What is apneic oxygenation and how is it used during emergency endotracheal intubation?

• A. Apneic oxygenation refers to oxygenation after induction only.
• B. Provide oxygen during apnea (e.g., nasal cannula at 15 L/min) to prolong safe apnea time during the intubation attempt.
• C. Use high-flow oxygen only after ventilation starts.
• D. Apneic oxygenation refers to oxygenation during active ventilation.

Answer: (B)

Apneic oxygenation is oxygen delivery during the apnea phase of intubation, used to keep the patient oxygenated even when they’re not making breaths. When you induce and paral yze a patient, they stop breathing, but oxygen can continue to reach the alveoli if you provide an ongoing source of oxygen at the airway. Delivering oxygen through a nasal cannula during this period—often at high flow, like 15 L/min or more—helps maintain the alveolar oxygen gradient and can flush dead space, effectively extending the safe time before desaturation occurs. This keeps the patient better oxygenated while you complete the intubation attempt, reducing the risk of hypoxemia during the procedure.

This is why the approach is used during apnea, not just after induction or only after ventilation begins. It’s not about active ventilation; it’s about supplying oxygen while ventilation is paused.