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Answer 3
- Prior cesarean section.
Prior cesarean section is a significant risk factor for placenta previa.1 The incidence of placenta previa increases in a linear fashion after each cesarean section, increasing from 1% to 5% after 1 cesarean section to 10% after 4 cesarean sections.3 Other risk factors include cocaine use, age older than 35 years, multiparity, cigarette smoking, multiple pregnancy, intrauterine surgery, and abortion.4
REFERENCES
1. Oyelese Y, Smulian JC. Placenta previa, placenta accreta, and vasa previa. Obstet Gynecol 2006;107:927–41.
3. Baron F, Hill WC. Placenta previa, placenta abruptio. Clin Obstet Gynecol 1998;41:527–32.
4. Faiz AS, Ananth CV. Etiology and risk factors for placenta previa: an overview and meta-analysis of observational studies. J Matern Fetal Neonatal Med 2003;
13:175–90.
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