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Pathophysiology of hereditary angioedema
Bruce L Zuraw1, Sandra C Christiansen
1Department of Medicine, University of California, San Diego, and San Diego Veteran's Affairs Medical Center, La Jolla, California, USA. bzuraw@ucsd.edu
American Journal of Rhinology & Allergy
|December 22, 2011
Summary
Laryngeal angioedema, often bradykinin-mediated, requires prompt recognition and distinct treatment. Understanding hereditary and acquired angioedema types is crucial for effective management and improved patient outcomes.
Area of Science:
- Immunology
- Genetics
- Pharmacology
Background:
- Laryngeal angioedema poses significant risks, necessitating expertise from allergists and otolaryngologists.
- This study focuses on the clinical aspects and underlying mechanisms of bradykinin-mediated angioedema.
Purpose of the Study:
- To describe the clinical characteristics of bradykinin-mediated angioedema.
- To elucidate the pathophysiology of various angioedema subtypes.
- To inform diagnosis and treatment strategies for laryngeal angioedema.
Main Methods:
- Conducted a literature review on hereditary angioedema (HAE) types I, II, and III.
- Reviewed acquired C1 inhibitor deficiency and ACE inhibitor-associated angioedema.
- Focused on clinical characteristics and pathophysiology.
Main Results:
- Type I/II HAE diagnosis relies on clinical suspicion; SERPING1 gene mutations affect C1 inhibitor levels and activate the plasma contact system, generating bradykinin.
- Type III HAE lacks definitive diagnostic criteria, though some cases involve factor XII gene mutations.
- Acquired C1 inhibitor deficiency presents similarly to HAE but sporadically in older adults due to C1 inhibitor consumption.
- ACE inhibitor-associated angioedema is linked to increased bradykinin from ACE inhibition, enhancing vascular permeability.
Conclusions:
- Laryngeal angioedema is common in bradykinin-mediated conditions.
- New effective treatments for bradykinin-mediated angioedema are emerging.
- Accurate differentiation of bradykinin-mediated from histamine-mediated angioedema is vital for appropriate clinical management.
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