Atonic uterus is more common in :
**Core Concept**
Atonic uterus refers to a condition where the uterus fails to contract properly, leading to difficulties in maintaining uterine tone and preventing excessive bleeding or organ prolapse. This condition is often associated with various underlying factors, including hormonal imbalances, anatomical abnormalities, or previous uterine surgery.
**Why the Correct Answer is Right**
Atonic uterus is more common in women who have undergone a previous uterine surgery, such as a cesarean section (C-section) or a hysterectomy. The surgical trauma can lead to scarring and fibrosis in the uterine tissue, resulting in weakened uterine muscles and impaired contractility. This is because the surgical incisions can disrupt the normal uterine architecture, affecting the coordination and strength of uterine contractions.
**Why Each Wrong Option is Incorrect**
**Option A:** Prolonged labor or obstructed labor can also lead to atonic uterus, but it is not the most common cause. Prolonged labor can cause uterine fatigue and subsequent atony, but it is not as directly related to surgical trauma as uterine surgery is.
**Option B:** Polyhydramnios, a condition characterized by excessive amniotic fluid, is not directly related to atonic uterus. While polyhydramnios can lead to uterine distension and potential complications, it is not a primary cause of atonic uterus.
**Option C:** Uterine fibroids can cause discomfort and bleeding, but they are not a common cause of atonic uterus. Fibroids can affect uterine function, but they are not directly related to the development of atonic uterus.
**Clinical Pearl / High-Yield Fact**
It is essential to note that atonic uterus is a potentially life-threatening condition that requires prompt medical attention. Delayed diagnosis or treatment can lead to severe complications, including hemorrhage, shock, and even maternal mortality.
**Correct Answer:** C. Women who have undergone a previous uterine surgery (such as a cesarean section or a hysterectomy).