The most common causes of subinvolution are:
1. postpartum hemorrhage and infection.
2. multiple gestation and postpartum hemorrhage.
3. uterine tetany and overproduction of oxytocin.
4. retained placental fragments and infection.
4
1. Incorrect. Subinvolution may be caused by infection and may result in hemorrhage.
2. Incorrect. Multiple gestation may cause uterine atony resulting in postpartum hemorrhage.
3. Incorrect. Uterine tetany and overproduction of oxytocin do not cause subinvolution.
4. Correct. Subinvolution is the failure of the uterus to return to a nonpregnant state. The most common causes of subinvolution are retained placental fragments and infection.
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