Objective: To explore the MRI findings of placental protusion sign in predicting postpartum hemorrhage in pa—tients with placenta previa．
Methods: Totally 35 4 placenta previa patients with whole clinical data underwent MR scaning 2weeks before operation．Association of postpartum hemorrhage and placental protusion sign was analyzed．
Results: Among354 patients with placental previa，the age of the pregnant women(#一4．34，P一0．04)，gestational age at delivery(z2—5．19，P一0．02)and the number of cesarean sections(Z2=44．85，P<O．01)had associated with postpartum hemorrhage．Eight cases had placental protusion sign in MRI，while 6 cases occurred postpartum hemorrhage．The incidence of postpar—tum hemorrhage was 75．00％(6／8)and 12．72％(44／346)in patients with placenta accreta and with placental abruption。respectively(3[2—20．14，P<O．01)．The sensitivity，specificity，odds ratio(95％confidence interval)and positive likeli—hood ratio of predicting postpartum hemorrhage was 12．00％(6／50)，99．34％(302／304)，20．59(4．03，105．23)and15．68，respectively.
Conclusion MRI placental protrusion sign has important clinical reference value in predicting postpar—tum hemorrhage．
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