Brain Insulin Resistance in Mild Cognitive Impairment

"Hyperinsulinemic, euglycemic clamp technique will be used to promote tissue glucose uptake and measure insulin sensitivity. Two cannulas will be inserted, one in a radial or an antecubital vein for PET tracer injection and infusion of glucose and insulin, another in the opposite radial or antecubital vein for blood sampling. In the clamp study subjects are administered intravenous insulin at a steady rate of 40 mU/m2/min and normoglycemia is maintained using a variable rate infusion of 20% glucose based on plasma glucose measurements, which are performed every 5min from arterialized venous blood. We will also collect samples to determine plasma insulin, serum free fatty acid and metabolic biomarkers during the study.~The clamp will be performed together with \[18F\]-FDG-PET/CT."