Abstract
We recognize that the most famous classification of antiarrhythmic drug is the Sicillian Gambit proposed by the AHA 1991, which was modified to the name J-GAMBIT by the JHA 2002. However, these proposed drug action tables are quite difficult to understand for the non-cardiologist. ECG is essentially the measurement of extracellular voltage and it originates from the voltage difference between the action potentials of subendocardial and subepicardial muscle layers. From that point of view, this article describes the relationship between changes in ECG patterns and antiarrhythmic drug actions.