What does dopamine do in this context?

What does dopamine do in this context?

• A. Speeds up the heart rate and increases cardiac contractility
• B. Slows the heart rate and decreases contractility
• C. Causes vasodilation and lowers blood pressure
• D. Reduces respiratory rate

Answer: (A)

Dopamine in this context mainly acts on the heart to increase its performance. At moderate therapeutic doses, it stimulates beta-1 receptors in the heart, which raises both heart rate (chronotropy) and the force of contraction (inotropy). This boosts cardiac output and improves tissue perfusion in states like hypotension or shock. That direct effect on heart rate and contractility is why the description fits best. While dopamine can have other vascular effects at different doses, the core clinical action here is enhancing cardiac performance, not slowing the heart, dilating vessels to lower blood pressure, or reducing respiratory rate.

Dopamine in this context mainly acts on the heart to increase its performance. At moderate therapeutic doses, it stimulates beta-1 receptors in the heart, which raises both heart rate (chronotropy) and the force of contraction (inotropy). This boosts cardiac output and improves tissue perfusion in states like hypotension or shock. That direct effect on heart rate and contractility is why the description fits best. While dopamine can have other vascular effects at different doses, the core clinical action here is enhancing cardiac performance, not slowing the heart, dilating vessels to lower blood pressure, or reducing respiratory rate.