Artifactual |
Left-right arm electrode reversal (look for negative P and negative QRS in lead I) |
Normal variant |
Right ventricular overload |
Acute pulmonary embolus or other causes of acute cor pulmonale |
Chronic |
Chronic thromboembolic pulmonary hypertension (CTEPH) syndrome |
Chronic obstructive lung disease |
Any cause of right ventricular hypertrophy |
Lateral wall myocardial infarction |
Dextrocardia, as with situs inversus |
Left posterior fascicular block - must exclude other causes listed above |
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