During the acute phase, which is a typical use of high-voltage electrical stimulation?

• A. Reduce edema, pain, and muscle spasm
• B. Increase bone density
• C. Significantly raise skin temperature by 10 degrees
• D. Cause histamine release

Answer: (A)

In the acute phase, high-voltage pulsed current is used mainly to reduce swelling, relieve pain, and ease muscle guarding. The brief, high-amplitude pulses create a local electrical field that helps move fluids out of the injured area and supports lymphatic and venous return, which lowers edema. At the same time, stimulation of nerves during these pulses modulates pain signals—often through gate-control effects on large-diameter fibers and possible release of natural analgesics—leading to pain relief. Reducing edema and guarding early on also facilitates range of motion and early rehab.

This modality isn’t intended to heat tissue significantly, increase bone density, or trigger histamine release, which is why those options aren’t appropriate descriptions of its typical acute-use effects.