Objective: To compare the pregnancy outcomes of placenta previa [PP] between primigravidas and multiparae women.

Materials and Methods: A retrospective cohort study was conducted in 335 pregnant women who delivered by cesarean section [CS] due to PP in Rajavithi Hospital between January 2010 and April 2017. The study group (n = 97) were the women with PP in primigravidas while the control group (n = 238) comprised of multiparae. Pregnancy outcomes between the two groups were compared regarding: gestational age [GA] at delivery, antepartum hemorrhage, maternal readmission, CS status, operative blood loss, postpartum hemorrhage [PPH], peripartum hysterectomy, blood transfusion, placenta accreta, preterm delivery, infant birth weight, intrauterine growth restriction [IUGR], Apgar score at 1 and 5 minutes, birth asphyxia, neonatal intensive care unit [NICU] admission, maternal and neonatal mortality.

Results: The primigravidas women had significantly less operative blood loss and PPH than the multiparae. The rates of placenta accreta and peripartum hysterectomy were significantly higher in the multiparae than the primigravidas. Neonatal outcomes were not statistically different between the groups.

Conclusion: PP in primigravidas have better maternal outcomes in term of operative blood loss and PPH. These findings may assist the clinicians in counselling and managing the pregnant women with PP.

Keywords: Primigravida, Placenta previa, Intraoperative blood loss