Holter monitor

A Holter monitor is a small, wearable device that records the heart's rhythm, usually for 1 to 2 days. It's used to spot irregular heartbeats, also called arrhythmias. A Holter monitor test may be done if a traditional electrocardiogram (ECG or EKG) doesn't provide enough details about the heart's condition.

You may need to use a Holter monitor if you have: Symptoms of an irregular heartbeat, also called arrhythmia. Fainting with no known cause. A heart condition that increases the risk of irregular heartbeats. Before you get a Holter monitor, you'll have an electrocardiogram (ECG or EKG). An ECG is a quick and painless test. It uses sensors, called electrodes, taped to the chest to check the heart's rhythm. A Holter monitor may be able to find irregular heartbeats that an ECG missed. If standard Holter monitoring doesn't find an irregular heartbeat, you may need to wear a device called an event monitor. The device records heartbeats over several weeks.

There are no significant risks involved in wearing a Holter monitor. Some people have minor discomfort or skin irritation where the sensors were placed. Holter monitors aren't usually affected by other electrical appliances. But some devices may interrupt the signal from the electrodes to the Holter monitor. If you have a Holter monitor, avoid the following: Electric blankets. Electric razors and toothbrushes. Magnets. Metal detectors. Microwave ovens. Also, keep cellphones and portable music players at least 6 inches from the Holter monitor for the same reason.

You are set up with a Holter monitor during a scheduled appointment at a medical office or clinic. Unless you're told differently, plan to bathe before this appointment. Most monitors can't be removed and must be kept dry once monitoring begins. Sticky patches with sensors, called electrodes, are placed on your chest. These sensors detect the heartbeat. They're about the size of a silver dollar. If you have hair on your chest, some of it may be shaved to make sure the electrodes stick. Wires attached to the electrodes connect to the Holter monitor recording device. The device is about the size of a deck of cards. Once your Holter monitor is fitted and you've received instructions on how to wear it, you can return to everyday activities.