1. Department of Anaesthesia & Intensive Care, Karolinska Institutet, Danderyds University Hospital, Danderyd, 182 88 Stockholm, Sweden
2. Section for Trauma and Acute Anaesthesiology, Karolinska Institutet, Karolinska University Hospital, Danderyd, 182 88 Stockholm, Sweden
3. Department of Cardiology, Medical University, 50-367 Wroclaw, Poland