Figure 6.

The individual response to propofol was reflected by the different degrees of patient state index (PSI—(a)) and burst suppression ratio (SR—(b)) across the anesthetic phases in six dogs. The data expressed as mean ± SD for phase 0 (awake), phase 1 (induction), phase 2 (2.4 mg/kg/min), phase 3 (1.2 mg/kg/min), phase 4 (0.6 mg/kg/min), phase 5 (extubation), and phase 6 (recovery to sternal). A shape contrast between dog#5 and #6 in PSI and SR was noticed with dog#5 having much more profound CNS depression indicated by a lower PSI and a higher SR during the same phase of propofol anesthesia than dog#6.