A patient develops urticaria after receiving radiocontrast dye. Which mediator is primarily released during this reaction?
Show answer and explanation
Correct answer: Histamine
Histamine is released from mast cells during IgE-mediated Type I hypersensitivity reactions. It causes vasodilation and itching.
Keep practicing
More Hypersensitivity and Autoimmunity questions
- A patient with celiac disease develops intestinal damage due to T-cell activation against gluten peptides. Which hypersensitivity type is t…
- A patient with Goodpasture syndrome produces autoantibodies attacking basement membranes. What type of hypersensitivity reaction is involve…
- A patient develops hives, bronchospasm, and hypotension minutes after eating peanuts. Which hypersensitivity reaction is this?
- A newborn develops hemolytic disease of the newborn due to maternal anti-Rh antibodies. Which hypersensitivity mechanism is responsible?
- A patient with systemic lupus erythematosus develops glomerulonephritis due to circulating immune complexes. This reflects which hypersensi…
- A patient undergoes a PPD skin test. After 48 hours, a firm erythematous induration appears. Which hypersensitivity type is this?