Heart rhythm tests

Electrophysiology study

An electrophysiology study examines the heart’s electrical system and provides information key to diagnosing and treating arrhythmias. The test or study involves placing special catheters with electrodes within the heart to determine which areas of heart tissue cause heart system disorders. The patient is awake, but sedated for the test, which usually takes about two hours. An electrophysiology study is recommended for patients with conditions such as palpitations, fluttering, slow or rapid heartbeat or fainting.

Event recorder monitoring

A cardiac event monitor records cardiac activity before, during and after a patient experiences symptoms. It is used when symptoms occur infrequently, but at least monthly. When pain or other symptoms begin, the patient starts the monitor by pressing a button. An event monitor is usually used for up to one month.

Holter monitoring

The Holter monitor provides a 24-to 48-hour tape-recording of your heart signals. Every beat – normal or abnormal – is recorded. This test differs from a standard electrocardiogram (ECG) that only tests your heart at rest during a 12-second period. The Holter test evaluates the functioning of your heart throughout a normal day. It can detect intermittent heart disturbances that may not occur in the doctor’s office or hospital setting.

 Holter monitor fact sheet (PDF)

Implantable loop recorder

An implantable loop recorder is a small device that can be implanted under the skin in the chest to help determine the cause of fainting, dizziness, lightheadedness or palpitations. The device continuously records the rhythm of your heart. When you have symptoms, you apply a magnet to the device to mark a recording for your doctor. This can help your doctor determine if your symptoms are caused by an abnormal heart rhythm.