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Preoperative electrocardiogram findings in a patient presenting with chest pain and exertional dyspnea. A and B: The electrocardiograms (ECGs) are normal in the presence of angina; C: The ECG shows inverted or biphasic T-waves in the absence of angina; D: The ECG at admission in the absence of angina showing sinus tachycardia and T-wave changes.
