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Background  To evaluate the effects of systemic methotrexate in cesarean scar pregnancy (CSP) patients treated with ultrasound-guided suction curettage.    Methods  A retrospective review of all women presenting with CSP treated with ultrasound-guided suction curettage at Tongji Hospital, Wuhan, China, between January 1, 2013 and December 31, 2015, was conducted. Patients were grouped into those not treated with methotrexate before curettage (group 1), treated with methotrexate by intramuscular injection (group 2) and treated with methotrexate by intravenous injection (group 3). The clinical characteristics and outcomes were analyzed.    Results  Among 107 patients, 47 patients were not treated with methotrexate before curettage, 46 patients had methotrexate administered by intramuscular injection and 14 patients had methotrexate injected intravenously. There were no significant differences among the groups in basic and clinical characteristics, such as age, gravity, parity, positive fetal heart beat and gestational age at diagnosis. Patients presented similar initial human chorionic gonadotropin (hCG) levels in all groups. After treatment with methotrexate or curettage, the percentage changes and varied ranges of the hCG levels were also similar in all groups. There were no significant differences in intraoperative blood loss and retained products of conception among the three groups. However group 1 had significantly shorter hospital stays than the two groups that were treated with methotrexate ( p <0.001).    Conclusion  By grouping CSP patients who shared similar age, gravity, parity, fetal heart beat positive and gestational age at diagnosis, we found that the presence or absence of methotrexate treatment before curettage resulted in comparable outcomes and hCG levels, although patients who were not treated with methotrexate had significantly shorter stays in the hospital.

Management of Caesarean scar pregnancy with or without methotrexate before curettage: human chorionic gonadotropin trends and patient outcomes