OXT and pulmonary arterial hypertension: For the outcome PPH ≥ 1000 mL, subgroup analysis of RCTs using oxytocin 10 IU showed that oxytocin was associated with a significantly decreased risk of PPH (4 RCTs, 5199 participants, OR 0.59, 95% CI 0.41 to 0.80, Table S9).