Cardiology Specialists of Orange County Saving one Heart at a Time...We don't miss a beat!     Search for: Back to Labs and Tests Holter Monitoring A Holter monitor is an ambulatory ECG that records electrical activity of the heart for 24 consecutive hours.  This testing is extremely helpful in assessing irregular heart activity including atrial fibrillation, tachyrrhtymias and bradyrrhythmias.  Five ECG electrodes are placed on the patient’s chest and the monitor is activated.  The patient performs their usual activities and returns in 24 hours for disconnection.  The technician scans the data and generates a report that is interpreted by a physician.   The examination hook up and disconnect is approximately 15 minutes  All Content © 2005 Cardiology Specialists of Orange County