ABSTRACT
We identify characteristics that predict resolution of placenta previa and develop
a clinical model for likelihood of resolution. 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. Of the 366 cases, 84% of complete placentae previae and 98%
of marginal placentae previae 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. Marginal previae diagnosed in the second trimester do not appear to warrant
repeat ultrasound evaluation for resolution.
KEYWORDS
Placenta previa - marginal previa - bleeding - pregnancy - resolution
REFERENCES
keichelb@med.unc.edu
