(Circulation. 2001;103:1238.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Structural Alterations in Subcutaneous Small Arteries of Normotensive and Hypertensive Patients With Non–Insulin-Dependent Diabetes Mellitus
From Internal Medicine, Department of Medical and Surgical Sciences (D.R., E.P., D.G., M.L.M., I.S., E.A.R.), and Human Anatomy, Department of Biomedical Sciences and Biotechnology (L.R., R.B.), University of Brescia, and the Diabetologic Unit (U.V., A.C., A.G.), Spedali Civili di Brescia, Italy.
Correspondence and reprint requests to Damiano Rizzoni, MD, Chair of Internal Medicine, Department of Medical and Surgical Sciences, University of Brescia, c/o 2a Medicina, Spedali Civili, 25100 Brescia, Italy. E-mail rizzoni{at}master.cci.unibs.it
Background—It is not presently known whether non–insulin-dependent diabetes mellitus (NIDDM) is associated with the presence of structural alterations in small arteries or whether the combination of hypertension and NIDDM may have an additive effect on endothelial dysfunction. Therefore, we investigated subcutaneous small arteries in 12 normotensive subjects (NT group), 18 patients with essential hypertension (EH group), 13 patients with NIDDM, and 11 patients with NIDDM and EH (NIDDM+EH group).
Methods and Results—Subcutaneous small arteries were evaluated by a micromyographic technique. The internal diameter, the media-to-lumen ratio, remodeling and growth indices, and the collagen-to-elastin ratio were calculated. Concentration-response curves to acetylcholine, bradykinin, the endothelium-independent vasodilator sodium nitroprusside, and endothelin-1 were performed. The media-to-lumen ratio was higher in the EH, NIDDM, and NIDDM+EH groups compared with the NT group. EH patients showed the presence of eutrophic remodeling, whereas NIDDM and NIDDM+EH patients showed 40% to 46% cell growth. The collagen-to-elastin ratio was significantly increased in the EH and NIDDM+EH groups compared with the NT group. The vasodilatation to acetylcholine and bradykinin was similarly reduced in EH, NIDDM, and NIDDM+EH groups compared with the NT group. The contractile responses to endothelin-1 were similarly reduced in EH, NIDDM, and NIDDM+EH patients.
Conclusions—Our data suggest that the effects of NIDDM and EH on small artery morphology are quantitatively similar but qualitatively different and that the presence of hypertension in diabetic patients has little additive effect on small artery morphology and none on endothelial dysfunction.
Key Words: diabetes mellitus • arteries • structure • hypertrophy • remodeling
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