妊娠期上尿路扩张是众所周知的。右侧较左侧显著。发生率为43-50%。由于发生率高,所以尿路扩张视作生理情况。这种生理情况事实上是不同程度的上尿路梗阻。妊娠妇女尿路动力学的研究给机械性的梗阻进一步的证据。Rubi与Sala观察到输尿管膀胱交界上15,20,25cm处的输尿管张力增加,而在距离输尿管口5,10cm处并会改变。如果当病人侧卧张力则降低。Chesley与Sloam记录妊娠晚期钠,氯的尿排出量,发现仰卧较侧卧时少。Ulmsten研究妊娠妇女输尿管蠕动5人中有3人反蠕动,另1例无蠕动记录。在两次 Upper urinary tract dilatation during pregnancy is well known. The left is significant on the right. The incidence was 43-50%. Because of the high incidence, urinary tract dilatation is considered a physiological condition. This physiological condition is in fact a variable degree of upper urinary tract obstruction. Urinary tract dynamics in pregnant women further evidence of mechanical obstruction. Rubi and Sala observed an increase in ureteral tension at the 15,20,25 cm junction of the ureter and at the 10 cm distance from the ureteral orifice 5 and would change. If the patient when the lateral tension is reduced. Chesley and Sloam recorded the third trimester sodium and chloride urinary excretion and found supine less than when lying. Ulmsten study of pregnant women with ureteral peristalsis in 5 anti-peristalsis in 5 people, the other one without peristalsis records. In twice