PPH defined as: blood loss >500 mL after vaginal delivery or >1,000 mL after cesarean delivery (ACOG), or any blood loss causing hemodynamic instability. Primary PPH occurs within 24 hours; secondary PPH at 24 hours to 12 weeks. Management: uterotonic agents (oxytocin, ergometrine, carboprost, misoprostol), bimanual compression, intrauterine balloon, surgical (B-Lynch, hysterectomy).
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