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What is Event Monitoring?

Man's chest showing the heart. Electrodes are positioned on the skin and connected to a Holter monitor on the waistband of his pants.

Event monitoring is a painless way to record your heartbeat away from your doctor’s office. It is a small, battery-operated electrocardiogram (ECG) that you carry with you. Event monitoring records your heartbeat for your doctor to review at a later time. The event monitor lets you record your irregular heartbeat or other symptoms as you feel them. Some event monitors have technology that detect and record irregular heart rhythms, regardless of symptoms. Wireless monitors allow data to be sent immediately to your doctor's office after an event is recorded. You may carry this monitor for days or weeks. You can receive your heart monitor in a hospital, test center, or doctor’s office.

When using an event monitor

Stay away from electric blankets, magnets, metal detectors, and high-voltage areas such as power lines. They may affect the recording.

Your event monitor

After your doctor shows you how to use your event monitor, wear it as instructed all the time. When you feel a symptom, activate the monitor by pressing the designated button. Be sure to keep a diary and record symptoms in detail, including the time and date. Depending on the type of monitor, you may need to change the batteries every one to two days.

An ECG recording of an irregular heartbeat during an event.

An ECG recording of a regular heartbeat.


Event monitor diary

  • Write in the time of day for each entry you make.

  • Note each change in activity, including when you take medicine.

  • Note any symptoms you feel.

Event Monitor Diary


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