Electrophysiology Studies (EPS)
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How it work?
Electrophysiology uses electrical signals to help doctors find out what kind of arrhythmia you have and what can be done to prevent or control it. Doctors will perform a cardiac catheterization procedure in which a long, thin tube (called a catheter) will be put into an artery in your leg and threaded into your heart. This catheter can be used to send the electrical signals into your heart. Stimulating the heart will cause an arrhythmia, and doctors can record where in the heart it started. In some cases, you might be given a medicine to cause an arrhythmia. Certain medicines can also be given through the catheter to see which ones will stop the arrhythmia.
What to expect?
Do not eat or drink anything after midnight the night before your test. Talk to your doctor about any medicines that you are taking, because he or she may want you to stop taking them before the test. Also, it may be helpful if you bring your medicines with you to the procedure, so that doctors know exactly what you are taking and how much. You will most likely have blood tests, an electrocardiogram, and a chest X ray taken before the procedure.
Once you are in the catheterization laboratory, you will see television monitors, heart monitors, and blood pressure machines. You will be asked to lie down on an examination table. Electrodes will be placed on your chest. These electrodes have wires called leads, which hook up to an electrocardiogram machine. This machine will monitor your heart rhythm during the test.
To prevent infection, you will be shaved and cleansed around the area of your leg where the catheter will be inserted. A needle with a tube connected to it will be put in your arm. This is called an Intravenous line or IV. You will get a mild sedative through the IV to relax you throughout the test. You will be given an anesthetic medicine with a needle to numb the area around where the catheter will be inserted. You may feel mild discomfort. Then, a small incision will be made in the skin. Once doctors see the artery into which the catheter will go, a special needle is used to poke into it. Doctors then put the catheter into the artery in your leg. You should not feel pain during this part of the test.
The catheter is gently threaded through the artery and into your heart. Once in place, doctors will give your heart small electrical impulses to make it beat at different speeds. You will be able to feel your heartbeat changing speeds, and this may cause some mild discomfort. After the doctors have the information they need, the catheter and IV will be removed. Firm pressure will be applied to the site where the catheter was inserted to stop any bleeding. You will also be bandaged.
You will be moved to another room where you will need to rest for a few hours. You may feel a little sleepy until the sedative has worn off. You should try to lie still and not bend your knee too much. Nurses will watch you to see that your heart rate and blood pressure are normal. After this time of rest, you can go home.
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