Bahadir Ciftci1, Ali Ahiskalioglu2, Mursel Ekinci3, Haci Ahmet Alici4. 1. Istanbul Medipol University School of Medicine, Department of Anesthesiology and Reanimation, Istanbul, Turkey. Electronic address: bciftci@medipol.edu.tr. 2. Ataturk University School of Medicine, Department of Anesthesiology and Reanimation, Erzurum, Turkey; Ataturk University School of Medicine, Clinical Research, Development and Design Application and Research Center, Erzurum, Turkey. 3. Bursa City Hospital Schooll of Medicine, Department of Anesthesiology and Reanimation, Bursa, Turkey. 4. Istanbul Medipol University Faculty of Medicine, Department of Algology, Istanbul, Turkey.