After Institutional Ethics Committee approval and written informed consent, eighty patient-participants (40 per group) aged 20-65 years, ASA physical status I/II, of either sex, and undergoing major laparoscopic / robotic surgery of more than 60-minutes duration will be included in this single-center (Sir Ganga Ram Hospital, New Delhi-110060, India ) prospective, double-blinded, two-arm, randomized controlled study.