Emergency intubation is not just an airway procedure.
It is a cardiopulmonary stress test.
Critically ill patients often have limited oxygen reserve, high shunt fraction, increased oxygen consumption, hemodynamic instability, and very little tolerance for apnea.
This is why preoxygenation matters.
The goal of preoxygenation is to replace alveolar nitrogen with oxygen and create an oxygen reservoir in the lungs.
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