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OBG · Puerperium: subinvolution
Sample itemA woman 3 weeks postpartum has persistent bleeding with a soft, bulky, tender uterus. What is the commonest cause of subinvolution?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Retained products of conception with infection
Subinvolution is delayed return of the uterus to its non-pregnant size, usually from retained placental fragments, infection or fibroids. Treatment is ergometrine, antibiotics and evacuation if retained tissue is shown on ultrasound.
Option by option
A. Hypothyroidism
Hypothyroidism is not typical.
B. Retained products of conception with infection (correct)
Correct. Retained products and infection are the usual causes.
C. Anaemia
Anaemia does not cause subinvolution.
D. Breastfeeding
Breastfeeding actually promotes involution.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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