Preavalance and Rrisk Factors of Placenta Previa in Valie Asr Hospital of Zanjan

Introduction& Placenta previa is a serious complication of pregnancy and it is a considered an emergency in women's medicine, the aim of this study was to evaluate the incidence, risk factors pregnancies complicated by placenta previa. This is a retrospective study on patients files in Delivery branch of Valie Asr Hospital of Zanjan (1381-1383). The necessary information recorded in the questionnaires. 12834 pregnant women were assessed. Birth records of 93 cases with placenta previa and 940 randomly selected controls were reviewed retrospectively.Statistical analysis was performed using Pearson's Chi square Method. Placenta previa complicated 0.72% (n=93) of all deliveries included in the study (n=12834). Multiparity was more common in patients with placenta previa (P<0.001). Also the previous cesarean section, previous abortion and previous placenta previa more common in patients with placenta previa(P<0.0001). Placenta previa occurred in male infants in 62 cases (P<0.001). Fetuses with placenta previa had lower fetal weight; particularly, fetal weight less than 2500 g was a significant (P<0.0001).The newborns that were delivered after placenta previa graded lower Apgar scores less than 7 at 5 min (P<0.0001). Multiparity, previous cesarean section, previous abortion and previous placenta previa are risk factors for placenta previa.