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Am J Obstet Gynecol. 2005 May;192(5):1458-61.

Abnormal placentation: twenty-year analysis.

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  • 1Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Chicago, Ill, USA.

Abstract

OBJECTIVE:

This study was undertaken to determine whether the rate of abnormal placentation is increasing in conjunction with the cesarean rate and to evaluate incidence, risk factors, and outcomes.

STUDY DESIGN:

Cases from 1982-2002 were identified by histopathologic or strong clinical criteria. Risk factors were assessed in a matched case-control study, and analyzed using conditional logistic regression models.

RESULTS:

There were 64,359 deliveries, with cesarean rates increasing from 12.5% (1982) to 23.5% (2002). The overall incidence of placenta accreta was 1 in 533. Significant risk factors for placenta accreta in our final analysis included advancing maternal age (odds ratio [OR] 1.13, 95% CI 1.089-1.194, P < .0001), 2 or more cesarean deliveries (OR 8.6, 95% CI 3.536-21.078, P < .0001), and previa (OR 51.4, 95% CI: 10.646-248.390, P < .0001).

CONCLUSION:

The rate of placenta accreta increased in conjunction with cesarean deliveries; the most important risk factors were previous cesarean delivery, previa, and advanced maternal age.

PMID:
15902137
[PubMed - indexed for MEDLINE]
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