During your rural posting after the internship, you encounter a patient of acute cardiac failure. Your preferred drug for this condition is dobutamine. However, it is not available there. Which of the following other drugs, or combination of drugs, would be a suitable alternative, giving the pharmacologic equivalent of what you want the dobutamine to do?

**Core Concept**
Dobutamine is a synthetic catecholamine that acts as a beta-1 agonist, increasing heart rate and contractility, and as a beta-2 agonist, causing vasodilation. The goal in treating acute cardiac failure is to improve cardiac output and reduce afterload.

**Why the Correct Answer is Right**
In the absence of dobutamine, a combination of dopamine and norepinephrine could be used to achieve a similar effect. Dopamine, at low doses, acts as a beta-1 agonist, increasing heart rate and contractility, similar to dobutamine. At higher doses, dopamine also acts as a vasopressor, increasing vascular tone. Norepinephrine, a potent alpha-1 agonist, increases vascular tone and afterload, allowing the heart to pump more effectively against the increased resistance. This combination would provide the equivalent pharmacologic effect of dobutamine.

**Why Each Wrong Option is Incorrect**
**Option A:** Epinephrine is a non-selective alpha and beta agonist, which could increase afterload and worsen cardiac failure.
**Option B:** Furosemide is a diuretic that reduces fluid overload but does not directly increase cardiac contractility or output.
**Option C:** Metoprolol is a beta-blocker that would decrease heart rate and contractility, exacerbating cardiac failure.

**Clinical Pearl / High-Yield Fact**
When using dopamine and norepinephrine together, start with low doses of dopamine (2-5 mcg/kg/min) and titrate upwards as needed, while concurrently adjusting norepinephrine doses to avoid excessive vasopressor effects.

**Correct Answer:** D.

✓ Correct Answer: C. Norepinephrine plus phentolamine