Ambulatory electrocardiography is essentially a way to monitor a patient that has been experiencing abnormal heart patterns. During the testing, a patient is equipped with a Holter monitor and is then told to go about heir normal day to day activities. The monitor generates a visual record of the heart’s electrical currents and patterns throughout the day. The goal is to document any abnormal activity as well as what the patient was doing during that time. Abnormal rhythms can be caused by random events or by emotion or stress. These tests are taken continuously over a 24-48 hour period or intermittently for weeks or months at a time.