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  • Vaginal Birth After...

Vaginal Birth After Caesarean Raises Risk of Perineal Tear

Written By : MD Bureau |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2022-02-04T09:15:39+05:30  |  Updated On 4 Feb 2022 10:49 AM IST
Vaginal Birth After Caesarean Raises Risk of Perineal Tear
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Obstetric anal sphincter injury (OASI), the major cause of fecal incontinence in women, occurs at a rate of 0.6%-11% of vaginal deliveries and substantially affects women's quality of life. In a recent study, researchers have reported that women having their first vaginal birth after caesarean (VBAC) have a significantly increased risk of sustaining a third- or fourth-degree tear, compared with primiparous women having a vaginal birth. The study findings were published in the British Journal of Obstetrics and Gynaecology on December 16, 2021.

Vaginal birth after caesarean (VBAC) has been suggested to be associated with an increased risk of obstetric anal sphincter injury (compared with primiparous women who birth vaginally). However, prior studies have been small or have used outdated methodology. Therefore, Dr Anthea Lindquist and his team conducted a study to validate whether the risk of obstetric anal sphincter injury among women having their first VBAC is greater than that among primiparous women having a vaginal birth.

In a state-wide retrospective cohort study, the researchers included 130,000 births and compared the risk of a third-degree perinatal tear among first-time mums with those who birth vaginally after a prior cesarean. They examined covariates using logistic regression for categorical data and the Wilcoxon rank-sum test for continuous data. They used multiple imputations to handle missing data and performed stat analysis using regression adjustment and stata 16 multiple imputation and suite of effects commands.

Key findings of the study:

  • Upon analysis, the researchers found that women having a VBAC (n = 5429) were significantly more likely than primiparous women (n = 123 353) to sustain a third- or fourth-degree tear during vaginal birth (7.1 versus 5.7%).
  • After adjustment for a mode of birth, body mass index, maternal age, infant birth weight, episiotomy and epidural, they observed a 21% increased risk of severe perineal injury (RR 1.21).

The authors concluded, "Women having their first VBAC have a significantly increased risk of sustaining a third- or fourth-degree tear, compared with primiparous women having a vaginal birth. Patient counselling and professional guidelines should reflect this increased risk."

For further information:

DOI: https://doi.org/10.1111/1471-0528.17063


anal sphincter injurycaesarean sectioninstrumental birthrelative riskthird- and fourth-degree tearsvaginal birthBritish Journal of Obstetrics and Gynaecology
Article Source :  British Journal of Obstetrics and Gynaecology
MD Bureau
MD Bureau

    Medical Dialogues Bureau consists of a team of passionate medical/scientific writers, led by doctors and healthcare researchers.  Our team efforts to bring you updated and timely news about the important happenings of the medical and healthcare sector. Our editorial team can be reached at editorial@medicaldialogues.in.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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