van Katwijk C, Wladimiroff J W
Department of Obstetrics and Gynaecology, Academic Hospital Rotterdam-Dijkzigt, Erasmus University, The Netherlands.
Ultrasound Med Biol. 1991;17(7):683-5. doi: 10.1016/0301-5629(91)90099-i.
The effect of maternal postural changes on the umbilical artery flow velocity waveform, fetal heart rate and maternal blood pressure was studied in 27 normal singleton pregnancies between 23 and 36 weeks of gestation. A statistically significant change in umbilical artery Pulsatility Index (PI) was established for both maternal standing to supine position (rise) and supine to standing position (drop). These PI changes were not related to gestational age. A statistically significant drop in maternal systolic blood pressure was observed from standing to supine position. The rise in umbilical PI resistance when changing from standing to supine position may be caused by the sluice flow mechanism.
在27例孕23至36周的正常单胎妊娠中，研究了母体姿势改变对脐动脉血流速度波形、胎儿心率和母体血压的影响。母体从站立位到仰卧位（上升）以及从仰卧位到站立位（下降）时，脐动脉搏动指数（PI）均发生了具有统计学意义的变化。这些PI变化与孕周无关。从站立位到仰卧位时，观察到母体收缩压有统计学意义的下降。从站立位变为仰卧位时脐动脉PI阻力的增加可能是由水闸血流机制引起的。
