[Studies of the new parameter based on the urinary flow rate curve in benign prostatic hypertrophy].

We studied uroflowmetry in 25 normal adult males and 100 patients with benign prostate hypertrophy (BPH). We planned a new parameter, named average flow rate increase ratio (AFRIR), based on urinary flow rate curve. One hundred patients with BPH were measured presumed circle area ratio (PCAR) based on transrectal ultrasonotomography and performed comparative studies. AFRIR was not related to voided volume of urine (VV). Although AFRIR in 100 patients with BPH was not significantly different from that in 25 normal adults males, AFRIR in 20 patients with BPH, needing surgical operation, was significantly lower than that in 25 males. We considered that AFRIR was useful for deciding on the surgical operation and these levels were below 1.5 ml/sec2. AFRIR was correlated well with maximum flow rate (MFR), average flow rate (AFR), MFR/VV x 100, AFR/VV x 100, PCAR and Area, respectively. PCAR correlated well with MFR/VV x 100 and AFR/VV x 100, respectively. Area correlated well with MFR, MFR/VV x 100, respectively. From these results, it was presumed that AFRIR was reflected clearly to the condition of urine voiding.