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羊水系由母儿间隙通过胎盘组织层透析而来,因此羊水与母儿细胞外液处于等渗状态,其他转换途径是胎尿排泄。胎儿近足月时估计每天产生600～800ml尿液,其中一半随同羊水被胎儿吞咽,胎儿肺泡的巨大毛细血管床每天可回收相当量的羊水,如先天性泌尿系疾病,双肾有梗阻畸形则影响胎尿排出,临床表现为羊水过少;先天性胃肠道闭锁以及支气管发育不全、鼻咽畸胎瘤、膈疝以及神经管缺陷,则影响羊水内吸收,临床表现为羊水过多。
Amniotic fluid from the gap between the mother and child through the placental tissue dialysis, so the amniotic fluid and maternal and fetal extracellular fluid in an isotonic state, the other conversion pathway is urinary excretion. Fetal near full moon is estimated to produce 600 ~ 800ml of urine a day, of which half with the amniotic fluid swallowed by the fetus, a huge fetal bronchial alveolar capillary bed per day can recover a considerable amount of amniotic fluid, such as congenital urinary tract disorders, kidney obstruction Affect the discharge of fetal urine, clinical manifestations of oligohydramnios; congenital gastrointestinal atresia and bronchiectasis, nasopharyngeal teratoma, diaphragmatic hernia and neural tube defects, then affect the amniotic fluid absorption, the clinical manifestations of polyhydramnios.