ES is a relatively frequent complication affecting ICD patients treated for secondary prevention of sudden cardiac death (SCD). Although the acute management of this serious arrhythmia complication is usually successful, occurrence of ES is a strong independent predictor of poor outcome in ICD patients.

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SummaryBmckground: Heart rate variability (HRV) analysis is problematic during maximal treadmill exercise testing (ET) due to rapidly changing heart rate. Hvpothesis:The aim of this study was to aqsess HRV spectral components during treadmill ET in patients with coronary artery disease (CAD) and in healthy controls, and to search for possible differences between the two groups. Kmdts: Both LF and HF were found to decrease gradually during ET and to increase during the recovery period in both patients andcontrols (p<0.001). LFvalues were higherduring the recovery period than during the respective stages of exercise time in both patients and controls, and LF/HF ratio was higher during recovery in patients only.Conclusions: During maximal ET ( 1 ) vagal tone withdraws during the exercise time and increases during the recovery period; (2) the sympathetic activity predominates during the recovery period. especially in patients with CAD and exercise-induced myocardial ischemia. This finding raises the

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