The most common cause of obstetrical hemorrhage is ___________

Uterine atony is the most common cause of obstetrical hemorrhage. Uterine atony is the failure of uterus to contract sufficiently after delivery and to arrrest bleeding from vessels at the placental implantation site. Types of PPH: Primary: Hemorrhage occuring within 24 hrs of child bih Most common cause: Atonic PPH. Secondary: Hemorrhage occuring after 24 hrs and upto 12 weeks post paum. Most common cause: Retained placenta. Causes of PPH T- Tone : Atonic PPH T- Trauma : Traumatic PPH T- Thrombin: Coagulopathy (DIC and hypofibrinogenemia) T- Tissue: Retained products of conception Ref: Williams Obstetrics 24th edition PGno: 784