Preoxygenation in parturients: a comparison of 4, 6 and 8 vital capacity breaths to 5 minutes of tidal volume breathing.
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).
Chin
E Y
EY
Department of Anaesthesia, Kandang Kerbau Hospital, Singapore.
Chan
S Y
SY
Yip
Y Y
YY
Chong
J L
JL
D000328:Adult; D005260:Female; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D008176:Lung Volume Measurements; D010100:Oxygen / Q000097:blood*; D010313:Partial Pressure; D011247:Pregnancy; D012119:Respiration / Q000502:physiology*; D013990:Tidal Volume / Q000502:physiology*; D014797:Vital Capacity
D010100:Oxygen