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Stress Urinary Incontinence Cure

Pelvic Floor Muscle Training and Adjunctive Therapies for the Treatment of Stress Urinary Incontinence in Women: a Systematic Review
Patricia B Neumann1, Karen A Grimmer2 and Yamini Deenadayalan: 1PhD candidate, School of Health Sciences, University of South Australia, Adelaide, Australia, 2Director, Centre for Allied Health Evidence, University of South Australia, Adelaide, Australia, 3Research Assistant, Centre for Allied Health Evidence, University of South Australia, Adelaide, Australia     BMC Women's Health 2006, 6:11     doi:10.1186/1472-6874-6-11
� 2006 Neumann et al; licensee BioMed Central Ltd.: This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Stress Urinary Incontinence Treatment study Abstract

Background of Stress Urinary Incontinence Treatment study

Methods of Stress Urinary Incontinence Treatment study

Type of Outcome Measures of the Urinary Incontinence Treatment study

Assessment of methodological quality

Level of evidence

The level of evidence of each retrieved study was assessed using the Australian National Health & Medical Research Council [24] levels of evidence [see additional file 3] in order to describe potential for bias.

Methodological quality

To evaluate the methodological quality of the included studies for urinary incontinence treatments, each study was critically appraised by two independent reviewers using a purpose-built critical review instrument [see additional files 4 & 5]. The purpose-built instrument was a modification of the tool developed by the McMaster University Occupational Therapy Evidence-Based Practice Research Group [30]. This appraisal tool is a critical review form for quantitative studies considering eight main points: study purpose, literature, study design, sample, outcomes, intervention, results, conclusions and clinical implications. Although this tool was designed for all types of quantitative studies, other authors have recommended a separate tool for each of the two main types of design: experimental and observational studies [31]. We developed our tools drawing on information from the Agency for Healthcare Research and Quality report 'Systems to Rate the Strength of Scientific Evidence' [31] and from the Centre for Reviews and Dissemination, University of York [21]. The modified tool developed for this review provides a maximum quality rating score of 23 for RCTs and a maximum score of 19 for non-RCTs. It was pilot-tested and modified a number of times before implementation to ensure content and face validity, and agreement on its application by the reviewers involved in this review. The final version of the purpose-built instrument was then applied by two reviewers working independently. They then compared critical appraisal scores and resolved disagreements in scoring by discussion.

Details of the quality assessment are provided [see additional files 4 & 5] with studies ranked according to their quality assessment score to provide readers with an overview of their methodological quality. All the studies were then considered for the strength of their evidence, based on the quality score and with particular consideration of the factors which were concerned with control of bias. Studies with a high quality score were considered to show evidence of good control of bias (eg attention to random allocation processes, baseline similarity of groups, reliable outcome measures) as well as other factors concerning quality reporting, such as consideration of ethical processes and relevance of the literature review. Studies with a high quality score are identified and highlighted by the reviewers in the text for their contribution to evidence about treatment outcomes.

Data extraction

Relevant data was extracted from each study in a separate extraction sheet, providing a profile of each study using the following headings:

  • Information about service delivery (health professional and setting/institution)

  • Demographic information about the subjects in the study

  • Study methods

  • Descriptions of the intervention(s)

  • Description of the outcome measure(s)

  • Key results from data analysis � short term and at 12 months

Similar to the process of critical appraisal, both reviewers extracted information independently and where there was disagreement, consensus was reached by discussion or in consultation with a third party

Data synthesis

Because our review included studies of evidence levels II, III and IV (NHMRC 1999), and because study measures were not homogenous, it was not possible to analyse the data by meta-analysis. Thus findings are presented as narrative summaries. In studies with a 'no treatment' or 'usual treatment' control group, analysis of between-group effects were reported in this analysis. In studies without a control group, within-group changes were used to calculate treatment effects. All relevant outcomes ie those fitting the inclusion criteria, were reported, including statistically significant and non-significant findings.

 

Results

Methodological Quality and Description of Studies

The search identified 7760 potentially relevant research reports in the period 1995�2005, of which 24 studies fulfilled the inclusion criteria and hence were considered in this review. Twenty one included studies were English peer-reviewed research reports, three were peer-reviewed conference abstracts with no published full-text report and one was a peer-reviewed foreign language paper with an English language abstract. This English abstract was used for data extraction. There was 100% agreement between the reviewers in terms of study inclusion. Summaries of the studies included in the review are provided in Tables 1 and 2. Studies are presented in order of their quality assessment score with information about the level of evidence, interventions investigated and information to determine the generalisability of the study findings.

Arms of studies were excluded where there was no description of a specific Pelvic Floor Muscle Training protocol. Thus the following arm(s) were excluded: Cammu & van Nylen (1997) [32] (VW only), Sung et al (2000) [33] (ES/BF) and Bo et al (1999) [34](ES, VW).

Hierarchy of Evidence

There was initially 91% agreement (Cohen's Kappa: 0.8) between the reviewers regarding the level of evidence assigned to each study (NHMRC, 1999). A Kappa score of more than 80% is considered to represent 'excellent' agreement and between 60�80% 'substantial' agreement [35]. Complete agreement was reached after discussion.

Seventeen of the 24 studies identified were RCTs [32,34,36-50]. Seven were non-RCTs, of which three were level III-2 studies ie cohort or interrupted time series with a control group [33,51,52] and four were level IV studies ie case-series (before-after investigations) without a control group [53-56].

Methodological Quality of Included Studies

There was initially 83% agreement (Cohen's Kappa: 0.65) between the reviewers regarding the methodological quality of the included studies. After consultation, 100% agreement was reached. The methodological quality of the studies was variable with the highest scoring 100% (23/23) [34] and the lowest (26%) 5/19 [55]. There was no correlation between a more recent date of publication and quality score (Pearson's correlation � 0.03, p > 0.05).

A summary of the quality assessment of the 17 level II studies [see additional file 4] and the seven level III & IV studies [see additional file 5] is provided. The methodological quality of the RCTs varied from 23/23 (100%) [34] to 9/23 (39%) [36]. The methodological quality of the level III and IV studies was also variable with scores from 14/19 (74%) [51] to 5/19 (26%) [55]. Studies with a lower quality score contained a number of sources of bias which should be considered when interpreting the results. However, the four studies in abstract form had limited information for quality assessment contributing to their lower quality scores.

Types of Participants

Women were included with a urodynamic diagnosis of Stress Urinary Incontinence, a clinical diagnosis based on signs and/or symptoms, or a combination of the above [1]. There was considerable variation in the hormonal status and age (18�84 years) of subjects in this review. Two studies [41,56] specifically recruited younger, pre-menopausal women with Stress Urinary Incontinence persisting at least 3 months after the last childbirth. These authors stated that this time was chosen to allow the hormonal changes from pregnancy and parturition to have resolved. Another study [49] also specifically recruited pre-menopausal women. By contrast, Miller et al (1998) recruited older women with a mean age of 68 (range 60�84) and Aksac et al (2003) reported on women with a mean age of 53 (SD 7.2) years who were all using oral hormone replacement therapy. All other studies investigated various combinations of Pelvic Floor Muscle Training and adjunctive therapies in women with a mean age 46�56 (range of 18�80). Some of these studies stated that their populations included women who were both pre- and post-menopausal [33,34,38,43,47,54]. There was therefore considerable heterogeneity in the studies reviewed in terms of possible confounding due to age and hormonal status.

Identification and/or Control of Potential Confounders

The following confounding variables were controlled by stratification in a number of studies: severity of symptoms [34,38,41,47], referral source [34,38,41,47] and parity [34].

The initial severity of incontinence was not always reported and methods used to describe severity varied considerably so that any comparisons should be made with caution (Table 3). Two studies included women with a past history of surgery for incontinence [45,51]. In twelve studies, it was stated that women were excluded if they had prior surgery for incontinence [34,38,41-43,46,47,49,50,52-54] and it was not reported in nine other studies [32,33,36,37,39,40,44,48,56].

Recruitment methods varied across the included publications, which potentially influenced subjects' responses to intervention. In three studies, the participants were volunteers who responded to newspaper advertisements [47] or from outpatient hospital populations [41,56]. In three studies, participants were both volunteers and referred [34,43,44]. In ten other studies, they were referred by a medical practitioner or recruited from a tertiary institution clinic population [33,37,38,45,48-50,52-54] and in the remaining studies the source was not reported [32,36,39,40,42,46,51,55].

Types of Interventions for Urinary Incontinence Treatments

The studies were divided into intervention categories and results summarised according to the different interventions reported: 14 studies reported on Pelvic Floor Muscle Training alone (Table 4), 11 studies on PFMT with BF (Table 5), three studies on PFMT and ES (Table 6), two studies on Pelvic Floor Muscle Training and VW (Table 7), three studies on PFMT with BF and ES (Table 8), one study on PFMT, BF and VW, (Table 9), and one study on Pelvic Floor Muscle Training combined with ES, BF and VW (Table 10). Details of the protocols for the interventions for all studies are detailed in Table 11.

Pelvic Floor Muscle Training

Studies were described by the broad types of Pelvic Floor Muscle Training which were employed, ie specific strength training (inducing muscle hypertrophy) or skill training (improving motor learning), and their exercise dosage (frequency, intensity, duration of the training programs and compliance) [10]. The effect of specifically activating or de-activating the abdominal wall during PFMT was investigated. While reducing abdominal muscle activity has been advocated to isolate the PFM and minimise intra-abdominal pressure (Laycock, 1994), more recently a synergistic activity of the deep abdominal muscles (transversus abdominis and lower fibres of obliquus internus) and PFM has been described [57-59]. Training of the deep abdominal muscles as a treatment for incontinence has been advocated [60] but more recently disputed [10].

Biofeedback

Many different applications of biofeedback were described. Vaginal applications of EMG (electromyography)  [32,36,38,41,42,50,51], pressure devices [44,45,47,48,56] or perineal ultrasound [49,53] were described. Three studies applied surface EMG BF on the surface of the abdominal wall as well to indicate abdominal muscle activity [32,42,50]. The EMG electrodes were placed over the rectus abdominis in one study [50] but the placement was not specified in the other two studies. Vaginal BF was used as a home treatment in three studies [44,45,47], as home and clinic treatment in one study [45] and in the others it was used only at clinic visits. One study [42] used additional rectal pressure BF to monitor intra-abdominal pressure.

Two studies used trans-perineal ultrasound to teach a correct elevating contraction at the first clinic visit [49,53] and in one study ultrasound was repeated for Pelvic Floor Muscle Training on two further occasions [49]. Another study [36] did not provide clear details whether pressure BF was used for teaching only or training as well.

Electrical Stimulation

Electrical stimulation was used in seven studies in different combinations of therapy. [33,39,45,51,52,54,56]. Three studies investigated PF/ES, four studies a combination of PFMT/BF/ES, and one study a combination of PFMT/ES/BF/VW. The application and protocols varied considerably. Two studies used interferential currents with externally applied suction cups with clinic treatment [52,56]. The others used vaginal application either with home stimulation [39,45] or at clinic visits [45,54].

Vaginal Weights

Different types of vaginal weights were used varying from 20 g to 100 g.

Protocols required women to perform activities of daily living while retaining the weight in the vagina [37,49,51], while one [37] required women to perform 'gymnastics' in addition to routine daily activities but no details of this activity or of subjects' compliance were provided. In all three studies women additionally performed a Pelvic Floor Muscle Training program.

Types of Outcomes of Urinary Incontinence Treatment Studies

The Outcomes of Urinary Incontinence Treatment Studies

Discussion about the Result of the Stress Urinary Incontinence Treatment Studies

Conclusion of the Stress Urinary Incontinence Treatment Studies

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Additional file 3: Levels of evidence for assessing intervention studies (NHMRC 1999) [1]

I

Evidence obtained from a systematic review of all relevant randomised controlled trials

II

Evidence obtained from at least one properly-designed randomised controlled trial

III-1

Evidence obtained from well-designed pseudorandomised controlled trials (alternate allocation or some other method)

III-2


 

Evidence obtained from comparative studies (including systematic reviews of such studies) with concurrent controls and allocation not randomised, cohort studies, case-control studies, or interrupted time series with a control group

III-3

Evidence obtained from comparative studies with historical control, two or more single arm studies, or interrupted time series without a parallel control group

IV

Evidence obtained from case series, either post-test or pre-test/post-test

 Additional file 4: Summary of critical appraisal � Randomised controlled trials [1] [2] [3] [4]

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0

1

1

0

1

1

1

1

1

1

0

0

1

0

1

1

1

12

Total

9

15

20

10

23

15

21

21

13

15

15

17

17

22

13

13

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KEY: OM =  Outcome Measure

Additional file 5: Summary of critical appraisal � Non-randomised controlled trials [1] [2] [3] [4]

Citation

Chen 1999

Dumoulin 1995

Balmforth 2004

Turkan 2005

Parkkinen 2004

Sung 2000

Finkenhagen 1998

Total

Study purpose clearly stated

1

1

1

1

1

1

1

7

Ethical processes

1

1

1

1

1

1

0

6

Literature review relevant

1

1

0

1

1

1

0

5

Assessor blinded

0

1

0

0

1

0

0

2

Compliance reported

1

0

0

0

1

0

0

2

No biases present

0

0

0

0

0

0

0

0

Consideration of sample size

0

0

0

0

0

0

0

0

Inclusion/exclusion criteria

1

1

0

1

0

0

0

3

OM clearly described in Intro/methods

0

1

0

0

1

1

1

4

OM reliability stated

0

0

0

0

0

0

0

0

OM validity stated

0

0

0

0

0

0

0

0

Intervention described (to allow replication)

0

1

0

1

1

0

1

4

Results reported in terms of significance

1

1

1

1

1

1

0

6

Analysis appropriate

1

1

1

1

1

1

0

6

Withdrawals/ dropouts reported

1

1

0

1

1

0

0

4

Intention to treat, or no dropouts

1

0

0

1

0

0

0

2

Conclusions appropriate

1

1

1

1

1

1

1

6

Clinical importance reported

1

1

1

1

1

1

1

6

Limitations reported

0

1

0

0

1

0

0

2

Total

11

13

6

11

13

8

5

 

OM =  Outcome Measure

Table 1 [1]
Summary of all studies with interventions, level of evidence, quality rating score and age
Studies Intervention Hierarchy of Evidence a Quality Rating Score (%) Mean age (SD)b

Bo (1999) PFMT v BF v ES v control II 23/23 (100) 49.6 (10)
Morkved (2002) PFMT v PFMT+BF II 22/23 (96) 47.8 (8.2)
Dumoulin (2004)
 
PFMT+ES+BF v PFMT+ES+BF+Ab Ex v control II 21/23 (91) 36.2 (median) (IQ range 23�39)
Bo (2000) PFMT II 21/23 (91) 49.6 (10)
Berghmans (1996) PFMT v PFMT+BF II 20/23 (87) 48 (range 18�70)
Knight (1998)
 
PFMT+BF v PFMT+BF+ES('home') v PFMT+BF+ES('clinic') II
 
17/23 (74)
 
NR (range 24�68)
 
Miller (1998b) PFMT (motor learning) II 17/23 (74) 68.4 (range 60�84)
Parkkinen (2004) PFMT+ES+BF+VW v PFMT+VW III-2 14/19 (74) 46.8 (range 32�65)
Wong (2001) PFMT+BF v PFMT+BF+Ab BF II 16/23 (70) 46 (range 30�62)
Dumoulin (1995) PFMT+ES+BF IV 13/19 (68) 32 (9.5)
Johnson (2001) PFMT (SVC) v PFMT (NMVC) II 15/23 (65) 50 (35�65)
Hay-Smith (2002) A
 
PFMT (motor learning/strength) v PFMT (motor learning) II
 
15/23 (65)
 
48.8 (13.2 SD)
Arvonen (2001) PFMT v PFMT+VW II 15/23 (65) 48 (range 28�65)
Cammu & van Nylen (1998) PFMT+BF v VW
 
II
 
15/23 (65)
 
55.9 (9.5)
 
Turkan (2005) PFMT+ES III-2 11/19 (58) 47.6 (8)
Pieber (1995) PFMT+BF v PFMT+BF+VW II 13/23 (57) 43 (+/- 6)
Chen (1999) PFMT+ES IV 11/19 (58) NS (range 20 to >50)
Glavind (1996) PFMT v PFMT+BF II 13/23 (57) 45 (median)(range 40�48)
Pages (2001)
 
PFMT v BF
 
II
 
13/23 (57)
 
51.1 (range 27�80)
 
Bidmead (2002) A
 
PFMT v PFMT+ES v PFMT+sham ES v control II
 
10/23 (43)
 
NR
 
Sung (2000) PFMT III-2 8/19 (42) range 18 � >60
Aksac (2003) PFMT v PFMT+BF v control II 9/23 (39) 52.9 (7.2)
Balmforth (2004) A PFMT+BF IV 6/19 (32) 49.5 (10.6)
Finkenhagen (1998) A PFMT
 
IV
 
5/19 (26)
 
49 (range 25�67)
 

A = available in English only as abstract; a = According to Australian National Health and Medical Research Council Hierarchy of Evidence (1998); b = Mean age (SD) unless otherwise stated; PFMT = pelvic floor muscle training; ES = electrical stimulation; BF = biofeedback; VW = vaginal weights; PT = physiotherapist; UDS = urodynamics studies; NR = not reported, SVC = submaximal voluntary contraction, NMVC = near-maximal voluntary contraction

Table 2 [1]
Summary of studies with factors pertaining to external validity
Studies
 
Diagnosis
 
Intervention by Setting
 
Excluded if prior surgery Volunteers (V) or Referred (R)

Bo (1999) S, Pad T, UDS PT Multicentre yes V+R
Morkved (2002) S, Pad T, UDS PT NR yes V
Dumoulin (2004) S, Pad T, UDS PT NR yes V
Bo (2000) S, Pad T, UDS PT NR yes NR
Berghmans (1996)
 
S, CST, Pad T, UDS PT
 
PT clinic
 
yes
 
R
 
Knight (1998) UDS PT Tertiary Clinic no NR
Miller (1998) S, CST NR NR yes NR
Parkkinen (2004) S, Pad T, UDS PT Hospital PT clinic no NR
Wong (2001) S, UDS PT Hospital PT clinic yes R
Dumoulin (1995) S, Pad T, UDS PT NR NR V
Johnson (2001) S, UDS NR NR yes V+R
Hay-Smith (2002) S, CST, Pad T PT NR yes V+R
Arvonen (2001) S PT OP PT clinic no R
Cammu & van Nylen (1998) S, UDS
 
PT
 
NR
 
no
 
NR
 
Turkan (2005) S, Pad T, UDS PT University PT clinic yes R
Pieber (1995) UDS PT Urodynamic unit yes R
Chen (1999)
 
S, CST, Pad T, UDS NR
 
NR
 
yes
 
R
 
Glavind (1996) S, Pad T, UDS NR NR yes NR
Pages (2001) S, UDS PT OP hospital clinic no R
Bidmead (2002) UDS PT NR NR NR
Sung (2000) S PT NR NR R
Aksac (2003) UDS Therapist NR NR NR
Balmforth (2004) S, UDS PT NR yes R
Finkenhagen (1998)
 
NR
 
PT
 
PT clinic (primary care) NR
 
NR
 

S = symptoms, Pad T = pad test, CST = cough stress test, UDS = urodynamic studies, NR = not reported, PT = physiotherapist, OP = outpatient

Table 3 [1]
Baseline severity of symptoms: incontinent episodes (IE) and urine loss (g) (pad test)
Study Incontinence Episodes/day IE/week Urine loss (g) (pad test)

Aksac (2003) 20 (1 hour)
Arvonen (2001) 25 (SPT, st.b.vl)
Balmforth (2004) 12.2 (SPT, st.b.vl)
Berghmans (1996) 2�3 28 (48 hr pad test)
Bidmead (2002) 10 (SPT)
Bo (1999) 2.0 per 3 days 38.6 (SPT, st.b.vl.); 14.5 (24 hr pad test)
Bo (2000) 45 (SPT, st.b.vl)
Cammu & van Nylen (1998) 14.4 NR
Chen (1999) 5.5 20 (1 hour)
Dumoulin (1995) 74.4 (SD 84.3) (SPT, st.b.vl)
Dumoulin (2004) PF group: 12.5 g: PF+ abs group: 20 g (SPT, st.b.vl)
Finkenhagen (1998) NR
Glavind (1996) 10.9 (SPT, st.b.vl)
Hay-Smith (2002) 1.8