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- W2038685939 abstract "Adrenoceptor function in the human internal thoracic artery (ITA) was characterized in vitro using segments of the artery obtained during coronary bypass operations. Specimens were prepared as isolated arterial rings mounted in a tissue bath, and mechanical activity (isometric tension) was measured in response to drugs. The ITA responded to phenylephrine (PE), epinephrine, and norepinephrine with concentration-dependent contractions. The PE-induced contractions were antagonized by phenoxybenzamine, prazosin, and high concentrations of yohimbine. The ITA was not effectively contracted by clonidine in the concentration range normally associated with α 2 -adrenoceptor stimulation. The β-adrenoceptor agonist, isoproterenol, had a weak and variable effect on the ITA; samples from 9 out of 12 subjects did not respond to isoproterenol, whereas samples from 3 subjects responded with relaxations of between 33 and 42%. These in vitro studies indicate that the most important adrenoceptors of the human ITA are α-adrenoceptors; this may be relevant for the pharmacologic management of patients undergoing coronary bypass surgery using the ITA.Key words: human internal thoracic artery, α-adrenoceptors, β-adrenoceptors, phenylephrine, prazosin." @default.
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- W2038685939 date "1991-06-01" @default.
- W2038685939 modified "2023-09-24" @default.
- W2038685939 title "Adrenoceptors of the human internal thoracic artery" @default.
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- W2038685939 doi "https://doi.org/10.1139/y91-119" @default.
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