During the postoperative @ h , there was marked reduction in morphine requirements in Group B compared to Group C , ( @ @ mg vs. @ @ mg respectively , P = @ ) , lower postoperative pain scores , shorter extubation time ( @ @ min vs. @ @ min , respectively , P = @ ) , better respiratory parameters ( PaO @ / FiO @ , PaCO @ and pH ) , with no incidence of wound infection , no differences in ICU or hospital stay duration .