Abstract
Therapeutic effectiveness of antiarrhythmic agents, defined as the prevention of lethal or potentially lethal arrhythmias, must incorporate considerations of 3 elements:
the forms and/or frequency of chronic ventricular arrhythmias, as well as the characteristics of arrhythmias labeled as ‘potentially lethal’;the clinical settings in which various forms of ventricular arrhythmias occur; andthe validity of end-points used to guide antiarrhythmic therapy.