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Figure 3 Risk Dichotomization

The risk of the primary outcome of cardiac death or resuscitated cardiac arrest (A) and secondary outcomes of fatal or nonfatal cardiac arrest (B) and all-cause mortality (C) among patients with impaired autonomic tone, measured using either baroreflex sensitivity or heart rate turbulence, plus abnormal repolarization alternans and an ejection fraction below 0.50 versus the remaining patients are shown. Numbers of patients in each group at the time points are indicated below each graph. TWA = T-wave alternans; other abbreviations as in Figure 2.