Holter & Event Loop Monitoring What it's for Holter and event loop monitors are used to help detect a heart rhythm problem, such as a heart beat that is too fast, too slow or irregular. Holter monitors are portable devices that track your heart rhythm constantly for several days. The data it records is then analyzed by your doctor. Event loop monitors are also portable, but may be worn for longer periods of time—up to several months. When you have a heart rhythm irregularity, like palpitations, information is sent to your doctor automatically from the device. How it's done Holter monitoring. A technician attaches several electrodes to your chest so your heart’s electrical activity can be monitored. That information is recorded by a small device that is worn on a belt or shoulder strap. At the end of the testing period—typically one to two days—you return the monitor so the data recorded can be analyzed. Event loop monitoring. This device is attached in much the same way as a Holter monitor. When you feel symptoms of a heart problem, such as palpitations, you press a button on the monitor. Information on your heart’s electrical activity is then sent to your doctor for analysis. This device can be removed for bathing. At the end of the testing period—typically one to four weeks—you return the monitor so the recorded data can be analyzed. Transtelephonic monitoring. This technology can be used to monitor people with heart rhythm problems like arrhythmia, as well as patients with pacemakers. A call into our center allows technicians to monitor your heart’s electrical activity in real time. Technology and expertise at URMC The University of Rochester Medical Center offers the very latest technology for monitoring heart rhythm problems remotely. Our Heart Rhythm Department is considered one of the world’s leaders in the treatment of heart rhythm disorders such as arrhythmia, bradycardia (slow heart beat) and tachycardia (fast heart beat). Our researchers in the Heart Research Follow-up Program have created the world's only central repository of all Holter data, so that we can discover new ways to analyze heart rhythms and diagnose cardiac disease. Who to contact If you need more information about Holter or Event Loop Monitoring at URMC Cardiology, contact us at (585) 275-3661. View this topic in our Health Encyclopedia.