In the cardiovascular system, what is the primary effect of a low-dose Dopamine infusion (0.5-2 mcg/kg/min)?
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Correct answer: Vasodilation of renal and mesenteric vascular beds via D1 receptors
At low doses, dopamine preferentially binds to D1 dopaminergic receptors, leading to vasodilation in the renal, mesenteric, and coronary beds. This increases renal blood flow and promotes natriuresis, which is clinically distinct from the cardiac and pressor effects seen at higher doses.
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