ECG 58 A 70-year-old man gave a history of several years of chest pain on exertion. These are his ECGs at rest (upper trace) and on exercise (lower trace). What do they show?
ECG 58

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ECG 58 A 70-year-old man gave a history of several years of chest pain on exertion. These are his ECGs at rest (upper trace) and on exercise (lower trace). What do they show?
ECG 58
