During awake fiberoptic intubation in a 68-year-old woman with limited mouth opening and suspected epiglottitis, the operator encounters difficulty advancing the scope. Which is the most common site of obstruction?

Explanation

## Most Common Site of Obstruction During Awake Fiberoptic Intubation **High-Yield:** The epiglottis is the most common anatomical site where the fiberoptic scope encounters obstruction or difficulty during awake intubation, particularly in patients with epiglottitis, large epiglottis, or omega-shaped epiglottis. ### Anatomical Considerations ```mermaid flowchart TD A[Fiberoptic scope advancement]:::action --> B{Anatomical landmark encountered}:::decision B -->|Epiglottis blocks view| C[Most common obstruction site]:::outcome B -->|Arytenoids in way| D[Less common, lateral positioning helps] B -->|False cords prominent| E[Rare, usually can navigate around] B -->|Vallecula pooling| F[Saliva/secretions, not true obstruction] C --> G[Lift epiglottis with scope tip or use straight blade technique]:::action ``` ### Why Epiglottis Is Most Commonly Obstructive 1. **Anatomical position:** The epiglottis lies directly in the midline path of scope advancement 2. **Size variation:** Large, redundant, or omega-shaped epiglottis increases obstruction risk 3. **Inflammation:** In epiglottitis, edema and swelling make it more prominent and rigid 4. **Scope trajectory:** The straight path of the fiberoptic scope naturally encounters the epiglottis before the vocal cords ### Techniques to Overcome Epiglottic Obstruction | Technique | Description | Indication | |---|---|---| | **Epiglottic lift** | Use scope tip to gently lift epiglottis anteriorly | Standard approach; allows visualization of cords | | **Straight blade assist** | Use laryngoscope blade to elevate epiglottis | Difficult anatomy; limited scope maneuverability | | **Lateral approach** | Angle scope laterally to bypass epiglottis | Massive epiglottis; omega-shaped variant | | **Retrograde technique** | Pass guide wire from below, thread scope over it | Severe obstruction; last resort | **Clinical Pearl:** In epiglottitis, the epiglottis is swollen, stiff, and may not lift easily. Gentle manipulation and patience are essential; aggressive lifting risks mucosal trauma and bleeding. **Key Point:** The epiglottis is NOT a true obstruction but rather an anatomical landmark that must be navigated. Unlike stenosis or foreign body, it can be displaced with the scope tip.