Electrocardiograph (EKG or ECG) technicians operate equipment that measures, monitors, and graphically traces the electrical activity of the heart. Physicians use the graph (electrocardiogram/EKG/ECG) to diagnose and monitor patients' heart problems. The ECG Technician is responsible for educating patients on all testing procedures, properly positioning patients, electrode application, judging the quality of ECG tracings, attaching various arrhythmia monitor devices, and facilitating stress testing under the supervision of a Cardiologist, APP, or Clinical Exercise ...