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Figure 3 Segments of electrocardiogram tracings with measurements of maximum T-wave alternans magnitude at baseline, during myocardial ischemia, during angerlike state and with simultaneous angerlike state and myocardial ischemia in one dog that experienced ventricular fibrillation at 42 s after provocation of angerlike response was superimposed at 1 min of coronary artery occlusion.