Electrocardiogram (ECG)

What it is

A 12-lead electrocardiogram (ECG or EKG) records the electrical signals that make your heart beat. Stickers (electrodes) are placed on your chest and limbs for about a minute while you lie still. The tracing can show rhythm problems, signs of a prior heart attack, thickening of the heart muscle, and other electrical patterns your cardiologist uses to guide care.

Why it is ordered

• Palpitations, skipped beats, chest pain, dizziness, or fainting
• Baseline recording before other cardiac tests or procedures
• Monitoring known heart disease or the effect of medications
• Pre-operative assessment when requested by your surgeon or family doctor

Before your visit

1. 01No preparation is needed
2. 02Wear a top that is easy to remove; avoid heavy lotions on the chest
3. 03Bring a list of medications — some affect the electrical pattern
4. 04Bring your health card and requisition

During the test

1. 01You lie on the exam bed
2. 02Electrodes are placed on the chest, arms, and legs; a small area may be shaved if needed
3. 03Lie still and breathe normally for a short recording
4. 04The tracing is reviewed by a cardiologist

After

1. 01Stickers are removed and you can leave immediately
2. 02Resume normal activity
3. 03Results are sent to your referring physician

Questions we hear often