胎头吸引术最合适的负压强度为39.23～49.03ｋＰａ,如用注射器抽气,一般抽吸150～200ｍｌ空气负压即可;如用负压吸引器吸引形成负压,则需维持53.3ｋＰａ。其适应证为:①第二产程延长,常用于子宫收缩乏力;②产妇有妊娠合并症或并发症,需要缩短第二产程者;③有剖宫产史或疤痕子宫 The most suitable negative pressure intensity of fetal head aspiration 39.23 ~ 49.03kPa, such as with a syringe suction, the general suction of 150 ~ 200ml air negative pressure can be aspirated vacuum suction to create a negative pressure, you need to maintain 53.3kPa . The indications are: ① prolonged second stage, commonly used in uterine atony; ② maternal pregnancy complications or complications, need to shorten the second stage of labor; ③ have a history of cesarean section or scar uterus