Yale Bulletin and Calendar

February 18, 2005|Volume 33, Number 19

Study finds no risk of stillbirth
following caesarean deliveries

Women with a history of caesarean section deliveries do not have a higher risk of a subsequent stillbirth, according to researchers at the School of Medicine and Columbia University.

Yale obstetrics and gynecology scientist Dr. Mert Ozan Bahtiyar presented the findings at the annual meeting of the Society for Maternal Fetal Medicine held Feb. 7-12 in Reno, Nevada.

"Caesarean sections have been associated with some pregnancy complications, but when a physician consults a woman with prior caesarean sections about her next pregnancy, stillbirth should not be one of the concerns," says Bahtiyar.

Fetal death or stillbirth is an underappreciated problem, according to Bahtiyar, who says that stillbirths account for more perinatal deaths than do complications of prematurity or sudden infant death syndrome. Some risk factors for stillbirth include history of a prior stillbirth, a mother over the age of 35, smoking, substance abuse and underlying medical conditions such as diabetes, hypertension or preeclampsia. A previous study by researchers in England found that prior caesarean delivery was also a factor in increased risk of stillbirth.

Bahtiyar and his team decided to confirm the previous study using U.S. data from the Centers for Disease Control and Prevention's combined birth and death certificates from 1995 to 1997. They used a statistical analysis method called Cochran-Mantel-Haenszel to determine the odds of fetal death after prior caesarean section.

"We used a much larger data set of 250,000 patients than the British study, which used 16,000 patients," says Bahtiyar. "We were not expecting different results, but we found that prior caesarean section did not increase the risk of future stillbirth."

Co-authors included Dr. Joshua Copel, Dr. Charles J. Lockwood and Dr. Errol R. Norwitz of Yale; and Dr. Julian Robinson, Dr. Lambert Lumey and Dr. Patricia Zybert of Columbia.

-- By Karen Peart

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