Advanced Cardiovascular Life Support (ACLS) Practice Exam 2026 – Your Comprehensive All-in-One Guide to Exam Success!

In the context of an allergic reaction during a cardiac event, the administration of adrenaline (epinephrine) is critical and serves as the first-line drug. Adrenaline acts on both alpha and beta-adrenergic receptors, providing multiple beneficial effects in managing severe allergic reactions, particularly anaphylaxis. It helps to counteract the severe vasodilation and increased vascular permeability associated with allergic responses, which can lead to hypotension and shock. By promoting vasoconstriction and improving cardiac output, adrenaline stabilizes vital signs and can swiftly alleviate respiratory distress by bronchodilation.

Other options, such as atropine, dopamine, and aspirin, have their respective uses in cardiovascular management but do not directly address the immediate life-threatening effects of severe allergic reactions. Atropine is primarily indicated for bradycardia; dopamine is used for hypotension, particularly in cardiogenic shock; and aspirin is utilized for its antiplatelet effects in acute coronary events but does not treat allergic reactions. Thus, the prompt use of adrenaline is essential in effectively managing the acute and potentially life-threatening aspects of an allergic reaction during a cardiac event.