Figure 2.

KO₂-induced hyperalgesia (mechanical and thermal) and paw edema are reduced by vinpocetine. Mechanical hyperalgesia (a), thermal hyperalgesia (b), and paw edema (c) were evaluated 0.5, 1, 3, 5, and 7 h after intraplantar injection of KO₂ (30 μg/paw). Mechanical hyperalgesia is presented as Δ withdrawal threshold (in grams), and thermal hyperalgesia is presented as Δ withdrawal threshold (in seconds), both of which were calculated by subtracting the mean measurements at 0.5, 1, 3, 5, and 7 h after KO₂ stimulus from the baseline mean measurements (before stimulus) (^∗p < 0.05 vs. saline, ^#p < 0.05 vs. vehicle (0 mg/kg) group, ^∗∗p < 0.05 vs 10 mg/kg; two-way repeated measures ANOVA followed by Tukey's posttest; Δ mean ± SEM).