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Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload
Published on: March 14, 2017
Link between Genotype and Multi-Organ Iron and Complications in Children with Transfusion-Dependent Thalassemia
Antonella Meloni1,2, Laura Pistoia1, Paolo Ricchi3
1Department of Radiology, Fondazione G. Monasterio CNR-Regione Toscana, 56124 Pisa, Italy.
Insights
In children with transfusion-dependent beta-thalassemia, the specific genotype influences iron buildup in the heart and pancreas. Understanding genotype helps predict iron overload and manage patient care.
Area of Science:
- Hematology
- Genetics
- Pediatric Medicine
Background:
- Transfusion-dependent beta-thalassemia (β-TDT) is a genetic blood disorder requiring frequent blood transfusions.
- Iron overload is a major complication of chronic transfusions, affecting vital organs like the heart and pancreas.
- The impact of different β-thalassemia genotypes on iron accumulation and organ complications in children is not fully understood.
Purpose of the Study:
- To investigate the association between β-thalassemia genotype and iron content in the liver, pancreas, and myocardium.
- To evaluate the impact of genotype on hepatic, cardiac, and endocrine complications in pediatric β-TDT patients.
- To determine if genotype can predict specific phenotypic features and aid in clinical management.
Main Methods:
- Studied 68 pediatric β-TDT patients, categorized into homozygous β+, compound heterozygous β0β+, and homozygous β0 genotypes.
- Quantified iron overload using cardiac T2* magnetic resonance imaging.
- Assessed biventricular function and myocardial fibrosis using cine and late gadolinium enhancement imaging.
Main Results:
- Homozygous β0 genotype was associated with significantly lower heart and pancreas T2* values compared to the homozygous β+ genotype.
- Patients with β0β+ and β0β0 genotypes had a higher likelihood of pancreatic iron overload than those with homozygous β+ genotype.
- No significant differences were found in biventricular function, myocardial fibrosis, or the frequency of major complications like cirrhosis, diabetes, or heart failure across genotypes.
Conclusions:
- In pediatric β-TDT patients, genotype significantly correlates with cardiac and pancreatic iron overload.
- Genotype knowledge is valuable for predicting iron overload patterns and guiding clinical management strategies.
- While major organ damage was not observed in this cohort, genotype-specific iron accumulation highlights the need for tailored monitoring.
Abstract:
We evaluated the impact of the genotype on hepatic, pancreatic and myocardial iron content, and on hepatic, cardiac and endocrine complications in children with transfusion-dependent β-thalassemia (β-TDT). We considered 68 β-TDT patients (11.98 ± 3.67 years, 51.5% females) consecutively enrolled in the Extension-Myocardial Iron Overload in Thalassemia network. Iron overload was quantified by T2* technique and biventricular function by cine images. Replacement myocardial fibrosis was evaluated by late gadolinium enhancement technique. Three groups of patients were identified: homozygous β+ (N = 19), compound heterozygous β0β+ (N = 24), and homozygous β0 (N = 25). The homozygous β0 group showed significantly lower global heart and pancreas T2* values than the homozygous β+ group. Compared to patients with homozygous β+ genotype, β0β+ as well as β0β0 patients were more likely to have pancreatic iron overload (odds ratio = 6.53 and 10.08, respectively). No difference was detected in biventricular function parameters and frequency of replacement fibrosis. No patient had cirrhosis/fibrosis, diabetes or heart failure, and the frequency of endocrinopathies was comparable among the groups. In pediatric β-TDT patients, there is an association between genotype and cardiac and pancreatic iron overload. The knowledge of patients' genotype can be valuable in predicting some patients' phenotypic features and in helping the clinical management of β-TDT patients.
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