There may be evidence of:
Wolf-Parkinson-White syndrome (in 15% of children, not in adults)
Bundle branch block (mostly in adults)
Heart block (mostly in adults)
Biventricular hypertrophy
Large QRS voltages
Diffuse T wave inversions
Arrhythmias
Noncompaction cardiomyopathy electrocardiogram
Noncompaction cardiomyopathy MRI
Brugada syndrome electrocardiogram
Haff disease electrocardiogram
Hypertrophic cardiomyopathy electrocardiogram
Sick sinus syndrome electrocardiogram
Left ventricular aneurysm electrocardiogram
Dilated cardiomyopathy electrocardiogram