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Comparison of Uroflowmetry Time Parameters in Pressure-Flow Study Between Men With Bladder Outflow Obstruction and
Juan Pablo Valdevenito1,2, Abdulmalik Alkhamis3, Andrew Gammie3
1Department of Urology, Hospital Clínico Universidad de Chile, Santiago, Chile.
Neurourology and Urodynamics
|July 21, 2026
Summary
Time parameters in uroflowmetry can help differentiate detrusor underactive voiding contraction (DUVC) from bladder outflow obstruction (BOO) in men. Specific ratios like "Time to maximum flow/Voided volume" showed diagnostic accuracy for DUVC versus BOO.
Area of Science:
- Urology
- Urodynamics
- Lower Urinary Tract Symptoms
Background:
- Differentiating detrusor underactive voiding contraction (DUVC) from bladder outflow obstruction (BOO) in men using free uroflowmetry time parameters remains challenging.
- This study focuses on the pathophysiology of voiding, examining time parameters in pressure-flow studies to distinguish between DUVC and BOO.
Purpose of the Study:
- To compare uroflowmetry time parameters between men with DUVC and BOO.
- To assess the relationship between these parameters and post-void residual (PVR) volume.
- To explore the diagnostic accuracy of specific time parameters for differentiating DUVC from BOO.
Main Methods:
- Retrospective cross-sectional study of urodynamics data from men aged ≥40 years with non-neurogenic lower urinary tract symptoms.
- Patients were categorized into pure BOO and pure DUVC groups based on established Bladder Outflow Obstruction Index (BOOI) and Detrusor Contraction Index (DCI) criteria.
- Matched cohorts (n=136 each) were analyzed for differences in pressure-flow study time parameters using statistical tests; ROC analysis determined diagnostic accuracy.
Main Results:
- Significant differences were observed in several uroflowmetry time parameters, including "Time to maximum flow/Voided volume", "Time to maximum flow/Flow time", and "Time to maximum flow/Voiding time".
- Parameters independent of voided volume, such as "Time to maximum flow/Voided volume" (AUC 0.669), "Time to maximum flow/Flow time" (AUC 0.654), and "Time to maximum flow/Voiding time" (AUC 0.627), demonstrated the best diagnostic accuracy for DUVC versus BOO.
- These findings suggest potential for non-invasive differentiation between DUVC and BOO.
Conclusions:
- Specific uroflowmetry time parameters, particularly ratios involving "Time to maximum flow", show significant differences between men with DUVC and BOO.
- The diagnostic accuracy of these parameters supports their potential utility in differentiating between these conditions.
- Further research is warranted to validate these findings for non-invasive clinical application in diagnosing DUVC and BOO.
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