Keywords: ACC/AHA Clinical Practice Guidelines; Acute coronary syndrome; Ambulatory ECG monitoring; Antiarrhythmic drug therapy; Arrhythmogenic cardiomyopathy; Athletes; CT imaging; Cardiac electrophysiology; Cardiac resynchronization therapy; Cardiomyopathy; Catheter ablation; Congenital heart disease; ECG; Echocardiography; Electrophysiological testing; Genetic arrhythmias; Guidelines; Heart failure; Imaging; Implantable and external cardioverter devices; Implantable cardioverter-defibrillator; MR imaging; Medication-induced arrhythmias; Myocardial infarction; Premature ventricular beats; Resuscitation; Sarcoidosis; Specific pathology (e.g., congenital heart disease, myocarditis, renal failure); Stable coronary artery disease; Sudden cardiac arrest; Sudden cardiac death; Torsades de pointes; Ventricular fibrillation; Ventricular tachycardia.