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Figure 4 Intrapericardial nitroglycerin significantly attenuated the magnitude of ischemia-induced T-wave alternans (TWA) in the intracoronary lead at 45 min after delivery (*p < 0.05), in parallel with the agent’s effect on arrhythmias; TWA recovered to pre-drug levels by 75 min after intrapericardial nitroglycerin.