What are the disposable skin-contact devices placed on the patient’s skin to detect ECG signals called?

• A. Wires
• B. Boxes
• C. Leads
• D. Disposable electrical skin contacts

Answer: (D)

The sensors that actually detect the heart’s electrical activity are the electrodes. They are adhesive, disposable patches placed on specific skin locations so the monitor can pick up the tiny electrical potentials produced by each heartbeat. Because they must maintain good contact and hygiene, they’re designed to be disposed of after use. This is why the option describing disposable electrical skin contacts best fits—the phrases “electrodes” and “ECG electrodes” refer to these skin-contact sensing elements.

Wires are just the conductive paths carrying signals from the electrodes, not the sensing elements themselves. Boxes refer to the monitoring unit or display, not the sensing pads. Leads describe the arrangement or set of electrodes plus their connecting wires for a particular viewing angle, not the skin-contact sensors themselves.