[1] Charles Univ Prague, Gen Univ Hosp, Med Fac 1, Dept Anaesthesia & Intens Care, U Nemocnice 2, Prague 12808 2, Czech Republic
[2] Univ Klinikum Giessen, Klin Anasthesiol Operat Intens Med & Schmerzthera, Rudolf Buchheim Str 7, D-35392 Giessen, Germany
[3] Landesklinikum, Abt Anasthesie Notfall & Allg Intens Med, Wiener Neustadt Corvinusring 3-5, A-2700 Wiener Neustadt, Austria
[4] AKH Wien, Abt Kardiol Intens Stat 13H3, Wahringer Gurtel 18-20, A-1090 Vienna, Austria