Objective: The objective of this study was to compare the administration of oxytocin at the beginning and end of the third stage of labor for the prevention of postpartum hemorrhage. Methods: Patients with documented singleton pregnancies were randomly assigned to two groups. The first received 10 units of oxytocin intramuscularly at delivery of the anterior shoulder of the fetus and an identical appearing placebo injection following delivery of the placenta. The second received the opposite medication sequence. The study was double blinded. Blood loss was measured by weighing all fluids collected, visual estimation, and serial blood counts. Results: 27 women received oxytocin at the delivery of the fetal shoulder and 24 after the placenta. Oxytocin given after placenta delivery resulted in lower blood loss (345 vs. 400 ml, p = 0.28), lower collection bag weight (763 vs. 833 g, p = 0.55), lower change in HgB (–1.26 vs. –1.32 g, p = 0.86), lower ΔHCT (–3.43 vs. –3.64%, p = 0.85), and a shorter third stage of labor duration (8.6 vs. 9.2 min, p = 0.75). The incidence of postpartum hemorrhage, defined as estimated blood loss >500 ml (0 vs. 14.8%) was significantly lowered with oxytocin following placental delivery (p = 0.049). Conclusions: In our study, postpartum hemorrhage was less frequent when oxytocin administration was delayed until after placenta delivery.
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