Symptomatic and urodynamic improvement by oral distigmine bromide in poor voiders after transurethral resection of the prostate

Abstract

Objectives. To study the clinical and urodynamic effects of oral distigmine bromide (distigmine) by using pressure-flow studies in patients who were persistently poor voiders after transurethral resection of the prostate. Methods. The study included 14 poor voiders after transurethral resection of the prostate who were 50 years old or older. Their poor voiding conditions were characterized by a mean International Prostate Symptom Score of 18.9 or a mean quality-of-life index of 4.6 and a mean maximum flow rate of 8.9 mL/s. All patients underwent symptomatic and urodynamic investigations before and after 4 weeks of daily treatment with 15 mg oral distigmine. Results. In the baseline pressure-flow studies, all patients had weak detrusor contractility as demonstrated by Schäfer’s diagram and the maximum Watts factor but did not have bladder outlet obstruction. They had symptomatic improvements after oral distigmine treatment, with the International Prostate Symptom Score reduced to a mean of less than 10 and the quality-of-life index reduced to a mean of less than 3. In the urodynamic investigations, the maximum flow rate improved significantly to a mean of more than 12 mL/s in parallel with a significant increase in the maximum Watts factor. Detrusor contractility according to Schäfer’s diagram also tended to improve after oral distigmine treatment. However, no significant changes were found in any of the parameters of bladder outlet obstruction. Conclusions. Poor voiders after transurethral resection of the prostate who have weak detrusor contractility without bladder outlet obstruction may benefit clinically from treatment with distigmine because of its efficacy in increasing detrusor contractility without enhancing bladder outlet obstruction.