PREOXYGENATION
When possible, preoxygenation with face
mask oxy-gen should precede all airway management inter-ventions. Oxygen is
delivered by mask for several minutes prior to anesthetic induction. In this
way, the functional residual capacity, the patient’s oxy-gen reserve, is purged
of nitrogen. Up to 90% of the normal FRC of 2 L following preoxygenation is
filled with O 2. Considering the normal oxygen demand
of 200–250 mL/min, the preoxygenated patient may have a 5–8 min oxygen reserve.
Increasing the duration of apnea without desaturation improves safety, if
ventilation following anesthetic induction is delayed. Conditions that increase
oxygen demand (eg, sepsis, pregnancy) and decrease FRC (eg, mor-bid obesity,
pregnancy) reduce the apneic period before desaturation ensues.
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