Figure 2. Blood pressure response-Median systolic blood pressure for various time periods for three study of groups of vascular surgery patients given low-dose (0.75 micro gram [center dot] kg^-1[center dot] h^-1) or high-dose (1.5 micro gram [center dot] kg^-1[center dot] h^-1) mivazerol or placebo. For each patient of a group, the median blood pressure for that period was calculated, and then, for the group, the median for all patients was calculated. The asterisks indicate which differences between the high-dose and placebo groups were statistically significant (P < 0.05). The number of patients per group for each study period is presented in Table 2.