High mean entropy calculated from cardiac MRI texture analysis is associated with antitachycardia pacing failure

Background Antitachycardia pacing (ATP), which may avoid unnecessary implantable cardioverter‐defibrillator (ICD) shocks, does not always terminate ventricular arrhythmias (VAs). Mean entropy calculated using cardiac magnetic resonance texture analysis (CMR‐TA) has been shown to predict appropriate ICD therapy. We examined whether scar heterogeneity, quantified by mean entropy, is associated with ATP failure and explore potential mechanisms...