Correlation of placenta previa type with cesarean section blood loss and predictors of hysterectomy

摘要

To the Editor: Placenta previa is one of the main causes of bleeding in late pregnancy and childbirth. According to the relationship between the lower edge of the placenta and the internal cervix, placenta previa can be classified as incomplete placenta previa (IPP) and complete placenta previa (CPP). IPP indicates that the lower edge of the placenta reaches but does not exceed the internal cervix. CPP refers the lower edge of the placenta covering and exceeding the internal cervix. This common classification standard is applicable to cases in which the myometrium is intact and only the placenta is prepositioned. However, when a pregnant woman who has previously delivered by cesarean section presents with placenta previa in the current pregnancy, and the placenta is attached to the uterine scar, there are significant increases in the risks for post-delivery bleeding and various complications. These cases have been given a new name, pernicious placenta previa (PPP).[1]