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14 March 2012

Reduced baby risk from another caesarean

A major study has found that women who have had one prior caesarean can lower the risk of death and serious complications for their next baby - and themselves.

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A major study led by the University of Adelaide has found that women who have had one prior caesarean can lower the risk of death and serious complications for their next baby - and themselves - by electing to have another caesarean.

The study, known as the Birth After Caesarean (BAC) study, is the first of its kind in the world. It involves more than 2300 women and their babies and 14 Australian maternity hospitals. The results are published this week in the international journal, PLoS Medicine.

The study shows that infants born to women who had a planned elective repeat caesarean had a significantly lower risk of serious complications compared with infants born to mothers who had a vaginal birth following a prior caesarean - the risk of death or serious complication for the baby is 2.4% for a planned vaginal birth, compared with 0.9% for a planned elective repeat caesarean.

The mothers of these babies were also themselves less likely to experience serious complications related to birth. For example, the risk of a major hemorrhage in the mother is 2.3% for a planned vaginal birth, compared with 0.8% for a planned elective repeat caesarean.

"Until now there has been a lack of high-quality evidence comparing the benefits and harms of the two planned modes of birth after previous caesarean," says the study's leader, Professor Caroline Crowther from the Australian Research Centre for the Health of Women and Babies (ARCH), part of the University of Adelaide's Robinson Institute.

Caring for women after C-section

"The information from this study will help women, clinicians and policy makers to develop health advice and make decisions about care for women who have had a previous caesarean.

"Both modes of birth have benefits and harms. However, it must be remembered that in Australia the risks for both mother and infant are very small for either mode of birth," Professor Crowther says.

Caesarean section is one of the most common operations performed on childbearing women, with rates continuing to rise worldwide. Repeat caesarean births are now common in many developed nations.

In Australia in 2008, more than 90 700 women gave birth by caesarean, accounting for more than 31% of all births. Of Australian women who had a previous caesarean section, 83.2% had a further caesarean for the birth of their next child. In South Australia alone, repeat caesarean births amount to 28% of the overall caesarean section rate.

"We hope that future research will follow up mothers and children involved in this study, so that we can assess any longer term effects of planned mode of birth after caesarean on later maternal health, and the children's growth and development," Professor Crowther says.

(EurekAlert, March 2012)

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Planning for birth

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