Most ventricular tachyarrhythmias are associated with some form of cardiac pathology, however, some forms, particularly right ventricular outflow tract tachycardia and fascicular tachycardia can occur in the normal heart. This places pressure on the electrophysiologist to distinguish benign forms from VTs caused by cardiomyopathy, myocarditis, congenital heart disease etc. The aim of the Clinical Approaches to Tachyarryhthmias series is to update...