Life-Threatening Dermatologic Emergencies
Critical emergency dermatology: Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN) staging, the SCORTEN prognostic score, DRESS syndrome with visceral organ damage, necrotizing soft tissue infections (LRINEC), and meningococcemia.
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Life-threatening dermatologic emergencies present with systemic toxicity and mucosal involvement. In Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), drug-induced keratinocyte apoptosis causes extensive epidermal detachment. Nikolsky sign is positive (gentle lateral pressure sloughs skin). Involve the burn center early for TEN (> 30% BSA involvement) or SJS/TEN overlap (10–30% BSA); immediately discontinue all potential culprit medications (allopurinol, antiepileptics, sulfonamides, NSAIDs). DRESS syndrome presents with facial edema, widespread morbilliform rash, fever, and eosinophilia with visceral involvement (hepatitis). In meningococcemia, purpura fulminans progresses in hours; administer IV Ceftriaxone immediately.
SJS and TEN are severe, immune-mediated mucocutaneous adverse drug reactions characterized by extensive Fas/Fas-ligand and granulysin-mediated keratinocyte apoptosis. They represent a spectrum of disease defined by the percentage of total body surface area (BSA) with epidermal detachment:
| Classification | Epidermal Detachment (% BSA) | Mucosal Involvement | Mortality Rate & Disposition |
|---|---|---|---|
| Stevens-Johnson Syndrome (SJS) | < 10% BSA detachment | >= 2 mucosal surfaces involved (eyes, oral cavity, genitalia) in > 90% | 1–5% mortality. Inpatient telemetry or specialized dermatology unit. |
| SJS / TEN Overlap | 10% to 30% BSA detachment | Bilateral conjunctivitis, painful oral erosions, hemorrhagic crusting | 10–15% mortality. Transfer to regional Burn ICU. |
| Toxic Epidermal Necrolysis (TEN) | > 30% BSA detachment (often 50–80%) | Severe multi-mucosal sloughing, respiratory tract detachment, intestinal shedding | 30–50% mortality. MANDATORY IMMEDIATE BURN CENTER TRANSFER. |
| SCORTEN Parameter (Assess at 24h of presentation) | Risk Factor Threshold | Score Point Assigned |
|---|---|---|
| 1. Age | Age >= 40 years | 1 Point |
| 2. Heart Rate | Tachycardia >= 120 beats/minute | 1 Point |
| 3. Associated Malignancy | Known active cancer / hematologic malignancy | 1 Point |
| 4. Detached / Detachable BSA | Epidermal detachment > 10% BSA at day 1 | 1 Point |
| 5. Serum Urea (BUN) | BUN > 28 mg/dL (10 mmol/L) | 1 Point |
| 6. Serum Glucose | Blood glucose > 252 mg/dL (14 mmol/L) | 1 Point |
| 7. Serum Bicarbonate | Bicarbonate < 20 mEq/L (acidosis) | 1 Point |
| Mortality Risk by SCORTEN | Score 0–1: 3.2%; Score 2: 12.1%; Score 3: 35.3%; Score 4: 58.3%; Score >= 5: 90.0% | Calculates ICU/Burn mortality |
DRESS syndrome is a delayed, severe hypersensitivity reaction typically developing 2 to 8 weeks after starting a culprit medication (most commonly Carbamazepine, Phenytoin, Lamotrigine, Allopurinol, or Sulfasalazine). It is characterized by the hallmark clinical triad: 1) Extensive morbilliform rash with facial edema; 2) Fever (> 38.5°C); 3) Internal organ involvement (hepatitis with elevated ALT in 80%, acute interstitial nephritis in 30%, myocarditis):
- Facial Edema Hallmark: Marked, symmetrical periorbital and facial edema is present in > 75% of patients with DRESS, distinguishing it from simple drug exanthems.
- Laboratory Confirmation: Absolute eosinophilia (> 700/uL or > 10% of differential) and atypical lymphocytes on peripheral blood smear.
- Emergency Treatment: 1) Immediately stop the culprit medication; 2) Administer systemic corticosteroids (Methylprednisolone 1–2 mg/kg/day IV for severe organ involvement, transitioned to oral prednisone tapered over 2 to 3 months to prevent relapses); 3) Hospital admission to monitored telemetry bed.
Meningococcemia (Neisseria meningitidis bacteremia) produces endotoxin-mediated endothelial damage, microvascular thrombosis, and acute Disseminated Intravascular Coagulation (DIC). Petechiae rapidly coalesce into painful, geographic, purple-black necrotic purpura (Purpura Fulminans) accompanied by Waterhouse-Friderichsen syndrome (bilateral adrenal hemorrhage):
Meningococcemia Antibiotic Rule: In a febrile patient with petechiae or rapidly spreading purpura, administer IV Ceftriaxone (2g IV) immediately. DO NOT DELAY ANTIBIOTICS for a lumbar puncture or CT scan. Seconds matter: patients can progress from initial fever to irreversible septic shock and limb necrosis in under 4 hours.
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