• An electrophysiological study (EP study) is a test that assesses the electrical system of your heart and looks for irregular cardiac rhythms.
• In EP study diagnostic catheters are placed within your heart and specialized tests are done to map the electric currents.

Watch this video to see how EP study is done

Watch this video to get a better understanding of EP study 

Reference - Articles. (n.d.). Retrieved from https://www.cedars-sinai.org/health-library/tests-and-procedures/e/electrophysiological-studies.html