肩难产常常是在意想不到时突然发生,典型情况是在困难地分娩出一个大胎头之后,医生惊奇地发现他无法牵引下胎儿双肩、胎儿颈部阻于阴道口,不能见到儿颈,孩子不能呼吸,牵引胎儿和压迫宫底都没有用,情况很快变得紧急。Wood等曾报告,在婴儿头娩出和其躯干娩出的间隔时间内,脐动脉血的pH值每分钟下降0.04。肩难产需 Shoulder dystocia often occurs unexpectedly unexpectedly, typically after difficult delivery of a large fetal head, the doctor was surprised to find that he was unable to tow the fetus shoulders, the fetus neck blocked in the vaginal opening, can not see the neck, the child Can not breathe, traction fetuses and oppression palace are useless, the situation quickly became urgent. Wood et al. Reported that umbilical arterial blood had a pH drop of 0.04 per minute between the first delivery of the baby and the delivery of her torso. Shoulder dystocia needs