title: Negative urodynamic testing in women with stress incontinence.
abstract: BACKGROUND
  A minority of women with a subjective complaint of stress urinary incontinence will have negative urodynamic stress incontinence (USI) findings.
  
  
  OBJECTIVE
  To test clinical and ultrasound measures as predictors of an unexpected absence of USI. We hypothesised that unexpectedly negative USI would be more common in young women with good pelvic floor and urethral function.
  
  
  METHODS
  A retrospective study analysing 398 data sets from women attending a urogynaecology clinic for evaluation of lower urinary tract and pelvic floor dysfunction. Clinical, urodynamic and translabial ultrasound data were tested as possible predictors of negative USI findings.
  
  
  RESULTS
  Women with unexpectedly negative USI findings were younger, had less anterior compartment prolapse and had a higher maximum urethral pressure. Measures of pelvic floor muscle function were not predictive.
  
  
  CONCLUSIONS
  Women with unexpectedly negative USI are younger and have better urethral function, but voluntary pelvic floor muscle function seems unrelated to this phenomenon.
authors.affiliation: Sydney Medical School Nepean, University of Sydney, Nepean Hospital, Penrith, New South Wales, Australia.
authors.forename: Kylie
authors.initials: K
authors.lastname: Liversidge
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Guzmán Rojas
authors.forename: Ixora
authors.initials: I
authors.lastname: Kamisan Atan
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Dietz
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D059411:Lower Urinary Tract Symptoms / Q000000981:diagnostic imaging / Q000503:physiopathology; D008875:Middle Aged; D017773:Pelvic Floor / Q000000981:diagnostic imaging / Q000502:physiology*; D056887:Pelvic Organ Prolapse / Q000503:physiopathology; D012189:Retrospective Studies; D014463:Ultrasonography; D014521:Urethra / Q000502:physiology*; D014550:Urinary Incontinence, Stress / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014563:Urodynamics; D055815:Young Adult
keywords: pelvic floor function; translabial ultrasound; urodynamic stress incontinence; urodynamics