uterine atony
Pronunciation: uh-TOH-nee
Failure of the uterus to contract adequately after delivery, leading to continued bleeding from placental attachment sites.
Full Definition
Uterine atony is the most common cause of postpartum haemorrhage, characterized by the inability of the uterine muscle to contract effectively after delivery of the baby and placenta. Normal uterine contractions compress blood vessels at the placental site to achieve haemostasis. When these contractions are inadequate or absent, significant bleeding can occur. Risk factors include prolonged labor, multiple pregnancy, polyhydramnios, large baby, retained placental fragments, and certain medications. Treatment typically involves uterotonic drugs, uterine massage, and in severe cases, surgical intervention including uterine artery ligation or hysterectomy.
Usage
Usage note: Note pronunciation emphasis on second syllable; distinguish from other causes of postpartum bleeding.
In Context
- "Uterine atony was immediately recognized and treated with intravenous syntometrine." — Emergency obstetric procedure note
- "Persistent uterine atony despite medical management required surgical intervention." — Operative delivery report