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Alpha-1 antitrypsin deficiency: an update on clinical aspects of diagnosis and management
Gabriela Santos1, Alice M Turner2
1Pneumology Department, Hospital Garcia de Orta, Almada, Portugal.
Insights
Alpha-1 antitrypsin deficiency (AATD) shows clinical variability. Research highlights diagnosis and management strategies, particularly for milder genotypes like PiSZ and PiMZ, often influenced by lifestyle factors.
Area of Science:
- Pulmonology
- Genetics
- Internal Medicine
Background:
- Alpha-1 antitrypsin deficiency (AATD) exhibits significant clinical heterogeneity.
- The PiZZ genotype is the most severe and researched form, but milder genotypes (PiSZ, PiMZ) also contribute to lung and liver disease, especially with unhealthy behaviors.
- Clinical suspicion is crucial for diagnosing AATD.
Purpose of the Study:
- To summarize recent key findings (last 5-10 years) in the diagnosis, assessment, and management of AATD.
- To focus on the nuances of managing milder AATD deficiency variants.
- To review current and emerging monitoring and therapeutic strategies.
Main Methods:
- Review of recent scientific literature on AATD diagnosis, assessment, and management.
- Analysis of findings related to different AATD genotypes, including PiZZ, PiSZ, and PiMZ.
- Evaluation of diagnostic tools like lung function tests and CT densitometry.
Main Results:
- Milder AATD genotypes (PiSZ, PiMZ) are associated with disease, particularly when combined with smoking or alcohol use.
- Intravenous augmentation therapy is effective for PiZZ patients but its benefit in milder deficiency is less clear.
- AATD may increase susceptibility to pulmonary infections.
Conclusions:
- Effective management of AATD requires considering clinical heterogeneity and genotype-specific risks.
- Further research is needed on biological markers for monitoring and therapy selection, especially for milder AATD.
- Lifestyle modifications are important adjuncts in managing AATD patients with milder genotypes.
Abstract:
Clinical heterogeneity has been demonstrated in alpha-1 antitrypsin deficiency (AATD), such that clinical suspicion plays an important role in its diagnosis. The PiZZ genotype is the most common severe deficiency genotype and so tends to result in the worst clinical presentation, hence it has been the major focus of research. However, milder genotypes, especially PiSZ and PiMZ, are also linked to the development of lung and liver disease, mainly when unhealthy behaviors are present, such as smoking and alcohol use. Monitoring and managing AATD patients remains an area of active research. Lung function tests or computed tomography (CT) densitometry may allow physicians to identify progressive disease during follow up of patients, with a view to decision making about AATD-specific therapy, like augmentation therapy, or eventually surgical procedures such as lung volume reduction or transplant. Different types of biological markers have been suggested for disease monitoring and therapy selection, although most need further investigation. Intravenous augmentation therapy reduces the progression of emphysema in PiZZ patients and is available in many European countries, but its effect in milder deficiency is less certain. AATD has also been suggested to represent a risk factor and trigger for pulmonary infections, like those induced by mycobacteria. We summarize the last 5-10 years' key findings in AATD diagnosis, assessment, and management, with a focus on milder deficiency variants.
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