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Figure 2 HRT Calculation

Calculation of the HRT parameters turbulence onset (TO) and turbulence slope (TS). Turbulence onset is the relative change of R-R intervals (red lines) from before to after the VPC. Turbulence slope is the slope of the steepest regression line fitted over the sequences of 5 consecutive sinus rhythm R-R intervals within the 15 R-R intervals after the VPC. The light blue lines are the 11 possible regression lines. The dark blue line is the steepest one used for TS calculation. Abbreviations as in Figure 1.