What is the level of anaesthesia per CSI unit number?
The CSI scale shows a good correlation with anaesthetic drugs dosage (effect-site concentration of propofol or end-tidal sevoflurane, for example). Nevertheless, it is not possible or advisable to state a specific equivalent drug concentration value for the CSI unit simply because the same drug concentration does not have the same effect on all patients. It depends on features like age, body mass, blood volume considerations, etc. Furthermore, patients undergoing surgery also receive analgesics, muscular relaxants and other drugs, and all of these can influence the anaesthetic depth.
