Figure 7. Changes in mean arterial blood pressure (BP, closed square) and heart rate (HR, open square) after intrathecal administration of tizanidine 5.0 micro gram (A), clonidine 2.0 micro gram (B), and lidocaine 200 micro gram (C). Data are presented as means +/- SEM. N = 6 for each group. Significantly different from baseline.