Predictive Factors for Female Bladder Outlet Obstruction Defined by Pressure-Flow Study

ABSTRACT

PURPOSE: We investigated pre-urodynamic study parameters of bladder outlet obstruction (BOO) defined by pressure-flow study (PFS) in female patients without anatomical obstruction. MATERIALS AND METHODS: The cohort of this study consisted of 320 women who did not have anatomical BOO in whom urodynamic study was conducted for lower urinary tract symptoms (LUTS). BOO was defined when the PFS maximal flow rate (Qmax) was or =25 cmH2O. The main outcomes were the incidence of BOO and its predictive factors in our cohort. RESULTS: Of the total patients, 39 (12.2%) were diagnosed with BOO in the PFS. Free Qmax and maximal voided volume (MVV) were significant predictors of BOO (p15 ml/sec or MVV is >350 ml, PFS may be not essential. On the contrary, if free Qmax and MVV are below these levels, PFS may be indicated to evaluate the presence of BOO.