Using the SEDLine for the Titration of Sevoflurane in Elderly Patients Recovery Using the SEDLine TM for the Titration of Sevoflurane in Elderly Patients Undergoing Non-Cardiac Surgery After Beta-Adrenergic Blockade

Inclusion Criteria: * Patient is male or female. * Patient is 65 years of age or older. * Patient has a physical status between ASA I and III. (Appendix C). * Patient scheduled for general anesthesia for non-cardiac surgery expected to last at least one hour. * Patient able to communicate in English. * Patient has signed an approved informed consent. Exclusion Criteria: * Patient's age is less than 65 years * Anesthetic duration of less than one hour expected * Treatment of beta blockers contra-indicated * Not a candidate for general anesthesia * Patient requires regional anesthesia with general anesthesia. * ASA physical status of IV or V. (Appendix C) * Patient has known drug or alcohol abuse. * Patient has scalp or skull abnormalities such as psoriasis, eczema, angioma, scar tissue, burr holes, cranial implants (such as plates, shunts, etc.). * Patient has experienced a head injury with loss of consciousness within the last year. * Patient has known neurological and psychiatric disorder that interferes with the patient's level of consciousness. * Known concurrent chronic usage of psychoactive or anticonvulsive drugs within the last 90 days, or any use in the last 7 days (i.e. tricyclic antidepressants, MAO inhibitors, lithium, SSRIs, neuroleptics, anxiolytics or antipsychotics). * Patient has any medical condition which, in the judgment of the investigator, renders them inappropriate for participation in this study, such as Guillen Bare syndrome * Known hypersensitivity to the intended anesthetic agents including significant post-operative nausea or vomiting. * Uncontrolled hypertension (unresponsive to medication): Systolic BP \> 180 mmHg or Diastolic BP \> 105 mmHg * Pre-Op baseline heart rate \< 45 beats per minute * Weight 50% greater than ideal body weight * Already monitored for EP or EEG, i.e., Spinal cord cases * Actual anesthetic duration \< 1 hour (assessed after emergence).