A 5-year-old boy from rural Bihar is brought to the eye clinic with a 1-month history of difficulty seeing in dim light and recurrent eye infections. On slit-lamp examination, there is a triangular, pearly-white foamy patch on the temporal conjunctiva, and the cornea appears clear. Serum retinol is 12 µg/dL. The child's mother reports he has been eating a diet poor in leafy vegetables and dairy products for the past 6 months. What is the most appropriate immediate management?

Explanation

## Management of Vitamin A Deficiency — Xerophthalmia **Key Point:** According to WHO guidelines, the standard treatment for xerophthalmia (including Bitot's spots, X1B stage) in children ≥1 year is **oral or intramuscular vitamin A 200,000 IU** given on Day 1, Day 2, and Day 14. The **immediate** dose is 200,000 IU — and when the child can take oral medication, the oral route is preferred; however, the WHO-recommended schedule is **three doses of 200,000 IU** (not a prolonged daily-then-weekly regimen). ### This Patient's Stage - Night blindness (earliest sign) ✓ - Bitot's spots (foamy, triangular, temporal conjunctiva) ✓ - Clear cornea (no xerosis, ulceration, or scarring) ✓ - Serum retinol 12 µg/dL (deficient; normal >20 µg/dL) ✓ - **Diagnosis: Stage X1B xerophthalmia** ### WHO Recommended Dosing for Vitamin A Deficiency (Children ≥1 year) | Timing | Route | Dose | |--------|-------|------| | **Day 1 (immediately)** | Oral or IM | 200,000 IU | | **Day 2** | Oral or IM | 200,000 IU | | **Day 14 (2 weeks later)** | Oral or IM | 200,000 IU | The **most appropriate immediate management** is a **single dose of 200,000 IU vitamin A** given right away. When the oral route is available and the child can swallow, oral is preferred; when oral is not feasible (vomiting, malabsorption, severe illness), **intramuscular (IM) vitamin A 200,000 IU** is given as the immediate dose. **Option A (IM vitamin A 200,000 IU as a single dose)** best represents the correct immediate intervention among the choices given. The IM route is appropriate for immediate repletion, especially in a child with active xerophthalmia and documented deficiency, and 200,000 IU is the correct dose per WHO guidelines. **Clinical Pearl:** The WHO does NOT recommend a regimen of "200,000 IU daily for 2 weeks, then weekly for 2 weeks" (Option D) — this schedule is not part of standard WHO/ICMR xerophthalmia treatment guidelines. The correct WHO schedule is three doses of 200,000 IU on Day 1, Day 2, and Day 14. **High-Yield:** - **Night blindness reverses within 24–48 hours** of starting vitamin A therapy - **Bitot's spots resolve within 1–2 weeks** - **Corneal scarring (X3B) is irreversible** — prevention is critical - **Option B (IV 500,000 IU daily × 3 days)** is incorrect — IV route is not standard, and 500,000 IU daily is toxic - **Option C (topical vitamin A drops)** is not the treatment for systemic vitamin A deficiency - **Option D** describes a non-standard, fabricated dosing schedule **Reference:** WHO/UNICEF/IVACG Task Force. *Vitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia*, 2nd ed. Geneva: WHO, 1997. Also: Park's Textbook of Preventive and Social Medicine, 26th ed.