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• W2072144565 abstract "The present study, involving 56 healthy subjects from a health screening, was undertaken to address some methodological questions regarding the measurement of endothelial function using local intra-arterial infusions of metacholine (2 and 5 micrograms min-1) to evaluate endothelium-dependent vasodilatation, and sodium nitroprusside (SNP, 5 and 10 micrograms min-1) to evaluate endothelium-independent vasodilatation. Forearm blood flow (FBF) was measured by venous occlusion plethysmography. The ratio of FBF during the highest dose of metacholine to FBF during the highest dose of SNP was used as an index of endothelial function. In 10 young volunteers the procedure was repeated after 2 h and again after 3 weeks in order to study short-term and long-term reproducibility of the method. Neither the vasodilatatory response to metacholine (r = 0.006) nor that to SNP (r = 0.08) was related to resting FBF. Neither the circumference nor the length of the arm was related to endothelial function (r = 0.01-0.11), as evaluated by the FBF on metacholine to nitroprusside ratio (mean 1.3 +/- 0.3 SD). The use of a wrist cuff to exclude hand circulation, or not, did not influence the evaluation of endothelial function significantly. Maximal FBF after 3 min of arterial occlusion of the forearm was significantly related to blood flow during both metacholine (r = 0.53, P < 0.01) and nitroprusside infusion (r = 0.36, P < 0.05), but not to the FBF on metacholine to nitroprusside ratio (r = 0.01). The short-term and long-term reproducibility of FBF during vasodilatation with metacholine and SNP was good (r = 0.89-0.97, P < 0.001), while the individual measurements for resting FBF were less reproducible when repeated after 3 weeks (r = 0.34). In conclusion, endothelial function was not related to resting FBF, nor to the arm circumference or length. No major difference was seen whether endothelial function was evaluated with or without exclusion of the hand circulation. Maximal FBF during reactive hyperaemia was not related to endothelial function." @default.
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• W2072144565 title "Methodological aspects of the evaluation of endothelium-dependent vasodilatation in the human forearm" @default.
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• W2072144565 doi "https://doi.org/10.1046/j.1365-2281.1998.00077.x" @default.
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