The calculation and comparison of the Detrusor Contractility Parameter and Watts Factor.

Aims: To test the significance of association between a validated index of detrusor contractility, vCE, the Watts Factor, and the Detrusor Contractility Parameter, t20‐80; and to test whether t20‐80 depends on outflow tract resistance as indicated by Bladder Outlet Obstruction Index (BOOI). Methods: Thirty‐seven pressure‐flow traces from 20 male and 17 female patients were analyzed and forms of the Watts Factor, t20‐80 and BOOI were compared with vCE. Results: The Detrusor Contractility Parameter, t20‐80, is significantly associated with vCE for both women and men without a high degree of bladder outlet obstruction. The Watts Factor only had a significant association with vCE at the point of maximum flow in women. Conclusions: The Detrusor Contractility Parameter (DCP) (t20‐80), can be measured easily from the pressure flow curves of a urodynamic test. The Watts Factor at maximum urine flow, WFQmax, can be readily calculated, but is only applicable to women. In both women and men without a high degree of bladder outlet obstruction, DCP is better associated with true detrusor contractility than any Watts Factor analysis. [ABSTRACT FROM AUTHOR]