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Awake Intubation Decision

Support clinical decision-making for awake fiberoptic intubation (AFOI) when difficult airway risk may make induction unsafe. Evaluate intubation difficulty, ventilation rescue, obstruction, and consequences of failure.

Based on: DAS 2019 · ASA 2022

Input

Domain 1: Intubation difficulty

Predicted intubation difficulty

Based on LEMON findings or clinical judgment

Consider LEMON score, Mallampati class, 3-3-2 rule, external anatomy

Prior airway history

Documented experience with this patient's airway

Review prior anaesthetic records when available

Domain 2: Ventilation / rescue concern

Predicted difficult mask ventilation

Based on MOANS criteria or body habitus

Obesity, beard, edentulous, snoring / OSA, stiff lungs

Reduced oxygenation reserve

Limited margin before hypoxia becomes dangerous

SpO₂ < 94% at rest, severe obesity / OSA, significant pulmonary disease

Domain 3: Airway patency

Airway obstruction

Structural process narrowing or threatening the airway

Mass, edema, abscess, hematoma, stridor, foreign body, tracheal stenosis

Domain 4: Consequence of failure

Full stomach / aspiration risk

Risk of pulmonary aspiration if vomiting occurs at induction

Recent meal, bowel obstruction, severe GERD, emergency

Critical physiology — cannot tolerate apnea

Severe cardiopulmonary impairment where apnea is immediately dangerous

Severe pulmonary hypertension, severe right-heart failure, critical hemodynamic instability

Overview

Structured decision support for when awake intubation warrants active consideration. Evaluates four domains — intubation difficulty, ventilation rescue, airway patency, and consequence of failure — to assess whether induction may remove the margin of airway safety.

Evidence Summary

Awake intubation as a strategy

Awake intubation is not chosen because the airway is difficult in isolation. It is chosen when induction may remove the margin of safety — when losing the airway after induction could result in a situation that cannot be rescued. DAS 2019 and ASA 2022 position awake techniques as a primary strategy in high-risk airways, not only a fallback.

  • Four key domains determine whether induction is safe: intubation difficulty, ventilation rescue, airway patency, and physiologic consequence
  • High concern triggers: active obstruction, previous failed intubation, high difficulty combined with poor rescue or critical physiology
  • A single high-concern trigger is sufficient to make awake intubation the preferred strategy
  • Intermediate concern does not mandate awake intubation — it warrants explicit team discussion

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