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(Color online) (a) Schematic diagram (not in scale) of a four heartbeat excerpt of an ECG in the usual (conventional) time domain. The durations , , and of the three RR intervals are shown. (b) The RR interval time series of (a) read in natural time; the vertical bars are equally spaced, appropriately separated, i.e., by a distance (where denotes the window length, see also Appendix 2 of Ref. 20), but the length of each bar denotes the duration of the corresponding RR interval marked in (a). This differs essentially from the plot of the vs the index . In (c) and (d), we depict (a) and (b), respectively, but under time reversal.
(Color online) Results from the analysis of the RR time series: (a) plot of the quantity vs the time to the VF onset for one SCD, i.e., 30. The quantities and are shown by arrows. (b) For each of the 18 SCDs (each bar corresponds to each individual), we plot the value—in the upper part (i.e., positive axis)—and the value —in the lower part (i.e., negative axis)—vs the time it appears before the VF onset. The shaded part indicates the last before the VF onset. (c) The red curve shows the number of SCD that violates both conditions and as a function of scale . The probability to achieve by chance the relevant number of SCD is drawn by blue bars (right vertical scale).
(Color online) Quantity vs for (a) the NN and (b) the RR time series. The green horizontal line corresponds to the minimum value computed in .
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