Circulation, Vol 73, 572-578, Copyright © 1986 by American Heart Association
JH Ashton, CR Benedict, C Fitzgerald, S Raheja, A Taylor, WB Campbell, LM Buja and JT Willerson
The data obtained in this study demonstrate that the concentration of
serotonin is markedly elevated (18- to 27-fold) at the site of a coronary
arterial stenosis in open-chest, anesthetized dogs with cyclic flow
variations. Cyclic flow variations in this experimental preparation were
abolished by ketanserin, a 5-hydroxytryptamine antagonist, but serotonin
concentration at the site of the coronary stenosis remained elevated. The
intra-atrial administration of serotonin (0.16 to 1 mg/min) restored cyclic
flow variations after they had been abolished by ketanserin. Taken
together, these data suggest that serotonin may be one of the important
mediators of cyclic flow variations in this experimental preparation.
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