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Primary Humoral Immunodeficiencies and Bronchiectasis in Adults
Guillermo Suárez-Cuartín1,2, Carmen Lores1, Jose Daniel Gomez-Olivas2,3
1Pneumology Department, Bellvitge University Hospital, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, 08907 Barcelona, Spain.
Primary humoral immunodeficiencies increase bronchiectasis risk via recurrent infections. Identifying these immunoglobulin defects is crucial for timely, treatable interventions in patients with respiratory issues.
Area of Science:
- Immunology
- Pulmonology
- Genetics
Background:
- Primary humoral immunodeficiencies (PHIDs) involve immunoglobulin defects, often leading to recurrent respiratory infections and bronchiectasis.
- The prevalence of bronchiectasis varies among specific PHIDs, with common variable immunodeficiency (CVID) being frequently associated.
Purpose of the Study:
- To review the association between various primary humoral immunodeficiencies and bronchiectasis.
- To highlight the clinical importance of identifying immunoglobulin defects in patients with unexplained bronchiectasis.
Main Methods:
- Literature review and synthesis of existing data on PHIDs and bronchiectasis.
- Analysis of guideline recommendations for diagnosing immunoglobulin defects in bronchiectasis patients.
Main Results:
- Selective Immunoglobulin A (IgA) deficiency and IgG2 subclass deficiency are common, but CVID has the strongest link to bronchiectasis.
- The role of isolated IgA or selective IgG subclass deficiencies in bronchiectasis is debated.
- Other PHIDs like X-linked agammaglobulinemia and rarer deficiencies are also associated.
Conclusions:
- Current guidelines recommend screening for immunoglobulin defects in patients with compatible features or recurrent infections.
- Identifying these defects is vital as they represent treatable conditions.
- Further research, including registries and emerging therapies, is needed to clarify the role of PHIDs in bronchiectasis.
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