Electrocardiogram (ECG)

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Types of ECG devices

Because a typical ECG tracks your heart’s electrical activity for a very short time, it probably won’t pick up irregularities that only happen once in a while. It’s like when your internet is acting up but seems fine when someone comes to repair it. To capture these erratic issues, your provider can give you:

  • Holter monitor: You wear this device for 24 to 48 hours to get a continuous recording of your heart’s electrical activity for that time frame

  • Event monitor: You wear this device for a week or more and may need to click a button to start recording when you feel symptoms

When would an EKG be used?

Your healthcare provider uses an EKG to:

  • Assess your heart rhythm to see if it’s normal or if you have arrhythmia

  • Diagnose poor blood flow to your heart muscle (ischemia) because of coronary artery disease

  • Diagnose a heart attack

  • Diagnose abnormalities of your heart, such as heart chamber enlargement and abnormal electrical conduction

  • Diagnose heart damage or heart failure

  • Make sure you’re fit for an upcoming surgery

Symptoms you can diagnose with an ECG

Your provider may give you an EKG test because you have:

  • Chest pain

  • Shortness of breath

  • Tiredness

  • Dizziness

  • A flutter or skip in your heartbeat

  • A fast heartbeat

How do I prepare for an ECG test?

Before an ECG, you can eat and drink like you normally would. However, you’ll want to keep the following in mind before you get dressed on the day of your ECG test:

  • Avoid oily or greasy skin creams and lotions the day of the test. They interfere with electrodes making good contact with your skin

  • Avoid full-length hosiery, as electrodes need to be placed directly on your legs

  • Wear a shirt that you can remove easily to place the leads on your chest

Results

Your ECG results may show that you have:

  • A heart rhythm that’s irregular, too fast or too slow

  • A heart attack (past or present)

  • Heart walls that are getting thicker (cardiomyopathy) or stretched out (aneurysm)

  • A problem getting enough blood to your heart

  • Heart failure.