Ambulatory (Holter) electrocardiography (ECG) monitor

The ambulatory (Holter) monitor is a lightweight continuous electrocardiographic (ECG) monitoring system that uses three surface electrodes to continuously record all cardiac electrical activity, typically for 24 to 48 hours. Once the monitoring period is over, the patient returns the device, and all of the acquired data are analyzed (usually by a trained technician) and a summary report is generated for clinician review.