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  • Title: Patient selection for later delivery timing with suspected previa-accreta.
    Author: Perlman NC, Little SE, Thomas A, Cantonwine DE, Carusi DA.
    Journal: Acta Obstet Gynecol Scand; 2017 Aug; 96(8):1021-1028. PubMed ID: 28374887.
    Abstract:
    INTRODUCTION: We identified patients with previa and suspected accreta who are at lowest risk of unscheduled delivery or major morbidity with planned delivery beyond 34 weeks' gestation. MATERIAL AND METHODS: This was a retrospective cohort study of patients who had reached 34.0 weeks' gestational age with a suspected previa-accreta. We evaluated rates of unscheduled and emergent delivery based on known risk factors for premature birth. In a second analysis, we stratified patients based on level of preoperative morbidity concern and evaluated rates of major transfusion and Intensive Care Unit admission by delivery week (34 weeks, 35 weeks or 36 weeks and beyond). RESULTS: Of 84 available patients, we classified 31 patients as low risk for unscheduled delivery and 52 as high risk. The low risk group was scheduled later (36.6 vs. 36.0 weeks; p < 0.01), but demonstrated lower rates of unscheduled delivery prior to 36 weeks (3% vs. 19%, p = 0.05). Of the patients with no prior cesarean section, only one (7%) experienced massive blood loss even though 36% had unscheduled deliveries. We observed no significant increase in major transfusion or massive blood loss with advancing gestational age, likely due to selection of the most concerning patients for early, scheduled delivery. CONCLUSION: Patients with suspected previa-accreta and no risk factors for preterm birth are at low risk for an unscheduled delivery prior to 36 weeks. Those with no concern for percreta or increta or no prior cesarean section may also be candidates for later delivery.
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