Risk factors for recurrent obstetric anal sphincter injury (rOASI): a systematic review and meta-analysis

[Anal incontinence and obstetrical anal sphincter injuries, epidemiology and prevention]

Our main objectives were to identify risk factors, methods for early diagnosis, and prevention of obstetric anal sphincter injuries (OASIs), using a literature review. The main risk factors for OASIs are nulliparity, instrumental delivery, posterior presentation, median episiotomy, prolonged second phase of labor and fetal macrosomia. Asian origin, short ano-vulvar distance, ligamentous hyperlaxity, lack of expulsion control, non-visualization of the perineum or maneuvers for shoulder dystocia also appear to be risk factors. There is a risk of under-diagnosis of OASIs in the labor ward. Experience of the accoucheur is a protective factor. Secondary prevention is based on the training of birth professionals in recognition and repair of OASIs. Primary prevention of OASIs is based on training in the maneuvers of the second phase of labor; if possible, instrumental extractions should be avoided. Mediolateral episiotomy may have a preventive role in high-risk OASIs deliveries. A robust predictive model is still lacking to allow a selective use of episiotomy.

Factors that influence patient preference for mode of delivery following an obstetric anal sphincter injury

PURPOSE

A common indication for elective caesarean is previous obstetric anal sphincter injury (OASI). This study aims to identify factors that influence womens' preferences regarding mode of delivery (MoD) in a subsequent pregnancy following an OASI.

METHODS

100 consecutive women who sustained an OASI completed a questionnaire when attending postnatal follow up at a perineal trauma clinic. They also completed ePAQ-PF to assess pelvic floor symptoms. Data was collated and percentages generated for each response. A chi-squared calculation was used for preferred MoD.

RESULTS

In total, 75 women were Primiparous and 25 Multiparous. 20% of women were advised to have a caesarean, with the remainder advised either a vaginal delivery or further investigations. 79% of women had a 3a/3b tear and 21% of women had a 3c/4th degree OASI. Based on women's preferences, those who sustained a 3c/4th degree tear were more likely to opt for CS than a 3a/b degree tear (p<0.001). Bowel symptoms per se did not correlate with choice of MoD in either group. In women with 3c/4th OASI vaginal or sexual symptoms did not impact on the decision regarding choice of delivery but in women who sustained a 3a/b tear the impact on sexual function appears to be the commonest symptom in those who wished a caesarean section.

CONCLUSION

Women with 3c/4th OASI are more likely to accept a planned CS. Bowel symptoms appear to have little impact on this but in women with lower grade tears sexual symptoms have the greatest impact on preferred MoD.

Recurrent obstetric anal sphincter injury and the risk of long-term anal incontinence

BACKGROUND

Women with an obstetric anal sphincter injury are concerned about the risk of recurrent obstetric anal sphincter injury in their second pregnancy. Existing studies have failed to clarify whether the recurrence of obstetric anal sphincter injury affects the risk of anal and fecal incontinence at long-term follow-up.

OBJECTIVE

The objective of the study was to evaluate whether recurrent obstetric anal sphincter injury influenced the risk of anal and fecal incontinence more than 5 years after the second vaginal delivery.

STUDY DESIGN

We performed a secondary analysis of data from a postal questionnaire study in women with obstetric anal sphincter injury in the first delivery and 1 subsequent vaginal delivery. The questionnaire was sent to all Danish women who fulfilled inclusion criteria and had 2 vaginal deliveries 1997-2005. We performed uni- and multivariable analyses to assess how recurrent obstetric anal sphincter injury affects the risk of anal incontinence.

RESULTS

In 1490 women with a second vaginal delivery after a first delivery with obstetric anal sphincter injury, 106 had a recurrent obstetric anal sphincter injury. Of these, 50.0% (n = 53) reported anal incontinence compared with 37.9% (n = 525) of women without recurrent obstetric anal sphincter injury. Fecal incontinence was present in 23.6% (n = 25) of women with recurrent obstetric anal sphincter injury and in 13.2% (n = 182) of women without recurrent obstetric anal sphincter injury. After adjustment for third- or fourth-degree obstetric anal sphincter injury in the first delivery, maternal age at answering the questionnaire, birthweight of the first and second child, years since first and second delivery, and whether anal incontinence was present before the second pregnancy, the risk of flatal and fecal incontinence was still increased in patients with recurrent obstetric anal sphincter injury (adjusted odds ratio, 1.68 [95% confidence interval, 1.05-2.70), P = .03, and adjusted odds ratio, 1.98 [95% confidence interval, 1.13-3.47], P = .02, respectively). More women with recurrent obstetric anal sphincter injury reported affected the quality of life because of anal incontinence (34.9%, n = 37) compared with women without recurrent obstetric anal sphincter injury (24.2%, n = 335), although this difference did not reach statistical significance after adjustment (adjusted odds ratio, 1.53 [95% confidence interval, 0.92-2.56] P = .10).

CONCLUSION

Women opting for vaginal delivery after obstetric anal sphincter injury should be informed about the risk of recurrence, which is associated with an increased risk of long-term flatal and fecal incontinence.

How Are Obesity and Body Composition Related to Patellar Cartilage? A Systematic Review

Objective.

The aim of this review was to systematically examine the evidence for an association between measures of obesity [weight and body mass index (BMI)] and body composition (fat mass and fat-free mass) and patellar cartilage, assessed using magnetic resonance imaging.

Methods.

Three electronic databases (MEDLINE, EMBASE, and CINAHL) were searched up to April 2016 using full text and MeSH terms to identify studies examining the associations between obesity and body composition, and patellar cartilage. Two independent reviewers extracted the data and assessed the methodological quality of included studies.

Results.

Seventeen studies were included: 5 cross-sectional, 10 cohort studies measuring outcomes at 2 timepoints, and 2 longitudinal studies assessing outcome only at the timepoint. Eleven studies were of high or moderate quality. In asymptomatic middle-aged adults, elevated body weight and BMI were systematically associated with worse patellofemoral cartilage scores. There was more consistent evidence for patellar cartilage defects than patellar cartilage volume, particularly in women. Increased BMI was also consistently associated with increased cartilage loss in longitudinal studies, although not all attained statistical significance.

Conclusion.

There is a need for more high-quality research to confirm these findings and to better explain the relative contributions of metabolic and biomechanical factors to the initiation of patellofemoral osteoarthritis, to devise effective strategies to manage this common and disabling condition.

Does pelvic floor muscle contraction early after delivery cause perineal pain in postpartum women?

OBJECTIVE

Pelvic floor muscle training is effective and necessary in the prevention and treatment of pelvic floor dysfunction during pregnancy and after childbirth. But because of the high prevalence of perineal pain observed in women after childbirth, many women and caregivers fear to start pelvic floor muscle training immediately after childbirth. However, it is unknown whether pelvic floor muscle contractions (PFMC) provoke perineal pain in women shortly after childbirth. Therefore, the main objective is to study whether PFMC performed immediately after childbirth is painful or not.

STUDY DESIGN

Observational longitudinal study. Perineal pain was assessed (1-6 days and 9 weeks postpartum) using a visual analogue scale (VAS 0-10) during PFMC and during several activities of daily living (ADL), during micturition and defecation. Descriptive statistics, Wilcoxon and McNemar tests were used.

RESULTS

A total of 233 women participated (148 primiparous and 85 multiparous). Immediately postpartum the prevalence and intensity of pain during ADL (73%; VAS 4.9 (±2.3)), micturition (47%; VAS 3.4 (±1.7)) and defecation (19%; VAS 3.6 (±2.2)) were significantly higher (all p<0.000) than during PFMC (8%; VAS 2.2 (±0.9)). At 9 weeks postpartum, 30% experienced perineal pain during sexual intercourse (VAS 4.6 +/- 2.3) and 18% during defecation (VAS 4.7 +/- 2.3), but none during PFMC.

CONCLUSION

Perineal pain is highly prevalent immediately after childbirth during ADL, micturition and defecation, but not during PFMC (only 8%). In case perineal pain occurs during PFMC, the intensity of pain is low (VAS 2). These results show that fear of perineal pain should not discourage women to start pelvic floor muscle training shortly after childbirth.