A 3-year-old child from rural Maharashtra presents with night blindness, Bitot's spots on the conjunctiva, and corneal haziness. Serum retinol is 15 µg/dL (normal >20 µg/dL). The child is malnourished with a weight-for-age of 60%. What is the most appropriate immediate management?

Explanation

## Clinical Context This child has clinical and biochemical evidence of **vitamin A deficiency** with corneal involvement (corneal haziness = corneal scarring risk). The WHO protocol for severe deficiency with ocular signs mandates urgent, high-dose supplementation to prevent irreversible blindness. ## Management Algorithm ```mermaid flowchart TD A[Vitamin A deficiency with corneal signs]:::outcome --> B{Corneal involvement?}:::decision B -->|Yes: haziness/ulceration| C[High-dose vitamin A immediately]:::action B -->|No: night blindness only| D[Standard dosing regimen]:::action C --> E[200,000 IU day 1, day 2, day 8]:::action D --> E E --> F[Prevent corneal scarring & blindness]:::outcome ``` ## Key Point: **WHO/UNICEF protocol for severe vitamin A deficiency with corneal involvement:** - Day 1: 200,000 IU orally (or IM if vomiting) - Day 2: 200,000 IU orally - Day 8 (or 1–4 weeks later): 200,000 IU orally - High-dose regimen reduces mortality by ~12% and prevents corneal scarring ## Rationale **Vitamin A** is essential for: - Rhodopsin synthesis (night vision) - Epithelial cell differentiation (corneal integrity) - Immune function Corneal haziness indicates **active corneal damage**. Delaying treatment risks permanent scarring and blindness. The 200,000 IU dose is **not toxic** in deficiency states (toxicity threshold is >100,000 IU daily for weeks in replete individuals). ## Clinical Pearl: **Bitot's spots** (foamy, triangular conjunctival patches) are pathognomonic for vitamin A deficiency and indicate keratinization of conjunctival epithelium — an early sign before corneal involvement. ## High-Yield: - Vitamin A deficiency is the **leading preventable cause of childhood blindness** in developing countries. - Corneal signs (haziness, ulceration, scarring) are **irreversible** if not treated urgently. - Supplementation must begin **immediately** upon clinical suspicion; do not wait for lab confirmation in symptomatic cases. [cite:Park 26e Ch 10]