ECG

A Holter monitor is a small, wearable device that records the heart's rhythm. It's used to detect or determine the risk of irregular heartbeats (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. If the irregular heartbeats are infrequent, a longer term monitor called an event recorder may be needed.

A health care provider may recommend a Holter monitor if you have:

• Signs and symptoms of an irregular heart rhythm (arrhythmia)
• Unexplained fainting
• A heart condition that increases the risk of arrhythmias