第七版妇产科--第十三章羊水量异常（The seventh edition of Obstetrics and Gynecology - the thirteenth chapter of amniotic fluid volume abnormality）.doc

第七版妇产科--第十三章羊水量异常（The seventh edition of Obstetrics and Gynecology - the thirteenth chapter of amniotic fluid volume abnormality） The first section of polyhydramnios Normal pregnancy when the amniotic fluid volume with gestational weeks increased, the last 2 - 4 weeks decreased gradually. The full-term pregnancy amniotic fluid volume is about 800ml, where more than any period of amniotic fluid volume (Ol, called 200 pregnancy polyhydramnios (polyhp% h), up to 200GOml. The incidence of polyhydramnios, as reported by a O 5% 1%. with gestational diabetes, its incidence is as high as 20%. Too much amniotic fluid appearance, amniotic fluid character and normal person is not strange. Twin pregnancy and one fetus may occur polyhydramnios. [] causes through radioactive tracer determination that amniotic fluid turbulence, in a continuous exchange between mother and fetus. Keep dynamic balance. Fetal swallowing, breathing, urination through transformation and keratinized skin, umbilical cord before. A full-term pregnancy fetal urine volume? 43nil / h, 24 hours 450m [when swallowing amniotic fluid, amniotic fluid exchange loses balance, appear abnormal amniotic fluid volume. The exact cause of polyhydramnios is unclear, clinical in the following situations. 1 fetal malformation polyhydramnios in pregnant women, about 18% to 40% with fetal malformations, with neural tube defects of the most common diseases accounted for 50%. In anencephaly, encephalocele and spina bifida fetus are menings bare, choroidal tissue proliferation, exudate increased, resulting in polyhydramnios. Anencephaly and severe hydrocephalus, lack of central swallowing function, without swallowing reflex and urine volume increased hydramnions antidiuretic hormone deficiency; followed by a tract malformation accounted for about 25%, mainly for the esophagus or intestine closed Yan, can lead to excessive accumulation of amniotic fluid by amniotic fluid. Multifetal pregnancy more than 2 pregnancies complicated by