 Emergence and extubation times will be noted. Emergence time is defined as time from discontinuation of anaesthetic to time to follow verbal commands and eye opening. Extubation time is defined as time from anesthetic discontinuation to tracheal extubation. Recovery of the patient will be assessed using the modified Aldrete score. Intraoperative and postoperative complications, if any, will be noted. Various complications tachycardia, bradycardia, hypotension, hypertension will be treated with fentanyl, atropine, mephentramine and labetalol. All patients will be shifted to the ICU for supportive care and further management. Cognitive functions would be assessed preoperatively baseline, between 2 to 3 hours postoperative, 24 hours post-operative, three months and six month. Quality of life QOL will be assessed at three month, six month and one year. Cognitive function will be assessed for memory, learning, executive functioning, sustained attention and verbal fluency and QOL by neuro-psychologist as shown in Appendix below. The difference of brain relaxation by two grades between the two study groups will be considered clinically significant and sample size calculated on this basis. 