RESULTS	The mean norepinephrine concentration ( pcg/ml ) was greater in the routine care group immediately after surgery ( 480 + / - 70 vs. 330 + / - 30 , P = 0.02 ) and at 60 min ( 530 + / - 50 vs. 340 + / - 30 , P = 0.002 ) and 180 min ( 500 + / - 80 vs. 320 + / - 30 , P = 0.004 ) postoperatively .\