FIGURE 1. Pressure-volume analyses and derived parameters.
(A) and (B) Pressure-volume analysis established by plotting
the intra-vesical volume (Vive) against detrusor pressure (Pdet) of a
voiding. The trajectory of pressure-volume data shapes a loop
representing a voiding cycle; and the left boundary of the loop
indicates the filling stage. (A) The mean compliance (Cm; red)
during the filling stage was calculated by dividing the change in Vive
by that in the Pdet (Cm=ΔVive/ΔPdet). The compliance of the early half
(C1/2, green) and late half (C2/2, blue) of the filling stage were
respectively calculated by dividing the half of ΔVive by the
corresponding ΔPdet as well as dividing the ΔVive between the end and
the half of the filling stage by the corresponding ΔPdet. (B)Post-voided residual volume of a voiding cycle is calculated by the
volume difference between the infused and voided volume.