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Ultrastructural pathology of the heart in patients with beta-thalassaemia major
K Kyriacou1, Y Michaelides, R Senkus
1Department of Electron Microscopy and Molecular Pathology, Cyprus Institute of Neurology and Genetics (CING), Nicosia. kyriacos@mdrtc.cing.ac.cy
Insights
Beta-thalassaemia major patients with heart failure show iron overload in cardiac cells. Ultrastructural analysis reveals iron deposits (siderosomes) in heart muscle cells, causing damage.
Area of Science:
- Cardiology
- Hematology
- Pathology
Background:
- Beta-thalassaemia major often causes iron overload (hypersiderosis) affecting vital organs like the heart.
- Cardiac pathology in beta-thalassaemia major remains poorly understood at the ultrastructural level.
Purpose of the Study:
- To investigate the ultrastructural cardiac pathology in patients with beta-thalassaemia major and heart failure.
Main Methods:
- Cardiac biopsies from five Cypriot patients with beta-thalassaemia major, elevated ferritin, and heart failure were analyzed.
- Techniques included light microscopy, electron microscopy, and X-ray microanalysis.
Main Results:
- Electron microscopy revealed disrupted myocytes with myofiber loss, dense nuclei, and pleomorphic electron-dense granules (siderosomes).
- X-ray microanalysis confirmed these granules contained iron particles, indicating significant iron deposition within cardiac cells.
Conclusions:
- The observed ultrastructural changes in heart muscle cells of beta-thalassaemia major patients are likely caused by iron deposition.
- This study provides crucial ultrastructural insights into cardiac iron overload in beta-thalassaemia major.
Abstract:
Patients with beta-thalassaemia major frequently suffer from hypersiderosis which leads to hemochromatosis of major organs such as the heart and liver. Little information exists about the ultrastructural pathology of the human heart in beta-thalassaemia patients. Five Cypriot patients with elevated blood ferritin and intractable heart failure were investigated. Cardiac biopsies from these patients were studied by light and electron microscopy, as well as by X-ray microanalysis. Ultrastructural examination revealed the presence of disrupted myocytes showing loss of myofibers, dense nuclei, and a variable number of pleomorphic electron dense granules. These cytoplasmic granules or siderosomes consisted of iron-containing particles as confirmed by X-ray microanalysis. It is likely that the ultrastructural changes observed in myocytes of patients with beta-thalassaemia are largely due to iron deposition.