Mikhail Y Kirov1
, Vsevolod V Kuzkov1
, Enrique Fernandez-Mondejar2
and Lars J Bjertnaes3 
1Department of Anesthesiology and Intensive Care Medicine, Northern State Medical University, Troitsky prospect 51, Arkhangelsk 163000, Russia
2Intensive Care Unit, Hospital University Virgen de las Nieves, Servicio de Cuidados y Urgencias, Carretera de Jaén s/n 18013 Granada, Spain
3Department of Anesthesiology, Institute of Clinical Medicine, University and University Hospital of Tromsø, N-9038 Tromsø, Norway