Abstract
We invented a new parameter of uroflowmetry and decided its normal range. In this study, 153 normal and 60 obstructive urinary flow curves were analysed. Of 153 normal curves, 70 were obtained from 28 young males and 83 from 78 BPH (benign prostatic hyperplasia) patients after operation. 60 obstructive curves were obtained from 55 BPH patients before operation.
Presuming that the lower limit curve of the flow rate nomogram by Shiroky was logarithmic, natural logarithmic values of voided volume (Ln (v. v.)) were plotted against average flow rates (Qmean). Thus we could draw a strainght line between normal group and obstructive one. This line was represented as Y=1.81(X-2.2). Next, seeking the inclination of the line which linked the point of any micturition with (2.2, 0), micturition coefficient was calculated by Qmean/(Ln (v. v.)-2.2). We thought that the normal range of uroflowmetry could be decided by its inclination. The normal range was more than 1.84 and the boundary range was 1.81-1.84.
