Why should charges be balanced in electrotherapy treatments?

• A. Balanced because we do not want to leave charge in our body
• B. Balanced to maximize tissue heating
• C. Balanced to reduce the risk of burns
• D. Balanced because unbalanced charges enhance healing

Answer: (A)

Balancing charges means delivering equal positive and negative charge so no net charge remains in the tissue after each stimulation cycle. This is essential because any leftover charge can drive electrochemical reactions at the electrode–tissue interface, causing pH changes, irritation, tissue damage, or burns. Using charge-balanced waveforms, like biphasic pulses, cancels out the charge and minimizes these risks, allowing safe, effective stimulation. So the idea here is to prevent leaving charge in the body, which is why that choice is the best answer. In practice, you’ll hear that balancing helps reduce burn risk and tissue injury, rather than aiming to heat more or to “enhance healing” by leaving charge behind.