Ambulatory electrocardiogram

Holter monitor heart test

An electrocardiogram monitor measures and records your heart's rate and rhythm for a period of 24 hours to seven days

What is a Holter monitor test?

This safe and painless test is done for various symptoms such as irregular or fast heart rates, palpitations, dizziness and fainting spells.

It can also provide information on the effectiveness of medication and treatments. Your GP or cardiologist can refer you for a test.

Need to know

  • What happens during a Holter monitor test? icon plus

    You'll need to wear a medical device called a Holter monitor continuously for a period of 24 hours, 48 hours or seven days. You'll have three electrodes attached to your chest with small sticky pads and wires . These wires are connected to the monitor, which is about the size of a matchbox and worn around your waist or on a cord that hangs around your neck.

    The monitor captures every single electrical impulse in your heart while it's worn. If you need to have a bath or shower, you simply remove the monitor and pads then replace them after. You'll be asked to complete a diary telling us if you have any symptoms such as palpitations or dizziness.
  • How to prepare icon plus

    You won't need to prepare for this test. Your consultant will explain how the test works and answer any questions you may have. The monitor will be set up for you  at one of our cardiac units, and the cardiac physiologists will talk you through the monitor.
  • After wearing your monitor icon plus

    Your consultant will analyse the results of your recording, explain the results, and let you know any next steps.

Our locations

From complex cardiothoracic surgery to tests and diagnostic procedures, we provide exceptional cardiac care across our network of hospitals, outpatient centres and specialist clinics.

Request a cardiac appointment

We're happy to help you make an appointment with one of our experienced cardiologists. You can contact us by telephone or email.


020 7079 4344
This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.
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