Dipasri Bhattacharya1, Antonio M Esquinas2, Mohanchandra Mandal3. 1. Department of Anaesthesiology, Pain Medicine and Critical Care, R. G. Kar Medical College, Kolkata, West Bengal, India. 2. Intensive Care Unit, Hospital Morales Meseguer, Murcia, Spain. 3. Department of Anaesthesiology and Critical Care, Institute of Post Graduate Medical Education and Research/S.S.K.M. Hospital, Kolkata, West Bengal, India. drmcmandal@gmail.com.