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Abstract Summary Postpartum hemorrhage (PPH) is a serious and life-threatening obstetric complication. The most common cause is uterine atony (1). Known risk factors for the occurrence of atonic PPH include a history of PPH, history of retained placenta, placental abruption, placenta previa, uterine fibroid, hydramnios, multiple pregnancies, augmentation of labor, prolonged labor and instrumental delivery. The conventional treatment for uterine atony is to initiate medical treatment containing uterotonic agents. Additional surgical interventions are used if medical treatment is not adequate. Uterine artery ligation is one of the most common surgical procedure for PPH as it is easy and quick. It can be used alone or with other methods in PPH with a high success rate. The study aims to evaluate the subendometrial blood flow & uterine artery Doppler after its ligation for postpartum hemorrhage. The study carried out at department of Obstetrics & Gynecology of Tanta University Hospital, the study included two groups; the study group included 30 patients who underwent successful Bilateral Uterine Artery Ligation for control of Post-Partum hemorrhage (PPH), the control group included 30 patients selected from those who have given birth without complication during the same period and met the study criteria. Mid luteal Ultrasonographic evaluation for uterine artery and subendometrial blood flow done 3 &6 months post-operative. Uterine |