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Vaginal Birth After Cesarean can be Risky in Some Cases

by Thilaka Ravi on May 7, 2018 at 6:39 PM
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Vaginal Birth After Cesarean can be Risky in Some Cases

Attempted vaginal birth after cesarean (VBAC) is linked with higher rates of adverse effects or death for mothers and infants finds a new study. However, absolute rates were low in mothers who attempted this type of birth observes research published in CMAJ (Canadian Medical Association Journal) today.

"The absolute rates of adverse maternal and neonatal outcomes are low with both attempted VBAC and elective repeat cesarean delivery," says Dr. Carmen Young, University of Alberta. "Both are reasonable options for women in general; however, attempted VBAC continues to be associated with higher relative rates of severe adverse maternal and neonatal outcomes compared with an elective repeat cesarean delivery."



For women who have had a single previous cesarean section, the best mode of delivery in a later pregnancy is controversial, as there are risks and benefits to attempting a VBAC or having an elective repeat cesarean section. Attempted VBAC is associated with a higher risk of uterine rupture, hemorrhage and other maternal and infant complications. Repeat cesarean sections are associated with an increased risk of surgical complications and placental complications in subsequent pregnancies. It is also difficult to predict which patients will have a successful VBAC.

Planning mode of delivery for women with a previous cesarean delivery is therefore challenging for both the patient and her care provider.

Researchers conducted a study using information on all women in Canada (excluding Quebec) who had a previous cesarean delivery and subsequently delivered between 2003 and 2015. The study found that, although the number of women with a previous cesarean delivery increased from 2003 to 2014, rates of attempted VBAC and success rates after attempting labor were essentially unchanged.

"This topic is an important issue because rates of cesarean section continue to rise and the most common single indication for a cesarean delivery is a prior cesarean delivery," says Dr. Young. "Once a woman has had two cesarean deliveries, she is very unlikely to have a subsequent vaginal delivery due to high maternal and neonatal risks associated with labor."

The authors also found that infant, but not maternal, outcomes, have worsened between 2003 and 2015 after attempted VBAC. Further study is required to determine the cause for this unexpected finding.

The study highlights the importance of appropriate patient selection for attempting VBAC and careful monitoring of labor and delivery to optimize safety for these women and their infants. "For women who may be candidates for an attempted VBAC, the choice between an elective repeat cesarean delivery and an attempted VBAC depends on the woman's desire for a vaginal delivery, her tolerance for risk and whether she is planning a small or large family," says Dr. Young.

The study was conducted by researchers from the University of Alberta, Edmonton, Alberta; Public Health Agency of Canada; University of British Columbia, Vancouver, BC; and King Saud University, Riyadh, Saudi Arabia.

"Mode of delivery after a previous cesarean birth and associated maternal and neonatal morbidity" is published May 7, 2018.

Source: Eurekalert

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