A 40 year old female underwent surgery. Postoperatively she told the anesthetist that she was aware of preoperative events. Individual intraoperative awareness is evaluated by:: (A) Cerebral pulse oximetry, (B) Colour Doppler, (C) Bispectral imaging, (D) End tidal CO2
Answer is C. C i.e. Bispectral imaging Intraoperative awareness and depth of anaesthesia can be evaluated by BIS (bispectral index)Q