EP technicians typically work in a cardiac catheterization laboratory or electrophysiology lab, and their job duties may include performing diagnostic tests, such as electrocardiograms (ECGs) and electrophysiology studies (EPS), which involve inserting specialized catheters into the heart to measure electrical activity. They also assist physicians during procedures to correct arrhythmias, such as cardiac ablation, by monitoring patients' vital signs and cardiac rhythms and helping to operate equipment.