Figure 5. Effects of 2% and 4% isoflurane on the maximum changes in mean arterial pressure (MAP, top), heart rate (HR, middle), and renal sympathetic nerve activity (%RSNA, bottom) in groups 1-3. The maximum changes in MAP in group 1 were not compared with those in groups 2 and 3, because those were largely influenced by the inhalation time. It appears that the maximum decreases in MAP in group 2 were significantly greater than in group 3. HR increased in groups 2 and 3 but decreased in group 2. The maximum increases in %RSNA in group 3 were similar to those in group 1, whereas in group 2, they were less than in groups 1 and 3. *P < 0.05 versus 2% isoflurane. #P < 0.05 versus group 1. &P < 0.05 versus group 2. Values are mean+/-SEM.