causes of arrhythmias include:
Arrhythmias may be caused by many different factors, including: 1  Coronary artery disease. 2  Electrolyte imbalances in your blood (such as sodium or potassium). 3  Changes in your heart muscle.  Injury from a heart 1  attack. Healing process after heart surgery.  Irregular heart rhythms can also occur in normal, healthy hearts.