If you’ve ever experienced unexplained dizziness, tiredness, or irregular heartbeats, your doctor may recommend a 24-hour Holter monitor test . While the name might sound technical, the concept is simple. This test helps your cardiologist understand what’s going on with your heart when you're away from the hospital and going about your day. Learning about how this device functions and what it shows you can assist in alleviating your concerns and make you better prepared for the experience. What Is a Holter Monitor? A Holter monitor is a small, portable, wearable machine that records your heart's electrical activity over a period of time—typically 24 to 48 hours. It is different from the usual ECG performed in the clinic that takes only seconds. The Holter monitor keeps recording your heart's rhythm round the clock while you carry out your daily activities. Doctors employ it to identify abnormalities that aren't always visible on short ECGs. These may include o...
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