title: Predictive value of low maximum flow rate in benign prostatic hyperplasia.
abstract: Among 84 patients with prostatism selected for transurethral resection of the prostate, 18 had a maximum flow at spontaneous uroflowmetry less than or equal to 7 ml/sec. Preoperatively there was no significant difference between patients with maximum flow less than or equal to 7 ml/sec (Group 1) and patients with maximum flow greater than 7 ml/sec (Group 2) in age, duration of symptoms, symptom scores, bladder volume, residual urine, and detrusor pressure at maximum flow. Patients in Group 1, however, had significantly lower urethral resistance and bladder volume independent maximum flow than patients in Group 2. Postoperatively, patients with preoperative maximum flow less than or equal to 7 ml/sec improved significantly in symptom scores and urodynamic findings apart from bladder volume and detrusor pressure at maximum flow. There were no significant differences between groups in postoperative symptom scores or urodynamic findings. We conclude that preoperative maximum flow rates less than or equal to 7 ml/sec at spontaneous uroflowmetry were related to high urethral resistance and not detrusor decompensation among patients with prostatism, and that patients with maximum flow rates less than or equal to 7 ml/sec fared as well postoperatively as patients with maximum flow greater than 7 ml/sec.
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D011468:Prostatectomy; D011470:Prostatic Hyperplasia / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D014521:Urethra / Q000503:physiopathology; D014554:Urination; D014556:Urine; D014563:Urodynamics