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Relationship between detrusor function and residual urine in men undergoing prostatectomy.
D E Neal1, R A Styles, P H Powell
1Department of Urology, Freeman Hospital, Newcastle upon Tyne.
British Journal of Urology
|December 1, 1987
Summary
Increased residual urine in men undergoing prostatectomy is linked to age, low flow rates, and high resistance. Detrusor muscle function impairment, not weak pressures, correlates with higher residual urine volumes.
Area of Science:
- Urology
- Nephrology
- Physiology
Background:
- Benign prostatic hyperplasia (BPH) is common in aging men.
- Prostatectomy is a common treatment for BPH.
- Residual urine volume can indicate bladder dysfunction.
Purpose of the Study:
- To investigate the relationship between residual urine volume and detrusor function in men undergoing prostatectomy.
- To identify factors associated with increased residual urine post-prostatectomy.
Main Methods:
- Urodynamic investigation was performed on 253 men.
- Analysis included residual urine volume, peak flow rate, urethral resistance, and detrusor pressures.
- Voiding pressures and detrusor function during filling and voiding were assessed.
Main Results:
- Increased residual urine volumes significantly correlated with older age, low peak flow rate, and high urethral resistance.
- High resting detrusor pressure and increased detrusor pressure rise during filling were also associated with higher residual volumes.
- Impaired detrusor emptying ability correlated with increased residual urine, though weak voiding pressures were uncommon.
Conclusions:
- Detrusor decompensation, specifically impaired emptying, contributes to increased residual urine in men post-prostatectomy.
- Findings support theories linking bladder outflow obstruction to elevated residual urine volumes.
- Urodynamic parameters like age, flow rate, resistance, and detrusor function are crucial for understanding residual urine.