Electrophysiology studies are helpful to diagnose and evaluate abnormal heart rates and rhythms. This procedure is performed in the cardiac cath lab. During the test, one or more specialized EP catheters is guided into the heart, where it sends small electrical impulses.

How the heart responds to these impulses can reveal what might be causing heart rhythm abnormalities, and how best to treat them. EP studies are often done before treatment procedures such as ablation or placement of devices such as pacemakers or ICDs.

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