Plasma asymmetric dimethylarginine and coronary and peripheral endothelial dysfunction in hypertensive patients

American Journal of Hypertension
Shin TakiuchiYuhei Kawano

Abstract

The attenuation of coronary flow reserve (CFR) and endothelium-mediated vasodilation of the brachial artery (EMV-BA) have been frequently reported in hypertensive patients. The present study investigated the link between CFR and EMV-BA in hypertensive patients. We hypothesized that changes in serum asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase, and concomitant insulin resistance may be underlying factors connecting the two pathologic alterations. A total of 75 patients (30 men and 45 women, 61.5 +/- 10.1 years of age) with essential hypertension and without coronary artery disease and diabetes mellitus were included in the study. Measurements of CFR were made using adenosine-triphosphate stress transthoracic Doppler echocardiography, and forearm EMV-BA was measured by venous occlusion strain gauge plethysmography. A plasma ADMA assay and a 75-g oral glucose tolerance test were also performed. Average CFR and EMV-BA values were 2.54 +/- 0.63 and 86.0 +/- 54.7%, respectively. A significant correlation was found between CFR and EMV-BA (r = 0.493, P <.001). Both CFR and EMV-BA were also significantly correlated with age and plasma ADMA concentration, but were not correlated with insulin resist...Continue Reading

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