This resource includes information about ventricular muscle cell action potential, cardiac arrhythmia, cellular mechanism of arrhythmia, classification of antiarrhythmic drugs, mechanism of antiarrhythmic drugs:, acute treatement of VT, classification of SVT, SVT : ECG correlation, antiarrhythmic drug effects in SVT, radiofrequency (RF) catheter ablation of left free wall accessory AV connection, clinical studies, conclusion and appendix.