Fig. 1From: Unexpected hypotension in catecholamine reversal: a case reportAlpha-adrenergic and β-adrenergic effects of vasoactive catecholamines. Alpha-adrenergic receptors promote peripheral vasoconstriction, β1-adrenergic receptors increase chronotropic and inotropic effects, and β2-adrenergic receptors increase vasodilation. If α-adrenergic receptor antagonists are simultaneously administered with catecholamine agents, α-adrenergic effects are masked, and β-adrenergic effects are predominantly enhanced. Consequently, vasodilation occurs and blood pressure decreases. HR heart rateBack to article page