目的：避免胎头高浮者剖宫产术中娩头困难的发生，减少新生儿产伤和窒息。
Objective: To avoid difficult high position fetal head during cesarean section and reduce the neonatal asphyxias and birth injuries.
射频毁损术会并发轻微气胸、血胸、肺部感染，极少数严重者可出现咯血、窒息死亡等。
PRFA's complications included: pneumothorax, hemothorax, pneumonia, hemoptysis and suffocation or even death.
实践证明，气管切开术优于气管插管术，因为插管可加重呼吸困难，有时甚至导致窒息。
Our clinical practice proves that tracheostomy, generally speaking, is better than endotracheal intubation for the latter would aggravate the dyspnea and sometimes could even lead to asphyxia.
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