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To assess the efficacy and safety of bilateral-contralateral cervix clamp firstly applied in postpartum hemorrhage caused by uterine tony of lower segment. Totally 47 pregnant women with postpartum hemorrhage secondary to lower uterine segment atony in vaginal delivery or after caesarean delivery were included from March 1, 2020 to May 31, 2020. According to patient's informed consent, 22 women accepted cervical clamp to treat and 25 only used uterotonics in control group. Then hemostatic efficacy and safety of bilateral-contralateral c