Abstract
The umbilical cord was double clamped from one second before to 37 seconds after birth for 30 healthy term newborn infants. Twenty-eight of these infants were born vaginally, in the cephalic presentation, and 2 were born by elective cesarean section. Up to 6 breaths occurred before clamping. The mean umbilical vein (UV) minus umbilical artery (UA) differences were: for pH, 0.10 ± 0.04; for Pco2, −17 ± 11 mm. Hg; for Po2, 14 ± 6 mm. Hg. The mean UV-UA difference for oxygen content, calculated from the Po2 difference and the hemoglobin concentration, was 7.5 ± 3.6 vol. per cent. These differences showed no tendency to decrease from birth to 37 seconds. These data indicate that placental gas exchange is just as efficient at 37 seconds after delivery as it is at birth.
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