Table 1.

Indices of ventricular dyssynchrony obtained by tissue Doppler and strain imaging

Method	Parameter	Cut-off
TVI	Difference between peak systolic velocities of opposite walls [41]	> 65 ms
PW- TDI	Sum of interventricular and intraventricular asynchrony [40]	> 167 ms
TVI	Systolic time-to-peak velocity -SD [42]	> 32.6 ms
TSI	Systolic time-to-peak velocity -SD [46]	> 34.4 ms
Strain Doppler	Time-to-peak of negative strain (systolic or post-systolic) -SD [43]	> 60 ms
Strain Doppler	Sum of times-to-peak of post-systolic shortening [44]	> 760 ms
2D strain	Difference of time-to-peak of radial systolic strain [45]	= 130 ms

SD = standard deviation; PW-TDI = pulsed-wave tissue Doppler; TSI = tissue synchronization imaging; TVI = myocardial velocity curves obtained with color tissue Doppler; 2D Strain = two-dimensional strain (speckle-tracking). Modified from Galderisi M et al [49].