If the patient’s heart rate is low, which drug is preferred for inotropic support?

If the patient’s heart rate is low, which drug is preferred for inotropic support?

• A. Dopamine
• B. Dobutamine
• C. Epinephrine
• D. Norepinephrine

Answer: (A)

When heart rate is low, you want an inotrope that both boosts contractility and helps raise heart rate to improve cardiac output and blood pressure. Dopamine fits this need because it has dose-dependent effects on receptors: at moderate doses it stimulates beta-1 receptors, increasing myocardial contractility and heart rate; at higher doses it also activates alpha receptors, raising vascular tone to support blood pressure. This combination makes it particularly useful when bradycardia accompanies hypotension. Other agents either focus mainly on inotropy with vasodilation (which can drop blood pressure), or increase heart rate and circulation but at the cost of higher oxygen demand or less favorable pressure effects, so dopamine is the preferred choice in this scenario.

When heart rate is low, you want an inotrope that both boosts contractility and helps raise heart rate to improve cardiac output and blood pressure. Dopamine fits this need because it has dose-dependent effects on receptors: at moderate doses it stimulates beta-1 receptors, increasing myocardial contractility and heart rate; at higher doses it also activates alpha receptors, raising vascular tone to support blood pressure. This combination makes it particularly useful when bradycardia accompanies hypotension. Other agents either focus mainly on inotropy with vasodilation (which can drop blood pressure), or increase heart rate and circulation but at the cost of higher oxygen demand or less favorable pressure effects, so dopamine is the preferred choice in this scenario.