Evaluation of Aa point and cotton-tipped swab test as predictors of urodynamic stress incontinence.
OBJECTIVE
To compare the predictive abilities of the Aa point of the pelvic organ prolapse quantification examination and the cotton-tipped swab test straining angle to diagnose urodynamic stress incontinence.


METHODS
A case-control study was conducted between June 1997 and February 2003. Cases were defined as patients with urodynamic stress incontinence (n = 352). Controls were patients who also underwent urodynamic testing but who did not have a diagnosis of urodynamic stress incontinence (n = 245). Independent variables were defined as Aa point, Aa point of 0 or greater, straining cotton-tipped swab angle, and straining cotton-tipped swab angle of 30 degrees or greater. Logistic regression estimated the odds ratio of stress incontinence in women based on Aa values and cotton-tipped swab straining angle measurements, controlling for other variables commonly associated with stress incontinence.


RESULTS
The mean (+/- standard deviation) age of the cases was 55.9 +/- 13.4 and of controls was 55.3 +/- 14.8, (P = .6). The median parity of the cases was 2 (range 0-10) and of controls, 2 (range 0-9) (P = .7). The Aa point was not associated with a diagnosis of stress incontinence (odds ratio 1.01, 95% confidence interval (CI) 0.83-1.23). The adjusted odds ratios of having an Aa value of 0 or greater was 0.49 (95% CI 0.26-0.92), and of having a cotton-tipped swab angle of 30 degrees or greater was 3.1 (95% CI 1.09-5.07), in a model that adjusted for age, parity, race, and postmenopausal and hormonal replacement status.


CONCLUSIONS
Aa point is not associated with a diagnosis of stress incontinence. However, a cotton-tipped swab angle of 30 degrees or greater is positively associated with stress incontinence.
Tapp
Karen
K
Division of Urogynecology/Reconstructive Pelvic Surgery, Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7570, USA.
Connolly
Annamarie
A
Visco
Anthony G
AG
D016022:Case-Control Studies; D003950:Diagnostic Techniques, Urological; D005260:Female; D006801:Humans; D008875:Middle Aged; D014521:Urethra / Q000503:physiopathology; D014550:Urinary Incontinence, Stress / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D014563:Urodynamics; D014596:Uterine Prolapse / Q000150:complications / Q000175:diagnosis