title: Urethral resistance measurement: a new method for evaluation of stress urinary incontinence in women.
abstract: The aim of this study was to evaluate a new method to measure urethral resistance among 66 women with urinary incontinence. A stainless steel sphere attached to a guide wire was developed. The sphere is inserted into the bladder and withdrawn through the urethra at a steady rate. Serial measurements with spheres of 5, 6 and 7 mm were performed. The mean urethral resistance as measured by the largest sphere (0.07+/-0.03) was significantly greater than that measured by the medium sphere (0.06+/-0.02, p<0.0001), which was significantly larger than that measured by the smallest sphere (0.04+/-0.01, p<0.0001). There was good correlation of urethral resistance with maximum urethral closure pressure (MUCP) by this technique, but no correlation with Valsalva leak point pressure (VLPP).
authors.affiliation: State University of Campinas (UNICAMP), Rua: Alexander Flemming 101, Mailbox 6081, 13083-970, Campinas, São Paulo, Brazil. vherrmann@hotmail.com
authors.forename: V
authors.initials: V
authors.lastname: Herrmann
authors.forename: L A
authors.initials: LA
authors.lastname: Arya
authors.forename: D L
authors.initials: DL
authors.lastname: Myers
authors.forename: N D
authors.initials: ND
authors.lastname: Jackson
authors.forename: P C
authors.initials: PC
authors.lastname: Palma
authors.forename: C L
authors.initials: CL
authors.lastname: Riccetto
mesh_terms: D000328:Adult; D000368:Aged; D004867:Equipment Design; D005260:Female; D006801:Humans; D008875:Middle Aged; D011312:Pressure; D014521:Urethra / Q000502:physiology*; D014550:Urinary Incontinence, Stress / Q000175:diagnosis*; D014563:Urodynamics; D014636:Valsalva Maneuver