Failure to Void in Labour: Postnatal Urinary and Anal Incontinence by Linda Birch, Patrick M Doyle, Roger Ellis and Elaine Hogard
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TRAUMA IN CHILDBIRTH Failure to void in labour: postnatal urinary and anal incontinence By Linda Birch, Patrick M Doyle, Roger Ellis and Elaine Hogard 2.8% (Arya et al, 2001) to 77% (Sampselle et al, 1996). This Abstract wide variation may be explained by differing research meth- ods. Some studies use urodynamic assessment; others use a The objectives was to identify the impact of intrapartum voiding self-reported questionnaire. Some include multiparous and on postnatal urinary and anal incontinence. A longitudinal, primiparous women while others, such as this one, focus on prospective, repeated measures, cohort study design was used. primiparous women only. The time that the patient is asked The study was set in one of the biggest and busiest acute NHS about their symptoms can vary from a few days postnatally to university teaching hospitals in the North West of England, which several years, so it is difficult to compare studies. provides maternity care to over 4000 women each year. Persistent postnatal urinary incontinence is often attrib- Primiparous women with no pre-existing disease (n=516) uted to pathophysiological changes consequential to labour participated and were recruited after a normal 20-week gestation and delivery. In addition to trauma to the bladder, urethra obstetric ultrasound scan. and supporting structures, denervation of the pelvic floor and Data was collected using validated questionnaires during the perineal muscle injury are thought to directly contribute to last trimester of pregnancy and postnatally at six weeks, six postnatal urinary incontinence. months and finally at one year. Obstetric and demographic data During vaginal delivery, the endopelvic fascia and leva- was extracted from case notes. This included age, body mass tor ani muscles may become traumatised. In addition, the index, gestation, duration of labour, analgesia, birth weight, nerve supply to the levator musculature, i.e. the pudendal mode of delivery and perineal trauma. Statistical analysis was nerve, may suffer stretch injury leading to denervation. The undertaken using Statistics Package for Social Sciences (SPSS result may lead to stress incontinence (Freeman, 2002). version 13.0). MRI scanning (Tunn et al, 1999; Kearney et al, 2006) and The main outcome measures were urinary incontinence electromyography (EMG) studies (Weidner et al, 2006) symptoms and anal incontinence symptoms. Prolonged periods of have both confirmed levator defects in primiparae following time in labour without emptying the bladder was associated with vaginal delivery. increased rates of postnatal urinary incontinence (OR 2.36) and This has led to the assertion that a caesarean section will may also contribute to anal incontinence. have a protective effect. Data identifying obstetric risk fac- Postnatal urinary incontinence may be reduced if intrapartum tors and consequential perineal and nerve damage remain bladder care policies reflect frequent emptying. This preliminary contradictory. The pathophysiology of urinary inconti- data supports large-scale exploration of the association between nence remains unclear but pregnancy itself seems to be a postnatal anal incontinence and bladder emptying in labour. considerable risk factor. The autonomic innervation of the bladder and urethra can degenerate during pregnancy and the regeneration after each delivery appears to be incom- regnancy and childbirth are established risk fac- plete (Owman 1981; Grandadam et al, 1999; Bakircioglu tors for the development of urinary incontinence. et al, 2000). Traumatic stretching and compression of the PIncontinence during the initial few weeks after deliv- peripheral nerve supply to the pelvic floor is associated ery is frequently transient and often destined to subside with pregnancy, labour and delivery and may result in par- as hormonal and pressure effects resolve. Within the first tial denervation of the striated muscle in and around the postnatal year, rates of urinary incontinence range from urethra, leading to urinary dysfunction and incontinence (Handa et al, 1996). Linda Birch is Head of Midwifery and Gynaecology, Women’s and Results of many epidemiologic studies (Jolleys, 1988; Children’s Division; Patrick M Doyle is Consultant Obstetrician Persson et al, 2000; Farrell et al, 2001; Goldberg et al, 2005; & Urogynaecologist, Wirral University Teaching Hospital NHS Van Brummen et al, 2007) and pathophysiological studies Foundation Trust, Wirral; Professor Roger Ellis is Professor of (Snooks et al, 1990; King and Freeman 1998) assessing Social and Health Sciences, Director of Research Policy and risk factors for incontinence have been largely inconclusive, Associate Dean Research and Development, Chester University, often presenting contradictory conclusions. However, from Chester; Professor Elaine Hogard is Reader in Evaluation the evidence available, some risk factors for the develop- Research and Leader of Social and Health Evaluation Unit, Social ment of urinary incontinence in an obstetric population can and Health Evaluation Unit, Chester University, Chester be identified, for example, raised body mass index (BMI), Email: [email protected] vaginal delivery, and instrumental delivery. Other risk fac- tors remain controversial. These include smoking, age, diet, 562 BRITISH JOURNAL OF MIDWIFERY, SEPTEMBER 2009, VOL 17, NO 9 TRAUMA IN CHILDBIRTH increased parity, total labour duration, length of second stage of labour, fetal size, and genital tract trauma. Further respondents who did not potential risk factors, such as voiding in labour, have not been explored. empty their bladder for more Prevalence of anal incontinence among postnatal women than four hours prior to varies between 1% and 21% (Johanson and Lafferty 1996; ‘ Boreham et al, 2005). As with studies looking at urinary beginning the second stage symptoms, there are problems with definition, method, clas- sification and sample selection. Higher rates were recorded by of labour were ... more studies using longer term follow-up; with 22–30.5% report- ing anal incontinence at one-year postnatal (Fynes et al, 1999; likely to report any urinary Van Brummen et al, 2006). incontinence ... Anal sphincter damage is a recognized risk factor for postnatal anal incontinence. Recent studies have found evidence of postnatal occult anal sphincter damage in 7–28% of primiparous women (Abramowitz et al, 2000; regarding the care received and progress of labour. This Faltin et al, 2000; Andrews et al, 2005; Nichols et al, included age, gestation, BMI, onset,’ progress and duration 2006) with one study demonstrating 19% of primiparous of labour, analgesia, birth weight, mode of delivery and women who were classed as having a first- or second- perineal trauma. degree tear having an anal sphincter defect on endo-anal scan (Nichols et al, 2006). Analysis Statistical analysis was undertaken using Statistics Package for Method Social Science (SPSS version 13.0). Variables were analysed as This longitudinal prospective study collected data from continuous scales, incremental scales and percentile groups of primiparous patients during the last trimester of pregnancy, approximately equal size. and also postnatally at six weeks, six months and one year, using the Kings Health Incontinence Questionnaire (Kelleher Ethical approval et al, 1997). The Kings Health Questionnaire is a validated Ethical approval was granted by the Local Research Ethics tool used to assess urinary incontinence and its impact on Committee for Wirral. quality of life. It explores perception of general health and the perceived impact of incontinence on aspects of life. This Results is followed by a symptom index where patients are asked to Following exclusions owing to severe maternal or fetal illness indicate how often they are experiencing urinary symptoms 1023 women offered full participation. A total of 862 women on a three-point scale (a little; moderately; a lot). The remain- (84.1%) agreed to participate in the study. ing items explore the impact of urinary incontinence on Of the 862 women recruited (59.9%) 516 returned at quality of life. Finally, questions are included which explore least 2 of the 3 postnatal questionnaires and are included in behaviour undertaken to address the continence problem, postnatal data analysis. Women only returning 1 postnatal such as wearing pads, alteration to diet and embarrassment. questionnaire (n=237; 27.5%) were excluded from data This section forms a severity score. Given that the same ques- analysis due to incompleteness. Of the 516 postnatal data sets tionnaire was given to the same patients, on three occasions analysed, 404 (78.3%) women completed the questionnaire over the course of the postnatal year, it was also possible to determine if incontinence was progressive—getting worse, or Table 1. Symptoms reported regressive—getting better. At one-year postnatal, participants were also asked to Antenatal 6 weeks 6 months 1 year report anal incontinence symptoms using the Manchester % (n=466) % (n=404) % (n=397) % (n=336) Health Questionnaire (Bugg et al, 2001). This mirrors the Kings Health Questionnaire but explores anal incontinence Frequency of micturition 72.3 34.6 36.6 23.8 symptoms. Nocturia 76.2 35.6 35.1 21.7 In order to reduce obstetric and social variables, the research only recruited women who had no previous children Urgency 37.3 22.8 23.6 20.2 and were not suffering from any medical condition that may Urge incontinence 23.5 21.2 21.4 16.4 predispose them to continence problems. Stress incontinence