Table 1.

Nadir of hypotension and bradycardia during complete umbilical cord occlusion

	Mean arterial pressure (mmHg)		Fetal heart rate (beats min–1)
	Baseline	Occlusion	Baseline	Occlusion
Control	36.2 ± 0.7	36.3 ± 0.8	190.4 ± 3.7	187.9 ± 5.1
15 min	34.8 ± 0.7	14.8 ± 1.3*	192.0 ± 3.1	82.0 ± 2.7*
25 min	36.6 ± 0.5	11.2 ± 0.7#δ	189.0 ± 2.3	57.6 ± 2.7#δ

Baseline was taken as the average of the hour preceding the start of occlusion. The final extent of hypotension and bradycardia was calculated as the average over the final minute of umbilical cord occlusion. Data are the 1 min mean ± SEM. ^* P < 0.01, 15 min vs. control; ^# P < 0.01; 25 min vs. controls; ^δ P < 0.01, 15 min vs. 25 min.