On an electrocardiogram, you see a deepened Q wave that is greater than one-third the height of the QRS complex. This is indicative of:
A. Acute myocardial infarction
B. Acute myocardial ischemia
C. Left ventricular hypertrophy
D. Past myocardial infarction
ANS: D
A pathologic Q wave, indicative of a past myocardial infarction, measures greater than 0.04 seconds and is greater than one-third the height of the QRS complex.
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