Editorial to QRS fragmentation as a potential new marker for subclinical myocardial dysfunction

Narrow QRS duration (1 R′ fragmentation in two contiguous ECG leads) observed in some patients with ischemic heart diseases signifies conduction disturbances and indicates myocardial scar. Furthermore, it has been proposed that the fQRS location (ie anterior or lateral) may be outcomes relevant. fQRS determined by using resting 12‐lead ECG in clinical practice, a very old and conventional morphological ECG pattern, has recently garnered interest in diverse cardiovascular disorders. fQRS has been identified as a marker or an arrhythmic predictor in subjects with coronary artery disease. Furthermore, the authors could not perform subgroup analysis for fQRS locations because of their limited sample size. [...]studies in larger populations are necessary to confirm whether fQRS can be used in clinical practice to detect myocardial dysfunction in individuals without prevalent heart failure or known cardiovascular diseases.