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Holter monitoring is used to determine how the heart responds to normal activity.
The heart normally contracts regularly due to an orderly spread of electrical activity from an area of specialized heart cells called “pacemaker cells” to the rest of the heart. An electrocardiogram (ECG) represents a surface mapping of the electrical activity of the heart.
There is a normal pattern of changes in the electrical activity of the heart with exercise. Normal variations in electrical activity occur with various activities. With different types of heart disease, there will be various other patterns of changes in the electrical activity of the heart during normal daily activity. The resulting changes in the rate and shape of the surface mapping of the electrical activity during normal daily activity is continuously recorded on the holter monitor.