[Placenta praevia/accreta and previous cesarean section. Experience of five years at the Mexico National Institute of Perinatalogy]

Abstract

Two hundred and ten cases with placenta previa, were reviewed (1989-1994). In 37 (17.6%) placenta accreta was present. From accretism cases in 26 (70.2%) only, there was the antecedent of cesarean section. Average age was 31 years; the highest risk group was 35-39 years with 26% of cases of accretism. Average parity was three, in the group of five gestaes, 33.3% developed placenta accreta. In the group without antecedent of cesarean section, accretism risk was 9.4%; with one section was 21.1%, but with two or more cesarean sections, it was 50%. In the presence of placenta previa advanced maternal age, and two or more cesarean sections, placenta accreta risk is high.