A 48-year-old female with severe rheumatoid arthritis and limited mouth opening (interincisor distance 2 cm) presents for emergency appendectomy. Preoperative airway assessment reveals Mallampati 4, short neck, and receding mandible. The anesthesiologist decides on awake fiberoptic intubation. After topicalization and sedation, the scope is passed and Grade 1 view of vocal cords is obtained. However, the endotracheal tube cannot be advanced through the glottis despite multiple attempts. What is the most appropriate next action?

Explanation

## Awake Fiberoptic Intubation — Tube Passage Failure **Key Point:** When the fiberoptic scope achieves excellent visualization (Grade 1) but the tube cannot advance, the problem is mechanical (tube-scope mismatch, glottic stenosis, or subglottic obstruction), not visualization. Gentle manipulation and external pressure are the first rescue maneuvers. ### Problem Identification | Finding | Interpretation | |---------|----------------| | Grade 1 view obtained | Visualization is excellent | | Tube cannot advance | Mechanical obstruction, not visualization failure | | Awake patient | Can communicate, airway reflexes intact | ### Troubleshooting Tube Passage Failure ```mermaid flowchart TD A[Scope in place, Grade 1 view]:::outcome --> B[Tube will not advance]:::outcome B --> C[Apply gentle external laryngeal pressure]:::action C --> D[Rotate tube 90° counterclockwise]:::action D --> E[Advance with gentle traction on scope]:::action E -->|Success| F[Tube through glottis]:::outcome E -->|Persistent failure| G{Suspect stenosis or web?}:::decision G -->|Yes| H[Withdraw, plan tracheostomy]:::action G -->|No| I[Smaller tube or different scope]:::action ``` **High-Yield:** Common causes of tube passage failure during awake FOI: 1. **Tube-scope diameter mismatch** → rotate tube or use smaller tube 2. **Glottic stenosis or web** → requires surgical airway 3. **Subglottic edema** → gentle pressure and rotation often succeed 4. **Arytenoid impaction** → external laryngeal pressure releases it **Clinical Pearl:** Gentle external laryngeal pressure (pushing the larynx posteriorly and laterally) is the single most effective maneuver for tube passage failure when visualization is good. Rotation of the tube 90° counterclockwise also reduces friction. **Mnemonic: ROPE** — **R**otate tube, **O**ptimize pressure (external laryngeal), **P**ull scope gently, **E**xamine for stenosis. ### Why Not Immediate Withdrawal? - The patient is awake and cooperative - Visualization is excellent - Simple mechanical maneuvers have high success - Immediate rescheduling delays emergency surgery [cite:Hagberg CA Benumof and Hagberg's Airway Management 4e Ch 10]