Which vasopressor is commonly used for hypotension in cardiogenic shock?

Which vasopressor is commonly used for hypotension in cardiogenic shock?

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

Answer: (B)

In cardiogenic shock with hypotension, the aim is to raise mean arterial pressure and improve perfusion without unduly increasing heart workload or causing dangerous heart rhythms. Norepinephrine does this best because its strong alpha-1 effect raises systemic vascular resistance and diastolic pressure, which boosts coronary and cerebral perfusion. It also provides some beta-1 activity, which can help support heart contractility, but without the excessive tachycardia and high oxygen demand seen with epinephrine. This balance makes norepinephrine the preferred first-line vasopressor in this situation. Epinephrine can improve pressure but often at the cost of significant tachycardia and higher myocardial oxygen consumption, which can worsen ischemia. Dopamine also carries a higher risk of arrhythmias and variable effects on workload. Phenylephrine increases afterload with pure alpha-1 vasoconstriction and can further reduce cardiac output in a failing heart. So, among the options, norepinephrine best supports perfusion in cardiogenic shock while keeping myocardial demand more in check. If needed, an inotrope like dobutamine can be added once blood pressure is stabilized.

In cardiogenic shock with hypotension, the aim is to raise mean arterial pressure and improve perfusion without unduly increasing heart workload or causing dangerous heart rhythms. Norepinephrine does this best because its strong alpha-1 effect raises systemic vascular resistance and diastolic pressure, which boosts coronary and cerebral perfusion. It also provides some beta-1 activity, which can help support heart contractility, but without the excessive tachycardia and high oxygen demand seen with epinephrine. This balance makes norepinephrine the preferred first-line vasopressor in this situation.

Epinephrine can improve pressure but often at the cost of significant tachycardia and higher myocardial oxygen consumption, which can worsen ischemia. Dopamine also carries a higher risk of arrhythmias and variable effects on workload. Phenylephrine increases afterload with pure alpha-1 vasoconstriction and can further reduce cardiac output in a failing heart. So, among the options, norepinephrine best supports perfusion in cardiogenic shock while keeping myocardial demand more in check. If needed, an inotrope like dobutamine can be added once blood pressure is stabilized.