Park Y K, Hidaka A
Department of Obstetrics and Gynecology, Osaka City University Medical School.
Nihon Sanka Fujinka Gakkai Zasshi. 1991 Jun;43(6):655-62.
Pregnant women are generally recommended to rest in the left-lateral position (l-lat.) to avoid caval compression. We studied the influence of postural change from the supine position (sup.) to the l-lat. on maternal hemodynamics and tocolysis. The cardiac output (CO) was measured by impedance cardiography, while the pulsatility index of the uterine artery (PIUtA) was determined by the pulsed Doppler method. When the maternal posture was changed from sup. to l-lat, the following results were obtained. (1) The frequency of uterine contractions (UC) (preterm labor = 92) was significantly reduced (p less than 0.01). (2) The resting uterine tonus (n = 5) was also significantly decreased (p less than 0.05). (3) In the cases showing a decrease in the frequency of UC, the CO value was significantly increased (p less than 0.01), whereas PIUtA was significantly decreased (p less than 0.01). It is concluded that the postural change from sup. to l-lat. resulted in a decrease in the frequency of UC and the resting uterine tonus and at the same time an increase in the CO and decrease in the vascular resistance of the uterine artery.
一般建议孕妇采取左侧卧位休息，以避免下腔静脉受压。我们研究了从仰卧位到左侧卧位的姿势改变对母体血流动力学和宫缩抑制的影响。通过阻抗心动图测量心输出量（CO），同时通过脉冲多普勒法测定子宫动脉搏动指数（PIUtA）。当母体姿势从仰卧位变为左侧卧位时，得到了以下结果。（1）子宫收缩（UC）频率（早产 = 92例）显著降低（p < 0.01）。（2）静息子宫张力（n = 5例）也显著降低（p < 0.05）。（3）在UC频率降低的病例中，CO值显著升高（p < 0.01），而PIUtA显著降低（p < 0.01）。结论是，从仰卧位到左侧卧位的姿势改变导致UC频率和静息子宫张力降低，同时CO增加，子宫动脉血管阻力降低。
