Korean J Urol.  2001 Nov;42(11):1146-1151.

Cut-off Value for Bladder Outlet Obstruction in Pressure-Flow Study in Female: A Prospective Study

• Kim H
• Lee U
• Lee M
• Choo MS

Abstract

PURPOSE: We attempted to find out the useful urodynamic parameters for diagnosis of bladder outlet obstruction (BOO) in women, prospectively.
MATERIALS AND METHODS
219 patients were available for analysis, of whom 34 were obstructed by clinical definition, 137 with stress urinary incontinence (SUI) and 34 served as a control. To predict obstruction, comparisons were made; receiver operator characteristic (ROC) curve analysis was used to determine the optimum cut-off values for peak flow rate (Qmax), detrusor pressure at maximum flow (PdetQmax) and maximal urethral closing pressure (MUCP).
RESULTS
On the basis of ROC curves between control and BOO groups, using single cut-off value at pressure-flow study, sensitivities and specificities of BOO were 97.1% and 77.9% (Qmax<12ml/s), 85.3% and 86.8% (PdetQmax>30cmH2O), 79.4% and 88.2% (MUCP>80cmH2O). By combined cut-off values, sensitivities and specificities of BOO were 85.3% and 92.6% (Qmax<12ml/s and PdetQmax>30cmH2O), and 73.5% and 94.1% (Qmax<12ml/s, PdetQmax>30cmH2O, and MUCP>80cmH2O).
CONCLUSIONS
Our results show that BOO might be diagnosed by the criteria of Qmax<12ml/s, PdetQmax>30cmH2O, and MUCP>80cmH2O.

Keyword

Urodynamics; Female; Bladder outlet obstruction

MeSH Terms

Diagnosis
Female*
Humans
Prospective Studies*
ROC Curve
Urinary Bladder Neck Obstruction*
Urinary Bladder*
Urinary Incontinence
Urodynamics