Abstract
Complete reduction of uterine blood flow (UBF) results in a decline of oxygen saturation (SO2) in the fetal arterial blood. Fetal heart rate (FHR) starts to decelerate when oxygen saturation falls about 10%–15% (Kunzel et al. 1983) independent of the status of fetal oxygenation prior to the reduction of uterine blood flow. There was no critical limit of oxygen saturation for the induction of deceleration. The decrease in FHR is accompanied by a rise in blood pressure and respiratory and metabolic acidosis with considerable variability in quantity and in time (Kunzel et al. 1983).
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