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  • Lateral episiotomy may...

Lateral episiotomy may reduce risk of obstetric anal sphincter injury in first time mothers: BMJ

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2024-06-21T05:45:45+05:30  |  Updated On 21 Jun 2024 5:46 AM IST
Lateral episiotomy may reduce risk of obstetric anal sphincter injury in first time mothers: BMJ
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In first-time mothers requiring vacuum-assisted delivery, a lateral episiotomy in the tissue between the vaginal and anal opening more than halves the risk of obstetric anal sphincter injury, a severe form of perineal trauma between the vulva and anus. This according to a randomised clinical study led by researchers at Karolinska Institutet and Stockholm’s Danderyd Hospital, the results of which are published in The BMJ.

Obstetric Anal Sphincter Injury (OASI), which involves the anal sphincter muscles, can lead to anal incontinence with difficulties retaining gas and faeces. It can also cause sexual problems and impair quality of life. This serious form of perineal injury affects around five per cent of all first-time mothers in Sweden who have a vaginal birth.

“Women giving birth for the first time and requiring instrumental birth are at the highest risk of sustaining OASI,” says Sophia Brismar Wendel, associate professor in obstetrics and gynaecology at the Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet and senior consultant at the Department of Women’s Health, Danderyd Hospital. “Therefore, we wanted to assess if such injury could be prevented in this group with a lateral episiotomy (angled cut in the perineum) when the baby’s head is crowning.”

Participants were recruited to the EVA (Episiotomy in Vacuum Assisted delivery) trial at eight Swedish hospitals between 2017 and 2023. Over 6 100 pregnant women expecting their first child agreed to take part if the delivery required vacuum assistance. A total of 702 women with a vacuum assisted delivery were randomly assigned to receive a lateral episiotomy or no episiotomy.

The lateral episiotomy reduced the risk of OASI by an average of 53 per cent. Among the women assigned to the procedure, 6.1 per cent sustained an OASI, compared to 13.1 per cent in the comparison group. Moreover, the procedure did not increase the risk of severe blood loss, negative birth experience, prolonged hospitalisation or additional complications. However, the risk of wound complications such as wound infection and wound dehiscence was increased in the episiotomy group.

“Episiotomy as a medical intervention is controversial as it has historically also been used for normal births, sometimes without the woman’s consent,” says Sophia Brismar Wendel. “The use of episiotomy is highly variable in different countries, and in Sweden we’ve practised restrictive use given the lack of evidence. However, these results may impact obstetric care both in Sweden and elsewhere.”

The trial is also gathering data on the women’s self-reported symptoms at one and five years after childbirth. The results from the one-year follow-up will soon be analysed, which might give some answers about any differences in symptoms, such as anal incontinence and sexual function.

“This may help doctors and pregnant women in shared informed decision-making regarding the use of a prophylactic lateral episiotomy,” says Sophia Brismar Wendel.

Reference:

Bergendahl S, Jonsson M, Hesselman S, Ankarcrona V, Leijonhufvud /span>, Wihlbäck A et al. Lateral episiotomy or no episiotomy in vacuum assisted delivery in nulliparous women (EVA): multicentre, open label, randomised controlled trial BMJ 2024; 385 :e079014 doi:10.1136/bmj-2023-079014.

The BMJvacuum assisted deliveryObstetric Anal Sphincter InjuryEpisiotomy
Source : The BMJ
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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