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Temporal summation of second pain (TSSP) results from repetitive stimulation of peripheral C-fibers (>0.33 Hz) and is thought to reflect summation mechanisms of dorsal horn neurons (ie, windup). Both TSSP and windup result in short term enhancement of C fiber-evoked responses that decay rapidly after the end of stimulation. However, very low stimulus frequencies (0.17 to 0.08 Hz) can maintain this...
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