Significance of a fragmented QRS complex in patients with chronic total occlusion of coronary artery without prior myocardial infarction

Fragmented QRS (fQRS) complexes that have numerous RSR′ patterns represent alteration of ventricular depolarization. We evaluated the relationship between fQRS and poor coronary collateral circulation and the diagnostic ability of fQRS for myocardial scar detection in patients with chronic total occlusion (CTO) without a history of myocardial infarction