Which term refers to the recording of the heart's electrical impulses, sometimes used interchangeably with electrocardiogram?

• A. Cardiac Tracing
• B. Electrocardiography
• C. Electrocardiogram
• D. Angiography

Answer: (C)

The concept being tested is the distinction between the actual trace of the heart’s electrical activity and the procedure used to obtain it. The recording itself—what you see on the paper or monitor that shows the heart’s rhythm and impulses—is called the electrocardiogram. This term refers to the graphical recording produced by the test. The procedure that creates that trace is electrocardiography, the act of recording the heart’s electrical activity. While people sometimes use the terms interchangeably in casual speech, the precise term for the trace is electrocardiogram, making it the best answer here. Angiography is a different test that images blood vessels, not electrical activity, and cardiac tracing is not the standard medical term for the recording.