What is the desired action of epinephrine in asystole?

What is the desired action of epinephrine in asystole?

• A. Increases vasoconstriction to improve CPR effectiveness
• B. Decreases systemic vascular resistance
• C. Increases heart rate directly
• D. Causes vasodilation

Answer: (D)

In asystole, the key goal is to improve perfusion pressure during CPR to raise the chance of return of spontaneous circulation. Epinephrine works mainly by activating alpha-adrenergic receptors, which causes peripheral vasoconstriction. This increases systemic vascular resistance and raises diastolic aortic pressure, strengthening coronary and cerebral perfusion during compressions. While epinephrine also has beta-adrenergic effects that can increase heart rate and contractility, there is no organized rhythm to drive those effects in asystole, so the vasoconstrictive action to boost perfusion is the primary benefit. Therefore, the desirable action is vasoconstriction. Vasodilation would lower perfusion pressures, and directly increasing heart rate isn’t meaningful without a pulse, while decreasing vascular resistance would work against the goal of improving perfusion during CPR.

In asystole, the key goal is to improve perfusion pressure during CPR to raise the chance of return of spontaneous circulation. Epinephrine works mainly by activating alpha-adrenergic receptors, which causes peripheral vasoconstriction. This increases systemic vascular resistance and raises diastolic aortic pressure, strengthening coronary and cerebral perfusion during compressions. While epinephrine also has beta-adrenergic effects that can increase heart rate and contractility, there is no organized rhythm to drive those effects in asystole, so the vasoconstrictive action to boost perfusion is the primary benefit. Therefore, the desirable action is vasoconstriction. Vasodilation would lower perfusion pressures, and directly increasing heart rate isn’t meaningful without a pulse, while decreasing vascular resistance would work against the goal of improving perfusion during CPR.