[The volume of the prostate in benign hyperplasia and evaluation of infravesical obstruction].

In a prospective study group of 22 patients we analyzed the relationship between the volume of benign prostatic hypertrophy (BPH) and infravesical obstruction. We diagnosed obstruction with urodynamic measurement (pressure flow studies) in 16 patients (72.7%). Volume of BPH was investigated by the transrectal ultrasound. We found obstruction in 11 from 14 patients (63.6%) with BPH > or = 30 ml and in 5 from 8 patients (36.4%) with BPH < 30 ml. The diagnostic accuracy of prostatic volume measurement in the diagnosis of infravesical obstruction was only 63.6%. The volume of BPH did not correlate with the infravesical obstruction. (Tab. 3, Fig. 1, Ref. 14.)