Key Words: Cath Lab Tech, CLT, Cardiac Catheter Lab Technician, Cardiac Catheterization, Cardiovascular Technologist, RCIS, EP Tech, Interventional Tech, Electrophysiology, Electrophysiology Tech, Electrophysiology Technologist, IR Tech. The primary responsibility of the EP Tech is to provide assistance with the patient care in the electrophysiology lab through the provision of technical assistance to the cardiac catheterization and EP team.