A 34-year-old man with tophaceous gout started allopurinol 6 weeks ago. He now presents with fever, painful erythematous macules coalescing into flaccid bullae, positive Nikolsky sign, painful oral erosions, purulent conjunctivitis, and genital denudation. Histology shows full-thickness keratinocyte apoptosis with subepidermal split. Approximately 22% of body surface area shows epidermal detachment. Which of the following management approaches, as indicated by **B** in the diagram, represents the standard-of-care initial management for this patient?

Question

Accepted Answer

C. Immediately discontinue allopurinol, transfer to a burn ICU, calculate SCORTEN score within 24 hours, and provide aggressive supportive care with fluid resuscitation and wound care. ## Why option B (index 1) is correct

The patient presents with Stevens-Johnson Syndrome/Toxic Epidermal Necrolysis (SJS/TEN) overlap syndrome (22% BSA detachment falls in the 10–30% overlap zone), triggered by allopurinol. The pathogenesis involves CD8 cytotoxic T-cell-mediated keratinocyte apoptosis driven by granulysin and FasL, often associated with HLA-B*58:01 in allopurinol-exposed patients. According to the Bastuji-Garin SCORTEN criteria and UK BAD 2016 guidelines, the immediate management (option B) mandates: (1) **immediate discontinuation** of the offending drug (allopurinol) — every day of delay increases mortality; (2) **transfer to a burn ICU** for specialized care and monitoring; (3) **calculation of SCORTEN score** within 24 hours and again at 72 hours to stratify mortality risk (7 parameters: age >40, malignancy, HR >120, BSA detached >10%, BUN >28 mg/dL, glucose >252, bicarbonate <20); and (4) **aggressive supportive care** including fluid resuscitation at approximately ⅔ of Parkland formula, warm environment, non-adherent dressings, avoidance of debridement of still-adherent skin, early ophthalmology consult, nutritional support, and DVT prophylaxis. This approach directly addresses the life-threatening nature of SJS/TEN overlap and prevents progression to full TEN.

## Why each distractor is wrong

- **Option A (Continue allopurinol and add topical steroids)**: Continuing the offending drug is contraindicated and will worsen the condition; topical steroids alone are insufficient for SJS/TEN overlap. Delayed drug withdrawal significantly increases mortality.
- **Option C (Prophylactic antibiotics and oral steroids only)**: Prophylactic systemic antibiotics are not recommended in SJS/TEN (they increase infection risk without benefit); oral corticosteroids alone are insufficient and do not address the need for ICU-level care, SCORTEN calculation, or fluid resuscitation. This approach underestimates disease severity.
- **Option D (Outpatient management with antihistamines)**: With 22% BSA detachment, positive Nikolsky sign, oral erosions, conjunctivitis, and genital denudation, this patient requires ICU-level care. Outpatient management with antihistamines is dangerously inadequate and will result in preventable mortality.

**High-Yield:** SJS/TEN is a medical emergency requiring immediate drug withdrawal, ICU transfer, SCORTEN calculation, and aggressive supportive care—not continuation of the offending agent or outpatient management.

[cite: Bastuji-Garin SCORTEN, J Invest Dermatol 2000; UK SJS/TEN Guidelines (BAD) 2016; Wang et al. Etanercept RCT, J Clin Invest 2018]

Answer

A. Start prophylactic systemic antibiotics and oral corticosteroids while monitoring the patient in the general ward

Answer

B. Continue allopurinol and initiate high-dose topical corticosteroids to suppress the inflammatory response

Answer

D. Manage as an outpatient with antihistamines and topical emollients, with close follow-up in 48 hours

Explanation

Why option B (index 1) is correct

Why each distractor is wrong

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