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Effect of repeated total umbilical cord occlusions on fetal heart rate (FHR;●) and mean arterial blood pressure (MAP;○) in fetal sheep. Four five-min occlusions (I, II, III, IV) in control (A, n=7) and pre-existing hypoxia group (B, n=8). Shaded area represents the occlusion period, the periods where maxima and minima values were determined for MAP (open bars) and for FHR (solid bars) are also depicted.
