A 52-year-old male with a history of ankylosing spondylitis presents for elective lumbar spine fusion. On airway assessment, he has a Mallampati score of 4, limited neck extension due to spinal fusion, and a thyromental distance of 5 cm. Induction is initiated with propofol and succinylcholine. After loss of consciousness, the anesthesiologist attempts direct laryngoscopy but encounters a Grade 3 view. Bag-mask ventilation is difficult but adequate. What is the most appropriate next step according to the Difficult Airway Algorithm?

Explanation

## Difficult Airway Algorithm — Intubation Pathway **Key Point:** When direct laryngoscopy fails but bag-mask ventilation is adequate, the algorithm mandates optimization and alternative techniques before considering emergency surgical airway. ### Situation Analysis - **Grade 3 view** = partial visualization of vocal cords (difficult but not impossible) - **Adequate bag-mask ventilation** = oxygenation and ventilation can be maintained - **Neuromuscular blockade** = patient is paralyzed and cannot spontaneously breathe ### Correct Management Sequence ```mermaid flowchart TD A[Failed DL with Grade 3 view]:::outcome --> B{BMV adequate?}:::decision B -->|Yes| C[Call for help & optimize]:::action C --> D[Reposition head, external laryngeal manipulation]:::action D --> E[Attempt with alternative device]:::action E -->|Video laryngoscope or bougie| F[Successful intubation]:::outcome E -->|Still fails| G[Consider emergency surgical airway]:::urgent B -->|No| H[Emergency surgical airway]:::urgent ``` **High-Yield:** The Difficult Airway Algorithm prioritizes: 1. **Optimization** (head position, external pressure, blade change) 2. **Alternative devices** (video laryngoscope, bougie, rigid scope) 3. **Emergency surgical airway** only when ventilation cannot be maintained ### Why This Patient Fits the Algorithm - Ankylosing spondylitis causes cervical rigidity → Grade 3 is expected - Bag-mask ventilation is adequate → **do not rush to surgical airway** - Bougie or video laryngoscope have high success rates for Grade 3 views **Clinical Pearl:** A bougie (gum elastic bougie) has ~90% success rate when vocal cords are partially visible; it is the first-line rescue device after failed DL in this scenario. [cite:American Society of Anesthesiologists Difficult Airway Algorithm 2023]