In severe cases, this can lead to atrial fibrillation,
supraventricular tachycardia, and premature ventricular contractions.
Cardiac dilation, decreased oxygen supply, and increased oxygen demand secondary to elevated heart rate and ventricular wall stress may predispose to the development of cardiac arrhythmias arising
in either the atria (atrial fibrillation,
supraventricular tachycardia) or
in the ventricles (ventricular premature complexes, ventricular
tachycardia).