What pressure should be used when applying ECG electrodes?

• A. Firm, heavy pressure
• B. No pressure at all
• C. Light, consistent pressure
• D. Repeated pressing

Answer: (C)

When applying ECG electrodes, the goal is to achieve solid, low-impedance contact with the skin without squeezing the skin too hard. Light, consistent pressure does that best: it helps the electrode stay firmly in place and maintains a reliable electrical connection throughout the recording.

If you press too hard, you can irritate the skin, cause discomfort, or even move the electrode, which introduces motion artifacts and can alter the impedance you’re trying to control. No pressure would leave air gaps between the electrode and skin, leading to poor conduction and noisy or unreliable readings. Repeated pressing can irritate the skin and create inconsistent contact, making the signal less stable.

In practice, clean and dry the skin, place the electrode on a suitable area, and apply a gentle, steady press for a few seconds to ensure good adhesion and contact. This approach balances comfort with signal quality.