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Placenta accreta...risk factors multiplication


Prior cesarean delivery and the presence of placenta previa in a current pregnancy are particularly important risk factors for placenta accreta. 
In a multicenter study of more than 30,000 patients who had cesarean delivery without labor, the risk of placenta accreta was approximately 0.2%, 0.3%, 0.6%, 2.1%, 2.3%, and 7.7% for women experienc- ing their first through sixth cesarean deliveries, respectively. 
In patients with placenta previa in the current pregnancy, the risk of accreta was 3%, 11%, 40%, 61%, and 67% for those undergoing their first through their fifth or greater cesarean deliveries, respectively 

1-Silver RM, Landon MB, Rouse DT, Leveno KJ, Song CY, Thom EA, et al. Maternal morbidity associated with mul- tiple repeat cesarean delivery. Obstet Gynecol 2006;107: 1226–32. (Level II-2) 


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