Chapter 12AntepartumHemorrhage
Chapter 12 AntepartumHemorrhage
一.Placenta PreviaDefinition:After28 pregnant weeksplacentalimplantation over the cervical os or inthe lower uterine segment
一 . Placenta Previa Definition ： After 28 pregnant weeks placental implantation over the cervical os or in the lower uterine segment
Etiology : The cause of placentaprevia remains unclear. but possi-ble etiologic factors.as1,poorlyvascularizedendometrium2、largeplacenta.3Abnormalplacenta4,placentaimplantedin theloweruterine segment
Etiology ： The cause of placenta previa remains unclear . but possible etiologic factors. as 1、poorly vascularized endometrium. 2、large placenta. 3、Abnormal placenta 4、placenta implanted in the lower uterine segment
Classification1、 cmplete placenta previa.2、partialplacenta previa3、marginal placenta previa
Classification 1、cmplete placenta previa. 2、partial placenta previa 3、marginal placenta previa
Clinical manifeslation1、symptoms:sudden painless vaginalbleeding ,bleeding results fromdetachment of placental tissueas the lower uterine lengthensand the subsequent Inability
Clinical manifeslation 1、symptoms： sudden painless vaginal bleeding ,bleeding results from detachment of placental tissue as the lower uterine lengthens and the subsequent Inability