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What are electrophysiology studies (EPS) used for?

Electrophysiology (EP) studies help your doctor diagnose and evaluate abnormal heart rates and rhythms. During these studies, one or more specialized EP catheters are guided through an artery into your heart, where it sends small electrical impulses. How your heart responds to these impulses gives your doctor important information about what might be causing your heart rhythm abnormalities -- and how best to treat them. EP studies are often done before placement of devices such as pacemakers or implantable cardioverter-defibrillators (ICDs) or before a treatment procedure called ablation.
Electrophysiology studies (EPS) are used to assess changes in the heart rhythm that are not controlled with medications. EPS are also used to evaluate fainting that may be caused by rhythm changes and evaluate the effect of medications used. An EPS provides much more detailed information about the heart's electrical functioning than can be achieved through an EKG.

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