Abstract
This study compares continuously measured arterial oxygen tension (Pao2) in normal unanesthetized patients after four maximally deep breaths of 100% O2 within 30 seconds, to(Pao2) values observed after 5 minutes of spontaneously breathing 100% O2 at normal rates and tidal volumes. Mean(Pao,) after 5 minutes of O2 breathing was 350 ± 36 (SD) torr, not significantly higher (p > 0.05) than after four breaths of O2 (339 ± 34 torr). Mean arterial oxygen content was 19.6 ± 2.1 vol% in both periods. For purposes of increasing arterial oxygenation before anesthetic induction the fourbreath, 30-second technique and 5 minutes of oxygen breathing are equally effective.
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