## Difficult Airway Society Algorithm — Anticipated Difficult Airway **Key Point:** When difficulty is ANTICIPATED preoperatively, the DAS algorithm mandates maintaining spontaneous ventilation during induction to preserve the patient's own airway reflexes and allow spontaneous breathing if intubation fails. ### Core Principle of DAS Algorithm The algorithm is built on the concept of **avoiding apnea** — the patient must be able to breathe spontaneously if intubation attempts fail. ### Initial Management for Anticipated Difficult Airway | Step | Action | Rationale | |------|--------|----------| | 1 | Maintain spontaneous ventilation | Preserve airway reflexes; allow breathing if intubation fails | | 2 | Awake fiberoptic intubation (preferred) | Safest option; maintains airway control under patient's own breathing | | 3 | If refusing awake technique | Induction with spontaneous ventilation + backup plan | | 4 | Avoid rapid sequence induction (RSI) | RSI causes apnea — dangerous if intubation fails | **High-Yield:** The DAS algorithm's cardinal rule is **"never make an apneic patient apneic."** Spontaneous ventilation must be maintained until airway is secured. ### Sequence for Anticipated Difficulty 1. Awake fiberoptic intubation (gold standard) 2. If patient refuses: induction with spontaneous ventilation (e.g., sevoflurane inhalational induction) 3. Maintain ability to oxygenate and ventilate throughout 4. Have backup plan (Plan B, C, D) ready **Clinical Pearl:** Rapid sequence induction is contraindicated in anticipated difficult airway because it removes all safety margins — the patient becomes apneic, and if intubation fails, there is no spontaneous breathing to fall back on. **Warning:** Cricoid pressure (Sellick maneuver) is no longer recommended in difficult airway management as it may worsen visualization and impede rescue ventilation. 
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