Emergency and Acute Medicine - Seborrheic Dermatitis




Seborrheic dermatitis is a common, chronic papulosquamous inflammatory skin disorder that affects individuals of all ages. It ranges in severity from mild dandruff to extensive, greasy, scaling plaques that are typically yellow to red or brown in color. The condition most often involves areas rich in sebaceous glands, such as the scalp, face, chest, and skin folds. It follows a relapsing and remitting course, with exacerbations frequently triggered by physical stress, emotional stress, or intercurrent illness.


The exact cause of seborrheic dermatitis is not fully understood, but it is considered multifactorial. Environmental, genetic, hormonal, immunologic, and microbial influences all play a role. A strong association exists with the yeast Malassezia, which thrives in sebaceous areas and contributes to inflammation. The disease involves a complex interaction of immune responses, inflammation, and increased epidermal turnover. Certain conditions predispose individuals to more severe or refractory disease, including neurologic disorders such as Parkinson disease, immunosuppression such as HIV/AIDS, mood disorders, and chronic systemic illness. Various medications, including lithium and interferon, may also exacerbate the condition.


Clinical presentation varies by age group. In infants, seborrheic dermatitis commonly appears within the first few weeks of life and is usually self-limited, resolving by 12 months. The classic manifestation is cradle cap, characterized by thick, greasy scales on the scalp, sometimes accompanied by inflammation or secondary infection. It may also involve flexural areas, presenting similarly to diaper dermatitis. In children, seborrheic dermatitis may present as blepharitis with scaling along the eyelid margins and can be persistent or resistant to treatment.


In adolescents and adults, seborrheic dermatitis typically presents with mild itching and greasy, fine scaling over erythematous skin. The distribution is usually bilateral and symmetrical, affecting the scalp, eyebrows, eyelids, nasolabial folds, ears, posterior neck, and presternal area, as well as body folds such as the axillae and groin. In individuals with darker skin tones, affected areas may show hypopigmentation. The condition is often exacerbated by infrequent washing and environmental stressors.


Diagnosis is primarily clinical, based on history and physical examination. Laboratory testing is rarely required but may include potassium hydroxide preparation to assess for yeast or fungal cultures to exclude dermatophyte infections. Skin biopsy is seldom necessary and is reserved for unclear or treatment-resistant cases.


Management focuses on controlling symptoms rather than curing the disease, as seborrheic dermatitis is chronic. General measures include patient education, regular cleansing, and the use of emollients such as mineral oil to soften scales before removal. Gentle brushing after washing can help remove adherent scales. Moderate exposure to sunlight may also be beneficial due to its inhibitory effect on yeast growth.


Pharmacologic treatment is typically multifaceted. First-line therapy includes topical antifungal agents such as ketoconazole, which target Malassezia species, along with low-potency topical corticosteroids like hydrocortisone for short-term control of inflammation. Medicated shampoos containing pyrithione zinc, selenium sulfide, coal tar, or salicylic acid are commonly used, especially for scalp involvement. In more resistant cases, second-line treatments include ciclopirox and topical calcineurin inhibitors such as tacrolimus or pimecrolimus, which provide anti-inflammatory effects without the long-term risks of corticosteroids.


In infants, treatment is generally gentle and supportive, using emollients, mild shampoos, and low-potency topical steroids if needed. Blepharitis associated with seborrheic dermatitis is managed with warm compresses and careful cleansing of the eyelid margins. Severe cases, particularly those involving extensive scaling or secondary infection, may require more intensive therapy.


The prognosis is generally good, although seborrheic dermatitis tends to be chronic with recurrent flares. Symptoms often improve within 7 to 10 days of treatment, but complete resolution may take longer, and recurrence is common. Patients should be advised about the chronic nature of the condition and the importance of maintenance therapy.


Important clinical considerations include recognizing that sudden or severe seborrheic dermatitis may be a sign of underlying immunosuppression, particularly HIV infection. Overuse of topical corticosteroids should be avoided due to the risk of skin atrophy and rebound flares. Clinicians should also remain vigilant for signs of secondary bacterial or fungal infection, such as increased erythema, tenderness, or systemic symptoms, which may require additional treatment.

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Emergency and Acute Medicine – Sciatica / Herniated Disc




Sciatica, most commonly caused by a herniated lumbar disc, refers to radicular pain radiating from the lower back into the buttock and down the leg (typically below the knee). It is highly suggestive of nerve root compression, with about 95% of cases involving the L5 or S1 nerve roots. The condition has a 3–5% lifetime prevalence, most commonly affecting individuals in their 40s to 50s, and accounts for a subset of low back pain presentations. Fortunately, ~90% of patients improve with conservative treatment, and symptoms usually resolve within 6 weeks, though a small percentage require surgery.


The underlying mechanism involves herniation of the nucleus pulposus through the annulus fibrosus, leading to compression and inflammation of adjacent nerve roots. Common risk factors include smoking, obesity, repetitive lifting or twisting, prolonged vibration exposure (e.g., driving machinery), and sedentary lifestyle. Symptoms often begin with low back pain, followed by progressively dominant leg pain that is sharp, well localized, and radiates distally.


Patients typically report worsening pain with activities that increase intradiscal pressure, such as coughing, sneezing, or straining (Valsalva maneuver), as well as prolonged sitting or leg elevation. Pain is often relieved by lying supine or walking. The most common sensory symptom is paresthesia. On examination, a detailed neurologic assessment is essential. Findings depend on the affected nerve root:

• L4 (L3–L4 disc): Knee extension weakness, reduced patellar reflex, sensory loss over medial leg
• L5 (L4–L5 disc): Weakness in great toe dorsiflexion, sensory loss in 1st web space
• S1 (L5–S1 disc): Weak plantarflexion, reduced Achilles reflex, sensory loss over lateral foot

The straight leg raise (SLR) test is a key bedside maneuver—raising the affected leg to 30–60° reproducing radicular pain is highly sensitive. A crossed SLR test (pain in the affected leg when lifting the opposite leg) is less sensitive but highly specific.


Diagnosis is primarily clinical. Imaging is not routinely required unless red flags are present (e.g., trauma, fever, cancer history, severe or progressive neurologic deficits). MRI is the gold standard when indicated—especially in cases of suspected infection, severe deficits, or failure of conservative therapy after 6 weeks. Importantly, imaging findings must be correlated clinically, as many asymptomatic individuals have disc abnormalities.


Emergency management focuses on excluding neurosurgical emergencies, particularly cauda equina syndrome (e.g., urinary retention, saddle anesthesia, decreased rectal tone). In uncomplicated cases, treatment is conservative, including:

• NSAIDs (first-line) for pain relief
• Short-term use of muscle relaxants or opioids if needed
• Early mobilization (avoid prolonged bed rest—max 1–2 days)

Patients should be advised to gradually resume activity while avoiding heavy lifting, bending, twisting, and vibration exposure.


Admission is required for severe or progressive neurologic deficits, inability to ambulate, suspected infection, malignancy, or cauda equina syndrome. Most patients can be safely discharged with follow-up within 1 week and a plan for conservative therapy over 4–6 weeks.


A critical clinical pearl is to always assess for red flags and neurologic deficits, as missing serious causes (e.g., epidural abscess or cauda equina syndrome) can lead to permanent disability. Conversely, overuse of imaging should be avoided in uncomplicated cases, as most patients improve without intervention.

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Emergency and Acute Medicine – Schizophrenia




Schizophrenia is a chronic psychotic disorder characterized by delusions, hallucinations, disorganized thinking and behavior, negative symptoms, and cognitive impairment. The illness typically progresses through three phases: a premorbid phase with social withdrawal and decline in functioning, an active phase with prominent psychotic symptoms, and a residual phase marked by persistent cognitive and social deficits. Onset is usually in early adulthood (before age 30), and comorbid substance use—especially alcohol, cannabis, and stimulants—is common. Patients have a reduced life expectancy (by 12–25 years), largely due to cardiovascular disease, suicide (5–10%), and barriers to accessing medical care.


The exact cause remains unclear, but dysfunction in dopamine pathways is strongly implicated. There is a significant genetic component, with higher concordance in identical twins, and associations with conditions such as 22q11.2 deletion syndrome. Environmental and developmental factors—including prenatal infections, advanced paternal age, and cannabis use—may contribute. Schizophrenia is best understood as a multifactorial neurodevelopmental disorder with both biological and environmental influences.


Diagnosis is clinical and based on criteria (e.g., DSM) requiring at least two core symptoms for more than 6 months, including delusions, hallucinations, disorganized speech, disorganized/catatonic behavior, or negative symptoms (e.g., flat affect, apathy, social withdrawal). Patients often present to the emergency setting with acute psychosis, agitation, or behavioral disturbance, frequently related to medication noncompliance. A thorough evaluation must include screening for danger to self or others, substance use, and medical causes of psychosis (e.g., delirium, metabolic disturbances, neurologic disease), as schizophrenia does not typically impair orientation.


Emergency management prioritizes safety. Patients may be unpredictable or agitated, requiring a calm environment, verbal de-escalation, and sometimes physical or chemical restraints. First-line pharmacologic treatment for acute agitation includes antipsychotics such as haloperidol, often combined with benzodiazepines like lorazepam. Alternative agents include olanzapine, ziprasidone, and aripiprazole, though caution is required (e.g., avoid combining IM olanzapine with IV benzodiazepines due to risk of cardiopulmonary collapse). Continuous monitoring and a structured environment are essential.


Long-term treatment centers on antipsychotic medications. First-generation (typical) agents are effective but carry higher risk of extrapyramidal side effects, while second-generation (atypical) agents are better tolerated but associated with metabolic syndrome and weight gain. Clozapine is the most effective for treatment-resistant cases and reducing suicide risk but requires strict monitoring due to risk of agranulocytosis. Long-acting injectable formulations improve adherence in patients with frequent relapse due to noncompliance.


Disposition depends on patient safety and functional status. Hospital admission is indicated if the patient poses a danger to self or others, is unable to care for themselves, or has new-onset psychosis requiring evaluation. Stable patients with support and follow-up may be discharged with close psychiatric follow-up within 1 week.


Key clinical pearls include maintaining a high index of suspicion for medical causes of atypical psychosis, recognizing neuroleptic malignant syndrome in patients on antipsychotics, and understanding that early treatment improves long-term outcomes. Management is not only pharmacologic but also involves psychosocial support, therapy, and addressing comorbid conditions, especially substance use and cardiovascular risk factors.

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Emergency and Acute Medicine – Scaphoid Fractures




A scaphoid fracture is the most common fracture of the carpal bones and typically occurs after a fall on an outstretched hand (FOOSH). The scaphoid plays a key stabilizing role between the proximal and distal carpal rows, so injury to this bone can lead to significant long-term complications such as arthritis, malunion, or avascular necrosis (AVN). Fractures most commonly occur at the waist (middle third, 70–80%), followed by the proximal and distal thirds. Because the blood supply enters distally, fractures closer to the proximal pole have a much higher risk of AVN.


Clinically, patients usually present with wrist pain after trauma, especially after FOOSH. The most important physical finding is tenderness in the anatomic snuffbox, which is highly sensitive (≈90%) but not very specific. Additional findings include pain with axial loading of the thumb, tenderness over the scaphoid tubercle, and reduced wrist or thumb range of motion. Despite these signs, diagnosis can be tricky because 10–15% of fractures are not visible on initial X-rays, making clinical suspicion crucial.


Initial imaging includes wrist radiographs (PA, lateral, oblique, and scaphoid views), but a normal X-ray does not exclude a fracture. If suspicion remains high, the injury should be treated as a fracture, and repeat imaging in 7–10 days or advanced imaging (MRI or bone scan) should be arranged. MRI is particularly useful as it can detect fractures within a few days of injury.


Management in the emergency setting focuses on immobilization and prevention of complications. Any patient with snuffbox tenderness should be placed in a thumb spica splint, even if imaging is negative. Nondisplaced fractures are typically managed conservatively with immobilization, while displaced fractures (>1 mm) have a high risk of nonunion (up to 50%) and usually require surgical fixation. All suspected or confirmed cases should have orthopedic follow-up within 7–10 days.


A key clinical pitfall is missing the diagnosis—patients presenting with what seems like a simple wrist sprain may actually have a scaphoid fracture. Failure to immobilize can result in avascular necrosis, chronic pain, and long-term disability. Therefore, when in doubt, always treat as a fracture until proven otherwise.

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Emergency and Acute Medicine - Scabies 

Scabies (Sarcoptes scabiei infestation)




Scabies is a parasitic skin infestation caused by the mite Sarcoptes scabiei var. hominis. The mites live on the skin surface, where the fertilized female burrows into the stratum corneum to lay eggs. The hallmark symptom—intense itching (pruritus)—is not due to the mites themselves but results from a delayed type IV hypersensitivity reaction to mite proteins, eggs, and fecal material. This explains why symptoms often appear 10–30 days after initial infestation, but much faster (1–3 days) with reinfestation. Although scabies has existed for thousands of years, it remains a major global health problem, particularly in crowded and resource-limited settings.


Transmission occurs mainly through prolonged skin-to-skin contact (15–20 minutes), making it common among household members, sexual partners, and institutionalized populations. Indirect spread via clothing or bedding is less common but possible because mites can survive up to 3 days off the human body. Importantly, scabies is associated more with overcrowding than poor hygiene. Most individuals harbor only 5–15 mites, but in crusted (Norwegian) scabies, seen in immunocompromised or debilitated patients, there may be thousands to millions of mites, making it highly contagious.


Clinically, patients present with generalized itching that worsens at night, often with minimal visible findings. The classic lesion is a burrow—a thin, linear, grayish track—commonly found in the finger web spaces, wrists, elbows, waistline, axillae, buttocks, and genitalia. Secondary lesions such as papules, nodules, excoriations, or superimposed bacterial infection are often more prominent than the burrows themselves. In adults, the face and scalp are usually spared, whereas infants and young children may have widespread involvement including the face, scalp, palms, and soles, often with vesicular or bullous lesions. Crusted scabies presents differently, with thick hyperkeratotic plaques, scaling, and minimal itching despite heavy infestation.


Diagnosis is primarily clinical, based on history of pruritus, typical lesion distribution, and possible contact exposure. Skin scraping of burrows examined under microscopy may reveal mites, eggs, or fecal pellets, but sensitivity is low (<50%), so a negative test does not exclude the diagnosis. In endemic settings, empiric treatment is often reasonable. Advanced tools such as dermoscopy or PCR-based tests may assist but are not routinely required.


Management involves eradication of mites and prevention of reinfestation. First-line therapy is permethrin 5% cream, applied to the entire body (including the scalp in children) and washed off after 8–14 hours, with a repeat application in 1–2 weeks. All close contacts must be treated simultaneously, even if asymptomatic, to prevent reinfection. Oral ivermectin is an effective alternative, especially for crusted scabies or when topical therapy fails, but is avoided in pregnancy and in small children (<15 kg). Other options include crotamiton, sulfur preparations (preferred in infants <2 months and pregnant women), and rarely lindane due to neurotoxicity risk.


Environmental control is essential: clothing, bedding, and towels used within the previous 2 days should be washed in hot water or sealed in plastic bags for at least 3 days. Household surfaces should be vacuumed. Patients should be counseled that itching may persist for 1–4 weeks after successful treatment, due to ongoing hypersensitivity, and can be managed with antihistamines or topical corticosteroids.


Complications include secondary bacterial infection, which can lead to more serious conditions such as poststreptococcal glomerulonephritis or even rheumatic heart disease in endemic areas. Treatment failure is common and usually results from incorrect application, failure to treat contacts, or missed areas (e.g., scalp, under nails). A key clinical point is to consider scabies in any patient with persistent generalized pruritus, especially if there is a history of similar symptoms in close contacts.

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​Emergency And Acute Medicine – Sarcoidosis


Sarcoidosis is a chronic, multisystem inflammatory disorder characterized by the formation of noncaseating granulomas due to accumulation of T lymphocytes and mononuclear phagocytes. These granulomas disrupt normal tissue architecture, leading to organ dysfunction. The lungs are most commonly affected, making respiratory symptoms predominant. Granulomatous tissue can produce angiotensin-converting enzyme (ACE) and activate vitamin D, leading to elevated ACE levels and hypercalcemia. The disease affects individuals worldwide, typically presenting between ages 10 and 40, and is more common in Black populations in the United States.


The exact cause of sarcoidosis remains unclear but is thought to involve an exaggerated cell-mediated immune response to an unidentified antigen, either environmental or self-derived. The disease may involve virtually any organ system, resulting in a wide range of clinical presentations. Constitutional symptoms such as fatigue, fever, and general malaise are common. Pulmonary involvement often presents with dyspnea, cough, chest pain, and occasionally hemoptysis. Skin manifestations occur in about 25% of patients and include erythema nodosum, maculopapular lesions, plaques, and lupus pernio. Ocular involvement, seen in about 20% of patients, may present with uveitis, eye pain, and blurred vision.


Neurologic involvement can include cranial nerve palsies—most commonly facial nerve (CN VII)—as well as seizures or altered mental status. Cardiac sarcoidosis, though less common (approximately 5%), can be serious, presenting with arrhythmias, conduction abnormalities such as AV block, or heart failure due to restrictive cardiomyopathy. Renal manifestations may include nephrolithiasis due to hypercalcemia, and musculoskeletal symptoms often involve polyarthralgias. Classic clinical syndromes include Löfgren syndrome (bilateral hilar lymphadenopathy, erythema nodosum, and arthralgias) and Heerfordt–Waldenström syndrome (fever, uveitis, parotid gland enlargement, and facial nerve palsy).


Diagnosis is based on a combination of clinical presentation, imaging, laboratory findings, and histologic confirmation. Chest radiography is abnormal in approximately 90% of patients and is used to stage pulmonary disease, ranging from bilateral hilar lymphadenopathy (stage I) to pulmonary fibrosis (stage IV). Laboratory findings may include elevated serum ACE levels, hypercalcemia, hypercalciuria, mild liver enzyme abnormalities, and hypergammaglobulinemia. CSF analysis may show lymphocytic predominance in neurosarcoidosis. Definitive diagnosis typically requires biopsy demonstrating noncaseating granulomas, often obtained via bronchoscopy or from accessible skin lesions.


The differential diagnosis includes conditions that also produce granulomas or systemic symptoms, such as tuberculosis and other mycobacterial infections, lymphoma, interstitial lung diseases, HIV, and parathyroid disorders.


Management depends on disease severity. Many patients are asymptomatic or have mild disease that resolves spontaneously, and observation without treatment is appropriate in these cases. Corticosteroids, particularly prednisone, are the mainstay of treatment and are indicated in patients with significant or progressive pulmonary disease (stage II or III), severe ocular involvement, neurologic complications, cardiac involvement, or hypercalcemia. Lower doses are used for mild disease, while higher doses are required for severe manifestations such as neurosarcoidosis. Topical corticosteroids and cycloplegic agents may be used for ocular or cutaneous involvement.


Supportive care includes oxygen therapy for hypoxia and monitoring for cardiac arrhythmias. Patients with significant symptoms, hypoxia, or cardiac involvement may require hospital admission. Most patients can be managed as outpatients with close follow-up.


Long-term management involves multidisciplinary care. Patients should be referred to pulmonology for pulmonary function testing, cardiology for conduction abnormalities, ophthalmology for eye involvement, and rheumatology for ongoing disease management. Regular monitoring is important to assess disease progression and complications, particularly those related to chronic steroid use. Patients should also be advised to limit excessive dietary calcium due to the risk of hypercalcemia.


A key clinical pearl is that sarcoidosis often presents incidentally on chest imaging with bilateral hilar lymphadenopathy. While many cases resolve spontaneously, clinicians must remain vigilant for serious complications involving the eyes, heart, or nervous system. Corticosteroids remain the cornerstone of therapy for symptomatic disease.

Emergency And Acute Medicine – Salicylate Poisoning




Salicylate poisoning is a serious toxicologic condition characterized by a mixed respiratory alkalosis and metabolic acidosis. This occurs due to stimulation of the respiratory center (causing hyperventilation) and disruption of cellular metabolism through inhibition of the Krebs cycle and uncoupling of oxidative phosphorylation. The result is increased acid production and impaired energy utilization. Additional metabolic disturbances include dehydration, hyponatremia or hypernatremia, hypokalemia, and hypocalcemia, largely due to vomiting, sweating, and tachypnea. Severe toxicity may lead to noncardiogenic pulmonary edema caused by direct endothelial injury. Importantly, in overdose, salicylate metabolism shifts from first-order to zero-order kinetics, meaning small increases in dose can lead to disproportionately large increases in serum levels.


Salicylate toxicity can occur from a variety of sources, most commonly aspirin ingestion. Toxicity is dose-dependent, with ingestions greater than 150 mg/kg considered potentially serious and those above 300 mg/kg potentially life-threatening. Other sources include oil of wintergreen (methyl salicylate), which is highly concentrated and dangerous even in small amounts, as well as bismuth subsalicylate and salsalate. In children, even small exposures can be dangerous, and toxicity tends to develop more rapidly and severely. In contrast to adults, children may not exhibit the classic early respiratory alkalosis and instead may present early with metabolic acidosis and hypoglycemia. In elderly patients, diagnosis may be delayed due to comorbidities, and symptoms such as altered mental status or respiratory distress often indicate severe toxicity.


Clinically, patients present with gastrointestinal symptoms such as nausea, vomiting, epigastric pain, and sometimes hematemesis. Pulmonary manifestations include tachypnea and, in severe cases, pulmonary edema. Neurologic symptoms are characteristic and include tinnitus (an early sign), hearing loss, confusion, delirium, seizures, and coma. A careful history is essential, as patients may not recognize aspirin as a medication or may confuse it with other over-the-counter drugs.


Diagnosis relies on serial salicylate levels and clinical assessment. Levels should be obtained at presentation and repeated every 2 hours until a clear downward trend is established, as delayed absorption (especially with enteric-coated preparations) can lead to rising levels after initial decline. Severity is best assessed clinically rather than relying solely on serum levels, as no reliable nomogram exists. Laboratory evaluation typically reveals a mixed acid–base disorder with respiratory alkalosis and anion-gap metabolic acidosis. Additional findings may include hypokalemia, renal dysfunction, and elevated anion gap. Imaging such as abdominal radiographs may identify pill concretions, and chest radiographs may detect pulmonary edema.


Management begins with stabilization of airway, breathing, and circulation. However, maintaining spontaneous respiration is critical, as patients rely on hyperventilation to compensate for acidosis. Premature intubation can worsen acidemia and should be avoided unless absolutely necessary. Initial therapy includes intravenous fluids (normal saline) for dehydration and hypotension, along with glucose, thiamine, and naloxone in patients with altered mental status.


Gastrointestinal decontamination with activated charcoal is recommended in alert patients. Whole-bowel irrigation may be considered in cases of sustained-release ingestion or visible concretions. The cornerstone of enhanced elimination is urinary alkalinization using intravenous sodium bicarbonate. This increases salicylate ionization, reducing tissue penetration and enhancing renal excretion. The goal is a urine pH of 7.5–8.0, while maintaining adequate potassium levels to support alkalinization.


Hemodialysis is indicated in severe cases, including patients with pulmonary edema, altered mental status, severe acid–base disturbances, renal failure, or unstable vital signs. It is also considered when salicylate levels exceed 80–100 mg/dL in acute ingestion, though clinical status is more important than absolute level. The threshold for dialysis is lower in chronic toxicity.


Patients require admission for monitoring if salicylate levels exceed 25 mg/dL or if symptoms are present. ICU care is indicated for severe toxicity. Discharge is appropriate only when levels fall below 25 mg/dL and symptoms resolve. Patients with intentional overdose should receive psychiatric evaluation, while those with chronic exposure require close outpatient follow-up.


A key clinical pearl is that patients must maintain their respiratory drive to compensate for metabolic derangements; thus, unnecessary intubation can be dangerous. Additionally, salicylate levels may initially decline and then rise again due to delayed absorption, so serial monitoring is essential. Toxicity may also occur from non-oral exposures such as topical preparations or suppositories, underscoring the importance of a thorough history.

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Emergency And Acute Medicine – Sacral Fracture




Sacral fractures are a significant component of pelvic trauma, occurring in approximately 45% of all pelvic fractures and rarely presenting in isolation. These injuries are typically classified based on the orientation of the fracture line—either transverse or vertical—and their location relative to the sacral foramina and canal. Common mechanisms include axial compression (such as falls from height), direct posterior trauma, and high-energy crush injuries. In elderly or osteoporotic patients, sacral insufficiency fractures may occur even with minimal trauma and should be considered in those presenting with unexplained severe lower back or sacral pain.


Transverse fractures above the S4 level are associated with a high risk of neurologic injury, including potential development of cauda equina syndrome. Those occurring below S4 are less likely to cause neurologic deficits but may be associated with rectal injuries. Vertical fractures are further categorized into zones: lateral (zone 1), foraminal (zone 2), and central canal (zone 3). Zone 1 fractures may affect the L5 nerve root and cause sciatica but usually have minimal neurologic deficits. Zone 2 fractures frequently involve nerve roots (L5–S2) and may result in bowel or bladder dysfunction. Zone 3 fractures, involving the central canal, carry the highest risk, with more than 50% of patients experiencing significant neurologic impairment, including bowel, bladder, and sexual dysfunction.


Clinically, patients often present with pain localized to the buttocks, perirectal area, or posterior thigh. Physical findings may include swelling, ecchymosis over the sacrum, and tenderness. Neurologic deficits are critical to assess and may include decreased or absent anal sphincter tone, perineal sensory loss, and bowel or bladder incontinence. A rectal examination is essential, as it may reveal sacral tenderness or blood, suggesting an open fracture or associated rectal injury.


Evaluation begins with a thorough history and physical examination, with special attention to neurologic status, including sphincter tone and perianal sensation. Because sacral fractures are rarely isolated, clinicians must actively search for associated pelvic, spinal, and intra-abdominal injuries. Imaging is crucial for diagnosis. Plain radiographs detect only about 30% of sacral fractures, making CT scan the imaging modality of choice for accurate identification. MRI is indicated when neurologic deficits are present to assess nerve involvement and soft tissue injury.


Management follows standard trauma principles. In the prehospital setting, patients should be immobilized with spinal precautions due to the high likelihood of associated injuries. Initial stabilization focuses on airway, breathing, and circulation, along with adequate pain control using NSAIDs or opioid analgesics. Unstable vertical fractures or those associated with significant trauma require urgent evaluation for life-threatening injuries and prompt orthopedic consultation. Surgical intervention is often necessary when fractures are displaced or associated with neurologic compromise.


Isolated, nondisplaced transverse sacral fractures without neurologic deficits may be managed conservatively with limited weight-bearing and close outpatient orthopedic follow-up. However, any evidence of neurologic impairment warrants admission and specialist involvement. Elderly patients may require admission or assisted care due to reduced mobility and higher complication risk.


A key clinical pearl is that sacral fractures are seldom isolated injuries; clinicians must maintain a high index of suspicion for concurrent pelvic and spinal trauma. A detailed neurologic examination—including assessment of anal sphincter tone and perianal sensation—is essential. Additionally, placement of a Foley catheter in trauma patients may mask underlying neurogenic bladder dysfunction, so careful monitoring is required.

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Emergency And Acute Medicine – Roseola




Roseola, also known as exanthem subitum, is a common viral illness of early childhood characterized by a sudden high fever followed by the appearance of a rash. It has an incubation period of approximately 5–15 days and is transmitted person to person, likely through oral secretions, although it is not highly contagious. Humans are the only known host. The disease process involves a complex immune response including cytokine activation, antibody production, and T-cell reactivity.


The condition is caused by human herpesvirus 6 (HHV-6), a large double-stranded DNA virus closely related to cytomegalovirus. It most commonly affects infants between 6 and 12 months of age, with over 90% of cases occurring within the first two years of life. Incidence peaks in late spring and early summer. Most newborns initially have passive immunity from maternal antibodies, but by age 1–2 years, the majority become seropositive.


Clinically, roseola is usually self-limited. The classic presentation is the abrupt onset of high fever (39.4–41.2°C or 103–106°F) in a well-appearing child, lasting about 3–4 days. Despite the high fever, the child often appears relatively well, though irritability, decreased appetite, and mild diarrhea may occur. As the fever resolves (defervescence), a maculopapular rash appears, starting on the trunk and spreading to the neck and extremities. The rash typically fades within 3 days. Physical examination may reveal cervical and postoccipital lymphadenopathy, erythematous papules on the soft palate (Nagayama spots), and occasionally otitis media. A bulging fontanelle may be seen in some infants.


Complications are uncommon but include febrile seizures, occurring in 5–35% of cases due to rapid temperature rise. Rare complications include aseptic meningitis, encephalopathy, and thrombocytopenic purpura. In immunocompromised patients, reactivation can lead to severe disease such as hepatitis, bone marrow suppression, pneumonia, or encephalitis.


Diagnosis is primarily clinical, based on the characteristic pattern of high fever followed by rash in a well-appearing child. Laboratory testing is usually unnecessary. If performed, a complete blood count may initially show leukocytosis followed by normalization with relative lymphocytosis, and sometimes mild thrombocytopenia. HHV-6 DNA can be detected via PCR, and serologic testing may show early IgM followed by IgG, though these are rarely needed. Lumbar puncture is reserved for cases where meningitis is suspected.


The differential diagnosis includes scarlet fever, measles (with cough, coryza, conjunctivitis, and Koplik spots), rubella (rash begins with fever), Rocky Mountain spotted fever (rash starts on wrists and ankles), erythema infectiosum (fifth disease), dengue fever, pneumococcal bacteremia, and meningitis—especially in infants with a bulging fontanelle.


Management is supportive. Treatment focuses on fever control with antipyretics such as acetaminophen or ibuprofen and ensuring adequate hydration. No antiviral therapy is recommended in immunocompetent children. ABC stabilization is only required if complications arise.


Most patients can be safely discharged home. Admission is reserved for children who appear toxic or do not respond to supportive care. Parents should be advised to seek reevaluation if fever persists beyond 3–4 days or if symptoms worsen. Children generally should not return to daycare until the rash has resolved.


A key clinical pearl is that the child with roseola typically appears well despite very high fever, which helps distinguish it from more serious infections. Febrile seizures should be appropriately evaluated, but overall prognosis is excellent in otherwise healthy children.

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Emergency And Acute Medicine – Rubella




Rubella, also known as German measles or “3-day measles,” is an acute viral illness transmitted via respiratory droplets. It is moderately contagious, particularly during the period surrounding rash onset. Patients are infectious from approximately 7 days before to 5 days after the appearance of the rash. The incubation period ranges from 14 to 21 days. Up to 50% of infections may be subclinical. Infants with congenital rubella syndrome (CRS) are especially important reservoirs, as they can shed large amounts of virus for months after birth.


The disease is caused by the rubella virus, a member of the Togaviridae family (genus Rubivirus). Vaccination with the live attenuated measles–mumps–rubella (MMR) vaccine is highly effective and is recommended for all children older than 12 months, as well as women of childbearing age who are not immune. A single dose typically provides lifelong protection.


Clinically, rubella is usually a mild, self-limited illness. Patients often present with low-grade fever, malaise, headache, and mild upper respiratory symptoms. The characteristic rash begins on the face and spreads rapidly downward (cephalocaudal spread), usually completing its spread within 24 hours. The rash consists of faint red macules that evolve into pink-red maculopapules, often with mild itching, and typically resolves within 3 days without coalescing—unlike measles. A key distinguishing feature is prominent lymphadenopathy, especially involving the postauricular, occipital, and posterior cervical lymph nodes.


Complications are generally uncommon but occur more frequently in adults. Arthritis is the most common complication, particularly in women (up to 79%), affecting joints such as the knees, wrists, and fingers; it typically begins a few days after illness onset and is usually self-limited. Hemorrhagic complications due to thrombocytopenia are more common in children. Neurologic complications, including encephalitis, are rare but can occur, particularly in adults, and generally have a good prognosis.


The most serious consequence of rubella infection is congenital rubella syndrome (CRS), which occurs when a pregnant woman—especially during the first trimester—is infected. CRS can lead to severe fetal abnormalities, including hearing loss, intellectual disability, congenital heart defects, and ocular abnormalities. Because of this, rubella is a major public health concern despite its typically mild presentation in children.


Diagnosis is often clinical, based on the characteristic rash and lymphadenopathy. Laboratory confirmation can be obtained with rubella-specific IgM antibodies (detectable about 4 days after rash onset) or by demonstrating a rise in antibody titers between acute and convalescent samples. Reverse transcriptase PCR may also detect viral RNA. Laboratory findings may include leukopenia and thrombocytopenia, particularly in children. Testing is especially important in pregnant women with suspected exposure.


The differential diagnosis includes measles (which presents with higher fever, cough, coryza, conjunctivitis, and Koplik spots), scarlet fever (with a “sandpaper” rash and strawberry tongue), roseola (rash after fever resolution), Rocky Mountain spotted fever (rash beginning at wrists and ankles), and other viral exanthems.


Management is primarily supportive. Treatment includes rest, hydration, and symptomatic relief with antipyretics such as acetaminophen or ibuprofen. There is no specific antiviral therapy. Patients should be isolated from susceptible individuals—especially pregnant women and immunocompromised persons—for at least 7 days after rash onset.


Prevention through vaccination is critical. The MMR vaccine is indicated for children older than 12 months, unimmunized individuals, healthcare workers, and women of childbearing age who are not pregnant. Vaccination is contraindicated during pregnancy, and women are advised to avoid pregnancy for at least 3 months after receiving the vaccine. Immunoglobulin may be considered after exposure in certain high-risk individuals, but it does not prevent infection and only modifies disease severity.


Most patients can be managed as outpatients. Hospital admission is reserved for severe complications such as encephalitis or CRS. Pregnant women with suspected exposure or infection require close follow-up, serologic monitoring, and obstetric consultation.


A key clinical pearl is the importance of recognizing rubella due to its implications for pregnancy. Additionally, current evidence does not support any causal link between rubella vaccination and autism spectrum disorders.

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