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The article presents information on mapping and ablation of ventricular tachycardia (VT). The transseptal approach and coronary cusp approach can be useful for the mapping of specific forms of idiopathic VT originating in the left ventricular outflow tract. Coronary veins can be used to perform epicardial mapping, but the manipulation of the catheter is limited by the anatomical distribution of these vessels. The subxiphoid percutaneous approach to the epicardial space is the only technique currently available that allows an extensive and unrestricted mapping of the epicardial surface of both ventricles.