Quiz-summary
0 of 1 questions completed
Questions:
- 1
Information
USMLE Step 1 Questions
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
Time has elapsed
You have reached 0 of 0 points, (0)
Categories
- Immunology 0%
-
Question:
A 24-year-old man with no past medical history develops urticaria and angioedema within 2 hours of taking aspirin for a headache. It is the first time he has taken aspirin in years, but he does not recall having an adverse reaction to it in the past. What kind of hypersensitivity reaction does this represent?
Correct Answer: D. IgE-mediated
This represents an IgE-mediated (also called anaphylactic or type I) hypersensitivity reaction, where mast cells release histamine and other substances that result in vasodilation and increased vascular permeability, resulting in urticaria (hives) and angioedema (the same mechanism as urticaria, but affecting subcutaneous tissue).
- 1
- Answered
- Review
-
Question 1 of 1
1. Question
Category: ImmunologyA 24-year-old man with no past medical history develops urticaria and angioedema within 2 hours of taking aspirin for a headache. It is the first time he has taken aspirin in years, but he does not recall having an adverse reaction to it in the past. What kind of hypersensitivity reaction does this represent?
Correct
Incorrect
