head to assess for hemorrhage, edema, hematoma, subarachnoid hemorrhage, or hypoxic injury, and CT angiography of the neck to evaluate for thrombosis or intimal dissection. A chest radiograph helps detect subcutaneous emphysema, aspiration pneumonitis, and pulmonary edema. Continuous pulse oximetry and cardiac monitoring are required. Additional testing may include an ABG if respiratory compromise is suspected, hematocrit if significant blood loss is possible, type and cross-match if vascular injury is suspected, and coagulation studies for bleeding risk. Toxicology testing may be appropriate when intentional self-harm is suspected. MRI of the neck can be more sensitive than CT for soft tissue and cartilaginous injury, and arteriography remains a definitive test for vascular injury. Fiberoptic endoscopy can directly evaluate aero-digestive injury and may help with intubation decisions, while surgical exploration is reserved for indicated cases.
Prehospital care prioritizes rapid airway management with oxygen, suction, and intubation when indicated, while removing any ligature and maintaining cervical spine stabilization. In the emergency department, aggressive airway management with cervical spine precautions remains the priority, with early intubation for respiratory compromise and supplemental oxygen. Cricothyrotomy or tracheostomy may be required in severe facial trauma, but cricothyrotomy should be avoided if there is hematoma over the cricothyroid membrane or suspected cricotracheal disruption; emergent tracheostomy is preferred in that scenario. Bleeding should be controlled with direct pressure and the neck should not be explored in the ED.
Emergency treatment includes establishing IV access and consulting appropriate specialists: otolaryngology or trauma surgery for soft tissue and airway injuries, vascular surgery for suspected vascular injury, neurology for suspected ischemic insult, and neurosurgery if intracranial pressure monitoring or intervention is needed. Supportive care for suspected cerebral edema includes elevating the head of bed, maintaining oxygenation and cerebral perfusion, and preventing secondary neurologic injury. If subcutaneous emphysema is present, assume upper airway mucosal disruption communicating with deep tissues and administer antibiotics. Steroids may be considered for airway edema. Clinicians should also evaluate for associated harm such as co-ingestions in suicidal cases and must report suspected nonaccidental trauma in children.
Medications may include mannitol or hypertonic saline in selected cases of elevated intracranial pressure, and phenytoin for seizures when needed. For neck injury with subcutaneous emphysema, antibiotics such as ampicillin/sulbactam or clindamycin may be used. For airway edema, dexamethasone may be considered, with dosing adjusted for pediatric patients.
Disposition is typically admission to a monitored setting for all strangulation or hanging-mechanism injuries due to the risk of delayed airway compromise, pulmonary edema, or neurologic deterioration. Admission is required for altered consciousness, new neurologic deficits, coma, respiratory distress, or injuries requiring surgical correction, including laryngeal, esophageal, or vascular injuries. All suspected suicidal or homicidal cases require psychiatric or social work consultation, and pediatric cases with suspected nonaccidental trauma require safety evaluation. Discharge is appropriate only for patients without strangulation or hanging injuries after adequate ED observation confirms no airway compromise, vascular injury, neurologic deficit, or suicidal/homicidal risk.
Follow-up recommendations include neuropsychiatric evaluation when hypoxic encephalopathy is a concern, psychiatric follow-up for suicidal or homicidal patients, behavioral therapy for autoerotic or “choking game” cases, and surgical follow-up as indicated by the injuries. Key pitfalls include failing to recognize delayed airway or pulmonary complications, missing vascular injury or dissection, and underestimating severity in patients who initially appear stable. Cervical spine injury is uncommon in nonjudicial hanging, and cerebral hypoxia is the most common cause of death, so rapid airway control and full evaluation for associated injuries are essential.
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Emergency and Acute Medicine – Neck Trauma, Blunt, Anterior
Blunt anterior neck trauma can result in injury to multiple critical structures, including vascular, laryngotracheal, pharyngoesophageal, neurologic, and cervical spine components. Vascular injuries may involve the carotid or vertebral arteries and include intramural hematoma, intimal tear, thrombosis, pseudoaneurysm, hemorrhage, or expanding neck hematoma. Laryngotracheal injuries include fractures of the hyoid bone, thyroid or cricoid cartilage, cricotracheal separation, vocal cord disruption, arytenoid dislocation, and tracheal hematoma or transection. Pharyngoesophageal injuries may present as hematoma or perforation of the pharynx or esophagus. Neurologic injury can involve the thoracic sympathetic chain causing Horner syndrome, the vagus or recurrent laryngeal nerves, cervical nerve roots, or spinal cord. Cervical spine fractures or dislocations may also be present.
The most common etiology is motor vehicle collisions, particularly frontal impacts in unrestrained occupants striking the dashboard or steering wheel (“padded dash syndrome”), or from shoulder harness–related shearing injury. Other causes include assault with blows to the anterior neck, “clothesline injuries” from motorcycles or recreational vehicles striking suspended wires or cords, and strangulation. In children, the proportionally larger head increases risk for acceleration–deceleration injury, and intraoral trauma to the soft palate may lead to carotid artery thrombosis.
Clinical presentation varies by injured structure. Vascular injury may cause hemorrhage, ecchymosis, edema, carotid bruit or thrill (highly suggestive of vascular injury), and delayed neurologic deficits. Laryngotracheal injury may present with hoarseness, aphonia, dyspnea, inspiratory stridor, labored breathing, air hunger, subcutaneous emphysema, and anterior neck tenderness. Pharyngoesophageal injury may cause dysphagia, odynophagia, hematemesis, blood in saliva, and delayed infection or sepsis. Neurologic injury may manifest as central or peripheral deficits. History should focus on mechanism, force, associated symptoms, and injuries beyond the neck, as blunt neck trauma is commonly associated with head and chest injuries.
Physical examination must prioritize airway protection and patency. The neck should be inspected for hemorrhage, hematoma, ecchymosis, edema, and anatomic distortion, auscultated for carotid bruits or stridor, and palpated for tenderness or subcutaneous emphysema. A complete neurologic examination is essential to detect ischemic events, spinal cord injury, or peripheral nerve damage, along with a full trauma examination for associated injuries.
Workup depends on clinical findings. Laboratory studies may include type and cross-match, CBC, and renal function prior to contrast imaging. Cervical spine and lateral neck radiographs have limited value but may show prevertebral swelling, subglottic narrowing, subcutaneous air, or calcified cartilage fractures. Chest radiograph is useful for detecting pneumothorax or pneumomediastinum. Carotid duplex ultrasonography is a rapid, noninvasive screening tool but is operator dependent and limited above the bifurcation. CT is useful in stable patients to evaluate laryngotracheal injury, cartilage disruption, and cervical spine trauma. CT angiography and magnetic resonance angiography have high specificity but limited sensitivity; four-vessel angiography remains the gold standard for arterial injury evaluation. Indications for angiography include carotid bruit, expanding neck hematoma, neurologic deficit with normal head CT, Horner syndrome, or decreased level of consciousness. Fiberoptic laryngoscopy can assess airway injury and assist with intubation, while suspected esophageal injury should be evaluated initially with a contrast swallow study. Unstable patients require immediate surgical intervention.
Prehospital and initial management focus on vigilant airway monitoring, as edema or hematoma may rapidly compromise the airway. Orotracheal intubation is preferred, while blind nasotracheal intubation should be avoided due to distorted anatomy and risk of hematoma rupture. Cervical spine stabilization is mandatory. Immediate airway control is indicated for respiratory distress, stridor, air hunger, or expanding neck hematoma. Cricothyrotomy or emergent tracheostomy may be required if intubation fails, but is contraindicated when bruising or hematoma overlies the thyroid or cricoid cartilage. Unstable patients should proceed directly to the operating room.
Emergency department management requires early surgical consultation for suspected vascular, tracheal, or esophageal injuries, with immediate repair for symptomatic vascular, tracheal, pharyngeal, or esophageal injuries. Laryngeal injuries may not always require immediate surgery. Anticoagulation is often recommended for vascular injuries to reduce thrombosis and improve neurologic outcomes, but only after surgical consultation. Prophylactic antibiotics with anaerobic coverage are indicated when esophageal injury is present.
Patients who are symptomatic, have abnormal imaging, or sustained significant blunt mechanisms require admission and observation for at least 24 hours, with ICU admission for suspected airway or vascular injury. Patients on anticoagulation should be observed for delayed neck hematoma. Only those with trivial injury and negative evaluation may be discharged with strict return precautions for delayed airway, vascular, or neurologic symptoms. Key pitfalls include underestimating delayed vascular injury, failing to anticipate a difficult airway, and missing associated injuries; preparation for airway deterioration and early specialty involvement are essential.
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Emergency and Acute Medicine – Neck Trauma, Penetrating, Anterior
Penetrating anterior neck trauma is a high-risk injury because of the density of vital vascular, aerodigestive, and neurologic structures within a small anatomic space. Wound severity is determined by violation of the platysma muscle; penetration beyond the platysma signifies a true penetrating neck injury and mandates further evaluation. For clinical assessment and management, the neck is anatomically divided into three zones. Zone I, extending from the clavicles to the cricoid cartilage, contains major vessels, lungs, trachea, esophagus, and thyroid, and injuries here carry the highest mortality due to potential thoracic involvement. Zone II, between the cricoid cartilage and the angle of the mandible, contains major vessels, trachea, esophagus, cervical spine, and spinal cord and is the most commonly injured zone due to its exposure. Zone III, from the angle of the mandible to the base of the skull, is difficult to access surgically and often requires specialized imaging. In children, the larynx is positioned higher and is relatively better protected by the mandible and hyoid bone.
The most common etiologies include gunshot wounds, stab wounds, and miscellaneous causes such as glass shards, metal fragments, or animal bites. Clinical manifestations depend on the structures involved. Vascular injury may present with active or persistent hemorrhage, expanding hematoma, pulse deficit, vascular bruit or thrill, Horner syndrome suggestive of carotid injury, or venous air embolism. Aerodigestive injury can cause respiratory distress, stridor, hemoptysis, tracheal deviation, subcutaneous emphysema, pneumothorax, hoarseness, aphonia, dysphonia, dysphagia, or odynophagia. Neurologic involvement may result in central or peripheral nervous system deficits. Historical features increasing concern include wounds crossing the midline, characteristics of the penetrating object, and whether a gunshot wound occurred at close range.
Physical examination must focus on airway patency and hemodynamic stability. Careful inspection is required to determine whether the platysma has been violated. Wounds should never be blindly probed, as this may precipitate catastrophic hemorrhage. If the platysma is not violated, local wound care and discharge may be appropriate. If platysma violation is present, management depends on patient stability and the involved zone. Unstable patients require immediate airway control and operative intervention. Stable patients undergo targeted diagnostic evaluation based on zone involvement.
Laboratory studies typically include type and cross-match, complete blood count, metabolic panel, and coagulation studies. Imaging begins with lateral neck and chest radiographs to identify foreign bodies, soft tissue injury, pneumothorax, or mediastinal air. In Zone I injuries, angiography remains the gold standard for vascular assessment, although CT angiography is frequently used due to speed and noninvasiveness, with the understanding that visualization of subclavian vessels may be limited. Esophageal injury evaluation requires a water-soluble contrast esophagram or dilute barium study, often combined with esophagoscopy, particularly when the wound approaches or crosses the midline or when subcutaneous air is present. Zone II injuries may be observed if asymptomatic, whereas symptomatic patients typically require surgical exploration. Zone III injuries generally require angiography or CT angiography if symptomatic. Bronchoscopy is useful for suspected tracheal injury. Surgical consultation is required for all penetrating neck wounds that violate the platysma, and immediate exploration is indicated for expanding or pulsatile hematoma, active bleeding, hemoptysis, bruit, subcutaneous emphysema, respiratory distress, air bubbling through the wound, Horner syndrome, or absent peripheral pulses.
Prehospital and early emergency department management prioritize airway protection and hemorrhage control. Frequent suctioning may be necessary to clear blood or secretions, and high-flow oxygen should be administered. Bag-valve-mask ventilation should be avoided if possible because it may force air through laryngotracheal injuries into surrounding tissues. Early orotracheal intubation is indicated for respiratory distress, stridor, air hunger, labored breathing, or expanding neck hematoma. Occlusive dressings should be applied over venous injuries to prevent air embolism. Routine cervical spine immobilization is not indicated in the absence of focal neurologic deficits, as it may obscure critical neck findings.
Definitive airway management typically involves rapid-sequence orotracheal intubation. Fiberoptic intubation is advantageous in stable patients because it allows direct visualization of airway injury. Blind nasotracheal intubation is contraindicated in the presence of airway distortion, apnea, or severe facial trauma. Percutaneous transtracheal ventilation may be considered when other methods fail but is contraindicated in upper airway obstruction. Cricothyroidotomy should be avoided if a hematoma overlies the cricothyroid membrane; tracheostomy is preferred in such cases. External hemorrhage should be controlled with direct pressure, and if unsuccessful, a Foley catheter balloon may be inserted into the wound to tamponade bleeding. Blind clamping of vessels is contraindicated. Uncontrolled bleeding or hemodynamic instability necessitates immediate transfer to the operating room. Prophylactic antibiotics and tetanus prophylaxis are recommended, and nasogastric tube placement should be avoided due to the risk of disrupting pharyngeal hematomas.
All patients with penetrating neck trauma require hospital admission and observation for at least 24 hours in a facility capable of definitive surgical care. Patients with suspected airway or vascular injury should be admitted to the intensive care unit. Asymptomatic patients with negative evaluations may be discharged after observation, while those with wounds superficial to the platysma may be discharged directly from the emergency department. Common pitfalls include failure to anticipate a difficult airway and failure to recognize impending airway compromise, both of which can lead to rapid deterioration if not addressed promptly.
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Emergency and Acute Medicine – Necrotizing Soft Tissue Infections
Necrotizing soft tissue infections (NSTIs) are rapidly progressive infections involving any layer of the skin and underlying soft tissues, characterized by widespread necrosis, severe systemic toxicity, and a high mortality rate. These infections spread quickly along tissue planes, often causing extensive fascial and muscle destruction with relative sparing of the skin in early stages. Clinical entities within this spectrum include necrotizing fasciitis, Fournier gangrene, clostridial and nonclostridial myonecrosis, crepitant anaerobic cellulitis, and progressive bacterial gangrene. Despite being uncommon, NSTIs carry mortality rates of 24–34% and are associated with significant morbidity such as amputations, renal failure, and prolonged critical illness.
NSTIs typically arise in the setting of local tissue trauma, ischemia, or impaired host defenses. Risk is increased in older adults, smokers, and patients with chronic systemic disease including diabetes mellitus, obesity, peripheral vascular disease, chronic kidney disease, alcohol abuse, immunosuppression, and intravenous drug use. Type I NSTIs, which account for approximately 80% of cases, are polymicrobial infections involving aerobic and anaerobic organisms and commonly occur after surgery or in patients with chronic illness. Type II NSTIs are usually monomicrobial, most often caused by group A β-hemolytic streptococcus, and can affect young, otherwise healthy individuals; these infections are the classic “flesh-eating” disease. Type III NSTIs are rare but fulminant, frequently clostridial in origin, and often follow penetrating trauma, crush injuries, or injection drug use. Pediatric cases are uncommon but may occur in neonates after omphalitis or circumcision, or in children following recent varicella infection, surgery, or in those with immunodeficiency.
The clinical presentation can be subtle early but deteriorates rapidly. Patients often report fever, malaise, altered mental status, and severe pain at the affected site. A hallmark feature is pain that is disproportionate to physical findings. Within the first 24 hours, localized swelling, warmth, erythema, and tenderness develop, followed over the next 24–48 hours by skin discoloration (purple or blue), hemorrhagic bullae, and foul-smelling, thin drainage due to necrosis of fascia and fat. Systemic toxicity is common and includes tachycardia, tachypnea, hypotension, fever, and mental status changes. Crepitus, while pathognomonic, is present in only a minority of cases. In children, localized pain and rash are the most common presenting features, while hypotension and shock are less frequent early findings.
Diagnosis is challenging and relies heavily on clinical suspicion, particularly in high-risk patients who appear severely ill or have pain out of proportion to examination findings. Laboratory abnormalities may include leukocytosis, electrolyte derangements, renal dysfunction, hypocalcemia from fat necrosis, and evidence of disseminated intravascular coagulation. Imaging studies such as plain radiographs, CT, MRI, or ultrasound may demonstrate soft tissue gas, fascial thickening, or fluid along fascial planes, but absence of these findings does not exclude NSTI. Importantly, imaging should never delay surgical intervention. Definitive diagnosis is established by surgical exploration with deep tissue biopsy and cultures, which remains the gold standard.
Management of NSTIs is a true surgical emergency. Initial stabilization focuses on airway protection, aggressive fluid resuscitation, oxygenation, and correction of metabolic disturbances. Broad-spectrum intravenous antibiotics must be initiated immediately, targeting aerobic gram-positive and gram-negative organisms, anaerobes, and methicillin-resistant Staphylococcus aureus until culture results are available. Clindamycin should be started early, particularly when group A streptococcal infection is suspected, due to its ability to suppress toxin production. However, antimicrobial therapy alone is insufficient; early and aggressive surgical debridement of all necrotic tissue with fasciotomy and drainage is the cornerstone of treatment and must not be delayed. Adjunctive therapies such as hyperbaric oxygen and intravenous immunoglobulin may be considered in select cases, though their roles remain controversial.
All patients with NSTI require hospital admission, typically to an intensive care setting, for ongoing surgical management, intravenous antibiotics, and close monitoring for complications such as acute respiratory distress syndrome, renal failure, myocardial dysfunction, and disseminated intravascular coagulation. No patient with NSTI is appropriate for discharge. Key clinical pearls include maintaining a high index of suspicion, recognizing pain out of proportion to examination as a critical clue, and understanding that mortality approaches 100% if treatment is limited to antibiotics without prompt surgical debridement.
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Emergency and Acute Medicine – Necrotizing Ulcerative Gingivitis
Necrotizing ulcerative gingivitis (NUG) is an acute periodontal disease characterized by painful ulceration and necrosis of the gingival papillae, producing the classic “punched-out” appearance. It is also known as acute necrotizing ulcerative gingivitis, trench mouth, Vincent disease, or fusospirochetal gingivitis. The condition is not contagious and most commonly affects children and young adults, particularly in developing regions such as sub-Saharan Africa. In developed countries it is rare and is typically seen in severely immunocompromised individuals. Males are affected more often than females. If untreated, NUG can progress to more severe disease, including necrotizing stomatitis, necrotizing ulcerative periodontitis with alveolar bone involvement, or orofacial gangrene (noma).
The disease is caused by an overgrowth of normal oral flora, most notably Prevotella intermedia and spirochetes. While predisposing factors are not required for diagnosis, they are commonly present and include poor oral hygiene, gingivitis, malnutrition, smoking, emotional or physical stress, and immunodeficiency states such as HIV infection or other causes of immunosuppression. There is also a possible association with direct exposure to certain chemicals, including recreational drugs such as MDMA (ecstasy).
Clinically, NUG presents with acute onset of severe oral pain and bleeding gums that may occur spontaneously or with minimal manipulation. The hallmark finding on physical examination is loss of the interdental papillae, resulting in crater-like, “punched-out” ulcers that bleed easily. Necrotic debris often overlies the ulcerated areas, forming a grayish pseudomembrane that, when removed, reveals a bleeding surface. Patients frequently complain of foul breath and may have associated low-grade fever, malaise, and submandibular lymphadenopathy.
The diagnosis of necrotizing ulcerative gingivitis is primarily clinical, as laboratory tests and imaging studies are generally not helpful. Evaluation should focus on identifying underlying systemic disease, particularly immunosuppression, neutropenia, or HIV infection. It is also essential to assess for complications such as extension of lesions into the periodontal ligament and alveolar bone, progression to necrotizing stomatitis, or development of orofacial gangrene, which carries a high mortality rate if untreated.
Initial management focuses on supportive care and symptom relief. Dehydrated patients may require intravenous fluids. Pain control is achieved with topical agents such as viscous lidocaine and systemic analgesics, with narcotics rarely required. Gentle debridement of the pseudomembrane using gauze or a cotton-tipped applicator soaked in diluted hydrogen peroxide helps reduce bacterial load and improve healing. Antibiotic therapy is indicated in patients with fever, lymphadenopathy, or systemic symptoms, and in those who are immunocompromised. Common regimens include penicillin with metronidazole or clindamycin as an alternative.
Outpatient therapy is central to recovery and includes chlorhexidine gluconate mouth rinses, diluted hydrogen peroxide rinses, avoidance of oral irritants such as spicy foods and hot beverages, and reinforcement of good oral hygiene with gentle brushing and flossing. Nonsteroidal anti-inflammatory drugs or acetaminophen are usually sufficient for pain control. More extensive antimicrobial coverage, including antifungal or antiviral therapy, may be required in severely immunosuppressed patients.
Hospital admission is reserved for patients with extensive disease, significant systemic symptoms, severe dehydration with inability to tolerate oral intake, or evidence of progression to orofacial gangrene. Most patients who can maintain hydration and have no signs of advanced disease may be safely discharged with close follow-up. All patients require urgent referral to a dentist or periodontist for definitive care, including deep scaling and debridement.
Key clinical pearls include maintaining a high index of suspicion for underlying immunosuppression, particularly HIV infection, and recognizing that necrotizing ulcerative gingivitis can progress rapidly if left untreated. Early identification and prompt intervention are essential to prevent serious and potentially life-threatening complications.
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KembaraXtra-Emergency and Acute Medicine - Osteomyelitis
Description: Osteomyelitis is an infection of bone characterized by ongoing inflammatory destruction. It is most commonly bacterial in origin, although fungal osteomyelitis can occur, particularly in immunocompromised patients. The disease may present as acute, subacute, or chronic infection, with chronic cases defined by persistence or recurrence and the presence of necrotic bone (sequestrum).
Etiology: Hematogenous osteomyelitis occurs when bacteria seed bone via the bloodstream and is most common in children, the elderly, and people who inject drugs. Children typically develop acute disease, often without a preceding illness, though up to one-third report recent trauma. Adults more often develop subacute or chronic disease. Staphylococcus aureus is the most common pathogen across all age groups. Neonates are additionally affected by Enterobacteriaceae, group A and B streptococci, and Escherichia coli. Children may also develop infection from Haemophilus influenzae, while Salmonella is classically associated with sickle cell disease. Adults may have infections caused by gram-negative rods, Pseudomonas, Staphylococcus epidermidis, and anaerobes. Vertebral osteomyelitis is uncommon but typically affects adults over 45 years, often in the setting of diabetes, malignancy, hemodialysis, long-term catheterization, or IV drug use, and may extend to cause epidural abscesses or deep paraspinal collections. Direct or contiguous osteomyelitis occurs following trauma, open fractures, surgery, or spread from adjacent soft tissue infection and is more common in adults and adolescents. Chronic osteomyelitis is associated with necrotic bone and commonly involves S. aureus, S. epidermidis, Pseudomonas aeruginosa, and gram-negative organisms.
Clinical features: Symptoms vary with disease duration. Patients often present with localized, deep, dull, or throbbing bone pain that may occur at rest or with movement. Fever and chills may be present in acute disease but are often absent in chronic infection. Other features include malaise, nausea, vomiting, reluctance to use an affected limb, nonhealing ulcers, or fracture nonunion. Risk factors include diabetes mellitus, vascular disease, IV drug use, trauma, and invasive procedures. Examination may reveal localized warmth, erythema, edema, tenderness, decreased range of motion, sinus tract drainage, or exposed bone. Deep ulcers with palpable bone and a positive “probe-to-bone” test strongly suggest osteomyelitis.
Evaluation: Initial workup includes complete blood count, erythrocyte sedimentation rate, C-reactive protein, plain radiographs, and blood and wound cultures. Leukocytosis may be absent, but inflammatory markers are usually elevated. Blood cultures are positive in approximately half of cases. Plain radiographs are often normal in the first two to three weeks; early findings include periosteal elevation, followed by cortical erosion and new bone formation. MRI is the imaging modality of choice, with high sensitivity and specificity, allowing early detection and assessment of marrow, cortical, and soft tissue involvement. CT is useful when MRI is contraindicated and for surgical planning. Bone scans and leukocyte scintigraphy may be helpful in selected cases, while ultrasound is increasingly useful in children. Definitive diagnosis is established by bone biopsy with histology and culture, which remains the gold standard.
Management: Initial management focuses on stabilization, particularly in septic patients or those with neurologic deficits from spinal involvement. Empiric intravenous antibiotics should be started after cultures are obtained, then tailored based on organism and sensitivities. Treatment typically requires four to six weeks of parenteral antibiotics, with shorter IV courses followed by oral therapy possible in selected pediatric cases. Orthopedic and infectious disease consultation is essential, and surgical intervention is often required for debridement of necrotic bone, infected hardware, or abscesses.
Disposition and follow-up: Patients with acute osteomyelitis should be admitted for intravenous antibiotics and monitoring. Chronic osteomyelitis often requires admission for surgical management and prolonged therapy. Selected subacute or chronic cases may be managed as outpatients if debridement has been performed, cultures obtained, and reliable home IV antibiotic therapy is available. Close follow-up is mandatory to monitor response and prevent recurrence.
Key points: A normal white blood cell count does not exclude osteomyelitis. Early radiographs may be normal, making MRI critical for early diagnosis. Wound cultures alone are often unreliable for guiding therapy, and bone biopsy provides the most accurate microbiologic diagnosis.
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Emergency and Acute Medicine – Needlestick Injury
Needlestick and other sharps injuries are a common occupational hazard in healthcare and emergency settings, resulting in potential exposure to blood or body fluids. Exposure can occur through percutaneous injury, mucous membrane contact, or contact with nonintact skin. Prevention remains the cornerstone of management and includes strict adherence to universal precautions, avoidance of needle recapping, consistent glove use (with double gloving when appropriate), and compliance with body–substance isolation protocols. Wearing gloves can reduce the volume of blood exposure by approximately 50%, and hepatitis B vaccination is a critical preventive strategy for all at-risk personnel.
The risk of infection following a single needlestick exposure depends on the pathogen involved, characteristics of the exposure, and host factors. Without prior immunization, the risk of hepatitis B virus (HBV) transmission ranges from 37–62% when the source is HBsAg- and HBeAg-positive, and 23–37% when the source is HBsAg-positive but HBeAg-negative. The risk of hepatitis C virus (HCV) transmission is approximately 1.8%. HIV transmission risk is lower, estimated at 0.3% for percutaneous exposure and 0.09% for mucous membrane exposure. Infectivity also varies by body fluid, with plasma and serum carrying the highest viral concentrations and fluids such as urine, saliva, tears, and vaginal secretions having much lower concentrations. Factors that influence transmission risk include viral load, depth of inoculation, type and size of needle, duration of contact, volume of injected material, portal of entry, host susceptibility, and the presence of protective barriers such as gloves.
Evaluation begins with a detailed history documenting the date, time, and circumstances of exposure, the type of body fluid involved, and information about the source patient if known. Immunization history, particularly hepatitis B vaccination status, must be reviewed. Women of childbearing potential who may require antiviral prophylaxis should undergo pregnancy testing. Baseline laboratory evaluation should ideally be coordinated through occupational health services and includes serologic testing for HIV, HBV, and HCV, along with alanine aminotransferase levels. Consent should be obtained from the source patient, when possible, for HIV, HBV, and HCV testing, including the use of rapid HIV testing when available.
Immediate management focuses on local wound care with copious washing and cleaning of the exposure site. Tetanus prophylaxis should be updated as indicated. Prompt referral to occupational health is preferred to ensure confidentiality and continuity of care; however, if unavailable, evaluation and initiation of postexposure prophylaxis (PEP) should occur in the emergency department without delay. Timely initiation of prophylactic therapy is critical, particularly for HIV exposure, where treatment is most effective when started as soon as possible and continued for 28 days.
HIV postexposure prophylaxis recommendations are guided by the severity of exposure and the HIV status and viral load of the source patient. Depending on these factors, either a basic two-drug regimen or an expanded regimen with three or more antiretroviral agents is recommended. Counseling is an essential component of care and includes advice on safer sex practices, avoidance of pregnancy, blood or tissue donation, and breastfeeding during the follow-up period.
Management of hepatitis B exposure depends on the vaccination and immune status of the exposed individual and the HBV status of the source. Options include no treatment for adequately immunized individuals with protective antibody titers, initiation of the hepatitis B vaccine series for unvaccinated individuals, and administration of hepatitis B immune globulin for high-risk exposures or known nonresponders. In contrast, there is no proven prophylaxis for hepatitis C exposure; immunoglobulin and antiviral agents have not demonstrated consistent benefit, though early identification and treatment of established infection may improve outcomes.
Needlestick injuries rarely require hospital admission and are typically managed on an outpatient basis with close follow-up through occupational medicine services. Clear discharge instructions and follow-up plans are essential to ensure adherence to prophylactic regimens, completion of vaccination series when indicated, and serial testing to monitor for seroconversion.
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KembaraXtra-Emergency and Acute Medicine - Optic Neuritis
Description: Optic neuritis is an inflammatory disorder of the optic nerve resulting in demyelination and acute optic nerve dysfunction. It is strongly associated with multiple sclerosis and is the presenting manifestation in approximately 15–20% of patients with MS. Inflammation may involve the optic disc (papillitis) or the retrobulbar portion of the optic nerve, where the funduscopic examination may initially appear normal. The long-term risk of developing clinically definite MS depends on MRI findings, with significantly higher risk in patients demonstrating multiple demyelinating lesions.
Etiology and risk factors: Most cases are idiopathic and self-limited, but 20–50% are associated with multiple sclerosis. Other causes include postviral inflammation following infections such as varicella, measles, mononucleosis, HSV, or VZV, typically occurring weeks after illness. Granulomatous and infectious causes include tuberculosis, syphilis, sarcoidosis, cryptococcosis, Lyme disease, and HIV-related infections. Drug-induced optic neuritis has been reported with amiodarone, ethambutol, and tamoxifen. Genetic predisposition is suggested by associations with HLA-A23, B7, and DR2 alleles.
Clinical features: Patients typically present with subacute vision loss developing over days, peaking within 1–2 weeks, most often unilateral in adults and bilateral in children. Retrobulbar pain, worsened by eye movement, is characteristic. Color vision, contrast sensitivity, and depth perception are disproportionately affected compared with visual acuity. An afferent pupillary defect is common in unilateral cases. Visual field testing often reveals a central scotoma. Funduscopic examination may show optic disc swelling or appear normal. Uhthoff phenomenon, transient worsening of vision with heat or exertion, may occur.
Evaluation: A detailed history should assess age, sex, onset and progression of visual loss, eye pain, prior neurologic symptoms, recent infections, drug exposure, and family history of MS. Physical examination requires a complete ophthalmologic and neurologic assessment including visual acuity, pupillary reflexes, color vision testing, visual fields, and dilated fundus examination. Blood pressure should be assessed to exclude hypertensive optic neuropathy.
Diagnostic testing: MRI of the brain and orbits with gadolinium is the imaging modality of choice and demonstrates optic nerve enhancement in the majority of acute cases while also stratifying future MS risk. CT is less sensitive and primarily used to exclude compressive lesions. Laboratory evaluation is guided by clinical suspicion and may include CBC, ESR, syphilis serology, Lyme testing, ANA, HIV testing, and tuberculosis screening. Chest radiography may assist in evaluating sarcoidosis or tuberculosis. Formal automated visual field testing is recommended for baseline assessment and follow-up.
Management: Early ophthalmology and neurology consultation is essential. High-dose IV corticosteroids followed by an oral taper are recommended for patients with severe visual loss or those with two or more demyelinating lesions on MRI, as this shortens recovery time and reduces short-term risk of MS progression. Oral corticosteroids alone should be avoided, as they increase recurrence risk. Treatment decisions should be individualized in patients with fewer MRI lesions.
Disposition and follow-up: Admission is indicated for bilateral vision loss, diagnostic uncertainty, or when IV steroid therapy is required. Patients with unilateral involvement, stable condition, and reliable follow-up may be discharged with urgent neurology and ophthalmology review. High-risk patients should be referred for disease-modifying therapy consideration. Prompt follow-up is mandatory, as MRI findings are the strongest predictor of future multiple sclerosis.
Key points: Space-occupying lesions must be excluded before diagnosing optic neuritis. Acute bilateral visual loss with headache or diplopia raises concern for alternative emergencies such as pituitary apoplexy. MRI is critical for prognostication, and management should be coordinated with specialists to align with current standards of care.
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KembaraXtra-Emergency and Acute Medicine - Organophosphate Poisoning
Description: Organophosphate poisoning results from irreversible inhibition of cholinesterase enzymes, particularly acetylcholinesterase, leading to accumulation of acetylcholine at central and peripheral synapses and subsequent cholinergic overdrive. Toxic effects involve muscarinic, nicotinic, and central nervous system pathways, which may overlap in presentation. Mortality is primarily due to respiratory failure caused by bronchorrhea, bronchoconstriction, respiratory muscle weakness, and central respiratory depression. In children, symptoms may be difficult to distinguish, and seizures occur more frequently than in adults.
Etiology: Exposure commonly occurs through agricultural insecticides or chemical nerve agents such as sarin, soman, tabun, and VX. These agents are rapidly absorbed through the lungs, gastrointestinal tract, skin, mucous membranes, and eyes, making even dermal exposure potentially life-threatening.
Clinical features: The classic presentation is the cholinergic toxidrome characterized by DUMBELS: diarrhea and diaphoresis, urination, miosis and muscle fasciculations, bradycardia with bronchorrhea and bronchospasm, emesis, lacrimation, and salivation. Mild exposure causes headache, dizziness, weakness, tremors, and anorexia. Moderate exposure leads to muscle fasciculations progressing to flaccid paralysis, respiratory muscle weakness, agitation, confusion, pinpoint pupils, nausea, vomiting, and excessive secretions. Severe exposure presents with seizures, coma, centrally mediated respiratory depression, bronchoconstriction, cyanosis, cardiac conduction abnormalities, profuse secretions, and urinary or fecal incontinence.
Evaluation: A focused history should assess occupational exposure, recent insecticide use, possible suicide attempt, and access to pesticides, with retrieval of the original container if available. Physical examination emphasizes identification of parasympathetic signs, muscle weakness, and respiratory compromise. Diagnosis is clinical, and treatment should not be delayed for laboratory confirmation.
Diagnostic testing: Red blood cell cholinesterase levels best reflect synaptic inhibition but are often delayed, while plasma cholinesterase levels are more rapidly available but less specific. Severity correlates with the degree of enzyme inhibition, though therapy must begin immediately regardless of results. Additional testing includes CBC, electrolytes, renal function, glucose, arterial blood gas when respiratory symptoms are present, ECG for dysrhythmias or heart block, and chest radiography if pulmonary edema or aspiration is suspected.
Management: Initial management prioritizes decontamination and protection of healthcare workers using appropriate personal protective equipment. All contaminated clothing should be removed and double-bagged, and skin thoroughly washed with soap and water. Airway protection, oxygenation, and ventilatory support are critical, with early intubation when indicated. Atropine is the primary antidote for muscarinic symptoms and should be administered in escalating doses every five minutes until bronchial secretions are dry, without using pupil size or heart rate as treatment endpoints. Pralidoxime should be given early to reverse nicotinic effects and regenerate cholinesterase before enzyme aging occurs, improving muscle strength and reducing paralysis. Supportive care includes frequent suctioning, avoidance of succinylcholine during intubation, and cautious gastric decontamination in early severe ingestions.
Disposition and follow-up: Any symptomatic patient or those requiring atropine should be admitted, typically to an intensive care setting, for close monitoring. Asymptomatic patients may be discharged after 6–12 hours of observation with clear return precautions and reliable follow-up. Intentional exposures require psychiatric evaluation, and poison control or toxicology consultation is recommended for significant or ongoing symptoms.
Key points: Inadequate atropine dosing is the most common cause of treatment failure. Clinical diagnosis should guide therapy without delay for laboratory confirmation. Recognition and aggressive management of respiratory compromise are essential to reduce mortality.
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KembaraXtra-Emergency and Acute Medicine - Osgood–Schlatter Disease
Description: Osgood–Schlatter disease is the most common cause of knee pain in children aged 10–15 years and represents a benign, self-limited extra-articular condition. It is characterized by pain, swelling, and tenderness over the tibial tuberosity at the insertion of the patellar tendon, just below the knee joint. Symptoms are activity related, worsening with exercise and improving with rest, and are commonly seen in physically active adolescents during periods of rapid growth.
Etiology: The most widely accepted mechanism involves repetitive traction and microfractures at the tibial tubercle apophysis caused by repeated stress from the patellar tendon. Activities that involve running, jumping, and sudden changes in direction increase strain on the extensor mechanism and precipitate symptoms.
Clinical features: Patients present with localized pain and swelling over the tibial tuberosity that is exacerbated by running, jumping, kneeling, or climbing stairs and relieved by rest. The condition is usually unilateral, although bilateral involvement occurs in approximately 20% of cases. Risk factors include age between 10 and 15 years, male sex, pubertal growth spurts, and participation in sports such as soccer, basketball, volleyball, and skating.
Physical examination: Examination reveals prominence, tenderness, and soft tissue swelling over the tibial tuberosity with pain reproduced by resisted knee extension. Quadriceps and hamstring tightness is common compared with the unaffected side. Mild erythema may be present, but the knee joint examination itself is otherwise normal, with no effusion or instability.
Evaluation: Diagnosis is primarily clinical based on history and examination. Imaging is not routinely required but may be obtained if the diagnosis is uncertain or to exclude other pathology. Plain knee radiographs may show fragmentation or irregular ossification of the tibial tuberosity, while ultrasound can demonstrate associated soft tissue changes.
Management: Treatment is conservative and focuses on symptom control and activity modification. Patients should rest from painful activities for approximately 6–8 weeks, particularly avoiding jumping and cutting sports. Ice application, stretching of the quadriceps and hamstrings, and use of analgesics such as ibuprofen or acetaminophen are recommended. An infrapatellar tendon strap or protective padding may reduce strain during activities. Corticosteroid injections should be avoided, and reassurance is essential as the condition resolves with skeletal maturity.
Disposition and follow-up: Admission is not required, and patients can be safely discharged home. Follow-up with a pediatrician or primary care provider in 2–3 weeks is advised to reassess symptoms and activity tolerance. Referral to pediatric orthopedics is rarely necessary and is reserved for patients
