This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
Most common cause of postpartum haemorrhage (PPH) is 
Select and explain. 
A. Atonic uterus, B. Cervical tears, C. Episiotomy wound, D. Vaginal tears
A: Atonic uterus
Answer: A: Atonic uterus 
Explanation: Ans. a (Atonic uterus). (Ref. Textbook of Obstetrics by Dutta, 3rd ed., 424)*Most Common Cause Of Primary PPH is atonicity of the uterus (80%)*Most Common Cause Of secondary PPH is retained bits of cotyledon or membrane.RISK FACTORS FOR POSTPARTUM HEMORRHAGE# Multiple Gestations# Large baby# Polyhydramnios# Multiparity (particularly grand multiparity, more than 5 term pregnancies)# Prolonged labor (uterine inertia)# Labor augmented with Pitocin# General Anesthesia# Placenta Previa# Abruptio Placentae# Magnesium Sulfate infusion