Why the study?
Does Chon's method for selecting the threshold value r in approximate entropy accurately differentiate heart rate variability between heart failure patients and healthy controls?
Does Chon's method for selecting the threshold value r in approximate entropy accurately differentiate heart rate variability between heart failure patients and healthy controls?
Chon's empirical formula for forecasting the r(max) threshold in approximate entropy is not an appropriate tool for analyzing nonlinear signals such as heart rate variability.
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Chon's method should not guide ApEn analysis of HRV; leaves open whether standard parameters differentiate heart failure from controls.
Liu et al. (2010) studied this question.
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