Bladder outlet obstruction index and maximal flow rate during urodynamic study as powerful predictors for the detection of urodynamic obstruction in women

Aims To evaluate whether bladder outlet obstruction index (BOOI), a mathematical index of outlet resistance, in association with maximal flow rate (Qmax) obtained during multichannel urodynamics (UDS) or detrusor pressure at maximal flow rate (PdetQmax) could help the identification of obstruction in women. Methods From January 2004 to February 2005, 401 women were assessed in our urodynamic unit. Of these, 133 were neurologically intact women, referred symptoms suggestive of voiding disorders and had an abnormal non‐intubated uroflussometry (NIF) (BOO group). A normal NIF was defined as a bell‐shaped curve in presence of a Qmax >15 ml/sec and a PVR