2.3. Pressure-volume analysis
Derived from the cystometry, the pressure-volume analysis (PVA) of
voiding cycles was established by plotting Vive against Pdet (Figure 1A
and B)15,16,18. The mean compliance (Cm) during the
filling stage was calculated by dividing the infused volume by the
threshold pressure (i.e., change in Vive/change in Pdet; ΔVive/ΔPdet).
The compliance of the early and the late halves of the filling stage
(C1/2 and C2/2, respectively) were respectively done by dividing the
change in Vive by the corresponding change in Pdet between the staring
and the half as well the half and the end of the filling stage.
Post-voided residual volume of a voiding was calculated by the volume
difference between the infused volume and voided volume (Figure 1B).