Predictors of variability in urinary incontinence and overactive bladder symptoms

Pilot Study of a Digital Behavioral Therapy for Overactive Bladder in Women

IMPORTANCE

The burden and high prevalence of overactive bladder (OAB) underline the urgent need for effective treatment. This study provides an initial look at an alternative approach to behavioral therapy for overactive bladder (OAB) that is delivered as an app on a smartphone.

OBJECTIVE

This study aimed to investigate feasibility, acceptability, and preliminary efficacy of a digital therapeutic for OAB.

STUDY DESIGN

This was a multicentered prospective pilot study. We used a convenience sample (N = 30) from waiting lists of women referred for incontinence, excluding urinary tract infections, urinary retention, bladder pain syndrome, pelvic cancer, current pregnancy, kidney disease, dementia, stroke, and prior neuromodulation. The intervention, a smartphone app, provided an 8-week program with weekly modules combining evidence-based knowledge videos and skill-building exercises that incorporated behavioral therapy, cognitive behavioral therapy, pelvic muscle training, and general health information. Combined scores on the International Consultation on Incontinence Questionnaire was the primary outcome measure. Secondary outcomes included improvement in quality of life, based on International Consultation on Incontinence Questionnaire, a 72-hour urinary diary, and Patient Global Impression of Improvement. We evaluated usability with the Mobile Application Rating Scale. Statistical tests included Shapiro-Wilk tests and paired-sample t tests.

RESULTS

Overall, 100% of participants reported a reduction in their OAB symptoms and 82% reported an improvement in quality of life. There was a significant improvement in diary parameters, including frequency (10.19-6.71 a day: SD, 1.25; P = 0.017) and incontinence (10-3.57: SD, 4.58). Participants rated the app highly on functionality, and 70% would recommend it. Patient Global Impression of Improvement improved for 72% of participants.

CONCLUSIONS

This study supports the application of a digital platform to over-come the real-world barriers for first-line treatment for OAB and offers information to inform further evaluation of the safety and efficacy of the NUIG OAB App.

Does transition of urinary incontinence from one subtype to another represent progression of the disease?

INTRODUCTION AND HYPOTHESIS

Mixed urinary incontinence (UI) is, on average, more severe than urgency UI or stress UI. We tested the hypothesis that mixed UI is a more advanced stage of UI by comparing transition probabilities among women with stress, urgency, and mixed UI.

METHODS

We used data from the General Longitudinal Overactive Bladder Evaluation Study-UI, which included community-dwelling women, aged 40+ years, with UI at baseline. Study participants completed two or more consecutive bladder health surveys every 6 months for up to 4 years. Using sequential 6-month surveys, transition probabilities among UI subtypes were estimated using the Cox-proportional hazards model, with the expectation that probabilities from stress or urgency UI to mixed UI would be substantially greater than probabilities in the reverse direction.

RESULTS

Among 6,993 women 40+ years of age at baseline, the number (prevalence) of women with stress, urgency, and mixed UI was 481 (6.9%), 557 (8.0%), and 1488 (21.3%) respectively. Over a 4-year period, the transition probabilities from stress UI (34%) and urgency UI (27%) to mixed UI was significantly higher than probabilities from mixed to stress UI (6%) or to urgency UI (rate = 9%). The adjusted transition hazard ratio for stress UI and urgency UI was 2.06 (95% CI: 1.73-2.92) and 1.85 (95% CI: 1.63-2.57) respectively compared with mixed UI.

CONCLUSION

The substantially higher transition from stress UI and urgency UI to mixed UI supports the hypothesis that mixed UI might represent a more advanced stage of UI that may have implications for understanding disease progression.

Clinical epidemiological insights into urinary incontinence

INTRODUCTION AND HYPOTHESIS

Urinary incontinence (UI) is very common and heterogeneous among women with limited knowledge of progression or prognosis. Evidence based on clinical epidemiology can help to better understand the natural history of UI.

METHODS

We examine the challenges of UI definition and its subtypes, its impact on quality of life and health-seeking behavior. We review the proposed pathophysiology of UI subtypes and known risk factors as they relate to our current knowledge of the disease state. Finally, we emphasize the role of epidemiology in the process of acquiring new insight, improving knowledge, and translating this information into clinical practice.

RESULTS

Stress UI is most common overall, but mixed UI is most prevalent in older women. The three UI subtypes have some common risk factors, and others that are unique, but there remains a significant gap in our understanding of how they develop. Although the pathophysiology of stress UI is somewhat understood, urgency UI remains mostly idiopathic, whereas mixed UI is the least studied and most complex subtype. Moreover, there exists limited information on the progression of symptoms over time, and disproportionate UI health-seeking behavior. We identify areas of exploration (e.g., epigenetics, urinary microbiome), and offer new insights into a better understanding of the relationship among the UI subtypes and to develop an integrated construct of UI natural history.

CONCLUSION

Future epidemiological strategies using longitudinal study designs could play a pivotal role in better elucidating the controversies in UI natural history and the pathophysiology of its subtypes leading to improved clinical care.

Mapping of the OAB-SF Questionnaire onto EQ-5D in Spanish Patients with Overactive Bladder

BACKGROUND AND OBJECTIVE

Mapping disease-specific measures onto generic preference-based indexes allows estimating utility values in specific conditions to determine gain of quality-adjusted-life-years when the status of condition varies. The aim of this study was to map a disease specific scale, the Overactive Bladder Questionnaire 5-dimensional health classification system (OAB-5D) derived from the Overactive Bladder questionnaire-Short Form (OABq-SF), onto a preference-based scale, the EuroQol-5D (EQ-5D), in a sample of patients with overactive bladder (OAB) in a Spanish population.

METHOD

A survey addressed to value the health states was conducted among 246 patients at 18 clinics of urology from Spain. A total of 43 out of 243 possible health states have been valued, using VAS (Visual Analog Scale) and TTO (time trade-off) techniques. In addition, ordinary least squares (OLS), generalized linear models (GLM) and Tobit models were estimated. Resulting models were compared and the best one was selected in terms of goodness of fit measures, attribute sign, coefficient magnitude, and statistical significance of regression coefficients. Finally, the internal validity of the best model was calculated by bootstrap resampling.

RESULTS

The best model to map the OAB-5D onto EQ-5D could be estimated and the stability of parameter estimations was proved. The mentioned model estimated through OLS regression attained R (2) value of 0.892, with the aggregated data; with GLM (efficient maximum likelihood regression), Pearson χ (2) of 15.3 has been obtained; AIC (Akaike information criterion) = -550.9 and BIC (Bayesian information criterion) = -475.4. OLS model included the following OABq-SF items (and range of weights): A1 (0.102, 0.216); A3 (0.070, 0.171); B3 (0.071, 0.078); B1 (0.076, 0.136); B2 (-0.132, -0.028).

CONCLUSION

It is possible to map the OAB-5D scores onto EQ-5D in the Spanish population, allowing estimating EQ-5D utility scores from OAB specific health conditions.

Mixed Incontinence Masked as Stress Induced Urgency Urinary Incontinence

PURPOSE

We sought to understand variations in the expression and temporal relation of bladder control episodes among women with mixed urinary incontinence.

MATERIALS AND METHODS

A random sample of women 40 years old or older with mixed urinary incontinence on GLOBE-UI (General Longitudinal Overactive Bladder Evaluation-Urinary Incontinence) was recruited in a digital daily diary study using a smartphone application. When a bladder control event occurred, women were instructed to answer episode specific questions. Episodes were defined as urgency, and urinary incontinence with and urinary incontinence without urgency. Women and episodes were compared by the type of activity preceding each episode. Urinary incontinence episodes were further defined as stress urinary incontinence, urgency urinary incontinence, stress induced urgency urinary incontinence and other. The chi-square and Wilcoxon tests were used for categorical and continuous variables, respectively.

RESULTS

Of 40 women with a mean age of 65.5 years 35 provided complete 30-day diary data. Of the 950 bladder control episodes reported 25% were urgency only, 55% were urinary incontinence with urgency and 19% were urinary incontinence without urgency. Of the urinary incontinence episodes without urgency 82% occurred after a stress activity (eg coughing or sneezing). Notably, a stress activity also occurred just before 52.5% of the urgency urinary incontinence episodes (p <0.001). A total of 24 women (69%) reported at least 1 episode of stress induced urgency urinary incontinence, which was the most prevalent urinary incontinence subtype episode, followed by urgency urinary incontinence and stress urinary incontinence (29% vs 27% and 16%, respectively). The mean number of daily episodes was 1 or 2 across all groups.

CONCLUSIONS

Women with mixed urinary incontinence express a heterogeneous set of bladder control episodes with stress induced urgency urinary incontinence as the dominant type.

Clinical validation of the Bladder Health Survey for urinary incontinence in a population sample of women

INTRODUCTION AND HYPOTHESIS

Our aim was to clinically validate the Bladder Health Survey (BHS) for detecting urinary incontinence (UI) in population-based surveys.

METHODS

A random sample of women ≥40 years was recruited from primary care practices. We assessed the BHS content validity with an expert advisory board. Test-retest reliability of UI questions was measured. BHS UI definitions included noncases, active (more than three symptoms in the prior 6 months), inactive (past but no current symptoms), and incident (new onset over the past 2 years) cases. To assess criterion validity, we compared BHS diagnosis to an expert clinical diagnosis using structured history, pelvic exam, voiding diary, and urodynamics (if needed). Construct validity was assessed comparing the BHS UI score and case status to Sandvik's score.

RESULTS

Among 322 patients, the BHS identified 17 % as noncases, 70 % as active, 10 % as inactive, and 3 % as incident cases. Using the clinical diagnosis as the gold standard, the percent of true-positive UI cases was 98 % (active), 84 % (inactive), and 80 % (incident). A total of 75 % of BHS noncases were true negatives. The receiver operating characteristic c-statistic was 0.86. Sensitivity and specificity of the BHS were 91 % and 84 %, respectively. The Sandvik score for active cases (median = 4) was significantly greater than it was for inactive (median = 1), incident (median = 1), and noncases (median = 0) (p < 0.001). The BHS UI score was significantly correlated with the Sandvik severity score (r = 0.68, p < 0.01).

CONCLUSION

The BHS is highly reliable, with robust content and construct validity for detecting UI for use in population samples.

Are blood vessels a target to treat lower urinary tract dysfunction?

Bladder dysfunction is common in the general population (Stewart et al. 2010) and even more so among patients seeing a physician for any reason (Goepel et al. 2002). It often manifests as lower urinary tract symptoms (LUTS), a term originally coined to describe voiding and storage symptoms in men with benign prostatic hyperplasia (BPH) but now more universally used to describe any type of voiding and storage symptoms in both sexes. Studies into possible causes of urinary bladder dysfunction have long focused on detrusor smooth muscle cells (Turner and Brading 1999). More recently, it became clear that several other types of cells and organs contribute to regulating detrusor smooth muscle function. These include the urothelium (Andersson and McCloskey 2014; Michel 2015), afferent nerves (Michel and Igawa 2015; Yoshimura et al. 2014b), and the central and autonomic nervous systems (Fowler and Griffiths 2010; Yoshimura et al. 2014a). Alterations in any of these may at least partly be responsible for detrusor dysfunction and, accordingly, be potential targets for the treatment of bladder dysfunction. As highlighted by an article in this issue of Naunyn-Schmiedeberg's Archives of Pharmacology (Bayrak et al. 2015), there is an additional suspect, the bladder vasculature. This article will discuss the currently available experimental and clinical evidence for a role of the vasculature in causing bladder dysfunction, and how existing and emerging treatments may modulate bladder function by acting on blood vessels. Due to a similarity in concept, data on prostate perfusion will also be discussed to some extent.

Is there a link between overactive bladder and the metabolic syndrome in women? A systematic review of observational studies

OBJECTIVES

To conduct a systematic review to determine whether there is an association between metabolic syndrome (MetS) and lower urinary tract symptoms (LUTS) or overactive bladder (OAB) in women.

METHODS

We systematically reviewed English language observational studies on the effect of MetS (or component factors) on the presence of OAB or LUTS in women. We searched PubMed, Web of Science and The Cochrane Library with no date restrictions, checked reference lists and undertook citation searches in PubMed and Google Scholar. Studies were assessed for risk of bias. Because of heterogeneity, results were not pooled, but are reported narratively.

RESULTS

Of 27 included studies, only three looked at the link between MetS and OAB. The rest looked at links between OAB and components of MetS such as obesity or insulin resistance (n = 10), between MetS and urinary symptoms (n = 3) and between urinary symptoms and components of MetS, such as obesity (n = 14). Evidence is currently limited, but it does suggest that there may be important links between MetS and OAB and components of MetS such as obesity.

CONCLUSIONS

The literature on MetS and OAB or LUTS in women is limited, and poor quality. However, the evidence available on obesity appears to support MetS as a contributor and predictor of LUTS in women. Many of the women with LUTS will be overweight and will have features of the MetS, if looked for. This provides not only an opportunity to encourage weight loss as an adjunct to therapy for the OAB symptoms but also a window of opportunity to address cardiovascular risk factors and prevent future cardiovascular morbidity and mortality.

The interaction of stress and urgency urinary incontinence and its effect on quality of life

INTRODUCTION AND HYPOTHESIS

The objective was to estimate the impact of stress and urgency urinary incontinence (UI) on the quality of life (QOL), and to determine whether the impact varies according to UI severity.

METHODS

We used data from the General Longitudinal Overactive Bladder Evaluation-UI study in women. Stress and urgency UI symptom severity scores ranged from 0 to 8. We used logistic regression to test the relation among different severity levels of stress and urgency UI, and their interaction with the Incontinence Impact Questionnaire (IIQ-7). This was categorized according to percentage ranges as 0-40% (reference), 41-80%, and 81-100%.

RESULTS

Both stress and urgency UI were significantly associated with IIQ-7. Higher scores had higher odds ratios (ORs). The OR for urgency vs stress UI was greater at the same severity level. For instance, comparing IIQ-7 quintiles (0-40% vs 41-80%), the OR for an association with an urgency UI score of 5-6 was 5.27 (95% CI = 3.78-7.33) vs 2.76 (95% CI = 2.07-3.68) for a stress UI score of 5-6. Both UI subtypes were more strongly related to the upper (81-100%) than the to the lower (41-80%) quintiles. There was a strong positive urgency UI and stress UI interaction with the upper (i.e., 81-100%) but not the two next lower (41-80%) quintiles.

CONCLUSION

The impact of UI subtypes on QOL varies according to the score of IIQ-7, stress and urgency UI, and their interaction. Urgency vs stress UI has a stronger impact. The effect is greatest for high IIQ-7 scores with a significant share mediated by the interaction of the two UI subtypes.

The iceberg of health care utilization in women with urinary incontinence

INTRODUCTION AND HYPOTHESIS

The objective of the study was to estimate prevalence of urinary incontinence (UI) health care utilization in women from the population up to specialty care.

METHODS

The General Longitudinal Overactive Bladder Evaluation-UI (GLOBE-UI) is a population-based study on the natural history of UI in women  ≥  40 years of age. Prevalence of UI was estimated by using the Bladder Health Survey (BHS). Survey data were linked with electronic health records to build the different steps of the iceberg of disease. Descriptive statistics were used to estimate the prevalence estimates at all levels of the iceberg.

RESULTS

A total sample of 7,059 women received the BHS. Of those, 3,316 (47 %) responded. Prevalence of UI was 1,366 (41 %). Women with or without UI did not differ by age or marital status. However, women with versus without UI were more parous (91 vs 87 %), significantly more overweight or obese (74 vs 61 %), and more likely to have a college education or higher (54 vs 46 %), P < 0.01. Nine hundred fifty-eight (73 %) women with UI reported duration of more than 2 years and 72 % reported moderate to severe UI symptoms. Of all 1,366 women with BHS UI diagnosis, only 339 (25 %) sought care, 313 (23 %) received some care, and 164 (12 %) received subspecialty care.

CONCLUSIONS

UI is a highly prevalent disease. Only a minority with UI appears to seek care and a fraction sees a pelvic floor specialist. It is important not only to educate women, but also primary care providers about this highly prevalent yet treatable condition.

Predictors of care seeking in women with urinary incontinence

AIMS

To determine predictors of health care utilization in women with urinary incontinence (UI) from the population to specialty care.

METHODS

The General Longitudinal Overactive Bladder Evaluation-UI is a population-based study on the natural history of UI in women ≥40 years of age. Prevalence of UI was estimated using the Bladder Health Survey (BHS). Survey data were linked with electronic health records (EHRs) to examine factors associated with a clinical UI diagnosis using logistic regression. Risk factors analyzed included: UI symptoms, subtypes, bother, severity, duration, and effect on quality of life, and demographic and other health characteristics. All statistical tests were two-sided with a P-value < 0.05 being significant.

RESULTS

The overall prevalence of any UI based on responses to the BHS was 1,618/4,064 (40%). Of the 1,618 women with UI, there were only 398 (25%) women with EHR (clinical) diagnosis of UI. Women with UI versus those without UI were more likely to be have a BMI >25 kg/m(2) (70% vs. 58%), more likely to be parous (91% vs. 87%) and college educated (54% vs. 46%), P < 0.001. After adjusting for confounders in the model, variables significantly associated with clinical UI diagnosis included: older age (OR = 1.96), higher parity (> 1 birth) (OR = 1.76), higher urgency UI (OR = 1.08), adaptive behavior (OR = 1.2), and UI bother scores (OR = 1.01), as well as more frequent outpatient visits (OR = 1.03), P < 0.05.

CONCLUSIONS

UI is a highly prevalent condition with only a minority of women seeking care. Factors associated with health care utilization include older age, parity (1+), number of doctor visits, urgency UI subtype, UI bother, and impact on behavior.

Prevalence of urinary incontinence in a random sample of the urban population of Pouso Alegre, Minas Gerais, Brazil

This study determines and analyzes the prevalence of Urinary Incontinence (UI) and its demographic and clinical predictors. This epidemiological and cross-sectional study was approved by the Research Ethics Committee of the University of São Paulo, Nursing School. The sample was randomly selected by cluster technique and included 519 individuals aged≥18 years, living in 341 houses in urban areas. Data were analyzed through Chi-Square, Hosmer Lemeshow's test and multivariate logistic regression (stepwise). Prevalence rates were standardized by gender and age. Of the 519 people composing the sample: 20.1% had UI, 32.9% were women and 6.2% were men. Longer duration of losses (OR=29.3; p<0.001), diabetes mellitus (OR=17.7; p<0.001), stroke (OR=15.9; p<0.001), and cystocele (OR=12.5; p<0.001) were the factors most strongly associated with UI. This study enabled the identification of UI epidemiology and can contribute to the development of public policies for its primary and secondary prevention and treatment, even if such measures are initially implemented at the city level.

Parity is not associated with urgency with or without urinary incontinence

INTRODUCTION AND HYPOTHESIS

Evidence varies on the relation between parity and urgency or urge incontinence (UUI). We used data from the General Longitudinal Overactive Bladder Evaluation to determine whether differences in case definitions could account for variation in findings.

METHODS

We simulated case criteria to correspond to studies of urgency, UUI, and parity using data from 1,880 patients. Logistic models were run for each case-control scenario corresponding to previously used case definitions.

RESULTS

Parity was significantly associated with urgency (odds ratios (OR) 1.70; CI: 1.30-2.22) and UUI (odds ratios (OR) 1.87; CI: 1.34-2.60) only when the case criteria included individuals with stress incontinence (SUI). Parity was not associated with UUI when individuals with SUI were excluded or with urgency when individuals with incontinence were excluded.

CONCLUSIONS

Neither urgency nor UUI symptoms appear to be associated with parity among women 40 years of age and older. Previous associations appear to be explained by inclusion of individuals with SUI.