## Most Common Complication of Awake Fiberoptic Intubation **High-Yield:** Epistaxis is the most frequent complication of awake fiberoptic intubation, occurring in 5–15% of cases when the nasal route is used. ### Mechanism of Epistaxis 1. The fiberoptic scope is passed through the nasal cavity 2. Direct mucosal trauma from the scope tip and shaft 3. Friction against nasal septum, turbinates, or adenoid tissue 4. Disruption of small nasal vessels (especially in the Kiesselbach plexus area) ### Why Epistaxis Occurs Most Frequently - **Nasal route anatomy:** The nasal passages are highly vascular with abundant small vessels - **Scope diameter:** Even a 4–5 mm scope causes mechanical trauma - **Patient factors:** Hypertension, anticoagulation, coagulopathy, or chronic rhinitis increase risk - **Operator technique:** Rough insertion or multiple attempts elevate incidence ### Prevention and Management | Preventive Measure | Rationale | |---|---| | Topical vasoconstrictor (phenylephrine/epinephrine) | Reduces mucosal blood flow | | Nasal decongestion (xylometazoline) | Shrinks turbinates, widens passage | | Lubrication with lidocaine gel | Reduces friction | | Gentle insertion technique | Minimizes mucosal trauma | | Oral route (if feasible) | Bypasses nasal vasculature entirely | **Clinical Pearl:** If epistaxis occurs, apply topical epinephrine (1:10,000) on gauze, maintain head-up position, and consider switching to the oral route or postponing the procedure if bleeding is significant. **Key Point:** Epistaxis is usually self-limited and minor, but can obscure the view and rarely cause significant blood loss or aspiration.
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