Medical Emergencies · single question
What is usually the FIRST sign of a Type I hypersensitivity (anaphylactic) reaction?
Show answer and explanation
Correct answer: A. Hives (urticaria)
- A. Correct. Cutaneous signs — urticaria, flushing, pruritus — are typically the earliest manifestations of Type I hypersensitivity.
- B. Bronchospasm is a later, more dangerous airway sign.
- C. Hypotension reflects progression to anaphylactic shock, occurring after early skin signs.
- D. Tachycardia accompanies the cardiovascular response but is not the first recognizable sign.
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