A 28-year-old male factory worker presents to the emergency department 15 minutes after splashing of a chemical into both eyes while working without protective eyewear. He complains of severe ocular pain, blepharospasm, and blurred vision. On examination, the cornea appears hazy with loss of transparency, the conjunctiva is chemosed and blanched, and the anterior chamber is difficult to visualize. The patient's visual acuity is hand movements in both eyes. What is the most appropriate immediate management?

Explanation

## Immediate Management of Chemical Eye Injury **Key Point:** Chemical eye injuries are true ophthalmologic emergencies requiring immediate, aggressive irrigation — the duration and volume of irrigation are more critical than identification of the chemical agent. ### Pathophysiology Chemical burns cause injury through: 1. Direct chemical toxicity to ocular tissues 2. Osmotic damage and dehydration 3. Protein denaturation and collagen cross-linking (especially in alkali burns) 4. Continued penetration and damage even after initial contact **High-Yield:** Alkali (basic) burns are MORE destructive than acid burns because: - Alkali penetrates deeper into corneal stroma and anterior chamber - Causes saponification of lipids in cell membranes - Leads to liquefactive necrosis - Acid burns cause coagulative necrosis, which limits penetration ### Immediate Management Algorithm ```mermaid flowchart TD A[Chemical splash to eye]:::urgent --> B[Instill topical anesthetic drops]:::action B --> C[Evert lids and remove particulate matter]:::action C --> D[Irrigate with normal saline or Ringer's lactate]:::action D --> E[Continue irrigation for 15-30 minutes minimum]:::action E --> F[Check pH with litmus paper]:::action F --> G{pH normal?}:::decision G -->|No| H[Continue irrigation until pH normalizes]:::action G -->|Yes| I[Instill topical antibiotics and cycloplegic]:::action I --> J[Refer to ophthalmology urgently]:::action ``` ### Step-by-Step Protocol | Step | Action | Rationale | |------|--------|----------| | **1. Anesthesia** | Topical anesthetic (proparacaine 0.5%) | Relieves pain, allows patient cooperation for irrigation | | **2. Lid eversion** | Evert upper and lower lids | Remove embedded particles, lime, or other debris | | **3. Irrigation** | 500 mL–2 L normal saline or Ringer's lactate | Dilute and flush chemical; Ringer's lactate preferred (contains Ca²⁺ and K⁺) | | **4. Duration** | Minimum 15–30 minutes | Alkali burns may require >1 hour; continue until pH normalizes | | **5. pH check** | Litmus paper on conjunctival fornix | Target pH 7.0–7.4; if pH >8 or <6, continue irrigation | | **6. Topical therapy** | Antibiotics (moxifloxacin/ciprofloxacin) + cycloplegic (cyclopentolate 1%) | Prevent infection; reduce pain from ciliary spasm | | **7. Referral** | Urgent ophthalmology consultation | Assess anterior chamber, intraocular pressure, need for systemic therapy | **Clinical Pearl:** Do NOT delay irrigation to identify the chemical or await ophthalmology. The "golden period" is the first few minutes; every minute counts. Irrigation is both diagnostic and therapeutic. **Warning:** ~~Do not use distilled water~~ — normal saline or Ringer's lactate is preferred. Distilled water is hypotonic and may cause corneal edema. ### Why Not Immediate Corticosteroids or Pressure-Lowering? - Topical corticosteroids are given AFTER irrigation, not before - Acute pressure elevation (if present) is managed medically after stabilization - Paracentesis is not indicated in the acute phase unless there is angle-closure glaucoma [cite:Khurana Comprehensive Ophthalmology Ch 6, Yanoff & Duker Ophthalmology Ch 4]