Holter Monitoring


A Holter monitor, also known as ambulatory electrocardiography, is a machine that continuously records the heart’s rhythms.   Holter monitoring determines how the heart responds to normal activity.

The monitor can also be used:

  • When starting a new heart medicine
  • After a heart attack
  • To diagnose heart rhythm problems

It can also be used to diagnose:

  • Atrial fibrillation/flutter
  • Multifocal atrial tachycardia
  • Paroxysmal supraventricular tachycardia
  • Palpitations
  • Reasons for fainting

We may also order a Holter monitor if you have a heart condition that increases your risk of an abnormal heart rhythm, such as hypertrophic cardiomyopathy. We may suggest you wear a Holter monitor for a day, even if you haven’t had any symptoms of an abnormal heartbeat.


The monitor is usually worn for 24 hours during normal activity. A nurse will attach electrodes (small conducting patches) to your chest and connect them to a small recording monitor. You will carry the Holter monitor in a pocket or in a small pouch worn around your neck or waist. The monitor is battery operated.

While you wear the monitor, it records your heart’s electrical activity. You should keep a diary of what activities you perform while wearing the monitor. After 24-hours, return the monitor to your heart our office. Dr. Popper will look at the records and see if there have been any irregular heart rhythms.