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Holter monitoring—also known as ambulatory electrocardiography (EKG)—is a battery-operated, portable device that measures and records the heart’s electrical activity. The holter monitor is worn during daily activities, including when you sleep. It allows the heart's electrical activity to be recorded longer than an electrocardiography (EKG) test. Holter monitoring can be conducted continuously for 24 to 48 hours. Holter monitoring may be performed to help diagnose abnormal heart rhythms (arrhythmias) or silent myocardial ischemia (a condition where the heart is not receiving enough oxygen-rich blood).