Varun Suresh1, Saurabh Sharma2, Anurag Aggarwal3. 1. Department of Anaesthesiology, Government Medical College, Thiruvananthapuram, 695011, Kerala, India. varunsureshpgi@gmail.com. 2. Department of Neuro-Anesthesia and Neuro-Critical Care, Kalinga Institute of Medical Sciences, Bhubaneswar, 751024, Odisha, India. 3. Department of Neuroanesthesia and Pain Medicine, Fortis Hospital, Noida, India.