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Alpha-1 antitrypsin deficiency and computed tomography findings
Michelle A McMahon1, Michael J O'Mahony, Shane J O'Neill
1Department of Radiology, Beaumont Hospital, Dublin 9, Ireland.
Journal of Computer Assisted Tomography
|July 14, 2005
Summary
Alpha-1 antitrypsin deficiency patients with the ZZ phenotype commonly show upper lobe bronchiectasis and moderate emphysema. Other phenotypes (SZ, MZ) showed no bronchiectasis in this study.
Area of Science:
- Pulmonary Medicine
- Genetics
Background:
- Alpha-1 antitrypsin deficiency (AATD) is a genetic disorder that can lead to lung disease.
- Bronchiectasis and emphysema are common complications, but their severity and correlation with specific AATD phenotypes require further investigation.
Purpose of the Study:
- To assess the severity of bronchiectasis and emphysema in patients with AATD.
- To explore the relationship between these lung conditions and different AATD phenotypes (ZZ, SZ, MZ).
Main Methods:
- Modified Ooi scoring system used for bronchiectasis and emphysema assessment.
- High-resolution computed tomography (HRCT) thorax scans of 26 AATD patients analyzed.
- Scoring on a 0-3 scale for bronchial dilatation, emphysema, and affected segments.
Main Results:
- Bronchiectasis was present in 38% of assessed lobes, predominantly in upper lobes.
- The ZZ phenotype was associated with bronchiectasis and moderate emphysema in all lobes.
- Patients with SZ and MZ phenotypes did not exhibit bronchiectasis in this cohort.
Conclusions:
- The ZZ phenotype of AATD is linked to upper lobe bronchiectasis and diffuse moderate emphysema.
- Limited data on SZ and MZ phenotypes prevent definitive conclusions, but no bronchiectasis was observed.