露胎

观察两组镇痛效果，第二产程时间、胎头拔露至胎头娩出时间，会阴情况（会阴是否完整、会阴裂伤和会阴侧切）。

Analgesic effects were observed and the second stage of labor time and pull the fetal head exposed to the fetal head disengagement time , the situation perineum .

结果：胎膜早破、妊娠期高血压疾病及前置胎盘是导致早产的主要原因，而胎儿窘迫、胎盘早剥、臀先露及双胎妊娠亦是引起早产不可忽视的因素。

Results : Premature rupture of membrane , pregnancy-induced hypertension and placenta praevia were the main risk factors for premature delivery ;

胎儿异常情况：201例中脐带先露17例，胎头过度仰伸1例。

( 3 ) Condition of fetal abnormality . there were 17 cases of umbilical cord presentation , 1 case of hyperextension of the fetal head among 201 cases .

依据分娩方式和出生体重评价顶先露-非顶先露双胎中第2个娩出的新生儿的死亡率和发病率

Neonatal death and morbidity in vertex - nonvertex second twins according to mode of delivery and birth weight