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双胎妊娠晚期由于子宫过度膨大，肌纤维处于高涨状态，流体静压增高导致宫颈过早成熟诱发宫缩或胎膜早破而发生早产［１］。早产儿器官发育不成熟，免疫功能欠完善，生存能力差，发病率高，死亡率高［２］。因此，预防双胎妊娠早产是降低围产儿死亡率的重要环节。我院近４年应
Twin pregnancies due to excessive uterine enlargement, muscle fibers in the state of high fluid hydrostatic pressure leading to premature ejaculation of the cervix or premature rupture of membranes occurred premature birth [1]. Premature children organ immaturity, imperfect immune function, poor viability, high incidence, high mortality [2]. Therefore, preventing prematurity of twin pregnancy is an important part of reducing perinatal mortality. My hospital should be nearly 4 years