Fatma Yıldırım1, Alastair J Glossop2, Antonio M Esquinas3. 1. Intensive Care Unit, Department of Critical Care Medicine, Dışkapı Yıldırım Beyazıt Research and Education Hospital, 06500, Besevler, Ankara, Turkey. ftagassi@hotmail.com. 2. Department of Critical Care and Anaesthesia, Sheffield Teaching Hospitals Foundation Trust, Sheffield, UK. 3. Intensive Care Unit, Hospital Morales Meseguer, Murcia, Spain.