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Abnormal heart rhythms, called arrhythmias, are disturbances in the regular rhythm of the heart. Rhythms can become too fast, too slow or irregular. Problems with the heart rhythm, or electrical functioning of the heart, can produce symptoms of palpitations (pounding in the chest), fatigue, dizziness, fainting, chest pain or shortness of breath. While some arrhythmias are considered harmless, others can be life-threatening and lead to cardiac arrest if they are not diagnosed and treated.