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J Reprod Med. 1997 Jul;42(7):409-12.

Previous cesarean birth. A risk factor for placenta previa?

Author information

1
Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill 27599-7570, USA.

Abstract

OBJECTIVE:

To study the risk of placenta previa following a previous cesarean birth.

STUDY DESIGN:

We conducted a population-based, case-control study using 1990 North Carolina state birth certificate data. The study population included 342 women with a pregnancy complicated by placenta previa and 1,082 randomly selected controls. Analysis was restricted to women who reported one or more previous live births and delivered a singleton, live neonate. Adjusted odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated using logistic regression, controlling for maternal age, race, prior spontaneous or induced abortions and cigarette use.

RESULTS:

When the data were adjusted for maternal age, race, prior spontaneous or induced abortions, and cigarette use, women who had a previous cesarean birth and had a parity of 3 were 1.7 times more likely (OR 1.7, 95% CI 0.7, 4.2) and women of parity > or = 4 were 5.5 times more likely (OR 5.5, 95% CI 1.0, 30.1) to have placenta previa than women of parity 1 who had a previous cesarean birth.

CONCLUSION:

Women with a history of a previous cesarean birth and parity > or = 3 were at increased risk of having a pregnancy complicated by placenta previa.

PMID:
9252931
[Indexed for MEDLINE]
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