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An arrhythmia, or abnormal heart rhythm, usually means that the heart is beating too fast, too slowly, or irregularly. Few people do not feel discomfort when they notice that their heart is beating faster or irregularly or if they feel their heart pounding in their throat. Arrhythmia is an abnormal heart rhythm. The heart is controlled by a conduction system that transmits electrical impulses. This causes the heart to beat. This system works automatically, so outside of human will. The heart generally works rhythmically throughout life.