A professional who produces recordings of electromotive variations in patient's heart muscle, using electrocardiograph (ECG), to provide data for diagnosis of heart ailments. Responsibilities include:

• Attaches electrodes to chest, arms, and legs of patient.
• Connects electrode leads to electrocardiograph and starts machine.
• Moves electrodes along specified area of chest to produce electrocardiogram that records electromotive variations occurring in different areas of heart muscle.
• Monitors electrocardiogram for abnormal patterns.
• Keys information into machine or marks tracing to indicate positions of chest electrodes.
• Replenishes supply of paper and ink in machine and reports malfunctions.
• Edits and forwards final test results to attending physician for analysis and interpretation.
• May attach electrodes of Holter monitor (electrocardiograph) to patient to record data over extended period of time.