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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.
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.
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.
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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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Infectious Disease and Microbiology – Cholecystitis and Cholangitis
Cholecystitis refers to acute or chronic inflammation of the gallbladder. Cholangitis is a clinical syndrome characterized by systemic infection originating in the biliary tract, usually due to obstruction. Emphysematous cholecystitis is a severe form of gallbladder inflammation in which gas forms within the gallbladder lumen, wall, or surrounding tissues.
Acute cholecystitis accounts for 3–10% of patients presenting with abdominal pain, increasing to approximately 20% among individuals older than 50 years. Among patients with gallstones (cholelithiasis), 1–4% annually develop biliary colic, and if untreated, about 20% of symptomatic individuals may later develop acute cholecystitis.
In 90–95% of cases, acute cholecystitis results from gallstone obstruction. Risk factors for gallstone formation include obesity, rapid weight loss, hemolytic diseases (such as sickle cell disease and G6PD deficiency), and certain ethnic backgrounds (e.g., Pima Indians). Gallstones are more than twice as common in women as in men, although cholecystitis tends to be more severe in men.
Acalculous cholecystitis occurs without gallstones and is associated with serious medical conditions such as diabetes mellitus, sepsis, ischemia, trauma, burns, prolonged total parenteral nutrition, vasculitis, collagen vascular diseases, sarcoidosis, HIV/AIDS, and certain infections (e.g., tuberculosis and parasitic infections). It is slightly more common in men and is associated with higher complication rates. Emphysematous cholecystitis is more frequent in elderly patients and those with diabetes.
Acute calculous cholecystitis results from obstruction of the cystic duct by gallstones. Acalculous cholecystitis develops due to gallbladder stasis and bile stagnation. Acute cholangitis occurs when obstruction of the common bile duct leads to increased biliary pressure, facilitating bacterial translocation into the bloodstream and resulting in systemic infection.
Common pathogens in biliary infections are polymicrobial and include Escherichia coli, Klebsiella species, Enterococcus species, Enterobacter species, and Pseudomonas species. Anaerobes are more common in elderly patients, diabetics, and those with prior biliary surgery. Obstructive causes of cholangitis include choledocholithiasis, malignant strictures, iatrogenic bile duct injury, primary sclerosing cholangitis, congenital biliary abnormalities, and parasitic infections such as Clonorchis, Opisthorchis, and Ascaris.
Clinically, biliary disease often presents with right upper quadrant abdominal pain that may radiate to the right scapular or infrascapular area. Acute cholecystitis typically begins with biliary colic and fever that progressively worsen. Unlike biliary colic, the pain is continuous. Approximately 60–70% of patients report prior self-limited episodes. Acalculous cholecystitis may present with unexplained fever or vague abdominal discomfort, particularly in critically ill patients.
Acute cholangitis classically presents with Charcot’s triad: fever with chills, jaundice, and right upper quadrant pain. However, only 50–70% of patients exhibit all three features. Severe cases may present with Reynolds’ pentad, which includes hypotension and altered mental status in addition to Charcot’s triad, indicating sepsis and possible organ failure.
On physical examination, right upper quadrant tenderness is highly sensitive for biliary tract disease. A positive Murphy’s sign—pain during inspiration while palpating the right upper quadrant—is suggestive of acute cholecystitis.
Laboratory findings in acute cholecystitis often include fever and leukocytosis. A temperature above 38.5°C or white blood cell count greater than 12,500/mm³ suggests infection. Mild elevations in serum bilirubin and aminotransferases are common. Elevated amylase may indicate concomitant gallstone pancreatitis. Abnormal renal function, thrombocytopenia, or coagulopathy suggest more severe disease. Bile cultures are frequently positive in cases of obstruction and jaundice.
Ultrasonography is the primary imaging modality for diagnosing cholecystitis. Findings include gallbladder wall thickening (>2 mm), pericholecystic fluid, intramural gas, ductal dilation, and a sonographic Murphy’s sign. Hepatobiliary scintigraphy may be used if ultrasound is inconclusive; failure of gallbladder filling suggests cystic duct obstruction. CT scanning can identify bile duct dilation, pneumobilia, or complications and may assist in diagnosing cholangitis.
Management includes prompt administration of antibiotics targeting Enterobacteriaceae. For mild-to-moderate community-acquired acute cholecystitis, recommended regimens include cefazolin, cefuroxime, or ceftriaxone. In severe cases, elderly or immunocompromised patients, or in acute cholangitis, broad-spectrum therapy such as piperacillin–tazobactam, carbapenems, cefepime plus metronidazole, or fluoroquinolones plus metronidazole is indicated. Vancomycin may be added in healthcare-associated infections. Anti-enterococcal coverage is generally not required in uncomplicated community-acquired infections.
Supportive care includes bowel rest, intravenous fluids, correction of electrolyte imbalances, and analgesia. Antibiotics are typically initiated within one hour before cholecystectomy and discontinued within 24 hours postoperatively if infection is confined to the gallbladder.
Early laparoscopic cholecystectomy is preferred over delayed surgery due to lower complication rates and shorter recovery. In severe cases or when surgery is contraindicated, biliary decompression may be achieved through percutaneous drainage or endoscopic retrograde cholangiopancreatography (ERCP). Acute cholangitis often requires urgent biliary drainage in addition to antibiotics.
Prognosis for acute cholecystitis is generally favorable with timely treatment, although recurrence is common if the gallbladder is not removed. Acute cholangitis carries a mortality rate of 10–30%, especially in elderly patients or those with severe sepsis.
Complications include chronic cholecystitis, empyema of the gallbladder, perforation, fistula formation, hepatic abscess, sepsis, and recurrent biliary obstruction. Severe acute cholangitis may result in shock, organ failure, and disseminated infection if not promptly treated.
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Infectious Disease and Microbiology – Cervicitis
Cervicitis is a sexually transmitted infection characterized by inflammation of the endocervix and/or ectocervix. It is frequently encountered in sexually active adolescents and young adults, particularly women under 25 years of age.
Cervicitis is common among sexually active adolescent girls under 20 years and young adults aged 20–24 years. In a large U.S. cohort study of individuals aged 18–26 years, the prevalence of chlamydial infection was approximately 4.2%, with higher rates among women than men. Gonorrhea was less common, with a prevalence of 0.4%, and coinfection with both pathogens was rare.
Major risk factors include a new sexual partner within the past 3 months, multiple sexual partners within 6 months, a partner with multiple partners, and inconsistent use of barrier contraception. Preventive strategies emphasize safe sex practices, evaluation and treatment of sexual partners, and annual screening for Chlamydia trachomatis in sexually active women aged 25 years or younger and older women with risk factors. Presumptive treatment is recommended when local prevalence of chlamydia or gonorrhea is high or when follow-up is uncertain.
The most common etiologic agents are Chlamydia trachomatis and Neisseria gonorrhoeae. Other organisms include Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma urealyticum, and herpes simplex virus. In many cases, no pathogen is identified. Vaginal infections such as Trichomonas vaginalis or Candida albicans may extend to involve the ectocervix. Rarely, cytomegalovirus is implicated.
Cervicitis is frequently asymptomatic. When present, symptoms include abnormal vaginal discharge, postcoital bleeding, dysuria, urinary frequency, and dyspareunia. On physical examination, a yellow mucopurulent discharge may be visible in the endocervical canal, and the cervix may be friable and bleed easily on contact.
Diagnostic evaluation includes culture of cervical discharge and nucleic acid amplification testing (NAAT) for C. trachomatis and N. gonorrhoeae, which can be performed on endocervical swabs, vaginal swabs, or urine samples. Gram stain may detect gram-negative intracellular diplococci, which are highly specific for gonococcal infection but less sensitive in cervicitis than in male urethritis. Microscopic examination of vaginal fluid may show leukorrhea (>10 white blood cells per high-power field), which is associated with chlamydial and gonococcal infection. Women with cervicitis should also be evaluated for bacterial vaginosis, trichomoniasis, and pelvic inflammatory disease. If cervical ulcers are present, testing for herpes simplex virus is indicated.
Management includes appropriate treatment of the patient and sexual partners. Patients and partners should abstain from sexual activity until therapy is completed (7 days after single-dose therapy or after completion of a 7-day regimen). In HIV-infected women, treatment reduces cervical viral shedding and transmission risk. In pre-adolescent children, sexually transmitted pathogens warrant evaluation for possible sexual abuse.
Empiric therapy is appropriate when follow-up is uncertain or prevalence of infection is high. For chlamydial infection, first-line treatment includes azithromycin 1 g orally as a single dose or doxycycline 100 mg orally twice daily for 7 days. For gonococcal infection, ceftriaxone 250 mg intramuscularly as a single dose is recommended. Alternative regimens for chlamydia include ofloxacin, levofloxacin, or erythromycin. For gonorrhea, oral cephalosporins such as cefixime or cefpodoxime may be used, although they may be less effective than ceftriaxone. Fluoroquinolones are not recommended because of increasing resistance.
In pregnancy, azithromycin or amoxicillin is recommended for chlamydial infection. Doxycycline and fluoroquinolones are contraindicated. Gonorrhea in pregnancy is treated with ceftriaxone. Erythromycin formulations may be used as alternatives, though erythromycin estolate is contraindicated due to risk of hepatotoxicity.
Test-of-cure for chlamydia is recommended only when adherence is uncertain, symptoms persist, reinfection is suspected, or in pregnancy. NAAT testing should not be performed within 3 weeks of treatment due to possible false-positive results from nonviable organisms. Routine test-of-cure is not required for uncomplicated gonorrhea treated appropriately unless symptoms persist. Repeat screening within 3–4 months is recommended due to high reinfection rates, especially in adolescents.
Complications of untreated cervicitis include pelvic inflammatory disease, infertility, ectopic pregnancy, chorioamnionitis, premature rupture of membranes, and puerperal infections. Early detection, treatment, and partner management are essential to reduce long-term reproductive morbidity.
Cervicitis is a sexually transmitted infection characterized by inflammation of the endocervix and/or ectocervix. It is frequently encountered in sexually active adolescents and young adults, particularly women under 25 years of age.
Cervicitis is common among sexually active adolescent girls under 20 years and young adults aged 20–24 years. In a large U.S. cohort study of individuals aged 18–26 years, the prevalence of chlamydial infection was approximately 4.2%, with higher rates among women than men. Gonorrhea was less common, with a prevalence of 0.4%, and coinfection with both pathogens was rare.
Major risk factors include a new sexual partner within the past 3 months, multiple sexual partners within 6 months, a partner with multiple partners, and inconsistent use of barrier contraception. Preventive strategies emphasize safe sex practices, evaluation and treatment of sexual partners, and annual screening for Chlamydia trachomatis in sexually active women aged 25 years or younger and older women with risk factors. Presumptive treatment is recommended when local prevalence of chlamydia or gonorrhea is high or when follow-up is uncertain.
The most common etiologic agents are Chlamydia trachomatis and Neisseria gonorrhoeae. Other organisms include Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma urealyticum, and herpes simplex virus. In many cases, no pathogen is identified. Vaginal infections such as Trichomonas vaginalis or Candida albicans may extend to involve the ectocervix. Rarely, cytomegalovirus is implicated.
Cervicitis is frequently asymptomatic. When present, symptoms include abnormal vaginal discharge, postcoital bleeding, dysuria, urinary frequency, and dyspareunia. On physical examination, a yellow mucopurulent discharge may be visible in the endocervical canal, and the cervix may be friable and bleed easily on contact.
Diagnostic evaluation includes culture of cervical discharge and nucleic acid amplification testing (NAAT) for C. trachomatis and N. gonorrhoeae, which can be performed on endocervical swabs, vaginal swabs, or urine samples. Gram stain may detect gram-negative intracellular diplococci, which are highly specific for gonococcal infection but less sensitive in cervicitis than in male urethritis. Microscopic examination of vaginal fluid may show leukorrhea (>10 white blood cells per high-power field), which is associated with chlamydial and gonococcal infection. Women with cervicitis should also be evaluated for bacterial vaginosis, trichomoniasis, and pelvic inflammatory disease. If cervical ulcers are present, testing for herpes simplex virus is indicated.
Management includes appropriate treatment of the patient and sexual partners. Patients and partners should abstain from sexual activity until therapy is completed (7 days after single-dose therapy or after completion of a 7-day regimen). In HIV-infected women, treatment reduces cervical viral shedding and transmission risk. In pre-adolescent children, sexually transmitted pathogens warrant evaluation for possible sexual abuse.
Empiric therapy is appropriate when follow-up is uncertain or prevalence of infection is high. For chlamydial infection, first-line treatment includes azithromycin 1 g orally as a single dose or doxycycline 100 mg orally twice daily for 7 days. For gonococcal infection, ceftriaxone 250 mg intramuscularly as a single dose is recommended. Alternative regimens for chlamydia include ofloxacin, levofloxacin, or erythromycin. For gonorrhea, oral cephalosporins such as cefixime or cefpodoxime may be used, although they may be less effective than ceftriaxone. Fluoroquinolones are not recommended because of increasing resistance.
In pregnancy, azithromycin or amoxicillin is recommended for chlamydial infection. Doxycycline and fluoroquinolones are contraindicated. Gonorrhea in pregnancy is treated with ceftriaxone. Erythromycin formulations may be used as alternatives, though erythromycin estolate is contraindicated due to risk of hepatotoxicity.
Test-of-cure for chlamydia is recommended only when adherence is uncertain, symptoms persist, reinfection is suspected, or in pregnancy. NAAT testing should not be performed within 3 weeks of treatment due to possible false-positive results from nonviable organisms. Routine test-of-cure is not required for uncomplicated gonorrhea treated appropriately unless symptoms persist. Repeat screening within 3–4 months is recommended due to high reinfection rates, especially in adolescents.
Complications of untreated cervicitis include pelvic inflammatory disease, infertility, ectopic pregnancy, chorioamnionitis, premature rupture of membranes, and puerperal infections. Early detection, treatment, and partner management are essential to reduce long-term reproductive morbidity.
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Infectious Disease and Microbiology – Chronic Fatigue Syndrome
Chronic Fatigue Syndrome (CFS) is a heterogeneous disorder characterized by severe, persistent, and debilitating fatigue lasting at least six months. The fatigue is not relieved by rest and significantly interferes with daily functioning. In children, CFS is rare, but school absenteeism or withdrawal from normal activities should be monitored as indicators of functional impairment similar to adult disability.
The estimated prevalence in the United States ranges from 4.0 to 8.7 per 100,000 people, with a worldwide prevalence of approximately 0.6–1%. CFS is two to three times more common in women than in men. Ongoing research is evaluating potential genetic predispositions, but no specific genetic markers have been definitively linked to the disorder.
The pathophysiology of CFS remains uncertain. The etiology is unknown, although infectious triggers have been proposed. Associations with Epstein–Barr virus (EBV), cytomegalovirus (CMV), human herpesviruses, hepatitis C virus (HCV), Borrelia burgdorferi (Lyme disease), and Brucella species have been suggested but not conclusively proven. Immune dysfunction and abnormalities of the hypothalamic–pituitary–adrenal axis or autonomic nervous system have also been hypothesized. Depression and fibromyalgia are commonly associated conditions.
Diagnosis is clinical and remains one of exclusion. According to the 1994 CDC criteria, patients must have unexplained, persistent fatigue lasting more than six months, along with at least four of the following symptoms: post-exertional malaise; unrefreshing sleep; impaired memory or concentration; muscle pain; multi-joint pain without swelling or redness; tender cervical or axillary lymph nodes; sore throat; or headache. Physical examination is often unremarkable, although tender lymphadenopathy may be present. There are no specific laboratory or imaging findings; testing is performed primarily to exclude alternative causes of fatigue.
The differential diagnosis is broad and includes depression, CMV infection, EBV infection, brucellosis, post-influenza fatigue, Lyme disease, HIV infection, collagen-vascular disorders, malignancies with paraneoplastic syndromes, and brain tumors.
Treatment is supportive and multidisciplinary, aiming for gradual functional improvement rather than immediate resolution of symptoms. Antidepressants may be used when mood disorders coexist. Cognitive behavioral therapy (CBT) has demonstrated benefit in improving coping strategies and functional outcomes. Graded exercise therapy involves carefully structured and progressive increases in physical activity to avoid the “push-crash” cycle of overexertion followed by post-exertional malaise. Activity pacing combines controlled activity scheduling with behavioral strategies. Sleep hygiene and, when indicated, sleep studies may also be helpful.
Complementary therapies such as massage, relaxation techniques, yoga, tai chi, and healing touch may provide symptomatic relief for some patients. Frequent follow-up with a multidisciplinary healthcare team is recommended.
Prognosis varies widely. Time to diagnosis is often prolonged, averaging approximately five years. Symptomatic improvement occurs in 6–63% of patients, while complete resolution is reported in 0–37% of cases.
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Emergency And Acute Medicine – Retinal Detachment
Retinal detachment occurs when the sensory retina separates from the underlying retinal pigment epithelium, disrupting photoreceptor function and threatening permanent vision loss. There are three main types with a common final pathway of retinal separation: rhegmatogenous, tractional, and exudative. Rhegmatogenous retinal detachment (RRD) is the most common and results from a retinal break or tear that allows vitreous fluid to enter the subretinal space. It is typically an acute event and often associated with flashes of light from traction on retinal nerve fibers and floaters from associated vitreous hemorrhage. Tractional retinal detachment (TRD) occurs when fibrous vitreous bands contract and pull the retina away, usually as a chronic, progressive process related to prior pathology. Exudative retinal detachment (ERD) results from accumulation of subretinal fluid without a retinal tear and is often secondary to systemic or inflammatory disease; it usually does not require surgical repair.
Risk factors for RRD include myopia, prior cataract surgery, trauma, connective tissue disorders such as Marfan syndrome, and degenerative changes in the vitreous or retina. TRD is commonly associated with proliferative diabetic retinopathy, vasculopathies, penetrating trauma, retinopathy of prematurity, sickle cell disease, and chronic inflammatory processes. ERD is often caused by malignant hypertension, preeclampsia, intraocular tumors such as melanoma or retinoblastoma, and inflammatory conditions including posterior scleritis or Harada disease.
Patients typically present with painless visual disturbances. Common symptoms include flashes of light (photopsias), new floaters, and a progressive “curtain” or “veil” descending across the visual field. Visual loss often begins peripherally and advances centrally if untreated. Visual acuity may initially remain normal if the macula is spared. History should focus on onset, progression, prior eye disease, surgery, trauma, and systemic conditions.
Physical examination begins with assessment of visual acuity and visual fields before dilation. A field defect usually corresponds to the opposite side of the detachment. An afferent pupillary defect may be present in extensive detachments. Loss of the red reflex may be noted. Fundoscopic examination may reveal a pale, elevated, wrinkled retina; however, fundoscopy alone is insufficient to rule out detachment. Slit-lamp examination may reveal anterior vitreous pigment granules, known as “tobacco dust,” which strongly suggests a retinal tear. Intraocular pressure is often lower in the affected eye. Ocular ultrasound performed by trained emergency physicians is highly sensitive and can confirm the diagnosis when visualization is limited.
The differential diagnosis includes central retinal artery occlusion, central retinal vein occlusion, vitreous hemorrhage, migraine with aura, choroidal detachment, toxic exposures such as methanol poisoning, and other retinal or central nervous system pathology. A thorough neurologic examination is important to exclude cerebrovascular events when symptoms are atypical.
Management in the emergency setting includes placing the patient at bed rest and positioning with the side of the detachment dependent, which may help limit progression. Emergent ophthalmology consultation is required. Detachments involving the macula require surgical repair within 24 hours to optimize visual outcomes. Chronic detachments may be repaired on a less urgent timeline based on ophthalmologic assessment. Exudative detachments are treated by addressing the underlying systemic condition.
Early recognition of retinal tears allows prophylactic intervention and may prevent progression to full detachment. The presence of “tobacco dust” carries a high risk of retinal tear. Clinicians must also avoid missing central retinal artery occlusion, which carries an increased risk of stroke in patients with carotid or cardioembolic disease. Prompt diagnosis and referral are essential to preserve vision.
Retinal detachment occurs when the sensory retina separates from the underlying retinal pigment epithelium, disrupting photoreceptor function and threatening permanent vision loss. There are three main types with a common final pathway of retinal separation: rhegmatogenous, tractional, and exudative. Rhegmatogenous retinal detachment (RRD) is the most common and results from a retinal break or tear that allows vitreous fluid to enter the subretinal space. It is typically an acute event and often associated with flashes of light from traction on retinal nerve fibers and floaters from associated vitreous hemorrhage. Tractional retinal detachment (TRD) occurs when fibrous vitreous bands contract and pull the retina away, usually as a chronic, progressive process related to prior pathology. Exudative retinal detachment (ERD) results from accumulation of subretinal fluid without a retinal tear and is often secondary to systemic or inflammatory disease; it usually does not require surgical repair.
Risk factors for RRD include myopia, prior cataract surgery, trauma, connective tissue disorders such as Marfan syndrome, and degenerative changes in the vitreous or retina. TRD is commonly associated with proliferative diabetic retinopathy, vasculopathies, penetrating trauma, retinopathy of prematurity, sickle cell disease, and chronic inflammatory processes. ERD is often caused by malignant hypertension, preeclampsia, intraocular tumors such as melanoma or retinoblastoma, and inflammatory conditions including posterior scleritis or Harada disease.
Patients typically present with painless visual disturbances. Common symptoms include flashes of light (photopsias), new floaters, and a progressive “curtain” or “veil” descending across the visual field. Visual loss often begins peripherally and advances centrally if untreated. Visual acuity may initially remain normal if the macula is spared. History should focus on onset, progression, prior eye disease, surgery, trauma, and systemic conditions.
Physical examination begins with assessment of visual acuity and visual fields before dilation. A field defect usually corresponds to the opposite side of the detachment. An afferent pupillary defect may be present in extensive detachments. Loss of the red reflex may be noted. Fundoscopic examination may reveal a pale, elevated, wrinkled retina; however, fundoscopy alone is insufficient to rule out detachment. Slit-lamp examination may reveal anterior vitreous pigment granules, known as “tobacco dust,” which strongly suggests a retinal tear. Intraocular pressure is often lower in the affected eye. Ocular ultrasound performed by trained emergency physicians is highly sensitive and can confirm the diagnosis when visualization is limited.
The differential diagnosis includes central retinal artery occlusion, central retinal vein occlusion, vitreous hemorrhage, migraine with aura, choroidal detachment, toxic exposures such as methanol poisoning, and other retinal or central nervous system pathology. A thorough neurologic examination is important to exclude cerebrovascular events when symptoms are atypical.
Management in the emergency setting includes placing the patient at bed rest and positioning with the side of the detachment dependent, which may help limit progression. Emergent ophthalmology consultation is required. Detachments involving the macula require surgical repair within 24 hours to optimize visual outcomes. Chronic detachments may be repaired on a less urgent timeline based on ophthalmologic assessment. Exudative detachments are treated by addressing the underlying systemic condition.
Early recognition of retinal tears allows prophylactic intervention and may prevent progression to full detachment. The presence of “tobacco dust” carries a high risk of retinal tear. Clinicians must also avoid missing central retinal artery occlusion, which carries an increased risk of stroke in patients with carotid or cardioembolic disease. Prompt diagnosis and referral are essential to preserve vision.
