| Objective:1.To determine the value of Doppler ultrasonography(US)and magnetic resonance imaging(MRI)in the third trimester of pregnancy for diagnosing placenta accreta.2.To explore the related factors for different types of placenta accreta.3.To improve the ability to prenatal diagnosis of placeta accreta,thereby to decrease the incidence of maternal complications.Methods:1.A retrospective analysis was performed on 66 cases with diagnostic records of placenta accreta from June 2013 to January 2014 at xxx.Color Doppler US was conducted for all cases while 22 cases underwent MRI.A comparison was made between the two method.2.The clinical data of 86 patients with placenta increta,and 50 patients with placenta accreta admitted in this hospital during Junuary 2015 to December 2015 were retrospectively compared to 114 patients without abnormal placenta attachment for maternal age,the gravidity,the partity,the history of dilation and curettage,previous cesarean section.Results:The sensitivity(Se)(95% confidence intervals)and specificity(Sp)of US with all cases were 77.8 %(67.8,87.8)and 76.7%(66.5,86.9),respectively.For cases with ananterior placenta,the Se and Sp for US were 83.3%(70.1,96.5)and 84.6%(71.9,97.3),respectively.For cases with posterior placenta,the Se and Sp for US were 72.2 %(57.4,87.0)and 70.6%(55.5,85.7).For MRI were 81.0%(64.6,97.4)and 100.0%(100,100)respectively.The occurrence of placenta accreta was related to high maternal age,dilation and curettage(D&C),multigravidity,previous cesarean section.Conclusion:1.The diagnostic value of MRI for placenta accrete was superior to that of Doppler US,especially for posterior placentas.2.Placenta increta was correlated with high maternal age,dilation and curettage(D&C),multigravidity,previous cesarean section,and significant higher than placenta accreta. |
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