Importance of Urodynamic Dysfunctions as Risk Factors for Recurrent Urinary Tract Infections in Patients with Multiple Sclerosis

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Abstract
Objective: To analyze the role of urodynamic dysfunctions as risk factors for recurrent urinary tract infections (rUTIs) in patients with multiple sclerosis (MS). Material and methods: We conducted a prospective cohort study of 170 patients with MS who underwent a urodynamic study due to lower urinary tract symptoms. Patients were followed for one year, and 114 (84 women [74%] and 30 men [26%]; mean age 49 years) completed the study. Clinical variables and urodynamic findings (free uroflowmetry, cystometry, and pressure-flow study results) were recorded. Results indicated rUTIs was present in 37 patients (32%). Statistical analysis was performed using Fisher’s exact test, chi-square test, Student’s t-test, and multivariate regression analysis. Results: In univariate analysis, significant differences were observed between patients with and without rUTIs for the following clinical variables: symptom progression time, MS duration, Expanded Disability Status Scale score, and MS type. Regarding urodynamic findings, significant differences were observed in maximum flow rate (Qmax) (lower in patients with rUTIs), voided volume, bladder voiding efficiency, stress urinary incontinence (SUI) (greater rUTI frequency in affected patients), detrusor pressure at maximum flow, and bladder contractility index score. Multivariate analysis identified the urodynamic factors: low Qmax [Odds Ratio (OR) = 0.90 and SUI (OR = 2.95) as the independent predictors of rUTs. Conclusions: Two urodynamic variables: Qmax and SUI, are independent risk factors for rUTIs in MS patients. These two variables might be associated with Pelvic floor dysfunctions.

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