羊水过少症在临床上較羊水过多症为少見,产前檢查时,診断較为困难,容易疏忽,因而发現率較低。一般认为羊水少于500毫升者被称为羊水过少症,而我們在过去临床观察中,常有少至数十毫升者。羊水过少症通常在分娩期才被发現,常由于发現不及时,处理較迟緩,而引起胎儿在子宫内窒息,严重者胎儿娩出后即死亡,輕者因吸入多量混浊之羊水,可致新生儿吸入性肺炎。分娩时羊水过少引起胎儿窒息的原因在(?)研究工作中曾指出:臍靜脉的血压在陣縮間歇时通常等于50-60厘米(水柱)。在第一产程中陣縮期間,臍靜脉血压常于50-90- Oligohydramnios is more clinically rare than polyhydramnios, prenatal examination, the diagnosis is more difficult, easy to neglect, and thus found a lower rate. Generally considered less than 500 ml amniotic fluid is called oligohydraemia, and we in the past clinical observation, often as few as tens of milliliters. Oligohydramnios usually found only in childbirth, often found not timely, handling more slowly, causing the fetus in the uterus asphyxia, severe cases of fetal death after delivery, the light due to inhalation of large amounts of cloudy amniotic fluid, May cause neonatal aspiration pneumonia. Causes of fetal oligohydramnios as a result of oligohydramnios during childbirth It has been pointed out in the research work (?) That the blood pressure of the umbilical vein is usually equal to 50-60 cm (water column) at intermittent constrictions. During the first stage of labor scoliosis, umbilical blood pressure often in 50-90-