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Figure 2 Kaplan-Meier survival curves for the patients with the short-term fractal-like scaling exponent ( 1) <0.85 or  0.85 and for the patients with the standard deviation of all N-N intervals (SDNN) <70 ms or >70 ms included in the placebo arm of the TRACE study. Short-term scaling exponent was a better predictor of mortality than standard deviation of all N-N intervals in these postinfarction patients. Modified from "Fractal Analysis of Heart Rate Dynamics as a Predictor of Mortality in Patients With Depressed Left Ventricular Function After Acute Myocardial Infarction." (18) with permission. SDNN = standard deviation of N-N intervals.
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