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Figure 3 AP Amplitude Analyses
(A) No AP amplitude alternans in a 66-year-old male control patient with LVEF of 66% testing negative for TWA. AP alternans k-score = –1.1. (B) AP phase II alternans (arrow) (k-score = 6.3; absolute voltage of alternation [Valt] = 72 µV) in a 72-year-old man with ischemic cardiomyopathy and LVEF of 26%. Red/blue lines indicate superimposed odd/even beats. Abbreviations as in Figure 1.
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