Figure 1.

DC flows continuously and, therefore, has no waveform but has distinct positive or negative polarity. DC that flows for sufficiently high current levels for significant periods of time may cause electrochemical injury to the skin and wound tissues. At sufficiently low μA levels, exogenous DC current may be used to mimic the endogenous DC current of injury. DC, direct current. To see this illustration in color, the reader is referred to the web version of this article at www.liebertpub.com/wound