Which is the first-line treatment for anaphylactic shock?

Which is the first-line treatment for anaphylactic shock?

• A. Diphenhydramine
• B. Glucocorticoids
• C. Albuterol
• D. Epinephrine

Answer: (D)

Anaphylaxis requires epinephrine as the first-line treatment because it rapidly reverses the life-threatening changes in airway, breathing, and circulation. Epinephrine hits multiple targets at once: alpha-1 receptor stimulation causes vasoconstriction to reduce swelling and raise blood pressure, beta-1 stimulation increases heart rate and cardiac output to improve perfusion, and beta-2 stimulation bronchodilates the airways while helping stabilize mast cells to limit further mediator release. This combination quickly improves breathing and prevents progression to shock, which is why it’s given immediately, typically by intramuscular injection in the thigh for fast absorption and reliable effect. Reassurance and subsequent therapies like diphenhydramine or glucocorticoids are supportive or adjunctive; they do not reverse the immediate dangerous effects and should not delay epinephrine. Albuterol can help if there is bronchospasm, but it does not address the underlying vasodilation and edema, so it’s used as an add-on rather than a substitute for epinephrine.

Anaphylaxis requires epinephrine as the first-line treatment because it rapidly reverses the life-threatening changes in airway, breathing, and circulation. Epinephrine hits multiple targets at once: alpha-1 receptor stimulation causes vasoconstriction to reduce swelling and raise blood pressure, beta-1 stimulation increases heart rate and cardiac output to improve perfusion, and beta-2 stimulation bronchodilates the airways while helping stabilize mast cells to limit further mediator release. This combination quickly improves breathing and prevents progression to shock, which is why it’s given immediately, typically by intramuscular injection in the thigh for fast absorption and reliable effect. Reassurance and subsequent therapies like diphenhydramine or glucocorticoids are supportive or adjunctive; they do not reverse the immediate dangerous effects and should not delay epinephrine. Albuterol can help if there is bronchospasm, but it does not address the underlying vasodilation and edema, so it’s used as an add-on rather than a substitute for epinephrine.