Figure 3.

Correlations between pain-related evoked potential (PREP) amplitudes and thermal perception in patients with mixed fiber neuropathy (MFN) and controls. Correlations between PREP peak-to-peak amplitudes (PPA) recorded after electrical stimulation at the feet and quantitative sensory testing (QST) parameters are shown (cold detection threshold, CDT; warm detection threshold, WDT; thermal sensory limen, TSL). PREP peak-to-peak amplitude (PPA) correlated positively with CDT z-scores [r = 0.71, (A)], WDT z-scores [r = 0.63, (B)] and TSL z-scores [r = 0.67, (C)] in MFN patients (A–C). No correlations were found in control subjects (D–F). *p < 0.05