Electrocardiogram (ECG)

An ECG (electrocardiogram) is a quick test that records the electrical activity of your heart.

Healthcare professional performing a resting electrocardiogram, with a patient lying on an examination bed wearing chest electrodes connected to an ECG machine in a clinic room.

Your doctor may request an ECG if you have:

  • an unusual heart rate or rhythm
  • high blood pressure
  • chest pain, dizziness or breathlessness
  • a diagnosed heart condition
  • an upcoming procedure or surgery.

ECGs can provide information about how your heart is working. They are also used to assess emergency situations, for example when someone is having a heart attack.

An ECG is painless and harmless and has no associated risks.

What happens?

An ECG takes 5 to 10 minutes. It can be performed at your GP surgery, a clinic or in hospital.

Sticky pads (electrodes) are placed on your chest, arms and legs. Sometimes the clinicians may shave patches to attach the sticky pads. These pads are attached by wires to the ECG machine.

Your heart rate and rhythm are measured by the machine and recorded onto paper.

After the test

You may receive a printout of the results on the day. They will also be sent to the doctor who ordered the test.

Key things to remember

Infographic for electrocardiogram (ECG) appointments, showing icons that indicate the ECG test takes about 10 minutes and that no special preparation is needed beforehand.