Development of a Predictive Model for the Diagnosis of Lower Urinary Tract Obstruction in Men.

PURPOSE: We sought to develop and validate a bladder outlet obstruction predictive model for men with nonneurogenic lower urinary tract symptoms. MATERIALS AND METHODS: We retrospectively included 1,148 patients who underwent a urodynamic study in the Urology Service of the Burgos University Hospital from January 2007 to December 2019. Obstruction was defined using the Abrams-Griffiths number. A multivariable logistic regression analysis was conducted to determine the predictors of bladder outlet obstruction. We transferred these data to a model to calculate the individual probability of obstruction. RESULTS: A first group with 563 patients randomly divided was selected for the design of the predictive risk model and a second group of 585 patients for the validation. A total of 331 patients (58.8%) in the development group and 381 (65.1%) in the validation group had a diagnosis of obstruction. A multivariable logistic regression model showed that age, history of previous surgical intervention, presence of voiding symptoms, preserved anal tone, maximum urinary flow rate and voiding efficiency were significant for predicting obstruction. The model had an area under the receiver operating characteristic curve of 0.78 (95% CI 0.75-0.82) and a model validation of 0.78 (0.72-0.83). CONCLUSIONS: Our proposed model based on clinical and noninvasive urodynamics parameters allows us to predict the risk of presenting bladder outlet obstruction in patients with lower urinary tract symptoms.

The 3-day bladder diary is a feasible, reliable and valid tool to evaluate the lower urinary tract symptoms in women.

AIMS: To evaluate the feasibility (% of completion), reliability (test-retest and inter-observer) and validity (convergent vs. questionnaires and vs. urodynamic study-UDS) of the 3-day bladder diary (3dBD) in women with lower urinary tract symptoms (LUTS). METHODS: Epidemiological, descriptive, cross-sectional and prospective study. Fourteen Functional Urology and Urodynamic Units participated. One hundred thirty-six women with mean age (SD) 55.2 (13.8) years with LUTS, without bladder catheterization and who were able to fill in the 3dBD were included. An UDS was performed. They filled in the 3dBD in two times separated by 15 days (test and retest), the International Consultation on Incontinence-Short Form (ICIQ-UI SF) and the Bladder Control Self-Assessment Questionnaire (BSAQ). RESULTS: One hundred ten women completed 3dBD for test and retest. Feasibility: each 3dBD has 42 variables, 77.2% women completed 80%. Test-retest reliability: there were not differences in the proportion of patients classified as positive for each symptom (urgency: P = 0.3173; incontinence: P = 1; nocturia: P = 0.0522; frequency: P = 0.4386). The Intraclass Correlation Coefficient (ICC) ranged from 0.67 to 0.92, except for night time VVmax which was lower (0.54). Inter-observer reliability: ICC ranged from 0.64 to 0.99, except for day time VVmax (0.29) and the number of urgency episodes (0.45). VALIDITY: Spearman correlation coefficients for ICIQ-UI SF and BSAQ ranged from 0.4 to 0.6 (P < 0.0001) and for UDS were lower (P < 0.05). CONCLUSIONS: The 3dBD showed good feasibility, reliability and validity to be used in the assessment of LUTS in women.