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Figure 4 Kaplan-Meier actuarial curves for arrhythmic event-free rates based on positive or negative for T-wave alternans (TWA) (A), late potentials (B), and the combination of the two noninvasive tests (C) following acute myocardial infarction. The combination of TWA positive and LP positive had poorer event-free (p < 0.0001) than the other.