What test records the electrical activity of the heart?

What test records the electrical activity of the heart?

• A. Echocardiogram
• B. Magnetic resonance imaging
• C. Electrocardiogram
• D. Holter monitor

Answer: (C)

The test that records the heart’s electrical activity is an electrocardiogram. It uses surface leads placed on the chest and limbs to detect the tiny electrical signals generated with each heartbeat, producing a waveform that shows heart rate, rhythm, and conduction patterns. This is different from imaging tests: an echocardiogram uses ultrasound to visualize heart structure and function, and MRI provides detailed images of anatomy and tissue characteristics. A Holter monitor is a portable device that records the ECG over an extended period (often 24–48 hours) to catch intermittent changes. But the fundamental recording of electrical activity is what an electrocardiogram provides.

The test that records the heart’s electrical activity is an electrocardiogram. It uses surface leads placed on the chest and limbs to detect the tiny electrical signals generated with each heartbeat, producing a waveform that shows heart rate, rhythm, and conduction patterns. This is different from imaging tests: an echocardiogram uses ultrasound to visualize heart structure and function, and MRI provides detailed images of anatomy and tissue characteristics. A Holter monitor is a portable device that records the ECG over an extended period (often 24–48 hours) to catch intermittent changes. But the fundamental recording of electrical activity is what an electrocardiogram provides.