[Diagnostic testing of female urinary incontinence: dos and dont's]

Urinary incontinence causes significant limitations in quality of life and reduces mental and physical health. It is a widespread and chronic disease. About 200 million people are affected by urinary incontinence worldwide. Females are more often affected than males. For the therapy of female urinary incontinence various conservative and surgical treatment measures are available. A comprehensive diagnostic work-up is crucial for effective and successful use of those therapeutical measures. The current paper gives a review of diagnostic options for female urinary incontinence: from non-invasive up to invasive investigations. It presents potential pitfalls and possibilities for improving the diagnostic work-up.

Longer is better than shorter: The added value of the seven-day pad test in the post-radical prostatectomy urinary incontinence

AIMS

To investigate the feasibility and reliability of the seven-day pad test (7DPT), the correlation between 7DPT and 24-hour pad test (24HPT), and International Consultation on Incontinence Questionnaire-Short Form (ICIQ-SF) questionnaire, and the different categorization by the severity of each pad test. Pad weighting tests have been recommended in the evaluation of post-radical prostatectomy urinary incontinence severity, being considered the 24HPT gold standard. Some authors consider that the longer the testing, the better assessment. We propose a self-filled pad weight, the 7DPT.

METHODS

A prospective study of incontinent male patients after radical prostatectomy. We carried out the study in two phases. All patients underwent urodynamic study. The first phase evaluated the feasibility and reliability of 7DPT. The second evaluated the correlation between 7DPT, 24HPT, and ICIQ-SF questionnaire in a larger sample.

RESULTS

First phase: 32 patients were recruited. Test-retest reliability was excellent, with good agreement between mean 7DPT and 24HPT. The number of pads and mean 7DPT showed a good correlation. Second phase: 72 patients were screened, 51 (71%) met inclusion criteria. Mean 7DPT and 24HPT showed a strong association. Mean 7DPT and 24HPT correlated moderately with ICIQ-SF score. 7DPT and 24HPT agreement with ICIQ-SF groups was slight. As 7DPT captures better days with maximum urinary leakage, up to 12 patients would have been misclassified according to 24HPT (number need to treat for 7DPT was seven).

CONCLUSIONS

7DPT is a feasible and reliable tool to evaluate post-radical prostatectomy urinary incontinence, with a strong correlation with the 24HPT and moderate with the ICIQ-SF.

[Circumstances that may decrease the reliability of instruments to assess male urinary incontinence]

OBJECTIVE

To identify situations that may alter the results of the 1-hour and 24-hour Pad test and the short-form International Consultation in Incontinence Questionnaire (SF-ICIQ).

PARTICIPANTS

Five physiotherapists, who conducted the interviews and treatment of 81 patients undergoing radical prostatectomy.

METHOD

A qualitative descriptive phenomenological study was carried out, using a focus group technique with five people (4 women and 1 man) responsible for the treatment and assessment of patients with urinary incontinence after prostatectomy. Recordings were transcribed and the Atlas.ti7 programme was used to carry out the coding of the variables.

RESULTS

Important factors were identified in the use of measuring instruments for the diagnosis and assessment of urinary incontinence in all the tools used.

CONCLUSIONS

Some situations can modify the objectivity of the various tests for the assessment of urinary incontinence. Some of the factors identified were lower fluid intake, less activity, use of manual clamp or urinals to avoid leakage, as well as the interference of certain drugs.

Correlation between the 1-hour and 24-hour pad test in the assessment of male patients with post-prostatectomy urinary incontinence

INTRODUCTION

This study is aimed at studying the correlation between the 1-hour and 24-hour pad tests for urinary incontinence following prostatectomy; the second objective is to check whether the severity level established by both tests is adequate for male urinary incontinence.

MATERIAL AND METHODS

The study population includes patients who had undergone prostatectomy at a single center between February 2015 and December 2016, using 159 measurements consisting of 24-hour and 1-hour pad tests, belonging 45 patients. Both tests have been performed according to the protocol standardized by the International Continence Society. Once all the data have been obtained, the levels marked by each of the pads have been established, and the statistical analysis has started.

RESULTS

The relationship between the amounts recorded in grams by the two test is highly significant (P=0.000), however, when comparing the incontinence levels established by each test (mild, moderate and severe), discrepancies have been found. The median of the severe cases in the 24-hour pad test was 389.5 grams, and in the 1-hour pad test was 92 grams. So, patient's loss values are well above the cut-off point defined for severe urinary incontinence in both 24-hour (50 grams) and 1-hour pad test (75 grams).

CONCLUSIONS

There is a diagnostic discrepancy between the 24-hour pad test and the 1-hour pad test in terms of defined urinary incontinence severity levels. In our opinion, these levels should be redefined for male urinary incontinence since the amount of urine loss is well above the threshold established for severe incontinence.

LEVEL OF EVIDENCE

4.

Assessing variability of the 24-hour pad weight test in men with post-prostatectomy incontinence

Purpose:

Decision-making regarding surgery for post-prostatectomy incontinence (PPI) is challenging. The 24-hour pad weight test is commonly used to objectively quantify PPI. However, pad weight may vary based upon activity level. We aimed to quantify variability in pad weights based upon patient-reported activity.

Materials and Methods:

25 patients who underwent radical prostatectomy were prospectively enrolled. All patients demonstrated clinical stress urinary incontinence without clinical urgency urinary incontinence. On three consecutive alternating days, patients submitted 24-hour pad weights along with a short survey documenting activity level and number of pads used.

Results:

Pad weights collected across the three days were well correlated to the individual (ICC 0.85 (95% CI 0.74–0.93), p<0.001). The mean difference between the minimum pad weight leakage and maximum leakage per patient was 133.4g (95% CI 80.4–186.5). The mean increase in 24-hour leakage for a one-point increase in self-reported activity level was 118.0g (95% CI 74.3–161.7, p<0.001). Pad weights also varied significantly when self-reported activity levels did not differ (mean difference 51.2g (95% CI 30.3–72.1), p<0.001).

Conclusions:

24-hour pad weight leakage may vary significantly on different days of collection. This variation is more pronounced with changes in activity level. Taking into account patient activity level may enhance the predictive value of pad weight testing.

Pelvic floor muscle reflex activity during coughing - an exploratory and reliability study

OBJECTIVES

Activities that provoke stress urinary incontinence (SUI) rapidly increase the intra-abdominal pressure and the impact loading on the pelvic floor muscles (PFMs). Coughing can cause urinary leakage and is often used to test SUI. However, PFM characteristics during coughing, including their reliability, have not been investigated. Here, we used electromyography (EMG) to describe PFM pre-activity and reflexivity during coughing and examined the reliability of the measurements.

METHODS

This was an exploratory and reliability study including 11 young healthy women to characterize EMG reflex activity in PFMs during coughing. We describe 6 variables, averaged over 3 coughs per subject, and tested their reliability (intraclass correlation coefficient 3,1 [ICC(3,1)] and ICC(3,k), related standard error of measurement (SEM) and minimal difference [MD]). The variables represented the mean EMG activity for PFMs during 30-ms time intervals of pre-activity (initial time point of coughing [T0] and minus 30ms) and reflex activity (T0-30, 30-60, 60-90, 90-120 and 120-150ms after T0) of stretch-reflex latency responses.

RESULTS

The mean %EMG (normalized to maximal voluntary PFM contraction) for EMG variables was 35.1 to 52.2 and was significantly higher during coughing than for PFM activity at rest (mean 24.9±3.7%EMG; P<0.05). ICC(3,k) ranged from 0.67 to 0.91 (SEM 6.1-13.3%EMG and MD 16.7-36.8%EMG) and was higher than ICC(3,1) (range 0.40-0.77; SEM 9.0-18.0%EMG, MD 24.9-50.0%EMG).

CONCLUSIONS

PFM activity during reflex latency response time intervals during coughing was significantly higher than at rest, which suggests PFM pre-activity and reflex activity during coughing. Although we standardized coughing, EMG variables for PFM activity showed poor reliability [good to excellent ICC(3,k) and fair to excellent ICC(3,1) but high SEM and MD]. Therefore, coughing is expected to be heterogeneous, with low reliability, in clinical test situations. Potential crosstalk from other muscles involved in coughing could limit the interpretation of our results.

Correlation of patient perception of pad use with objective degree of incontinence measured by pad test in men with post-prostatectomy incontinence: the SUFU Pad Test Study

PURPOSE

Many investigators have used the number of pads to determine the severity of post-prostatectomy incontinence and yet the accuracy of this tool remains unproven. We determined whether the patient perception of pad use and urine loss reflects actual urine loss. We also identified a quality of life measure that distinguishes patients by severity of incontinence.

MATERIALS AND METHODS

We prospectively enrolled 235 men from a total of 18 sites 6 months or more after radical prostatectomy who had incontinence requiring protection. Patients completed a questionnaire on the perception of pad number, size and wetness, a quality of life question, several standardized incontinence questionnaires and a 24-hour pad test that assessed pad number, size and weight. SPSS® was used for statistical analysis.

RESULTS

Perception of the number of pads used closely agreed with the number of pads collected during a 24-hour pad test. Perceived and actual pad size had excellent concordance (76%, p <0.001). Patients with wet and soaked pads had statistically and clinically significantly different pad weights that were uniquely different from each other and from those of patients who were almost dry and slightly wet. Response to the quality of life question separated the men into 4 statistically significantly different groups based on mean 24-hour pad weight.

CONCLUSIONS

Patients accurately described the number, size and degree of wetness of pads collected during a 24-hour pad test. These values correlated well with actual urine loss. The single question, "To what extent does urine loss affect your quality of life?" separated men into distinct categories.

Pad count is a poor measure of the severity of urinary incontinence

PURPOSE

We analyzed the correlation between pad use, as determined by objective pad count, and the severity of urinary incontinence, as measured by pad weight.

MATERIALS AND METHODS

We performed a retrospective study of consecutive incontinent patients who wore pads on a daily basis and were instructed to complete a 24-hour pad test. They were told to use the usual pads, change them as usual and place each in a separate plastic bag the day before the scheduled appointment. All pads were weighed and total urine loss was calculated by subtracting dry pad weight from wet pad weight, assuming that a 1 gm weight increase was equivalent to 1 ml of urine loss. The number of pads was correlated to pad weight using the Spearman rank correlation coefficient due to the nonparametric nature of the data.

RESULTS

The 116 patients included 51 men 39 to 89 years old (mean age 66) and 65 women 27 to 95 years old (mean age 72). When comparing the number of pads used to the gm of urine lost, the Spearman ρ was 0.26 (p=0.005) in the total cohort, and 0.40 and 0.26 (each p<0.05) in males and females, respectively.

CONCLUSIONS

There was little correlation between the number of pads used and the severity of urinary incontinence (r=0.26). These data suggest that pad count should not be used as an objective measure of incontinence severity. Instead, pad weight on a 24-hour pad test should be used.

Transvaginal electrical stimulation with surface-EMG biofeedback in managing stress urinary incontinence in women of premenopausal age: a double-blind, placebo-controlled, randomized clinical trial

Introduction and hypothesis

The aim of this study was to evaluate the results of conservative treatment of urodynamic stress urinary incontinence (SUI) using transvaginal electrical stimulation with surface-electromyography-assisted biofeedback (TVES + sEMG) in women of premenopausal age.

Methods

One hundred and two patients with SUI were divided into two groups: active (n = 68) and placebo (n = 34) TVES + sEMG. The treatment lasted for 8 weeks and consisted of two sessions per day. Women were evaluated before and after the intervention by pad test, voiding diary, urodynamic test, and the Incontinence Quality of Life Questionnaire (I-QOL).

Results

Mean urinary leakage on a standard pad test at the end of 8th week was significantly lower in the active than the placebo group (19.5 ± 13.6 vs. 39.8 ± 28.5). Mean urinary leakage on a 24-h pad test was significantly reduced in the active group at the end of 8th and 16th weeks compared with the placebo group (8.2 ± 14.8 vs. 14.6 ± 18.9 and 6.1 ± 11.4 vs. 18.2 ± 20.8, respectively). There was also a significant improvement in muscle strength as measured by the Oxford scale in the active vs the placebo group after 8 and 16 weeks (4.2 vs 2.6 and 4.1 vs 2.7, respectively). No significant difference was found between groups in urodynamic data before and after treatment. At the end of 8th week, the mean I-QOL score in the active vs the placebo group was 78.2 ± 17.9 vs 55.9 ± 14.2, respectively, and at the end of 16th week 80.8 ± 24.1 vs. 50.6 ± 14.9, respectively.

Conclusion

Our study showed that TVES + sEMG is a trustworthy method of treatment in premenopausal women with SUI; however, its reliability needs to be established.

Outcome of midurethral tape continence surgery in patients with and without urodynamically confirmed stress incontinence

OBJECTIVE

To compare the outcomes of midurethral tape continence surgery in patients with urodynamically confirmed stress incontinence (USI) and patients with symptoms of stress urinary incontinence but normal urodynamic studies (NUDS) and a positive 1-h pad test.

STUDY DESIGN

Analysis of data collected prospectively from 356 women who underwent tension-free vaginal tape (TVT) surgery from June 1998 to September 2009. There were 25 women with NUDS but a positive pad test. Outcome measures in these 25 women were compared with 65 women with urodynamically confirmed stress incontinence. These 65 women were chosen as suitable controls from the group of 331 potential controls. All the women underwent TVT surgery under local or spinal anaesthesia.

RESULTS

The outcome measures were: (1) absence of stress urinary incontinence symptoms, (2) new occurrence of lower urinary tract irritative symptoms (LUTS), (3) persistent voiding dysfunction (VD), and (4) recurrent urinary tract infections (UTIs). Following TVT, stress incontinence was absent in 100% and 97% of patients in the NUDS and USI groups respectively. The occurrence of LUTS was 4% and 4.6% in the NUDS and USI groups, while VD was found in 4% and 4.6% and recurrent UTIs in 8% and 6.1% of the groups respectively.

CONCLUSION

There were no significant differences in outcomes following TVT in patients with and without urodynamically confirmed stress urinary incontinence.