ADVANCE: Assessment for Defining Variability in Anesthesia Through Novel Clinical EEG

The present study is designed to compare prospectively whether sBIS, sEMG, or CVI variability (brain monitoring) can be used to predict unwanted intraoperative responses (high blood pressure, fast heart rate, tearing, etc.) to stimulation (pain) and to determine whether these intraoperative findings are related to patient-assessed postoperative pain scores. The hypothesis is that increases in these variability measures are associated with increased probability of unwanted responses. If confirmed, these variability measures may help anesthesia providers by highlighting periods of inadequate analgesia (pain relief).