Abstract
We studied the accuracy of blood glucose mesurement by artificial pancreas (STG-22 and STG-11A, made by NIKKISOH corporation in Japan). The factors which made the error of measured blood glucose level(BGAP) were investigted in terms of 1)patient condition, 2)blood sampling catheter, 3)connecting tube between the catheter and artificial pancreas, and 4)artif icial pancreas itself. Blood sampling catheter was inserted into superior vena cava(SVC). We also performed experimal study related to 3) and 4). [Results] 1)Factors which increased BGAP were, increased SVC pressure, elevation of position of the sampling tube that made blood dilution ratio at the catheter tip increased, vicinity of the sampling catheter tip and IVH line catheter tip, and electric artifact. 2)Factors which decreased BGAP were, occlusion of the catheter tip by blood clot or by SVC wall, blood clot adherence to the blood glucose measuring electrode, and narrowing of the sampling tube. [conclusion] It is important to understand factors which influence BGAP for effective use of artificial pancreas, which should be excluded immediately.
