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- W2074996906 abstract "Abstract Background The vasoconstrictor action of endothelin‐1 (ET‐1) is mediated through ET A and ET B receptor subtypes on vascular smooth muscle. ET B receptors are also present on the vascular endothelium where they mediate vasodilation. Animal studies suggest that the ET B receptor also acts as a clearance receptor for endothelin. Aims To investigate the effects of a selective ET A and a selective ET B receptor antagonist alone and in combination on haemodynamics and circulating concentrations of ET‐1 in patients with chronic heart failure. Results Infusion of BQ‐123 ( n =10), a selective ET A receptor antagonist, led to systemic vasodilation and did not change plasma ET‐1 concentrations (1.38±0.82 to 1.38±0.91 fmol/ml, ns). Infusion of BQ‐788 ( n =8) led to systemic vasoconstriction with a rise in plasma ET‐1 (1.84±1.06 to 2.73±0.99 fmol/ml, p <0.01). The addition of BQ‐123 to BQ‐788 led to systemic and pulmonary vasodilation with no further increase in plasma ET‐1 concentrations (2.80±1.14 to 2.90±1.20 fmol/ml, ns). Conclusion The rise in plasma ET‐1 concentrations in response to selective blockade of ET B receptors and the associated adverse haemodynamic effects suggest that ET B receptors have a role in the clearance of ET‐1 in man and that their blockade may not be advantageous for patients with heart failure." @default.
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- W2074996906 date "2005-01-01" @default.
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- W2074996906 title "Comparison of selective ETAand ETBreceptor antagonists in patients with chronic heart failure" @default.
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- W2074996906 doi "https://doi.org/10.1016/j.ejheart.2004.08.001" @default.
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