ABC of clinical electrocardiography: Acute myocardial infarction---Part I

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Abstract
Hyperacute T waves The earliest signs of acute myocardial infarction are subtle and include increased T wave amplitude over the affected area. T waves become more prominent, symmetrical, and pointed (“hyperacute”). Hyperacute T waves are most evident in the anterior chest leads and are more readily visible when an old electrocardiogram is available for comparison. These changes in T waves are usually present for only five to 30 minutes after the onset of the infarction and are followed by ST segment changes. Hyperacute T waves

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