Abstract
The coronary vasomotor responses to acetylcholine, serotonin (5-HT) and to isosorbide dinitrate were assessed by quantitative coronary arteriography in 31 patients.
Acetylcholine induced constrictions in diseased coronary arteries (n=15). In the patients with smooth normal coronary arteriograms, acetylcholine caused dilatations in 7 patients (smooth dilators) and constrictions in 9 patients (smooth constrictors). 5-HT evoked no significant diameter changes in the smooth dilators (+1.4 ± 4.1%), but in the smooth constrictors and in the patients with diseased coronary arteries 5-HT caused potent constrictions. The vasoconstrictor responses to 5-HT were similar in patients with minimal (-26.5 ± 4.7%) and with advanced atherosclerosis (-30.9 ± 5.3%). Isosorbide dinitrate reversed rapidly the vasoconstriction induced by 5-HT.
Both in early and advanced atherosclerosis, impairment of endothelium-dependent vasodilation causes a hypersensitivity of the coronary artery to the vasoconstrictor stimulus of 5-HT.
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Vrints, C.J., Bosmans, J., Bult, H., Herman, A.G., Snoeck, J.P. (1993). Abnormal Coronary Vasoconstrictor Responses to Serotonin in Patients with Ischemic Heart Disease. In: Vanhoutte, P.M., Saxena, P.R., Paoletti, R., Brunello, N., Jackson, A.S. (eds) Serotonin. Medical Science Symposia Series, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1920-7_37
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DOI: https://doi.org/10.1007/978-94-011-1920-7_37
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