If someone experiences rhinorrhea, laryngeal edema, and systemic vasodilation after exposure to an environmental substance, which type of hypersensitivity reaction is MOST likely o... If someone experiences rhinorrhea, laryngeal edema, and systemic vasodilation after exposure to an environmental substance, which type of hypersensitivity reaction is MOST likely occurring?
Understand the Problem
The question describes a scenario with symptoms (rhinorrhea, laryngeal edema, systemic vasodilation) occurring after exposure to an environmental substance. It asks us to identify the most likely type of hypersensitivity reaction responsible for these symptoms. The key is to recognize which type of hypersensitivity typically presents with rapid onset and systemic effects like those described.
Answer
Type I hypersensitivity is the most likely reaction due to the presented symptoms.
The most likely type of hypersensitivity reaction is Type I. This is due to the rapid onset and symptoms such as rhinorrhea (runny nose), laryngeal edema (swelling of the larynx), and systemic vasodilation (widening of blood vessels), which are characteristic of Type I hypersensitivity reactions, including anaphylaxis.
Answer for screen readers
The most likely type of hypersensitivity reaction is Type I. This is due to the rapid onset and symptoms such as rhinorrhea (runny nose), laryngeal edema (swelling of the larynx), and systemic vasodilation (widening of blood vessels), which are characteristic of Type I hypersensitivity reactions, including anaphylaxis.
More Information
Type I hypersensitivity reactions are immediate, typically occurring within minutes to an hour after exposure to an antigen. These reactions are mediated by IgE antibodies and mast cells, leading to the release of inflammatory mediators. Systemic vasodilation can lead to anaphylactic shock, a severe and potentially life-threatening condition.
Tips
It's important to consider the timing of the reaction and the specific symptoms when determining the type of hypersensitivity. While other types exist, the rapid onset and symptoms listed are most indicative of Type I.
Sources
- Type I Hypersensitivity Reaction - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Immediate Hypersensitivity Reactions - Medscape Reference - emedicine.medscape.com
- Anaphylaxis - Lockey R (Updated 2019) - World Allergy Organization - worldallergy.org
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