Bladder instability in patients with prostatic hypertrophy.

In 29 patients with urinary obstruction due to prostatic enlargement, medium-fill water cystometry was performed before prostatectomy and again 3 months after. A high incidence of detrusor hyperreflexia was observed pre-operatively, but findings were essentially normal 3 months after resection of the prostate. Possible mechanisms to explain these findings are developed. However, it was clear that the cystometric findings were not related to prostatic size.