A comparative study of the Abrams-Griffiths nomogram and the linear passive urethral resistance relation to determine bladder outlet obstruction.

PURPOSE

The Abrams-Griffiths and linear passive urethral relationship (PURR) nomograms are commonly used to diagnose bladder outlet obstruction. To the best of our knowledge there are no clinical studies comparing these 2 evaluations to determine if they similarly predict the findings of bladder outlet obstruction.

MATERIALS AND METHODS

From October 1994 through December 1996 multichannel urodynamic studies were performed in 72 men with lower urinary tract symptoms. The data from each urodynamic study were plotted on the Abrams-Griffiths and PURR nomograms.

RESULTS

Using the Abrams-Griffiths nomogram 23 patients (46%) were unobstructed, 15 (21%) were equivocal for obstruction and 24 patients (33%) were obstructed. When the linear PURR nomogram was applied to the pressure-flow data in each group all unobstructed cases were categorized into grade 0 or 1 (no obstruction), equivocal into grade 2 (mild obstruction) and obstructed into grades 3 through 6 (moderate to severe obstruction).

CONCLUSIONS

The Abrams-Griffiths and linear PURR nomograms are helpful and comparable clinical tools to assess lower urinary tract symptoms in men. The linear PURR nomogram not only detects the presence of bladder outlet obstruction but grades its severity, which may be helpful to monitor treatment.