Differential Diagnosis of Q Waves (with Selected Examples) |
Physiologic or positional factors - Normal septal Q waves
- Left pneumothorax or dextrocardia
|
Myocardial injury or infiltration - Acute processes: myocardial infarction, myocarditis, hyperkalemia
- Chronic processes: cardiomyopathy, amyloid, sarcoid, scleroderma, myocardial tumor
|
Ventricular hypertrophy/enlargement - Left ventricular (poor R-wave progression)a
- Right ventricular (reversed R-wave progression)
- Hypertrophic cardiomyopathy
|
Conduction abnormalities - Left bundle branch block
- Wolff-Parkinson-White patterns
|