Electrocardiogram

An electrocardiogram records the electrical signals in heart. It's a common and painless test used to quickly detect heart problems and monitor heart's health.

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Electrocardiograms are often done in a doctor's office, a clinic or a hospital room. ECG machines are standard equipment in operating rooms and ambulances. Some personal devices, such as smart watches, offer ECG monitoring.

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Why it's done

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An electrocardiogram is a painless, noninvasive way to help diagnose many common heart problems in people of all ages. Your doctor may use an electrocardiogram to determine or detect:

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• Abnormal heart rhythm (arrhythmias)

• If blocked or narrowed arteries in your heart (coronary artery disease) are causing chest pain or a heart attack

• Whether you have had a previous heart attack

• How well certain heart disease treatments, such as a pacemaker, are working

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You may need an ECG if you have any of the following signs and symptoms:

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• Chest pain

• Dizziness, lightheadedness or confusion

• Heart palpitations

• Rapid pulse

• Shortness of breath

• Weakness, fatigue or a decline in ability to exercise

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If your symptoms tend to come and go, they may not be captured during a standard ECG recording. In this case your doctor may recommend remote or continuous ECG monitoring. There are several different types.

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• Holter monitor. A Holter monitor is a small, wearable device that records a continuous ECG, usually for 24 to 48 hours.

• Event monitor. This portable device is similar to a Holter monitor, but it records only at certain times for a few minutes at a time. You can wear it longer than a Holter monitor, typically 30 days. You generally push a button when you feel symptoms. Some devices automatically record when an abnormal rhythm is detected.

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