An electrophysiology (EP) study is a test used to understand and map the electrical activity within your heart.
An EP study may be recommended in people with heart rhythm problems (arrhythmias) and other heart problems to understand the exact cause and determine which treatment is most likely to be effective. Doctors also use EP studies to predict the risk of sudden cardiac death in certain situations.
An EP study involves placing diagnostic catheters within your heart and running specialized tests to map the electrical currents. EP studies are done in the hospital and carry a small risk of serious complications.