Figure 1
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 and stars represent onset and offset of ventricular tachycardia (VT). Ventricular tachycardia with hypotension resulted in a precipitous fall in PSI and SR, with recovery following termination of VT. 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].