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- W2074062016 abstract "In isolated canine coronary arteries previously contracted by high potassium concentration, angiographic contrast medium decreased active tension by 61 +/- 2%. The relaxant effect was dose dependent and was not prevented by beta-blockade with d-l-propranolol (10(-5) M). This effect was similar to that obtained with nitroglycerin (10(-6) M), and further relaxation was evident when this vasodilator was administered after exposure to the contrast medium. When arteries were precontracted by alpha-receptor stimulation with norepinephrine (10(-5) M) at normal potassium concentration, a maximal relaxation of 83 +/- 6% was elicited after exposure to contrast medium. The relaxant effect could not be reproduced by a similar increase in osmolarity brought about by addition of sucrose. When arterial strips were processed by radioimmunoassay for dosage of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) after the relaxing action of the contrast medium occurred, a decrease in cAMP from 2.61 +/- 0.86 to 0.63 +/- 0.1 pmol/mg protein (p less than 0.05) was observed, whereas no significant changes in cGMP were detected. These nucleotides do not appear to be involved in the relaxant effect of the dye in the same way as they are when relaxation is elicited by some other coronary vasodilators." @default.
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- W2074062016 title "Effects of angiographic contrast medium on isolated canine coronary arteries" @default.
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- W2074062016 doi "https://doi.org/10.1016/0002-9149(82)91247-4" @default.
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