An electrophysiology test (EP) is used to study the heart's electrical system. The test involves inserting a catheter – a narrow, flexible tube – into a blood vessel through the groin or the arm. The catheter is then moved into the heart where it will take a detailed recording of the heart’s electrical activity.

What does it tell the doctor?
This test enables the doctor to determine if you have any abnormalities in your heart's electrical system that can cause irregular heartbeat (arrhythmia). It also allows the doctor to stimulate (increase or slow down) your heart to determine what type of problem you have. The doctor can then decide the best treatment for you.

What happens before the test?

• Get a good night's sleep the night before your test.
• Take medicines as instructed by your doctor with small sips of water.
• If you are a diabetic, talk to your doctor before the procedure because your medication may need to be adjusted.
• If you have a dye or shellfish allergy, inform your doctor and the lab staff. Special precautions will be taken to prevent you from having a reaction.
• Do not eat or drink after midnight the night before your test.

What will I experience?
This test is done in the electrophysiology (EP) lab. During the test, your heart rhythm and blood pressure are monitored continuously. The doctor numbs the area where he inserts a small tube (about the size of a coffee stirrer). Catheters (a wire-like device) are placed through these tubes and moved into your heart.

Next, the doctor will pace (stimulate) your heart to get measurements of your heart's electrical system. You may feel this stimulation. When felt, it is usually described as the heart speeding up and slowing down. If you have any discomfort during the test, please tell the staff. After the test is done, the tubes are removed and pressure is held at the incision for about five minutes or until the bleeding stops. You will then be taken to the recovery area to be monitored for a few hours.