Mohanchandra Mandal1, Dipasri Bhattacharya2, Antonio M Esquinas3. 1. Department of Anesthesiology, Institute of Post Graduate Medical Education & Research, Kolkata, West Bengal, India. drmcmandal@gmail.com. 2. Department of Anesthesiology, Pain Medicine & Critical Care, R. G. Kar Medical College, Kolkata, West Bengal, India. 3. Intensive Care Unit, Hospital Morales Meseguer, Murcia, Spain.