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Electrophysiology Study
What is it? Overview Usage Side Effects and Warnings

Electrophysiology Study Overview

Written by FoundHealth.


Electrical signals in your heart make the heart muscles contract, which pumps blood to your body. If the electrical signals are not flowing well through the heart, this can create serious problems.

An electrophysiology study is a test where electrode wires are passed through a blood vessel and into your heart. This electrode can record or create electrical activity. This can help find any problems with the flow of electricity in your heart.

The Heart
The Heart
© 2009 Nucleus Medical Media, Inc.

What to Expect

Prior to Procedure

Follow your doctor’s instructions.

Do not drink or eat anything after midnight the night before the procedure.

You doctor may order:

Talk to your doctor about your medicines. You may be asked to stop taking some medicines up to one week before the procedure, like:


A local anesthetic will be given by needle. It will numb the area where the catheter will be inserted. You will also receive a mild sedative through an IV in your arm. This will help you to relax during the test.

Description of the Procedure

You will be asked to lie down on an examination table. Electrodes will be placed on your chest. The electrodes will help to monitor your heart rhythm during the test. An area on your thigh, neck, or just below your collarbone will be cleaned. A thin electrical wire will be inserted into a blood vessel in that area.

The electrode will be passed through the blood vessel and into your heart. Your doctor will be able to see the progress of the catheter with the help of x-rays on a screen. The tip of the electrode can send electrical signals to your heart. The signals will make the heart beat at different speeds. Your heart rhythm will be recorded to look for abnormalities. The tip of the electrode can also record electrical activity at specific spots in your heart muscle.

How Long Will It Take?

The length of the test will vary based on what your doctor is investigating. The test may take 2-4 hours or more to complete.

Will It Hurt?

You may feel some mild discomfort with the initial injection. As the doctors induce an arrhythmia, you may feel palpitations, shortness of breath, chest discomfort, or you may even lose consciousness. The medical team can usually control arrhythmias with medicines, but they may need to administer a shock to stop some rhythms. If they need to do this, you will receive more sedation so that you do not feel pain.

Average Hospital Stay

If your doctor does not need to do additional procedures, you may be able to go home after about six hours. However, you may need to remain in the hospital for up to 24 hours if additional procedures are done during the study.

Post-procedure Care

At the Care Center

  • EKG and blood studies may be done.
  • You will likely need to lie still and flat on your back for a period of time. A pressure dressing may be placed over the area where the catheter was inserted to help prevent bleeding. It is important to follow the nurses' directions.
  • You will need to rest in bed until the sedative has worn off. Your heart rate and blood pressure will be monitored. You will also be checked for swelling or infections. If necessary, you may be given pain medicine. After resting for at least 4-6 hours, your doctor will let you know if you can go home that day or if you need to be admitted for more treatment or observation. If you are discharged on the same day as the test, you should have someone drive you home.

The results of the study may be available before you leave the hospital or in the next few days. Your doctor will notify you if you need any treatment.

At Home

When you return home, do the following to help ensure a smooth recovery:

  • Do not lift heavy objects or engage in strenuous exercise or sexual activity for at least 24 hours.
  • Change the dressing around the insertion area as instructed.
  • Take medicines as instructed.
  • Ice may help decrease discomfort at the insertion site. You may apply the ice for 15-20 minutes each hour, for the first few days.
  • Be sure to follow your doctor's instructions .



American Heart Association

Texas Heart Institute


Heart and Stroke Foundation of Canada

University of Ottawa Heart Institute


HeartCenter Online website. Available at: . Accessed November 22, 2004.

North American Society of Pacing and Electrophysiology website. Available at: . Accessed November 22, 2004.

Texas Heart Institute website. Available at: . Accessed November 22, 2004.



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