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uterine atony

Productivity includes uterine contractility, abdominal wall muscle and diaphragm muscle contractility and levator anus muscle contractility, among which uterine contractility is the main force. In the process of delivery, the rhythm, symmetry and polarity of uterine contraction are abnormal or the intensity and frequency are changed, which is called abnormal uterine contraction force. Clinically, it is difficult to form obstruction due to abnormal birth canal or fetal factors...

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