This is a multi-center, prospective, observational, non-invasive, randomized controlled study to collect data to compare the performance of standard practice (SP) group with the BIS™ monitoring (BIS) group. Pediatric patients between the ages of 4 to 18 years undergoing routine sevoflurane general anesthesia with an expected surgical procedure duration of greater than 30 minutes will be recruited. If the surgery is less than 15 minutes, the data will continue to be collected, but will not be included in the data analysis and the subject will be replaced with an additional subject. General surgeries including abdominal, urological, orthopedic, or ophthalmological procedures with an American Society of Anesthesiologists physical status of I - III.
