“…The participants were randomly assigned to receive propofol and in control group: thiopental ; thiopental and saline (Anker-Møller et al, 1991); thiopental with halothane ; or, thiopenthal with isoflurane & Jellish et al,1995. In control grup the inhalation anesthetics used were halothane (Hasani et al, 2009), isoflurane (Boccara et al, 1998& Cheng et al,2008, sevoflurane (Ozkose et al,2001, Hofer et al, 2003, Pieters et al, 2010& Shin et al, 2010 and desflurane (Van Hemelrijck et al,1991&Fassoulaki et al, 2010. Also, the control groups contained opioids: fentanyl, remifentanil , Mukherjee et al, 2003& Shin et al, 2010 and alfentanil (Petersen-Felix et al, 1996& Davis et al, 1997.…”