Group I ( 28 patients ) received an enteral diet supplements with a low physiological dose of arginine ( 5.7 g per day ) , group II ( 28 patients ) received an isocaloric , isonitrogenous enteral formula with a medium dose of arginine ( 12.3 g per day ) and group III ( 28 patients ) received an isocaloric , isonitrogenous enteral formula with a high dose of arginine ( 18.9 g per day ) .