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Published on: October 14, 2014
Mediator release in local heat urticaria
The Journal of Allergy and Clinical Immunology
|October 1, 1981
Summary
Local heat urticaria, a rare physical urticaria, causes skin reactions like redness and swelling upon heat exposure. This case study details a patient experiencing these symptoms due to hot water and environmental heat.
Area of Science:
- Dermatology
- Immunology
- Allergy
Background:
- Physical urticarias are hypersensitivity reactions to physical stimuli.
- Local heat urticaria is a rare subtype, presenting with localized hives upon heat exposure.
Observation:
- A 59-year-old woman presented with erythema and angioedema after contact with hot water and heat.
- Symptoms were sharply demarcated at the site of heat exposure.
- Immediate increases in histamine and neutrophil chemotactic activity were observed in blood draining the affected area.
Findings:
- The patient's reaction mimicked other physical urticarias like cold and cholinergic urticaria.
- Histamine release and neutrophil recruitment are key components of the inflammatory response.
Implications:
- This case supports the hypothesis that local heat urticaria involves mast cell degranulation.
- Understanding the pathophysiology aids in diagnosing and managing this rare condition.
- Further research into physical urticarias can reveal broader mechanisms of mast cell-mediated inflammation.
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