Hereditary angioedema: a broad review for clinicians

Area of Science:

• Immunology
• Genetics
• Rare Diseases

Background:

• Hereditary angioedema (HAE) is an autosomal dominant disorder affecting 1 in 10,000 to 150,000 individuals.
• It presents as recurrent, severe localized edema, potentially impacting skin, gastrointestinal, and respiratory systems.
• A recently identified X-linked variant, termed HAE type 3, shares identical symptoms with previously described types.

Purpose of the Study:

• To provide a comprehensive overview of Hereditary Angioedema (HAE).
• To highlight diagnostic criteria and management strategies for HAE.
• To inform clinicians about HAE in their differential diagnosis.

Main Methods:

• Review of clinical manifestations and genetic inheritance patterns of HAE.
• Discussion of diagnostic laboratory analyses, including C1 esterase inhibitor and complement components.
• Summary of current and adjunctive treatment options for acute attacks and long-term prophylaxis.

Main Results:

• HAE symptoms are consistent across all types, with potential for life-threatening airway obstruction.
• Diagnosis involves assessing C1 esterase inhibitor and complement levels.
• Effective management includes C1 esterase inhibitor concentrate for acute attacks and androgens or antifibrinolytics for prophylaxis.

Conclusions:

• HAE requires prompt recognition and specific management to prevent severe complications.
• Clinicians should consider HAE in cases of unexplained episodic angioedema or abdominal pain.
• Ongoing research into HAE variants like type 3 is essential for complete understanding and treatment.