What complication may arise if fragments of the placenta remain in the uterus post-delivery?

Retained placenta can lead to hemorrhage, which is a significant complication following delivery when fragments of the placenta remain in the uterus. The presence of retained placental tissue can prevent the uterus from effectively contracting, leading to atony (lack of tone) and subsequent excessive bleeding. Normally, after delivery, the uterus contracts to expel the placenta completely and to seal off blood vessels, thereby minimizing the risk of hemorrhage. When fragments stay behind, this contraction is impaired, and the risk of severe blood loss increases. This potential for hemorrhage is clinically significant and requires timely intervention to manage and mitigate risks for the mother.