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Figure 2 Curves of arrhythmia-free survival in patients selected by a prospectively defined criterion heart rate variability index  20 U. In each case, the p value corresponds to the log-rank statistics of the Kaplan-Meier survival model. Bold line = placebo arm; fine line = amiodarone arm. Arrhythmia = arrhythmia signs on Holter (see the text for details); fast heart rate = baseline short-term heart rate  75 beats/min; low LVEF = left ventricular ejection fraction 30%; MI = myocardial infarction.
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