Transurethral microwave thermotherapy for benign prostatic hyperplasia. Subjective response and urodynamic changes.

Results of transurethral microwave thermotherapy for benign prostatic hyperplasia were good after 1 year in 68% of 66 cases. Despite good correlation between subjective assessment of results and improvement in urodynamic parameters, no predictive factors for probably successful outcome could be identified. Diminution in frequency of micturition (diurnal from 8.8 to 6.8 times, nocturnal from 3.0 to 1.6 times), increased flow rates (Q max from 8.8 to 14.2 ml/s) and reduction of detrusor pressures during voiding (Pdet max from 86.9 to 75.0 cm H2O) were significant, but the change in residual volume (from 52 to 37 ml) was of lesser degree (all mean values). Transurethral microwave thermotherapy can be tried for relief of moderate obstruction when transurethral prostatic resection involves risk, or the patient himself requests noninvasive treatment.