Exercise-induced U-wave alterations as a marker of well-developed and well-functioning collateral vessels in patients with effort angina
Kunihisa Miwa, MDa,
Keiko Nakagawa, MDa,
Tadakazu Hirai, MDa and
Hiroshi Inoue, MD, FACCa
a Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan

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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.
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Figure 2 A typical ECG with exercise-induced prominent U waves (arrows) during a chest pain attack in a 47-year-old male patient with exertional angina pectoris (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: immediately after exercise.
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