Abstract
In patients with heart failure, sympathetic activity is elevated and this imbalance of autonomic function leads to further progression of heart failure. It has been reported that exercise training attenuate sympathetic tone in patients with heart failure. Heart rate variability (HRV) has been a help to noninvasive evaluation of autonomic nervous function in patients with heart failure. However to determine indexes of HRV, 24 hours ambulatory monitoring is usually required. MemCalc system (Reflex-meijinR, Crosswell), is a noninvasive, real-time analysis system that uses the maximum entropy method for spectral analysis.
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