Objective: To compare the flow-mediated dilatation (FMD) among the newly diagnosed impaired glucose tolerance (IGT), type 2 diabetes mellitus (T2DM), and the normal controls (NC) and to analyze relevant factors under different glucose levels.
Methods: The study included IGT (n=34), DM1 (n=52), DM2 (n=33) and NC (n=25). Levels of fasting plasma glucose (FPG), 2-hour postprandial plasma glucose (PPG), fasting insulin (FINS), 2-hour postprandial insulin (PINS), triglyceride (TG), total cholesterol (TC), and hemoglobin A1C (HbA1C) were determined in all participants. High resolution ultrasound examining FMD was performed to measure vascular endothelial function subsequently.
Results: There was statistically significant difference between IGT, DM, HG and NC group in FMD (P=0.008). Partial correlation analysis found that a significant negative correlation existed between FMD and homeostasis model assessment-index (HOMA-IRI), difference of plasma glucose (DPG), FPG and PPG (P<0.01), and a negative correlation between FMD and HbA1C (P<0.05). Setting FMD as dependent variable to conduct multiple linear stepwise regression, in IGT group it was the waist/hip ratio (WHR) and HOMA-IRI that entered the regression equation; in DM1 group it was HOMA-IRI, PPG and DPG that entered the regression equation; in DM2 group it was FPG and HOMA-beta that entered the regression equation.
Conclusion: There exists a flow-mediated vasodilatation dysfunction in patients of newly diagnosed IGT and T2DM. Effect of relevant factors on FMD differs with different glucose levels.
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