Impact of viability and scar tissue on response to cardiac resynchronization therapy in ischaemic heart failure patients

Aims At present, 20–30% of patients do not respond to cardiac resynchronization therapy (CRT). In this study, the relation between the extent of viable myocardium and scar tissue vs. response to CRT was evaluated. In addition, the presence of scar tissue in the left ventricular (LV) lead position was specifically related to response to CRT.