In septic shock, which vasopressor is preferred as first-line due to better outcomes and fewer adverse events than alternatives?

In septic shock, which vasopressor is preferred as first-line due to better outcomes and fewer adverse events than alternatives?

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

Answer: (C)

Counteracting the profound vasodilation in septic shock with a vasopressor that reliably raises mean arterial pressure while minimizing adverse effects is the key idea. Norepinephrine is preferred because its strong alpha-adrenergic effect raises systemic vascular resistance and arterial pressure, while its modest beta-1 activity supports cardiac output without causing excessive heart rate increases. This profile tends to yield better outcomes and fewer adverse events than other vasopressors. Dopamine, by contrast, is more likely to cause arrhythmias and has been linked to worse outcomes in septic shock. Phenylephrine is a pure alpha agonist that can raise pressure but often reduces cardiac output and can compromise organ perfusion, making it less favorable as a first-line choice. Epinephrine can improve pressure but brings higher risks of tachyarrhythmias and increased lactate, without superior overall benefit over norepinephrine in most septic-shock patients. So norepinephrine best achieves the goal of stabilizing perfusion with the lowest risk of complications.

Counteracting the profound vasodilation in septic shock with a vasopressor that reliably raises mean arterial pressure while minimizing adverse effects is the key idea. Norepinephrine is preferred because its strong alpha-adrenergic effect raises systemic vascular resistance and arterial pressure, while its modest beta-1 activity supports cardiac output without causing excessive heart rate increases. This profile tends to yield better outcomes and fewer adverse events than other vasopressors.

Dopamine, by contrast, is more likely to cause arrhythmias and has been linked to worse outcomes in septic shock. Phenylephrine is a pure alpha agonist that can raise pressure but often reduces cardiac output and can compromise organ perfusion, making it less favorable as a first-line choice. Epinephrine can improve pressure but brings higher risks of tachyarrhythmias and increased lactate, without superior overall benefit over norepinephrine in most septic-shock patients. So norepinephrine best achieves the goal of stabilizing perfusion with the lowest risk of complications.