Summary
Tachycardia and an increase in myocardial metabolism result from the sympathetic activation that occurs during baroreceptor reflexes, emotion, and exercise. Paradoxically, a concomitant adrenergic α-receptor-mediated coronary vasoconstriction competes with the local metabolic coronary vasodilation that occurs during these conditions, and thereby limits metabolic hyperemia. Measurements of transmural blood flow in α-receptor blocked and α-receptor intact regions of the left ventricle during exercise demonstrate that adrenergic vasoconstriction helps maintain blood flow to the vulnerable subendocardium during tachycardia. This may be the explanation as to why paradoxical adrenergic coronary vasoconstriction has evolved. During controlled conditions of constant coronary flow, an anti-transmural steal effect due to adrenergic vasoconstriction in the subepicardium can be demonstrated during ischemic conditions. These observations demonstrate unexpected beneficial effects of adrenergic coronary vasoconstriction during tachycardia and cardiovascular stress.
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© 1991 Springer-Verlag Berlin Heidelberg
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Feigl, E.O. (1991). Adrenergic Control of Transmural Coronary Blood Flow. In: Heusch, G., Ross, J. (eds) Adrenergic Mechanisms in Myocardial Ischemia. Steinkopff, Heidelberg. https://doi.org/10.1007/978-3-662-11038-6_14
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DOI: https://doi.org/10.1007/978-3-662-11038-6_14
Publisher Name: Steinkopff, Heidelberg
Print ISBN: 978-3-662-11040-9
Online ISBN: 978-3-662-11038-6
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