Differential Diagnosis of Q Waves (with Selected Examples)
Physiologic or positional factors
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Myocardial injury or infiltration
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Ventricular hypertrophy/enlargement
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Conduction abnormalities
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aSmall or absent R waves in the right to midprecordial leads.
Source: Modified from AL Goldberger: Myocardial Infarction: Electrocardiographic Differential Diagnosis, 4th ed. St. Louis, Mosby-Year Book, 1991.