Figure 6.

An example of the influence of ventricular ectopic beats. Entropy values and their variance ratios for subject NSR002 (only 137 ventricular ectopic RR segments) before and after the ectopic beat removal: (A1) entropy results and (A2) their variance ratios for the traditional SampEn ($m=2$, $r=0.2$), (B1) entropy results and (B2) their variance ratios for the physical threshold-based SampEn ($m=1$, $r=12\mathrm{ms}$), and (C1) entropy results and (C2) their variance ratios for the physical threshold-based SampEn ($m=2$, $r=12\mathrm{ms}$).