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ModerateO&GPrimary postpartum haemorrhageuk-plab-1

A 32-year-old woman has a normal vaginal delivery but develops heavy vaginal bleeding 30 minutes later. Estimated blood loss is 900 mL, BP is 90/60 mmHg and pulse 120 beats per minute. The uterus feels boggy and enlarged on palpation. What is the most likely cause of her postpartum haemorrhage?

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