What is the rationale for using HVPC to reduce edema in acute injuries?

• A. It heats tissue to improve circulation
• B. High-voltage, pulsed currents promote lymphatic flow and microcirculatory changes; polarity directed to move fluid and reduce swelling
• C. It excites motor nerves to cause rapid contraction
• D. It blocks pain signals to reduce swelling

Answer: (B)

High-voltage pulsed current reduces edema by creating electrical fields that enhance lymphatic drainage and microcirculation in the injured area. The key is directing the polarity so the flow of interstitial fluid moves away from the site of injury toward the lymphatic system, which helps clear edema fluid and inflammatory byproducts. These short, high-amplitude pulses produce effects on the vasculature and surrounding tissues that promote fluid clearance without relying on heating or on eliciting muscle contractions for circulation.

Heating tissue to improve circulation is a thermotherapy idea and not how HVPC reduces swelling. Exciting motor nerves to cause rapid contraction is more about muscle-driven venous return and is not the primary mechanism behind HVPC’s edema reduction. Blocking pain signals provides analgesia but doesn’t address the fluid buildup itself.