Vipin Chandran1, Arunkumar Sekar2, Nitasha Mishra3. 1. Department of Neurosurgery, AlI India Institute of Medical Sciences Bhubaneswar, Bhubaneswar, Odisha,, 751019, India. 2. Department of Neurosurgery, AlI India Institute of Medical Sciences Bhubaneswar, Bhubaneswar, Odisha,, 751019, India. arunkumar3002@hotmail.com. 3. Department of Anaesthesia, AlI India Institute of Medical Sciences Bhubaneswar, Bhubaneswar, Odisha,, 751019, India.