Anesthesia was induced and maintained with sevoflurane in Group I and TIVA with propofol in Group T. Blood samples were obtained before the induction of anesthesia ( t@ ) , @ min after tourniquet inflation ( t@ ) , immediately before ( t@ ) , and @ min ( t@ ) , @ min ( t@ ) , @ min ( t @ ) , @ h ( t@ ) , @ h ( t@ ) , and @ h ( t@ ) after tourniquet release .