T Sivashanmugam1, R Sripriya2, S John Paul3, M Ravishankar4. 1. Department of Anaesthesiology, Mahatma Gandhi Medical College and Research Institute, Sri Balaji Vidyapeeth University, Pillaiyarkuppam, Puducherry, India. 2. Department of Anaesthesiology, All India Institute of Medical Sciences, Mangalagiri, Andhra Pradesh, India. 3. Department of Anaesthesiology, Ganga Medical Center, Saibaba Kovil, Coimbatore, India. 4. Mahatma Gandhi Medical College and Research Institute, Sri Balaji Vidyapeeth University, Pillaiyarkuppam, Puducherry, India.