CRDTS Local Anesthesia Practice Test

In systemic anaphylaxis, the immediate, life-saving intervention is epinephrine. It acts on multiple receptors to reverse the dangerous changes that occur during a severe allergic reaction: alpha-1–mediated vasoconstriction raises blood pressure and reduces swelling in the airways and tissues, while beta-2–mediated bronchodilation eases airway constriction and decreases mast cell mediator release. This rapid, broad action stabilizes breathing and circulation, addressing the two most threatening problems in anaphylaxis. Because of this, epinephrine should be given promptly, with a repeat dose if symptoms persist and emergency services contacted. Other options are not sufficient for the acute management. Antihistamines may help with itching or hives but do not relieve airway obstruction or hypotension quickly enough. Corticosteroids uptake is delayed and does not treat the immediate life-threatening symptoms. Simply observing and waiting risks progression to fatal airway compromise or shock. After epinephrine, provide supportive care such as oxygen, IV fluids if hypotensive, and airway monitoring, with continued observation for potential biphasic reactions.