Which factor does not tend to increase impedances?

Which factor does not tend to increase impedances?

• A. Increased site preparation
• B. Broke/faulty wires
• C. Dirty electrodes
• D. Poor application

Answer: (A)

Impedance at the electrode–skin interface reflects how easily the signal can pass into the amplifier. High impedance degrades signal quality, increases noise, and can produce unstable tracings. Factors that raise impedance include dirty electrodes, broken wires, and poor application, all of which disrupt contact or introduce resistance. In contrast, increased site preparation—cleaning the skin, removing oils, and ensuring good electrode contact—lowers impedance by improving the electrical connection. So, increased site preparation does not tend to increase impedances; it reduces them.

Impedance at the electrode–skin interface reflects how easily the signal can pass into the amplifier. High impedance degrades signal quality, increases noise, and can produce unstable tracings. Factors that raise impedance include dirty electrodes, broken wires, and poor application, all of which disrupt contact or introduce resistance. In contrast, increased site preparation—cleaning the skin, removing oils, and ensuring good electrode contact—lowers impedance by improving the electrical connection. So, increased site preparation does not tend to increase impedances; it reduces them.