Direct Recording of Urethral Resistance Using the “Urethroresistance”

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Abstract
Observations on urethral resistance during micturition in non-obstructed men and in patients with bladder outlet obstruction owing to benign prostatic hypertrophy are presented. The urethroresistance, a new instrument, was used for the direct recording of urethral resistance. Upper limit for the minimum urethral resistance during micturition for normal nonobstructed men was 0.5 units. Two patterns of urethral resistance were observed solely in nonobstructed subjects and 3 other patients, which were found solely in patients with a moderate or severe degree of bladder outlet obstruction, apparently were characteristic of bladder outlet obstruction. While direct recording of urethral resistance was a better test for bladder outlet obstruction than the recording of urinary flow rate, the recording of urinary flow was a simple urodynamic test, which remains a useful screening test for bladder outlet obstruction. With the exception of severe obstructive symptoms, none of the other clinical methods for assessment of bladder outlet obstruction, size of the prostate gland, volume of post-micturition residual urine and degree of bladder trabeculation, is reliable to determine the degree of bladder outlet obstruction.