What substance should not be used on ECG leads; which should be used instead?

What substance should not be used on ECG leads; which should be used instead?

• A. Alcohol
• B. Saline
• C. Water
• D. Ultrasound Gel

Answer: (A)

The key idea is getting stable, low-impedance contact between the skin and the ECG electrode. Alcohol dries the skin and evaporates quickly, which raises impedance and can lead to poor electrode contact or intermittent tracing. Because of that, it shouldn’t be used at the electrode interface. Instead, a conductive medium like sterile saline or an ECG conductive gel should be used to moisten the skin/electrode and improve electrical conduction, giving a clearer, more reliable ECG signal. Water is not ideal for the same reason of inconsistent conductivity, while ultrasound gel can serve as an alternative conductive medium in many setups.

The key idea is getting stable, low-impedance contact between the skin and the ECG electrode. Alcohol dries the skin and evaporates quickly, which raises impedance and can lead to poor electrode contact or intermittent tracing. Because of that, it shouldn’t be used at the electrode interface. Instead, a conductive medium like sterile saline or an ECG conductive gel should be used to moisten the skin/electrode and improve electrical conduction, giving a clearer, more reliable ECG signal. Water is not ideal for the same reason of inconsistent conductivity, while ultrasound gel can serve as an alternative conductive medium in many setups.