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脐带的主要功能是输送血液,胎儿是经脐带血液与胎盘、母体进行营养及代谢物质交换的.在近足月时。从脐带通过的血流量约125ml/kg.min,脐动脉内的收缩压为8 kPα,舒张压为4 kPα,血液通过胎盘毛细血管床时压力降低,回流至脐静脉时为267kPα.当脐带异常时将干扰脐带的血液输送,影响气体及物质的交换.脐带异常在孕期无明显症状,临产后或胎膜破裂后可发生急性胎儿宫内窘迫、新生儿窒息、围产儿死亡或猝死等或导致胎儿发育异常,对此国内外均有大量报道.近期江西省妇产医院(1990)报道因脐带异常导致新生儿窒忠而死亡者占313%;北京协和医院
The main function of the umbilical cord is to deliver blood, the fetus is the exchange of nutrients and metabolites through the umbilical cord blood and placenta, the mother of the body. The blood flow from the umbilical cord is about 125 ml / kg.min, the systolic pressure in the umbilical artery is 8 kPa, the diastolic pressure is 4 kPa, the pressure decreases when the blood passes through the placental capillary bed and flows back to the umbilical vein at 267 kPa. Will interfere with the blood supply of the umbilical cord, affecting the exchange of gases and substances.Umbilical cord abnormalities during pregnancy without obvious symptoms, after labor or rupture of the membranes may occur acute fetal distress, neonatal asphyxia, perinatal death or sudden death, etc. or lead Fetal dysplasia, there are a lot of reports both at home and abroad.Recently Jiangxi Provincial Maternity Hospital (1990) reported due to abnormal umbilical cord blood caused by neonatal Zhi Zhi died of 313%; Beijing Union Medical College Hospital