Figure 2
From: Evaluating and monitoring analgesia and sedation in the intensive care unit
The jagged blue line represents display of Patient State Index (PSI) and suppression ratio (SR) is shown by the red line falling below 0, over time. Solid triangles represent stimulation of patient. Accidental mis-programming of propofol infusion rate resulted in a steady decline in PSI and SR over time. Recognition of mis-programmed rate was recognized and corrected, resulting in return of PSI and SR to baseline values. Reproduced with permission from Ramsay M: Role of brain function monitoring in the critical care and perioperative settings. Semin Anesth Periop Med Pain 2005, 24:195–202. [89].