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- W2005559165 abstract "The role β-adrenoceptors in the control of venous tone is not clear. This study examines the dose-response effects of isoprenaline, a non-selective β-adrenoceptor agonist, on mean circulatory filling pressure (MCFP), an index of body venous tone, in conscious and unrestrained rats. Dose-response curves of isoprenaline were constructed in three groups of rats, namely, I, intact; III, pretreated with the ganglionic blocker hexamethonium; and V, pretreated with noradrenaline. Three additional groups, Groups II, IV and VI, served as time controls and were treated similar to I, III and V, respectively, except that they were given normal saline in place of isoprenaline. The infusion of isoprenaline in intact rats dose dependently decreased mean arterial pressure (MAP) and increased heart rate (HR) and MCFP while in the ganglionic-blocked rat, it caused similar effects on MAP and HR but had no significant effects on MCFP. In rats given noradrenaline, isoprenaline again decreased MAP and increased HR and, in contrast to the other two groups, it decreased MCFP. The results show that isoprenaline has variable venous effects depending on existing venous tone. It causes reflex-mediated venoconstriction under normal conditions due to its hypotensive effects and direct venodilatation when venous tone is elevated by the infusion of noradrenaline." @default.
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- W2005559165 date "1990-11-01" @default.
- W2005559165 modified "2023-09-25" @default.
- W2005559165 title "Differential venous effects of isoprenaline in conscious rats" @default.
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- W2005559165 doi "https://doi.org/10.1016/0014-2999(90)94196-5" @default.
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