OASI: a preventable injury?

Kapaya, Habiba; Hashim, Sharifah

doi:10.1016/j.ejogrb.2014.11.023

Cited by 12 publications

(12 citation statements)

References 25 publications

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“…The influence of maternal BMI on OASIS remains controversial. 3,4,[8][9][10] Most studies have concluded that a higher maternal BMI is a protective factor for OASIS 4,8,10 or is not associated with OASIS. 3,9 In the present study, a higher maternal BMI was a protective factor for OASIS during vacuum delivery for the whole study population but not for the primiparous subgroup.…”

Section: Discussionmentioning

confidence: 99%

“…3,4 In addition to operative vaginal delivery, recognized risk factors for OASIS include Asian ethnicity, primiparity, midline episiotomy, occiput posterior position at delivery, and fetal macrosomia. Logistic regression analysis was used to compare various factors (maternal, delivery, and neonatal factors) between women with and those without OASIS.…”

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confidence: 99%

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Objective: To investigate factors associated with obstetric anal sphincter injuries (OASIS) during vacuum delivery among Chinese women.

Methods:

A retrospective cohort study of Chinese women who underwent vacuumassisted vaginal delivery at a tertiary referral hospital in Taiwan between January 2010 and December 2016. [3][4][5][8][9][10][11][12][13][14][15][16] Many studies have reported that women of Asian ethnicity are at a higher risk of OASIS during vaginal delivery. Of the women who had a vacuum delivery, 1073 (34.16%) sustained OASIS, of whom 967 (90.12%) were primiparous.

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confidence: 99%

“…K E Y W O R D S Chinese women; Epidural analgesia; Episiotomy; OASIS; Obstetric anal sphincter injuries; Primiparous; Vacuum delivery | 355 Chen eT AL.maternal morbidity including perineal pain, blood loss, and urinary retention; it also increases the risk of OASIS. 3,4 In addition to operative vaginal delivery, recognized risk factors for OASIS include Asian ethnicity, primiparity, midline episiotomy, occiput posterior position at delivery, and fetal macrosomia. 4-7 However, other factors, including maternal age, maternal body mass index (BMI), induction of labor, mediolateral episiotomy, and use of epidural analgesia, show discrepancies between studies and populations.…”

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confidence: 99%

“…4-7 However, other factors, including maternal age, maternal body mass index (BMI), induction of labor, mediolateral episiotomy, and use of epidural analgesia, show discrepancies between studies and populations. [3][4][5][8][9][10][11][12][13][14][15][16] Many studies have reported that women of Asian ethnicity are at a higher risk of OASIS during vaginal delivery. For example, two studies reported a 2-3-fold higher rate of OASIS among Asian women compared with white women 4,6 ; however, such studies have mainly been conducted in countries outside Asia and include a relatively small number of Chinese women.…”

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confidence: 99%

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Factors associated with obstetric anal sphincter injuries during vacuum delivery among Chinese women

Chen

Sun

et al. 2019

Intl J Gynecology & Obste

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Objective To investigate factors associated with obstetric anal sphincter injuries (OASIS) during vacuum delivery among Chinese women. Methods A retrospective cohort study of Chinese women who underwent vacuum‐assisted vaginal delivery at a tertiary referral hospital in Taiwan between January 2010 and December 2016. Logistic regression analysis was used to compare various factors (maternal, delivery, and neonatal factors) between women with and those without OASIS. Results Among 18 744 Chinese women with singleton vaginal delivery, 3141 (16.76%) had vacuum assistance and 2634 (83.86%) were primiparous. Of the women who had a vacuum delivery, 1073 (34.16%) sustained OASIS, of whom 967 (90.12%) were primiparous. The major independent risk factors for OASIS were primiparity (adjusted odds ratio [aOR], 2.93; 95% confidence interval [CI], 2.29–3.76) and use of midline episiotomy (aOR, 3.01; 95% CI, 1.74–5.17). However, epidural analgesia had a protective effect (aOR, 0.64; 95% CI, 0.54–0.75) against OASIS. In multivariate analysis for the primiparous subgroup, the independent significant risk factors for OASIS remained the same. Conclusion A high incidence of OASIS during vacuum delivery was observed among Chinese women. Midline episiotomy was found to be a modifiable risk factor for OASIS, whereas epidural analgesia had a protective effect.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

“…

Objective: To investigate factors associated with obstetric anal sphincter injuries (OASIS) during vacuum delivery among Chinese women.

Methods:

…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Factors associated with obstetric anal sphincter injuries during vacuum delivery among Chinese women

Chen

Sun

et al. 2019

Intl J Gynecology & Obste

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Maternal origin matters: Country of birth as a risk factor for obstetric anal sphincter injuries

André,

Stuart,

Källén

2024

Intl J Gynecology & Obste

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ObjectiveObstetric anal sphincter injuries (OASIS) are severe complications to vaginal births with potential long‐term consequences. Maternal origin has been proposed to affect the overall risk, but the association and underlying explanation are uncertain. The objective was to assess the association between maternal country of birth and OASIS.MethodsA Swedish nationwide cohort study including singleton term vaginal births during 2005–2016. Data were extracted from the Swedish Medical Birth Registry and Statistics Sweden. Modified Poisson regression analyses were performed to obtain crude and adjusted risk ratios (RRs). Adjustments were made in four cumulative steps. Sub‐analyses were performed to investigate the risk of OASIS associated with female genital circumcision (FGC).ResultsIn all, 988 804 births were included. The rate of OASIS in Swedish‐born women was 3.5%. Women from East/Southeast Asia had an increased risk of OASIS (adjusted RR [aRR] 1.71, 95% confidence interval [CI] 1.60–1.83), as did women born in Sub‐Saharan Africa (aRR 1.60, 95% CI 1.49–1.72). The risk remained significantly increased also after adjustment for maternal height. By contrast, women from South/Central America had a decreased risk of OASIS (aRR 0.65, 95% CI 0.56–0.76). FGC was associated with an increased risk of OASIS (aRR 3.05, 95% CI 2.60–3.58). Episiotomy appeared to have an overall protective effect (aRR 0.95, 95% CI 0.92–0.98), but not significantly more protective among women with female genital mutilation.ConclusionsCountry of birth plays an important role in the risk of OASIS. Women from East/Southeast Asia and Sub‐Saharan Africa are at significantly increased risk as compared with Swedish‐born women, whereas women from South/Central America are at lower risk. FGC is also a significant risk factor for OASIS.

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