Holter Monitor is an electrocardiogram (EKG) recording that takes place while a patient is participating in their normal daily activities.

Monitoring is usually done for 24 to 48 hours.

Monitoring is often done on an outpatient basis by appointment to identify arrhythmia as the cause of symptoms or unexplained fainting. For their Holter ECG hookup appointment, patient should wear a garment that has a loose neck and opens in the front from neck to waist.