<prompt> Depth of anaesthesia can be best assessed byPulse oximeterEnd tidal Pco2ABG analysisBispectral index  <response>: Monitors used to assess depth of anesthesia: Electroencephalography EEG Bispectral index BIS Entropy Evoked responses EP - Motor EP, sensory EP Auditory, visual, brain stem evoked potential Patient safety index Narcotrend 