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• W2070173134 abstract "Endothelial dysfunction is a common phenomenon after cardiac transplantation. However, qualitative differences in endothelial vasoregulation at different coronary segments and at different postoperative times have rarely been explored. To uncover the functional variations of endothelium responses we infused the endothelium-dependent vasodilator acetylcholine (50 μg) followed by the endothelium-independent vasodilator 3-morpholinosydnonimine (SIN-1)(1 mg; 16 patients) or nitroglycerin (0.3 mg; 14 patients) sequentially into the left coronary artery. We investigated the responses of 120 nonstenotic coronary segments (proximal and distal left anterior descending and right circumflex coronary arteries) in 30 patients with quantitative angiography (group 1: 13 patients, 12 ± 1 months after cardiac transplantation; group 2: 17 patients, 55 ± 3 months after cardiac transplantation). Continuous-flow measurement was performed to exclude significant reduction of microvascular response influencing epicardial dilation. Five responses to acetylcholine administration followed by nitrates were observed. On the one end of the spectrum, segments dilate to acetylcholine administration with no further dilation to exogenous nitric oxide, indicating completely preserved endothelial function. On the other end, segments constrict to acetylcholine with no change after endogenous nitric oxide, reflecting a defective endothelial and defective smooth muscle function. The different patterns of coronary vasomotor tone responses to endogenous nitric oxide followed by exogenous nitric oxide represent different degrees of endothelial function after cardiac transplantation. In addition, the functional assessment of endothelial integrity shows qualitative time-dependent differences between proximal and distal coronary parts. The existence of coronary segments with functioning endothelium indicates that the latter is not diffusely disturbed in all cardiac transplant recipients and that the endothelial damage is perhaps not irreversibly lost. (Am Heart J 1997;134:306-15.)" @default.
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• W2070173134 date "1997-08-01" @default.
• W2070173134 modified "2023-09-27" @default.
• W2070173134 title "Variations of segmental endothelium-dependent and endothelium-independent vasomotor tone after cardiac transplantation (qualitative changes in endothelial function)" @default.
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• W2070173134 doi "https://doi.org/10.1016/s0002-8703(97)70139-x" @default.
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