The World Health Organization(WHO)defines the second stage of labor as the period of time between the complete expansion of the cervix and the delivery of the fetus,also known as the fetal delivery period.During this perid the mother appears involuntary breath-holding force and delivers the fetus,which is an important stage of labor management.Even if the first stage of labor is smooth,the situation of the fetus and the mother may change rapidly in the second stage of labor,mainly manifested by failure of rotation and descent of the anterior part,prolonged and stagnation of labor,followed by a caesarean section,an increased rate of vaginal midwifery,which significantly increases the risk of postpartum hemorrhage,and birth canal injury.Therefore,the study of the second stage of labor has always been the focus of the field of obstetrics.Accurate recognition of the changes in descent mode of fetus is of great sinificance for evaluating the progress of second stage of labor,making good judgment and giving corresponding interventions.
关键词
第二产程/头盆不称/胎头下降停滞
Key words
the second stage of labor/cephalopelvic disproportion/arrest of descent
维普
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