Holter Monitor

What is a Holter Monitoring test?

A Holter monitor is a small, portable digital recorder that records your EKG (your heart's electrical activity) for 24 or 48 hours. Holter monitoring provides your physician with continuous EKG recording during your daily activities. It is helpful in diagnosing abnormal heart rhythms.


Your physician may order a Holter monitor to:

  • Detect abnormalities that may not occur during a regular EKG
  • Evaluate symptoms such as dizziness, syncope and palpitations
  • Assess the effectiveness of treatments, such as medications and pacemakers

What can I expect during the procedure?

Electrodes will be placed on your chest after it has been cleaned to remove oils and shaved, if required. Lead wires from the recorder will be attached to the electrodes and a test EKG recorded. The recorder is then placed in a holding pouch with a strap so that you can carry it easily. You will be given a diary to list any symptoms noticed during the test. The recorder is also equipped with an event marker to be pressed when symptoms occur. You will return after 24 or 48 hours to have the monitor removed. The monitor will be connected to a special computer to scan your EKG.

A cardiologist will read the test and create a report for your doctor. The information received from Holter monitoring helps your physician make an accurate diagnosis and plan a treatment best suited for you.

How do I prepare for the test?

There is no special preparation required.