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
[{'content': 'Atonic uterus contraction seen in all EXCEPT \nSelect and explain. \nA. Multiparity, B. IUGR, C. Polyhydramnios, D. Prolonged labour', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (IUGR): (213, 410-11- Dutta 7th edition)Atonicity of the uterus is the commonest cause of post partum haemorrhage (80%)Causes of PPH* Atonic Uterus (80%)* Traumatic (20%)- Grand multipara* Retained tissues (Bits of placenta, blood clots causes PPH due to imperfect uterine retraction)- Over distension of the uterus- Malnutrition and anaemia- APH* Drugs - tocolytic drugs (ritodrine) MgSO4, Nifedipine- Prolonged labour- Anaesthesia* Blood coagulation disorders - are abruptio placetae, Jaundice in pregnancy, Thrombo cytopenic purpura, HELLP syndrome or in IUD- Indication or augmentation of delivery by oxytocin- Malformation of the uterus- Uterine fibroid- Mismanaged third stage of labour- Placenta (accreta, percreta) constriction ring uterus- Precipitate labourPPH is due to uterine atony during labour in polyhydromnios (213-Dutta 7)', 'role': 'assistant'}]