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  • 1
    Electronic Resource
    Electronic Resource
    Impaired endothelium-dependent and independent vasodilation in patients with Type 2 (non-insulin-dependent) diabetes mellitus (1992)
    Springer
    Diabetologia 35 (1992), S. 771-776 
    Details
    ISSN: 1432-0428
    Keywords: Acetylcholine ; NG monomethyl-l-arginine ; endothelium derived relaxing factor ; glyceryl trinitrate ; venous occlusion plethysmography ; Type 2 (non-insulin-dependent) diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The endothelium plays a pivotal role in modulating the reactivity of vascular smooth muscle through the formation of several vasoactive substances. We examined the effects of endothelium-dependent and independent vasodilators on forearm blood flow in 29 patients with Type 2 (non-insulin-dependent) diabetes mellitus and in 21 control subjects, using venous occlusion plethysmography. Via a brachial artery cannula, increasing amounts of acetylcholine and glyceryl trinitrate were infused in doses of 60, 120, 180 and 240 mmol per min and 3, 6 and 9 nmol per min respectively. NG monomethyl-l-arginine, a stereospecific inhibitor of endothelium derived relaxing factor, was infused to inhibit basal and stimulated release of this dilator substance. Reactive hyperaemic forearm blood flow did not differ between groups. Forearm blood flow responses to each dose of acetylcholine were significantly greater in control than diabetic subjects (p〈0.01 for all doses). NG monomethyl-l-arginine attenuated forearm blood flow from maximal stimulated values when responses were compared with the natural decline to acetylcholine in forearm flow in both control and diabetic subjects (p〈0.05 for both groups), but had no effect on basal blood flow responses. Forearm blood flow responses to each dose of glyceryl trinitrate were significantly greater in control than diabetic subjects (p〈0.05 for all). These data provide evidence for endothelial and smooth muscle dysfunction in diabetes which may have important therapeutic implications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429099
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dietary fish oil augments nitric oxide production or release in patients with Type 2 (non-insulin-dependent) diabetes mellitus (1993)
    Springer
    Diabetologia 36 (1993), S. 33-38 
    Details
    ISSN: 1432-0428
    Keywords: Acetylcholine ; NG monomethyl-l-arginine ; nitric oxide ; glyceryl trinitrate ; fish oils ; Type 2 (non-insulin-de-pendent) diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Decreased release of nitric oxide from damaged endothelium is responsible for the impaired endothelium-dependent vasodilator responses found in animal models of vascular disease. Dietary supplementation with fish oils has been shown to augment endothelium-dependent relaxations, principally by improving the release of nitric oxide from injured endothelium. Using forearm venous occlusion plethysmography we studied vascular responses to 60, 120, 180 and 240 nmol/min of acetylcholine (an endothelium-dependent vasodilator) and 3, 6 and 9 nmol/min of glyceryl trinitrate (an endothelium-independent vasodilator) infused into the brachial artery in 23 patients with Type 2 (non-insulin-dependent) diabetes mellitus. NG monomethyl-l-arginine was employed to inhibit stimulated and basal release of nitric oxide from the endothelium. On completion of the baseline studies patients randomly received either fish oil or matching olive oil capsules in a double-blind crossover fashion for 6 weeks followed by a 6-week washout period and a final 6-week treatment phase. Studies, identical to the initial baseline studies, were performed at the end of the active treatment periods at 6 and 18 weeks. Fish oil supplementation significantly improved forearm blood flow responses to each dose of acetylcholine when compared to the vasodilator responses recorded at baseline and after olive oil administration (p〈0.01). Neither fish oil nor olive oil supplementation produced any significant changes in forearm blood flow to the incremental infusions of glyceryl trinitrate when compared with responses recorded during the baseline studies. NG monomethyl-l-arginine significantly reduced forearm blood flow from maximal stimulated values to acetylcholine when compared to the uninhibited decline in flow to acetylcholine infusions at comparable time points (p〈0.01). Treatment with fish oils improved endothelium-dependent responses to acetylcholine without altering endothelium-independent responses to glyceryl trinitrate. By increasing stimulated nitric oxide release from the endothelium fish oils may afford protection against vasospasm and thrombosis in patients with diabetes mellitus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399090
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Calcification of the human thoracic aorta during aging (1994)
    Springer
    Calcified tissue international 54 (1994), S. 268-273 
    Details
    ISSN: 1432-0827
    Keywords: Aging ; Aorta ; Calcium ; Elastin ; Arteriosclerosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract The rate of calcification within the human thoracic aorta from completion of body growth to advanced old age was examined. Fifty-eight aortae, obtained at necropsy, were dissected into four layers: the complete intima and the separated media, which was subdivided into three tissue samples of equal thickness, defined as the media-inner,-middle, and-outer layers. The sampling sites selected for analysis were from regions of the aortic surface that were free of atherosclerotic plaques. The calcium content within each tissue layer of the aorta was determined. Arterial wall thickness and the cholesterol content of the four layers were also measured. Intimal calcification increased progressively during aging: from 1.6 μg Ca/mg tissue at 20 years of age to 5.2 μg Ca/mg tissue by 90 years of age. When intima calcium concentration was expressed by tissue volume (w/v), no significant change during aging was found. Medical calcification, as w/v and by w/w, increased throughout aging. Calcium accumulation was most marked in the middle, elastin-rich layer of the media, increasing from 1.4 μg Ca/mg tissue at 20 years of age to 49.50 μg Ca/mg tissue by 90 years of age. Calcium levels also increased in the other media layers, but at a slower rate then that found within the middle media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295949
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    Paper (German National Licenses)
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