Is abnormal glucose metabolism during pregnancy related to endothelial dysfunction?

Objective: Endothelial dysfunction is an independent risk factor for cardiovascular events. We aimed to investigate the relationship between endothelial dysfunction and gestational diabetes mellitus and impaired glucose tolerance. Methods: Pregnant women who had impaired glucose metabolism in the 75-g oral glucose tolerance test (OGTT) and their age-and body mass index-matched controls were included in the study and assessed for flow-mediated vasodilatation to evaluate endothelial dysfunction. Results: A total of 51 patients participated in the study. There were 20 patients in the control group, 13 in the impaired glucose tolerance group and 18 in the gestational diabetes mellitus group. Flow-mediated vasodilatation measured at the 60th and 120th seconds were significantly lower in the impaired glucose tolerance and gestational diabetes mellitus groups than in the control group (8.5 +/- 5.7 and 8.9 +/- 6.5 versus 14.9 +/- 9.0, p = 0.022 and 6.2 +/- 6.7 and 5.2 +/- 5.0 versus 12.0 +/- 8.3, p = 0.011, respectively). Conclusions: Patients with gestational diabetes mellitus and impaired glucose tolerance have impaired endothelial dysfunction. Delivery might have protective effects on endothelial functions. The significance of impaired endothelial dysfunction for pregnant women must be investigated, and if needed, lifestyle changes might be suggested, according to the determined importance of the endothelial dysfunction.