A 33-year-old woman develops a pruritic rash on her neck and chest within 30 minutes of eating at a seafood buffet. Which finding would indicate the need for prompt intramuscular epinephrine?

• A. Pruritus only
• B. Wheezing
• C. Localized rash
• D. Mild facial flushing

Answer: (B)

The main idea here is recognizing when a food allergy has progressed to a systemic reaction with airway involvement. Wheezing shows bronchospasm from mediator release during an anaphylactic reaction, which can rapidly worsen and endanger breathing and circulation. In this situation, intramuscular epinephrine is the first-line, life-saving treatment because it rapidly relaxes airway smooth muscle and constricts blood vessels to reduce leakage and edema, improving both breathing and blood pressure.

Pruritus alone, a localized rash, or mild facial flushing can occur with allergic reactions that don’t involve the airways or cause hemodynamic instability, so they don’t by themselves necessitate urgent epinephrine. The presence of wheezing signals the need for prompt epinephrine administration.