The concept and measurement of bladder work.

The methodology for the calculation of bladder work from pressure volume traces has been described. Bladder work values have been calculated from the urodynamic data of 50 male patients. When bladder work values were related to the micturition time and the volume passed, a highly significant correlation was demonstrated with urethral resistance. Bladder work values may be a useful index in the diagnosis of bladder outflow obstruction.