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Oxygen desaturation with different preoxygenation techniques

Mean times to reach percentage decrease in hemoglobin saturation during apnea after three different preoxygenation techniques (four breaths, normal breathing, eight deep breaths).

SpO₂: oxygen saturation from pulse oximetry.

From: Baraka AS, Taha SK, Aouad MT, et al. Preoxygenation: comparison of maximal breathing and tidal volume breathing techniques. Anesthesiology 1999; 91:612. Copyright © 1999 American Society of Anesthesiologists. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.

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