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Atrioventricular block, including complete heart block
Sinus-node dysfunction, often presenting as sinus bradycardia
Primary T-wave changes, abnormal Q waves, or both
Dysrhythmias
Ventricular premature beats, often multiform
Nonsustained ventricular tachycardia, often polymorphic
Ventricular fibrillation
Atrial fibrillation
Myocardial abnormalities
Increased cardiac weight
Dilated left ventricle, right ventricle, or both
Segmental left ventricular dysfunction
Diffuse left ventricular dysfunction, right ventricular dysfunction, or both
Decreased left ventricular ejection fraction
Diastolic dysfunction
Ventricular aneurysms
Intracardiac thrombus
Pericardial effusion (during the acute phase)
