year of follow-up to 9.9% and 9.6% in second and third year after implantation respectively. After alteration of detection parameters (filters, detection zone, onset, stability), lead replacement, pacemaker reprogramming amount of inappropriate detection decreased in subsequent follow-up. The overall efficacy of those interventions was 76.3%. Conclusions: 1) The number of inappropriate detection during the first period after implantation of ICD is relatively high, but decrease after

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... s. 2) The main reason of inappropriate detection in this population is sinus tachycardia and atria1 fibrillation. 3) Analysis of intracardiac electrograms from the bolter memory of ICD enables to alter detection parameters correctly and to eliminate the most of inappropriate detections.