Echocardiographic and CMR measures of dyssynchrony in heart failure. Distribution of dyssynchrony measures obtained from echocardiography and CMR. The standard deviation of the time to peak myocardial sustained systolic velocity (Ts-SD) of 12 left ventricular segments (a) and the CMR-tissue synchronization index CMR-TSI) (b) in controls and in patients with heart failure (HF), stratified according to QRS duration. Note the considerable overlap between healthy controls and patients with heart failure. Adapted with permission from a) Yu C-M et al  and (b) Foley et al.