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[Effects of rosiglitazone on endothelium-dependent vasodilation in patients with Type 2 diabetes].

OBJECTIVE
To investigate the effects of rosiglitazone on endothelium-dependent vasodilation in patients with Type 2 diabetes.


METHODS
Eighty-three newly diagnosed patients with Type 2 diabetes were divided into metformin group (metformin 750 mg/d), therapeutic alliance group (rosiglitazone 4 mg/d and metformin 750 mg/d), and rosiglitazone group (rosiglitazone 4 mg/d), and 25 normal subjects were as the control group. All patients were treated for 12 weeks. The height, weight, blood pressure, fasting plasma glucose (FPG), fasting serum insulin (FINS), glycosylated hemoglobin (HbA1c), triglyceride (TG), total cholesterol (TC), low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C), and serum nitric oxide (NO) were measured before and after the therapy. The body mass index (BMI) and homeostasis model assessment-insulin resistant index (HOMA-IR) were calculated. The flow-mediated dilatation (FMD) and endothelium independent dilatation (EID) were measured by high-resolution ultrasound.


RESULTS
The BMI, TG, TC, LDL-C, FPG, HBA1c, HOMA-IR were higher (P<0.01), but HDL-C, NO, FMD were lower (P<0.01) in all diabetic groups than those in the control group before the treatment. After the 12-week treatment, TG, FPG, HBA1c, HOMA-IR decreased significantly in all the diabetic groups (P<0.01); FINS decreased, but HDL-C, NO, FMD and EID increased (P<0.01) in therapeutic alliance group and rosiglitazone groups, while HDL-C, FINS, NO, FMD had no change in metformin group compared with those before the treatment.


CONCLUSION
Endothelium-dependent vasodilation function is impaired in patients with Type 2 diabetes. The therapy with rosiglitazone can increase the serum NO level, and improve endothelium-dependent vasodilation,but metformin has no influence on the above-mentioned indexes.