The association of placenta previa with history of cesarean delivery and abortion: A metaanalysis☆,☆☆,★,★★
Section snippets
Literature review
We reviewed all studies published between 1950 and 1996 on placenta previa. Studies chosen for the review were selected on the basis of a comprehensive literature search with use of MEDLINE and by identifying studies cited in the bibliography of published reports. Key words that were used in the MEDLINE search included “placenta pr(a)evia,” “placental disorders,” “antepartum h(a)emorrhage,” and “antepartum bleeding.” In addition, the key words “c(a)esarean delivery,” “c(a)esarean section,”
Incidence of placenta previa
Data abstracted from 36 studies2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 resulted in a total of 3.7 million pregnant women, of whom 13,992 were identified with placenta previa. The reported incidence of placenta previa ranged between 0.28% to 1.96%, or approximately 1 in 200 pregnancies. The incidence of placenta previa was the same for both cohort and case-control studies. An examination for trends
Comment
Placenta previa has been reported to occur in approximately 0.3% to 0.8% of pregnancies.1 A variation in this incidence has been attributed to methods of diagnosis, definitions used, and diverse nature of patient populations being studied. Although the overall incidence of placenta previa has been remarkably stable for almost three decades, the incidence of this disorder was almost similar until the mid-1980s (1966 to 1974: incidence was 0.36%; 1975 to 1984, 0.37%), but the incidence was 0.48%
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From the Center for Perinatal Health Initiativesa and the Division of Maternal-Fetal Medicine,b Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School.
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The Center for Perinatal Health Initiatives is supported in part by grant No. 029553 from the Robert Wood Johnson Foundation, New Jersey.
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Reprints not available from the authors.
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