All these patients were evaluated clinically and echocardiographically with Tissue Velocity Imaging (TVI) to assess the severity and prevalence of myocardial dyssynchrony. Main measures were as follow: septal-to-posterior wall motion delay (SPWMD), inter-ventricular electromechanical delay (IVMD), maximal difference in time to peak myocardial systolic contraction (Ts-Diff), and the standard deviation of TS (Ts-SD) of the 12 LV segments.