In a septic patient with hypotension and high cardiac output, which vasopressor is least appropriate?

In a septic patient with hypotension and high cardiac output, which vasopressor is least appropriate?

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

Answer: (A)

The key idea is treating septic shock with a vasodilatory state by increasing vascular tone rather than trying to push cardiac output higher. In septic patients who are hypotensive but have a high cardiac output, the problem is exaggerated vasodilation and low systemic vascular resistance. Dobutamine boosts heart contractility but also tends to dilate vessels (beta-2 effects) and can lower systemic vascular resistance, which can drop blood pressure further when support is already needed to raise MAP. That’s why it’s not appropriate as the primary vasoactive choice in this scenario. The other agents act mainly to raise vascular tone and MAP—norepinephrine is the first-line vasopressor, with epinephrine or dopamine as alternatives—addressing the vasodilation that characterizes this phase of septic shock. Dobutamine remains useful if there’s concurrent or predominant myocardial dysfunction with low output, but given hypotension with high CO, it’s the least suitable option here.

The key idea is treating septic shock with a vasodilatory state by increasing vascular tone rather than trying to push cardiac output higher. In septic patients who are hypotensive but have a high cardiac output, the problem is exaggerated vasodilation and low systemic vascular resistance. Dobutamine boosts heart contractility but also tends to dilate vessels (beta-2 effects) and can lower systemic vascular resistance, which can drop blood pressure further when support is already needed to raise MAP. That’s why it’s not appropriate as the primary vasoactive choice in this scenario. The other agents act mainly to raise vascular tone and MAP—norepinephrine is the first-line vasopressor, with epinephrine or dopamine as alternatives—addressing the vasodilation that characterizes this phase of septic shock. Dobutamine remains useful if there’s concurrent or predominant myocardial dysfunction with low output, but given hypotension with high CO, it’s the least suitable option here.