Fig. 1. Box plots (median, 10th, 25th, 75th, and 90th percentiles) of peak systolic (Vsys) and end-diastolic (Vdia) flow velocities and resistance indices (RI) in the uterine artery at the peak amplitude of uterine contraction (A ) and between uterine contractions (B ). Values were obtained at baseline, immediately after administration of bolus intravenous ephedrine, and during recovery. *P < 0.05 versus baseline; #P < 0.01 versus baseline; §P < 0.05 versus ephedrine.