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Created on : 02 Aug 2014
Modified on : 02 Aug 2014

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Bibliographical entry (without author) :

Third- and fourth-degree perineal tears among primiparous women in England between 2000 and 2012: time trends and risk factors - BJOG: An International Journal of Obstetrics & Gynaecology - Vol. 120, 12 - ISBN: 1471-0528 - p.1516-1525

Author(s) :

Gurol-Urganci, I; Cromwell, Da; Edozien, Lc; Mahmood, Ta; Adams, Ej; Richmond, Dh; Templeton, A; van der Meulen, Jh

Year of publication :

2013

URL(s) :

http://onlinelibrary.wiley.com/doi/10.1111/1471-05…
https://doi.org/10.1111/1471-0528.12363

Résumé (français)  :

Abstract (English)  :

Objective

To describe the trends of severe perineal tears in England and to investigate to what extent the changes in related risk factors could explain the observed trends.


Design

A retrospective cohort study of singleton deliveries from a national administrative database.


Setting

The English National Health Service between 1 April 2000 and 31 March 2012.


Population

A cohort of 1 035 253 primiparous women who had a singleton, term, cephalic, vaginal birth.


Methods

Multivariable logistic regression was used to estimate the impact of financial year of birth (labelled by starting year), adjusting for major risk factors.


Main outcome measure

The rate of third-degree (anal sphincter is torn) or fourth-degree (anal sphincter as well as rectal mucosa are torn) perineal tears.


Results

The rate of reported third- or fourth-degree perineal tears tripled from 1.8 to 5.9% during the study period. The rate of episiotomy varied between 30 and 36%. An increasing proportion of ventouse deliveries (from 67.8 to 78.6%) and non-instrumental deliveries (from 15.1 to 19.1%) were assisted by an episiotomy. A higher risk of third- or fourth-degree perineal tears was associated with a maternal age above 25 years, instrumental delivery (forceps and ventouse), especially without episiotomy, Asian ethnicity, a more affluent socio-economic status, higher birthweight, and shoulder dystocia.


Conclusions

Changes in major risk factors are unlikely explanations for the observed increase in the rate of third- or fourth-degree tears. The improved recognition of tears following the implementation of a standardised classification of perineal tears is the most likely explanation.

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Keywords :

➡ episiotomy

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Import 02/08/2014 — 02 Aug 2014