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Electrocardiogram (ECG/EKG)
Category: Heart Tests & Procedures · All heart tests & procedures
What it is
An electrocardiogram (ECG) is a recording of the heart's electrical activity through sticky electrodes placed on the chest, arms and legs. It is quick, painless and completely safe.
Why it is done
It is used to check heart rhythm and rate, to look for signs associated with heart attacks, thickened heart muscle, and electrical conduction problems, and as a routine check before surgery or when starting some medicines.
How to prepare
There is no preparation. You will need to uncover your chest, so wear a top that opens or removes easily. Avoid heavy skin creams on the chest that day, as electrodes need good contact.
What happens during the procedure
You lie still on a couch while ten electrodes are attached and the machine records for a few seconds. You will not feel anything. The whole appointment usually takes about 10 minutes.
Afterwards — recovery & results
You can carry on as normal immediately. The trace is reviewed by a clinician or reported by a specialist, and urgent abnormalities are acted on the same day.
Risks & considerations
There are no risks from an ECG itself. Its limitation is that it only records a few seconds, so rhythm problems that come and go may need a longer recording such as a heart monitor worn for days.
Watch: Electrocardiogram (ECG/EKG) videos
Real procedure videos from the MedicalVideos.com library. Some clinical footage is graphic — that is the nature of a medical video library.
Related guides on MedicalVideos.com
Frequently asked questions
Does an ECG hurt?
No. The electrodes only record; nothing is sent into the body. Removing sticky electrodes can tug lightly on the skin.
My ECG was abnormal — does that mean I have heart disease?
Not necessarily. ECGs can show variations that are normal for some people, and findings are always interpreted with your symptoms and history. Your doctor will explain what yours means.
Related procedures — Heart Tests & Procedures
Browse the E section of the A–Z list or return to the Procedures & Tests hub.