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The article describes the data of efficiency of catheter ablation of substrate of ventricular arrhythmias, performed in patients with ischemic heart disease and implanted cardioverter- defibrillator (ICD) in order to decrease the number of ICD therapy. An assessment of the follow-up study of 32 patients was made, the catheter ablations were performed in 10 of them. The statistically reliable number of ICD therapy and at the same time both «shock» and antitachycardia pacing decreased in the group of catheter ablation.