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Figure 1 A typical ECG with exercise-induced negative U waves (arrows) during a chest pain attack in a 62-year-old male patient with exertional angina pectoris and previous anterior non-Q-wave myocardial infarction (group A). The longitudinal line shows the T-wave terminal determined by establishing a QT interval with simultaneously recorded lead V1. Control: before treadmill exercise stress testing; Exercise: soon after exercise.