<prompt> Most common cause of PPH is -Atonic PPHTraumatic PPHRetained tissuesBloodcoagulopathy  <response>: Ans. is a i.e., Atonic PPH o Postpartum haemorrhage - Related to the amount of blood loss in excess of 500 ml following birth of the baby WHO.Causes: Atonic Most common Traumatic Retained tissues Blood coagulopathy. Atonic uterus - Atonicity of the uterus is the most common cause of postpartum haemorrhage.o Common causes of Uterine atonicity: Grand multipara Over - distension of the uterus Malnutrition and anaemia Prolonged labour Anaesthesia Uterine fibroid - causes imperfect retraction mechanically. 