Home > Health Library > Electrophysiology Study
study, or EP study, is a test to see if there is a problem with your heartbeat (heart rhythm)
and to find out how to fix it.
In this test, the doctor inserts
one or more flexible tubes, called catheters, into a vein, typically
in the groin or neck. Then he or she threads these catheters into the heart. At the tip of
these catheters are electrodes, which are small pieces of metal that conduct
electricity. The electrodes collect information about your heart's electrical
activity. Your doctor can tell what kind of heart rhythm problems you have and
where those problems are.
Sometimes the problem can be fixed at the same time. A procedure called
catheter ablation uses the catheters to destroy
(ablate) small areas of your heart that are causing the problem.
Health Tools help you make wise health decisions or take action to improve your health.
An electrophysiology study is used
Tell your doctor if
Talk to your doctor about any concerns you have about the
need for the test, its risks, how it will be done, or what the results will
show. To help you understand the importance of this test, fill out the
medical test information form(What is a PDF document?).
Tell your doctors all the medicines, vitamins, supplements, and herbal remedies you take. Some of these can increase the risk of bleeding or interact with anesthesia. Your doctor will tell you which medicines to take or stop before your procedure.
If you take blood-thinning medicine, be sure to talk to your doctor. He or she will tell you if you should stop taking this medicine before your procedure. Make sure that you understand exactly what your doctor wants you to do.
Arrange for someone to take you home
after the test. You may not have to stay in the hospital overnight.
Do not eat or drink (except for a small amount of water) for a few
hours before the test. If you are taking any medicines, ask your doctor if you
should take them on the day of the test.
Take off any nail polish. That will make it
easier for doctors and nurses to check the circulation in your fingers and
Be sure to empty your bladder completely just before the
Before the test
will feel a sharp sting when the local anesthetic is injected to numb your skin
at the catheter insertion site.
When the catheter is inserted, you
may feel a brief, sharp pain. The movement of the catheter through your blood
vessel may cause a feeling of pressure, but it is not usually considered
painful. You may feel your heart skip when the catheter touches the walls of
your heart. This is normal.
The temperature in the catheterization
lab is kept cool so that the equipment does not overheat. For many people, the
hardest part of the test is having to lie still for an hour or longer on the
hard table. You may feel some stiffness or cramping.
Don't be afraid to speak up if you're
worried about anything during the test. The doctors, nurses, and technicians
want to know exactly how you're feeling.
especially important to tell the doctor if you have any of these symptoms
during or after the test:
You may have some soreness and bruising at the insertion
site. This should disappear in 2 weeks. It is normal for the site to feel
tender for about a week. But call your doctor if:
An electrophysiology study is considered safe. The risks of this test are small.
The more common complications are not serious. They include bleeding or bruising where the catheters were put in.
Serious complications are rare. But they include extra bleeding after the test, puncture of the heart, and damage to the electrical system
of the heart that requires a pacemaker.
Very serious complications, such as heart attack or stroke, are very rare.
This test is not usually done during pregnancy, because
it involves X-rays. Radiation could damage the developing
Anytime you are exposed to radiation, including the low
levels of X-ray used for this test, there is a chance of damage to cells or
tissue. But the risk of this damage is usually very low compared to the
possible benefits of the test.
An electrophysiology study will show whether you have an
abnormal heartbeat that needs treatment. (Sometimes the treatment is done
during the test.)
Reasons you may not be able to have the test or
why the results may not be helpful include:
An electrophysiology study can be scary. You may find it helpful to
talk to your doctor ahead of time about your fears. If you are awake during the
test, you can ask questions and let your doctor and others know how you're
Visit the American Heart Association (AHA) website for information on
physical activity, diet, and various heart-related conditions. You can search for information on heart disease and stroke, share information with friends and family, and use tools to help you make heart-healthy goals and plans. Contact the AHA to find your
nearest local or state AHA group. The AHA provides brochures and information
about support groups and community programs, including Mended Hearts, a
nationwide organization whose members visit people with heart problems and
provide information and support.
The Heart Rhythm Society provides information for
patients and the public about heart rhythm problems. The website includes a
section that focuses on patient information. This information includes causes,
prevention, tests, treatment, and patient stories about heart rhythm problems.
You can use the Find a Specialist section of the website to search for a heart
rhythm specialist practicing in your area.
The U.S. National Heart, Lung, and Blood Institute
(NHLBI) information center offers information and publications about preventing
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.
Miller JM, Zipes DP (2012). Diagnosis of cardiac arrhythmias. In RO Bonow et al., eds., Braunwald’s Heart Disease: A Textbook of Cardiovascular Medicine, 9th ed., vol. 1, pp. 687–709. Philadelphia: Saunders.
Tedrow UB, et al. (2011). Electrophysiology and catheter-ablative techniques. In V Fuster et al., eds., Hurst's The Heart, 13th ed., vol. 1, pp. 1058–1070. New York: McGraw-Hill.
August 5, 2011
Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology & John M. Miller, MD, FACC - Cardiology, Electrophysiology
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