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Electrocardiogram (ECG)

ecg

What is an electrocardiogram?

An electrocardiogram (ECG) records the electrical activity of the heart. The heart produces tiny electrical impulses which spread through the heart muscle to make the heart contract. These impulses can be detected by the ECG machine. You may have an ECG to help find the cause of symptoms such as palpitations or chest pain. Sometimes it is done as part of routine tests - for example, before you have an operation.

The ECG test is painless and harmless.

How is it done?

Small metal electrodes are stuck on to your arms, legs and chest. Wires from the electrodes are connected to the ECG machine. The machine detects and amplifies the electrical impulses that occur at each heartbeat and records them on to a paper or computer. A few heartbeats are recorded from different sets of electrodes. The test takes about five minutes to do.

What does an electrocardiogram show?

There are normal patterns for each electrode. Various heart disorders produce abnormal patterns. The heart disorders that can be detected include:

  • Abnormal heart rhythms.
  • A heart attack (myocardial infarction), and if it was recent or some time ago.
  • An enlarged heart.

Limitations of the electrocardiogram

A normal ECG does not rule out serious heart disease. For example, you may have an irregular heart rhythm that 'comes and goes', and the recording can be normal between episodes. Specialised ECG recordings sometimes help to overcome some limitations.

Exercise ECG. This is where the tracing is done when you exercise (on a treadmill or exercise bike). This helps to assess the severity of the narrowing of the coronary arteries which causes angina.

Ambulatory ECG. This is where you wear a small monitor which constantly records your heart rhythm. This test records the electrical activity of your heart when you are walking about (ambulatory) and doing your normal activities. It aims to detect abnormal heart rhythms that may 'come and go'. The electrical activity is usually recorded for 24-48 hours


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