Which of the following is the most characteristic electrocardiographic finding in myocardial in-farction?
a. T wave inversion c. ST segment depres-sion
b. ST segment eleva-tion d. Down-ward-deflected Q waves
ANS: D
When cardiac tissue fed by the left anterior descending and circumflex branches of the left cor-onary artery infarct, Q waves become abnormal most noticeably on the left precordial leads. As a result, the Q waves deflect downward instead of upward because of a lack of counterbalancing electrical forces on the affected side.
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