Which of the following is the most important immediate intervention in the management of acute chemical injury to the eye?

Explanation

## Immediate Management of Chemical Eye Injury **Key Point:** The first and most critical step in chemical eye injury is immediate, copious irrigation to dilute and remove the offending chemical agent before it causes further tissue damage. ### Timeline and Rationale **High-Yield:** The "golden period" for chemical eye injury is the first few minutes. Every second of delay allows deeper penetration of the chemical agent into ocular tissues. ### Irrigation Protocol 1. **Immediate action** (at scene or ED triage) - Begin irrigation BEFORE detailed history or examination - Use any available water source (tap water, saline, bottled water) - Do NOT delay for "ideal" irrigant 2. **Duration and volume** - Minimum 15–30 minutes for acids - Minimum 30–60 minutes for alkalis (longer penetration) - Use 1–2 liters of fluid or continuous flow 3. **Technique** - Separate eyelids with fingers or lid speculum - Direct stream across cornea and conjunctiva - Irrigate fornices thoroughly (chemical may be trapped) - Continue until pH normalizes (check with pH paper) ### Management Sequence ```mermaid flowchart TD A[Chemical eye injury]:::urgent --> B[Immediate irrigation]:::action B --> C[Continue 15-60 min]:::action C --> D[Check pH with paper]:::decision D -->|pH abnormal| E[Continue irrigation]:::action D -->|pH normal| F[Remove particulate matter]:::action E --> D F --> G[Topical anesthesia]:::action G --> H[Cycloplegia + antibiotics]:::action H --> I[Assess corneal damage]:::outcome I --> J[Ophthalmology referral]:::action ``` ### Why Other Options Are NOT First-Line | Intervention | Timing | Rationale | |--------------|--------|----------| | **Irrigation** | **Immediate (0 min)** | **Removes chemical; prevents further damage** | | Topical antibiotics | After irrigation | Prevents infection; secondary priority | | Cycloplegia | After irrigation | Reduces pain and ciliary spasm; not urgent | | Pressure patching | Contraindicated | Traps chemical; worsens damage | **Clinical Pearl:** Even if the patient reports that irrigation has already begun, continue it in the ED. Chemical penetration is ongoing, and extended irrigation is never harmful. **Warning:** Do NOT patch the eye acutely in chemical injury — this traps the chemical and prevents further dilution. Patching is used only after complete irrigation and assessment. ## Post-Irrigation Management Once irrigation is complete: 1. Instill topical anesthetic (proparacaine) for comfort 2. Remove particulate matter (rust, lime, glass) with cotton swab 3. Instill cycloplegic (cyclopentolate 1%) to reduce pain 4. Start topical broad-spectrum antibiotic (chloramphenicol or ciprofloxacin) 5. Refer to ophthalmology for grading and long-term management