Beta-thalassemia major: thin-section CT features and correlation with pulmonary function and iron overload.

Area of Science:

• Pulmonary Medicine
• Radiology
• Hematology

Background:

• Beta-thalassemia major (beta-TM) is a severe inherited blood disorder requiring lifelong transfusions.
• Pulmonary complications, including lung disease, can significantly impact the quality of life and prognosis of beta-TM patients.
• Thin-section computed tomography (CT) is a valuable imaging technique for assessing lung abnormalities.

Purpose of the Study:

• To characterize and quantify lung abnormalities using thin-section CT in beta-TM patients.
• To investigate the relationship between CT findings, pulmonary function test (PFT) results, and iron overload.
• To determine the prevalence of air trapping in beta-TM patients.

Main Methods:

• Forty-one beta-TM patients underwent thin-section CT (inspiration and expiration) and PFTs.
• Radiologists assessed CT scans for bronchial and parenchymal abnormalities and air trapping.
• Air trapping was quantified using a semiquantitative score (ATS), and its association with PFTs and liver iron overload (via MRI signal intensity ratio) was analyzed.

Main Results:

• Air trapping was observed in 24% of beta-TM patients, with no evidence of interstitial lung disease on CT.
• A restrictive spirometric pattern was present in 27% of patients.
• Air trapping score (ATS) correlated significantly with several PFT parameters, particularly mid-expiratory flow rate (FEF25%-75%), but not with hepatic iron overload.

Conclusions:

• Expiratory thin-section CT can detect air trapping in beta-TM patients.
• Air trapping is associated with reduced forced expiratory flow rates, specifically FEF25%-75%.
• Hepatic iron overload does not appear to be directly associated with air trapping in this cohort.