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Figure 3 Ischemia-induced T-wave alternans (TWA) in intracoronary electrocardiogram tracings in a representative experiment; TWA was not evident at baseline, before occlusion of the left anterior descending coronary artery (left). Marked TWA (105.26 µV) appeared just before ventricular fibrillation onset during occlusion without drug (middle) but was minimized (42.10 µV) during the occlusion at 45 min after intrapericardial nitroglycerin (4,000 µg bolus) (right).