Abstract
Background: The hazards of aorto-caval compression by the gravid uterus in late pregnancy are well documented.The provision of left uterine displacement (LUD) has proven highly beneficial to both mother and infant. We decided to investigate the effect of a new wedge to provide left uterine displacement.Methods: 40 full-termed patients undergoing elective Caesarean section under a standardized regimen of general anesthesia were studied. We randomly divided the patients into the control group and the LUD group and assessed changes of maternal MAP and HR and infant's Apgar scores and cord blood gas analysis.Results: There were no significant differences in umbilical vein blood gas analysis, umbilical artery blood gas analysis, Apgar scores and changes of maternal heart rate between the two groups. Changes of maternal MBP in the LUD group were higher than those in the control. Regression analysis demonstrated a linear correlation between pH and BEecf pH = 0.01 x BE + 7.31, r<sup>2 </sup> = 0.42 (P < 0.005) in umbilical vein, pH = 0.01 x BE + 7.27, r<sup>2 </sup>= 0.39 ( P< 0.005) in umbilical artery.
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