OXT and pulmonary arterial hypertension: Prophylactic use of oxytocin showed a significant reduction in severe PPH compared to a placebo (52/2367 versus 87/1795; RR = 0.62, 95% CI = 0.44 to 0.87; 5 RCTs; 4162 women; heterogeneity; I2 = 0%) [29].