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[Endothelial function test].

Endothelial dysfunction is thought to have pivotal roles for the development of hypertension, initiation/progression of hypertensive organ damages, and prognosis. In clinical setting, flow-mediated vasodilatation (FMD) of brachial artery is used as a marker of endothelial function. However, well-trained sonographer is needed to conduct FMD measurement, and therefore, FMD has not been fully standardized (i.e., the reference value of FMD has not been established). Even so, FMD predicts future cardiovascular events. Lifestyle modifications (i.e., smoking cessation, exercise, or weight loss) and antihypertensive medication provide beneficial effects on endothelial function. Thus, FMD have a potential as a useful surrogate marker for the management of hypertension.