Micturitional static urethral pressure profile: a method of recording urethral pressure profile during voiding and the implications.

Using a tri-lumen graduated 10F catheter we attempted to record static (lateral) pressures at successive points in the urethra, synchronous with intravesical pressure recorded during voiding. Based on our understanding of the essential physical principles described by many earlier investigators we attempted numerous studies in a predominantly male population, which included normal male and female subjects, and male subjects with bladder outlet obstruction of varied etiology. We also attempted to evaluate the effects of the Valsalva maneuver, augmenting the detrusor contraction and artificial distal obstruction (penile compression) on the micturitional static urethral pressure profiles. Studies also were performed to compare the static urethral pressure profiles obtained with the anterograde (catheter withdrawal) and with the retrograde (catheter insertion during voiding) techniques. All of these studies have helped in understanding the various factors, such as double obstructions, artifactual catheter obstructions and incompetent distal sphincter mechanisms, in the interpretation of the micturitional static urethral pressure profile.