Some Clinical Conditions in Which the Electrocardiogram Interpretation Can Be Difficult

Source:Tintinelli 7th

May have ST-segment elevation in the absence of acute myocardial infarction
Early repolarization
Left ventricular hypertrophy
Pericarditis
Myocarditis
Left ventricular aneurysm
Hypertropic cardiomyopathy
Hypothermia
Ventricular paced rhythms
Left bundle-branch block
May have ST-segment depressions in the absence of ischemia
Hypokalemia
Digoxin effect
Cor pulmonale and right heart strain
Early repolarization
Left ventricular hypertrophy
Ventricular-paced rhythms
Left bundle-branch block
May have T-wave inversions in the absence of ischemia
Persistent juvenile pattern
Stokes-Adams syncope or seizures
Post-tachycardia T-wave inversion
Postpacemaker T-wave inversion
Intracranial pathology (central nervous system hemorrhage)
Mitral valve prolapse
Pericarditis
Primary or secondary myocardial diseases
Pulmonary embolism or cor pulmonale from other causes
Spontaneous pneumothorax
Myocardial contusion
Left ventricular hypertrophy
Ventricular-paced rhythms
Left bundle-branch block
Right bundle-branch block