A client with hypotension requires a vasopressor to increase blood pressure. The provider wants to avoid an increase in heart rate. Which medication should the nurse anticipate administering?

Rationale: A. Dopamine: Dopamine is a dose-dependent catecholamine that can increase heart rate and cardiac contractility through beta-1 adrenergic stimulation. While it can raise blood pressure, it often causes tachycardia, making it less suitable when the goal is to avoid heart rate elevation. B. Norepinephrine: Norepinephrine primarily stimulates alpha-1 adrenergic receptors, increasing vascular resistance and blood pressure. However, it also has some beta-1 activity, which can lead to reflex or direct increases in heart rate, so it may not fully prevent tachycardia. C. Epinephrine: Epinephrine strongly stimulates both alpha and beta receptors, increasing blood pressure, heart rate, and cardiac output. Because it consistently raises heart rate, it is not appropriate when avoiding tachycardia is a priority. D. Phenylephrine: Phenylephrine is a pure alpha-1 adrenergic agonist that causes vasoconstriction and increases blood pressure without significant beta-1 stimulation. This makes it ideal for clients who need a blood pressure increase while minimizing the risk of tachycardia or increased cardiac workload.