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C1-inhibitor deficiency and angioedema
A Carugati1, E Pappalardo, L C Zingale
1Department of Internal Medicine, University of Milan, IRCCS Ospedale Maggiore, Via Pace 9, 20122 Milan, Italy.
Molecular Immunology
|September 5, 2001
Summary
C1-inhibitor deficiency, both hereditary and acquired, causes life-threatening angioedema. Misdiagnosis is common, but effective therapies exist for C1-inhibitor deficiency, preventing severe attacks.
Area of Science:
- Immunology
- Genetics
- Pathophysiology
Background:
- C1-inhibitor (C1-Inh) deficiency, inherited or acquired, causes recurrent angioedema, potentially life-threatening when laryngeal.
- Hereditary angioedema (HAE) results from heterozygous C1-Inh gene deficiency (autosomal dominant); mutations affect C1-Inh transcription, translation, or secretion.
- Acquired angioedema (AAE) involves accelerated C1-Inh consumption via autoantibodies or associated diseases like lymphoproliferative disorders.
Purpose of the Study:
- To review the pathophysiology, diagnosis, and treatment of C1-inhibitor deficiency.
- To highlight the challenges in diagnosing C1-inhibitor deficiency due to its misattribution as allergic angioedema.
- To discuss current therapeutic strategies for HAE and AAE.
Main Methods:
- Literature review of C1-inhibitor deficiency, HAE, and AAE.
- Analysis of genetic defects in HAE and mechanisms of C1-Inh consumption in AAE.
- Summary of clinical presentation, diagnostic pitfalls, and treatment outcomes.
Main Results:
- HAE involves diverse genetic mutations, with 15% of patients having non-functional C1-Inh (HAE type II).
- AAE is driven by autoantibodies or consumption linked to other diseases.
- Misdiagnosis of C1-inhibitor deficiency as allergic angioedema is a significant barrier to timely treatment.
Conclusions:
- Effective therapies exist for C1-inhibitor deficiency, including attenuated androgens (HAE), antifibrinolytics (AAE), and C1-Inh plasma concentrate for acute attacks.
- Prompt diagnosis and appropriate treatment are crucial to prevent severe or lethal angioedema attacks.
- C1-Inh plasma concentrate is effective for laryngeal and abdominal attacks in both HAE and AAE, with potential need for high doses in autoantibody-mediated AAE.