180: Prevalence of ventricular tachyarrhythmias clustering in ICD treated patients with ischemic cardiomyopathy

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Ventricular tachyarrhythmias clustering (occurrence of >3 separate episodes of VT/VF within a 24 h period, each separated by>5 min) in ICD population remains a serious problem, associated with adverse prognosis. Our aim was to retrospectively assess the prevalence of VT clustering in primary and secondary SCD prevention pts and in single, dual and triple chamber ICD device. We studied 360 consecutive pts with ischemic cariomyopathy who underwent ICD implantation for primary (20%) and secondary (80%) SCD prevention, over a mean follow-up period of 8 (5 years. Single, dual and triple chamber ICD was implanted in 29%, 61% and 10% respectively of pts. Stored endocardial electrograms were used to determine the causative rhythm disorders provoking ICD activation. VT arrhythmic clustering was recorded in 43pts (12%). Concerning primary and secondary prevention pts, the prevalence was 4% and 14% respectively (p<.001). Concerning Single, Dual and Triple chamber device, the prevalence was 12,5%, 11,9% and 12,1% respectively (p=NS). Clustering of VTachyarrhymias occurs more often in secondary than in primary prevention ICD's pts with coronary artery disease. No differences exist between single, dual or triple chamber device.