The purpose of this study is to compare the effects on blood glucose and pH of 5% maltose in lacated Ringer's solution with those of other solutions infused during operation. Ninety patients were divided into three groups according to the type of solutions: 5% maltose in lactated Ringer's solution(M/X Group, N=30), Lactared Ringer's solution(H/S Group, N=30) and 5% dextrose in lactated Ringer's solution (H/D Group, N=30). Blood sampling was done after each solution was infused at the rate of 5cc/kg/hr(N=15) and 10cc/kg/hr(N=15) for and hour. The results were as follows: 1) Blood glucose level following M/X solution infusion was slightly increased in contrast to the significant increase of blood glucose following H/D solution infusion(p<0.005). 2) Blood pH level following M/X solution infusion was not significantly changed regardless of infusion rate, but was significantly decreased following H/D solution infusion at the rate of 10cc/kg/hr(p<0.01).