Objective To identify characteristics that predict resolution of placenta previa and to develop a clinical model for likelihood of resolution. Methods We conducted a retrospective study of 366 singleton pregnancies complicated by placenta previa diagnosed with resolution of the previa as the primary outcome. Regression analyses were performed to determine variables associated with resolution, and optimal timing for repeat sonographic evaluation. A likelihood of resolution model was created using a parametric survival model with Weibull hazard function. Results Of the 366 cases, 84% of complete placenta previas and 98% of marginal placenta previas resolved at a mean gestational age of 28.6 ±5.3 weeks. Only gestational age and distance from the internal cervical os at the time of diagnosis were significantly associated with resolution (p<0.01). Likelihood of resolution was not significantly associated with any other variables. Conclusion Only gestational age and distance from the internal os at time of diagnosis predict likelihood of resolution of placenta previa. Marginal previas diagnosed in the 2nd trimester do not appear to warrant repeat ultrasound evaluation for resolution.
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