What is uterine atony characterized by?

Uterine atony is fundamentally characterized by the inability of the uterus to contract effectively following delivery. This condition is a primary cause of postpartum hemorrhage, as a well-toned and contracting uterus is essential for controlling bleeding and expelling the remaining placenta after childbirth. When the uterus fails to contract efficiently, it can lead to excessive bleeding, highlighting the critical role of uterine muscle tone in maintaining hemostasis after delivery.

Effective contraction of the uterus is necessary to compress blood vessels and facilitate the retraction of the uterine muscle fibers. In the case of uterine atony, the lack of muscle tone disrupts this process, resulting in potential complications. While other options might mention features of postpartum complications, none accurately describe the distinctive aspect of uterine atony as the failure to contract.