ambulatory electrocardiography

Ambulatory electrocardiography, also called ambulatory ECG, ambulatory EKG, or a Holter monitor, is a battery-operated, portable device that measures and tape-records the heart's electrical activity (ECG) continuously, usually for a period of 24 to 48 hours so that any irregular heart activity can be correlated with a person's activity. The device uses electrodes or small conducting patches placed on the chest and attached to a small recording monitor that is carried in a pocket or in a small pouch worn around the neck.