ABDOMINAL STRAINING DURING MICTURITION

Second Report: Groups of Micturition Disorders

Abstract

We have studied 15 patients with bladder neck obstruction, 70 patients with benign prostatic hyperplasia and 19 patients with urethral stricture in regard to abdominal straining during micturition.
Patients with micturition disorders showed a tendency to increase in incidence of abdominal straining compared to normal males. There was no significant difference in the incidence of abdominal straining between patients with micturition disorders and normal males in age between 30 and 59 years. There were no significant differences in incidence and types of abdominal straining among three groups of micturition disorders. There were no significant differences in age, voided volume, average flow rate, maximum flow rate, voiding time, residual volume, opening time and maximum detrusor pressure in the three groups except opening pressure (p<0.05) in patients with benign prostatic hyperplasia between the abdominal straining and nonstraining groups. There were no significant differences in parameters which might be related to each type of abdominal straining in the three groups except voided volume (p<0.01), maximum flow rate (p<0.05) and maximum detrusor pressure (p<0.05) in patients with urethral stricutre between the abdominal straining and nonstraining groups.
We considered that abdominal straining might be an individual habit in patients with micturition disorders. We further considered that they had a higher incidence of type 1 of abdominal straining than normal males because they had difficulties in initiating detrusor contraction under full sensation on account of lower urinary tract obstruction and aging. There were no significant differences in indcidence of type 2, 3 and 4 of abdominal straining and maximum straining pressure between them and normal males.