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- W2361002012 abstract "Objective To study the method to inhibit perioperative internal mammary artery(IMA) spasm from the perspective of muscarinic receptor,and research the function of muscarinic cholinergic receptor subtypes of IMA.Methods IMA segments in vitro with intact endothelium were obtained from 30 patients who underwent coronary artery bypass grafting(CABG).According to muscarinic receptor antagonists of different concentrations,They were divided into control group(not using receptor antagonist),atropine group(non-selective M receptor antagonist),pirenzepine group(M1 receptor antagonist) and Methoctramine group(M2 receptor antagonist) by random number table.The effects of antagonists on vasodilatation were analyzed,Scott ratio was used to calculate affinity index(pD2) and Schild plot was used to count rivalry index(pA2). Results Acetylcholine(Ach)-induced concentration-dependent relaxation response of IMA segments with intact endothelium precontracted with potassium chloride(KCl).The pD2 was 6.92±0.05.The effects of atropine,pirenzepine and methoctramine on dose-response curve induced by Ach with intact endothelium were all concentration-dependent.With the increase of the concentration of antagonists,the Ach-induced dose-response curves had a significant shift to right(P0.05).Atropine,pirenzepine and Methoctramine competitively antagonized the reaction of vessel to Ach.The pA2 were 9.62±0.15,7.70±0.08 and 6.30±0.08,respectively.Conclusion The Ach-induced relaxation response of IMA with intact endothelium is concentration-dependent.According to the affinity of different antagonist,IMA in Vitro Ach-induced relaxation response is implemented by acting on non-neuronal muscarinic cholinergic M1 receptor subtype." @default.
- W2361002012 created "2016-06-24" @default.
- W2361002012 creator A5042338969 @default.
- W2361002012 date "2009-01-01" @default.
- W2361002012 modified "2023-09-26" @default.
- W2361002012 title "Study on the Function of Muscarinic Cholinergic Receptor Subtypes of Internal Mammary Artery in Vitro" @default.
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