|
x0
|
Effective volumetric load
|
cm
|
cm
|
Initial displacement, effectively equivalent to the E-wave VTI
|
|
c
|
Viscoelastic loss index
|
N·s·m−1
|
g/s
|
Friction-like force which opposes the ventricle returning to its resting state after systole
|
|
k
|
Chamber stiffness
|
N·m−1
|
g/s2
|
Analogous to the spring stiffness constant, and correlated with invasive LV dP/dV
|
|
kx0
|
Maximum driving force
|
N
|
dynes or mN
|
The initial peak driving force of diastole. Proportional to the peak atrioventricular pressure gradient
|
|
1/2kxo2
|
Potential energy
|
J
|
ergs or mJ
|
Stored potential elastic energy to generate rapid recoil during early filling
|
|
cEpeak
|
Peak resistive force
|
N
|
mN
|
The initial peak resistive force of diastole. Resistive (viscoelastic) force at peak flow
|
|
M
|
Load independent index of diastolic filling
|
N/N
|
unitless
|
Unitless ratio of maximum driving force to peak resistive force (kx0/cEpeak)
|
|
c2-4k
|
Damping index β
| |
g2/s2
|
Relative contribution between damping (c) and recoil (k). Negative values reflect underdamped filling, positive values reflect overdamped filling
|
|
KFEI
|
Kinematic filling efficiency index
|
cm/cm
|
unitless
|
Ratio of the VTI of the acquired E-wave contour fit via PDF to the VTI of the PDF model-predicted ideal E-wave contour with no resistance to filling (c = 0)
|
|
Slope intercept B
|
Maximum driving force for cEpeak = 0
|
N
|
mN
|
y-intercept of the equation: kxo = M·cEpeak + B; peak driving force in the setting of no resistance, related to LVEDP
|
