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- Title
Iron overload in Brazilian thalassemic patients.
- Authors
de Assis, Reijane Alves; Kay, Fernando Uliana; Rosemberg, Laércio Alberto; Parma, Alexandre Henrique C.; Nomura, Cesar Higa; Loggetto, Sandra Regina; Araujo, Aderson da Silva; Fabron Junior, Antonio; de Almeida Veríssimo, Mônica Pinheiro; Baldanzi, Giorgio Roberto; Steagal, Merula A.; Di Sessa Velloso, Claudia Angela Galleni; Espósito, Breno Pannia; Nakashima, Sandra Saemi; Diniz, Michelli da Silva; Tricta, Fernando; Baroni, Ronaldo Hueb; de Gusmão Funari, Marcelo Buarque; Wood, John C.; Ribeiro, Andreza Alice Feitosa
- Abstract
Objectives: To evaluate the use of magnetic resonance imaging in patients with β-thalassemia and to compare T2* magnetic resonance imaging results with serum ferritin levels and the redox active fraction of labile plasma iron. Methods: We have retrospectively evaluated 115 chronically transfused patients (65 women). We tested serum ferritin with chemiluminescence, fraction of labile plasma iron by cellular fluorescence and used T2* MRI to assess iron content in the heart, liver, and pancreas. Hepatic iron concentration was determined in liver biopsies of 11 patients and the results were compared with liver T2* magnetic resonance imaging. Results: The mean serum ferritin was 2,676.5 +/- 2,051.7 ng/mL. A fraction of labile plasma iron was abnormal (> 0,6 Units/mL) in 48/83 patients (57%). The mean liver T2* value was 3.91 ± 3.95 ms, suggesting liver siderosis in most patients (92.1%). The mean myocardial T2* value was 24.96 ± 14.17 ms and the incidence of cardiac siderosis (T2* < 20 ms) was 36%, of which 19% (22/115) were severe cases (T2* < 10 ms). The mean pancreas T2* value was 11.12 ± 11.20 ms, and 83.5% of patients had pancreatic iron deposition (T2* < 21 ms). There was significant curvilinear and inverse correlation between liver T2* magnetic resonance imaging and hepatic iron concentration (r= -0.878; p < 0.001) and moderate correlation between pancreas and myocardial T2* MRI (r = 0.546; p < 0.0001). Conclusion: A high rate of hepatic, pancreatic and cardiac impairment by iron overload was demonstrated. Ferritin levels could not predict liver, heart or pancreas iron overload as measured by T2* magnetic resonance imaging. There was no correlation between liver, pancreas, liver and myocardial iron overload, neither between ferritin and fraction of labile plasma iron with liver, heart and pancreas T2* values
- Subjects
BLOOD diseases; MAGNETIC resonance imaging; FERRITIN; CHEMILUMINESCENCE; IRON in the body; MEDICAL imaging systems
- Publication
Einstein (16794508), 2011, Vol 9, Issue 2, p165
- ISSN
1679-4508
- Publication type
Article
- DOI
10.1590/s1679-45082011ao1897