A 28-year-old male factory worker presents to the emergency department 15 minutes after a splash of lime powder (calcium oxide) to his right eye. He complains of severe pain and blurred vision. On examination, the cornea appears hazy with a white opaque appearance, and conjunctival blanching is noted. The anterior chamber is clear. What is the most appropriate immediate management?

Explanation

## Immediate Management of Alkali Burns **Key Point:** Alkali burns (especially lime, ammonia, sodium hydroxide) cause liquefactive necrosis and penetrate deeper into ocular tissues than acid burns. Time is critical — immediate and prolonged irrigation is the single most important intervention. ### Why Immediate Irrigation Is Paramount Alkali ions (OH⁻) saponify lipids in cell membranes and denature proteins, causing progressive tissue destruction even after the initial insult. Continued chemical reaction within the eye can occur for hours if the alkali is not completely removed. **High-Yield:** The "golden period" for alkali burn management is the first 15–30 minutes. Irrigation should begin immediately — even before reaching the hospital if possible (first-aid measure). ### Step-by-Step Immediate Protocol 1. **Topical anesthesia** (e.g., proparacaine 0.5%) — essential to allow patient cooperation during irrigation 2. **Copious irrigation** with normal saline (or Ringer's lactate) for **at least 15–20 minutes** (some sources recommend up to 30 minutes) 3. **Evert eyelids** and sweep conjunctival fornices to remove particulate matter (lime particles, debris) 4. **Check pH** of conjunctival sac after irrigation — should return to neutral (pH 7–7.4) 5. **Remove embedded particles** carefully with a cotton-tipped applicator or fine forceps ### Grading of Alkali Burns (Roper Hall Classification) | Grade | Cornea | Conjunctiva | Prognosis | | --- | --- | --- | --- | | I | Clear | No blanching | Excellent | | II | Hazy, iris details visible | Blanching < 1/3 | Good | | III | Opaque, iris details obscured | Blanching 1/3–1/2 | Guarded | | IV | Completely opaque | Blanching > 1/2 | Poor | This patient has **Grade III** (hazy cornea with conjunctival blanching), which requires aggressive early management. **Clinical Pearl:** Conjunctival blanching indicates vascular injury and ischemia — a sign of severe alkali penetration. The extent of blanching correlates with prognosis. ### Why Other Options Are Wrong - **Topical antibiotics/lubricants alone** (Option B): Delays critical irrigation and allows continued alkali penetration. - **Observation and analgesics** (Option C): Passive management allows progressive tissue damage; alkali continues to react with tissue. - **Immediate corticosteroids** (Option D): Steroids are given *after* irrigation is complete; early steroids without irrigation are harmful and delay definitive treatment. **Warning:** Do NOT apply corticosteroids before irrigation is complete — they can worsen the burn by promoting collagenase activity and inhibiting epithelialization in the acute phase. ### Post-Irrigation Management (After This Question) Once irrigation is complete: - Topical antibiotics (moxifloxacin or gentamicin) - Lubricating drops (preservative-free) - Topical NSAIDs (diclofenac) for pain - Systemic analgesics - Tetanus prophylaxis if needed - Urgent ophthalmology referral for slit-lamp examination and further management (including delayed corticosteroids, collagenase inhibitors, and surgical intervention if needed) **Mnemonic — ALKALI BURN IMMEDIATE STEPS: AIRWAY** - **A**nesthesia (topical) - **I**rrigation (copious, 15–30 min) - **R**emove particles - **W**ash eyelids (evert and sweep fornices) - **A**ssess pH - **Y**ield to ophthalmology