Which push-dose vasopressor can be used as an alternative to epinephrine for non-traumatic shock?

Which push-dose vasopressor can be used as an alternative to epinephrine for non-traumatic shock?

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

Answer: (D)

The key idea is to raise blood pressure quickly in non-traumatic shock while minimizing effects on the heart. Phenylephrine is a pure alpha-1 agonist, so it constricts peripheral vessels and increases systemic vascular resistance, which raises mean arterial pressure without directly increasing heart rate or myocardial contractility. That makes it a good alternative to epinephrine when you want to avoid stimulating beta receptors (which would raise heart rate and myocardial oxygen demand). In non-traumatic (often distributive) shock, restoring perfusion pressure promptly is the priority, and phenylephrine achieves this with a lower risk of tachycardia compared with epinephrine or dopamine. Norepinephrine and dopamine can still raise BP but carry more beta effects or dose-related tachycardia and other risks. So the best alternative push-dose vasopressor in this scenario is phenylephrine.

The key idea is to raise blood pressure quickly in non-traumatic shock while minimizing effects on the heart. Phenylephrine is a pure alpha-1 agonist, so it constricts peripheral vessels and increases systemic vascular resistance, which raises mean arterial pressure without directly increasing heart rate or myocardial contractility. That makes it a good alternative to epinephrine when you want to avoid stimulating beta receptors (which would raise heart rate and myocardial oxygen demand).

In non-traumatic (often distributive) shock, restoring perfusion pressure promptly is the priority, and phenylephrine achieves this with a lower risk of tachycardia compared with epinephrine or dopamine. Norepinephrine and dopamine can still raise BP but carry more beta effects or dose-related tachycardia and other risks. So the best alternative push-dose vasopressor in this scenario is phenylephrine.