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J Urol. 1998 Jan;159(1):191-4.

Morbidity of the evaluation of the lower urinary tract with transurethral multichannel pressure-flow studies.

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Department of Urology, University of Vienna, Austria.



The aim of this prospective study was to determine morbidity and complication rate of invasive urodynamic evaluation of the lower urinary tract after transurethral multichannel pressure-flow studies.


The study included 63 men with the clinical diagnosis of benign prostatic hyperplasia and 56 women with stress urinary incontinence. All patients underwent routine pressure-flow study as part of the urodynamic evaluation. A week later the patients returned for followup which also included a detailed interview on post-evaluation morbidity.


The overall complication rate, including urinary retention, gross hematuria, urinary tract infection and fever, was 19.0% (12 of 63) for men and 1.8% (1 of 56) for women. In men there was no statistically significant correlation between post-void residual urine or age and complication rate (p > 0.05). Of the men 4.8% experienced post-investigational urinary retention and all of them had significant bladder outflow obstruction. In addition, obstructed men reported a higher incidence of dysuria and pain (76.2%, 32 of 42) compared to those without obstruction (57.1%, 12 of 21), whereas only 53.6% of women reported these complaints. Of the 63 men 4 (6.2%) had significant urinary tract infections, while only 1 woman (1.8%) had infections.


Invasive urodynamic investigation is associated with a considerable rate of complications and morbidity, particularly in men with infravesical obstruction. These facts must be considered and discussed with the patient before urodynamic testing.

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