Electrophysiology Study |  | 
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An electrophysiology study (EPS) closely monitors your heart rhythm. EPS can help determine exactly what your rhythm problem is and what can be done to control it. A specially trained doctor (electrophysiologist) performs the procedure in an EPS lab.
Before the test
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Tell your doctor which medications you take. Ask if you should stop taking them before the procedure
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Have any routine tests that your doctor recommends
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Don't eat or drink anything after midnight, the night before the procedure
During the test
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The study takes about one to four hours
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After the skin is numbed with a local anesthetic, an incision is made where the catheter will be inserted
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One or more catheters are passed through the veins and positioned in the heart
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The catheters record electrical activity of the heart. They find where and when signals begin and how often they are sent
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Other procedures that may be done during the study include defibrillation (electric shock to the heart to help adjust the heart rhythm) and catheter ablation (destruction of an abnormal electrical pathway or cells in the heart)
After the test
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You'll need to remain lying down for six to 12 hours
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If the insertion site was in your groin, you may be asked not to move your leg for several hours
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A nurse will check the insertion site and your blood pressure
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After the study, you usually remain in the hospital for several hours or overnight
When to call your doctor Call your doctor if:
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The insertion site has pain, increased swelling, redness, bleeding or drainage
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You have shortness of breath or angina (chest pain)
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You have severe pain, coldness, numbness or a bluish color in the leg or arm that held the catheter
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You have a fever over 100.0°F |
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