Key result
Beta-2 adrenergic receptors constitute approximately 25% of total beta-receptors in dog atria but mediate about 50% of the isoproterenol-induced shortening of action potential duration.
p-value: p=<0.0001
Beta 2-adrenergic receptors are present on dog atrial muscle cells and contribute significantly to catecholamine-stimulated shortening of action potential duration.
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Requires validation in human tissue before clinical translation; leaves open beta-2 targeting in atrial electrophysiology.
Liang et al. (1985) studied Healthy (preclinical animal model). Isoproterenol with selective beta-antagonists (ICI 118,551 and ICI 89,406) vs. Baseline / nonselective antagonist (propranolol) was evaluated on Proportion of isoproterenol-induced APD75 shortening mediated by beta-2 receptors (p=<0.0001). Beta-2 adrenergic receptors constitute approximately 25% of total beta-receptors in dog atria but mediate about 50% of the isoproterenol-induced shortening of action potential duration.
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