Iron overload in Brazilian thalassemic patients

Area of Science:

• Hematology
• Radiology
• Cardiology

Background:

• Beta-thalassemia patients require chronic blood transfusions, leading to iron overload.
• Iron overload can cause severe damage to vital organs, including the heart, liver, and pancreas.
• Accurate assessment of organ iron levels is crucial for managing complications.

Purpose of the Study:

• To evaluate the utility of T2* magnetic resonance imaging (MRI) for assessing iron content in the heart, liver, and pancreas of beta-thalassemia patients.
• To compare T2* MRI findings with serum ferritin levels and the fraction of labile plasma iron.
• To determine the correlation between organ iron deposition and established biomarkers.

Main Methods:

• Retrospective evaluation of 115 chronically transfused beta-thalassemia patients.
• Measurement of serum ferritin and labile plasma iron.
• Assessment of iron content in the heart, liver, and pancreas using T2* MRI.
• Correlation of T2* MRI values with liver biopsy-confirmed hepatic iron concentration in a subset of patients.

Main Results:

• High prevalence of iron overload detected in the liver (92.1%), pancreas (83.5%), and heart (36%) via T2* MRI.
• Significant inverse correlation found between liver T2* MRI and hepatic iron concentration (r = -0.878, p < 0.001).
• Serum ferritin and labile plasma iron levels did not correlate with organ iron levels measured by T2* MRI, indicating their inadequacy as predictive markers.

Conclusions:

• T2* MRI is an effective tool for quantifying iron overload in the heart, liver, and pancreas of beta-thalassemia patients.
• Standard biomarkers like serum ferritin and labile plasma iron are unreliable for assessing organ-specific iron burden.
• Early detection and monitoring of iron overload using T2* MRI are essential for preventing organ damage in beta-thalassemia.