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Figure 4 Time Course of Ischemia-Induced Changes in Different Components of the ECG

Analysis performed with the MUSE automated system. Prolongation of the QTc interval occurs earlier than the established criteria for acute ischemia (ST-segment elevation [STE], ST-segment depression [STD] 1 mm in 2 contiguous leads). ECG = electrocardiogram; TWC = T-wave change.