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- W2056532921 abstract "Many vasoconstrictors (spasmogens) may cause arterial graft spasm; however, there is lack of an overview of the nature of vasoconstriction in grafts. This study was designed to investigate the response of three major arterial grafts currently used for coronary artery bypass grafting to various vasoconstrictor substances. Segments of three arterial grafts (gastroepiploic [GEA], n = 28; internal mammary [IMA], n = 213; inferior epigastric [IEA], n = 24) taken from patients undergoing coronary artery bypass grafting were studied in organ baths under a physiologic pressure. Cumulative concentration-contraction curves were established for the following vasoconstrictor substances: endothelin-1, U46619, prostaglandin F2 alpha, norepinephrine, methoxamine, phenylephrine, 5-hydroxytryptamine, and potassium chloride (K+). In IMA, the highest contraction force was induced by U46619 (5.69 +/- 0.48 g), endothelin-1 (4.43 +/- 0.4 g), PGF2 alpha (6.29 +/- 1.42 g), and K+ (4.58 +/- 0.5 g). Internal mammary artery is highly sensitive to endothelin-1 (EC50, -8.13 +/- 0.08 log M) and U46619 (EC50, -8.21 +/- 0.21 log M) (lower than any other vasoconstrictors, p < 0.001). Next sensitive vasoconstrictors were PGF2 alpha and norepinephrine. 5-Hydroxytryptamine induced significantly higher contraction force in the IMA without endothelium (2.8 +/- 0.64 g versus 1.4 +/- 0.23 g, p < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2056532921 created "2016-06-24" @default.
- W2056532921 creator A5026868249 @default.
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- W2056532921 date "1995-03-01" @default.
- W2056532921 modified "2023-10-10" @default.
- W2056532921 title "Overview of the nature of vasoconstriction in arterial grafts for coronary operations" @default.
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- W2056532921 doi "https://doi.org/10.1016/0003-4975(94)01011-0" @default.
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