Glitazones and Endothelial Function (GATE)

The purpose of the study is to determine if the addition of rosiglitazone to subjects with fair glucose control on other oral agents improves endothelial function, a surrogate marker of vascular health. It is hypothesized that improving whole body insulin sensitivity with combination therapy including rosiglitazone will restore the vascular actions of insulin and improve endothelium-dependent vasomotion more effectively than placebo in patients with diabetes mellitus.