Based on these findings, it is expected that insufficient analgesia would likely result in transient increases in BIS due to ongoing surgical stimulation, increasing the overall variability of BIS. Recently reported findings confirm that overall variability of BIS increased prior to and following intraoperative somatic events [10]. These reports also identified similar increases in variability of the EMG, with the largest changes realized from a Composite Variability Index (CVI) which combined the BIS variability (sBIS) and EMG variability (sEMG) into a single value. Other studies have also shown an association between these variability measures and postoperative pain scores [11, 12]. These studies showed that sBIS, sEMG, and CVI computed over the entire surgical procedure were all higher in both adults and children with worse postoperative pain scores. However, the reliability and optimum method of displaying these variability scores has yet to be been determined.