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  • Title: Preoxygenation in parturients: a comparison of 4, 6 and 8 vital capacity breaths to 5 minutes of tidal volume breathing.
    Author: Chin EY, Chan SY, Yip YY, Chong JL.
    Journal: Singapore Med J; 1990 Apr; 31(2):138-41. PubMed ID: 2371578.
    Abstract:
    We compared the difference in denitrogenation (by intermittent measurement of arterial tension, PaO2) in 45 parturients at term when preoxygenated with 4, 6 or 8 rapid vital capacity breaths and 5 minutes of tidal volume breathing. Oxygen, at 8 litres min-1, was delivered through a facemask via a circle absorber with a 2 litre reservoir bag. Higher PaO2 was produced with 5 minutes of tidal volume breathing. This differed significantly from the PaO2 produced by 4, 6 or 8 rapid vital capacity breaths (p less than 0.01).
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