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Adrenaline Low Dose Beta-2 — FRCA Primary MCQ

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HardPharmacology - CardiovascularAdrenaline Low Dose Beta-2FRCA Primary

At low infusion rates, which adrenergic effect of adrenaline is most prominent in the peripheral circulation?

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Correct answer: B — Beta-2-mediated vasodilation in skeletal muscle beds

The best answer is “Beta-2-mediated vasodilation in skeletal muscle beds”. At relatively low concentrations, beta effects predominate and beta-2-mediated vasodilation can reduce systemic vascular resistance, especially in skeletal muscle beds. Increasing concentration recruits alpha-1 vasoconstriction. Adrenaline is not a dopamine agonist and does not produce central alpha-2 sedation.

Reference: RCoA, FRCA Primary MCQ examination: https://rcoa.ac.uk/examinations/primary-frca-examination/frca-primary-mcq-examination