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Pancreatic iron loading predicts cardiac iron loading in thalassemia major
Leila J Noetzli1, Jhansi Papudesi, Thomas D Coates
1Division of Cardiology, Department of Pediatrics, Childrens Hospital Los Angeles, Los Angeles, CA 90027, USA.
Insights
Pancreatic iron buildup in thalassemia major patients often precedes heart iron, indicating a risk for cardiac complications. Monitoring pancreatic iron offers early detection for managing iron overload and preventing heart disease.
Area of Science:
- Hematology
- Cardiology
- Radiology
Background:
- Chronic transfusions in thalassemia major patients lead to iron overload.
- Diabetes mellitus and cardiomyopathy are frequent complications in these patients.
- Iron deposition in organs like the pancreas and heart contributes to morbidity.
Purpose of the Study:
- To investigate if pancreatic iron deposition precedes cardiac iron loading in thalassemia major.
- To establish the relationship between pancreatic and cardiac iron levels.
- To assess the predictive value of pancreatic iron for cardiac iron accumulation.
Main Methods:
- A 4-year longitudinal study of 131 thalassemia major patients.
- Quantification of pancreatic and cardiac iron using magnetic resonance imaging (MRI) R2* values.
- Correlation analysis between pancreatic, cardiac, and liver iron levels.
Main Results:
- Pancreatic iron (80.4%) was more prevalent than cardiac iron (37.7%).
- Pancreatic iron accumulation occurred approximately a decade earlier than cardiac iron.
- Pancreatic R2* values strongly predicted the presence and severity of cardiac iron.
- Changes in pancreatic iron correlated with cardiac iron changes, but not liver iron.
Conclusions:
- Pancreatic iron measurement is a valuable early indicator of conditions predisposing to cardiac iron deposition.
- Monitoring pancreatic iron provides complementary information to liver and cardiac iron assessments during chelation therapy.
- Staged MRI examinations of the abdomen and heart can optimize patient management and reduce healthcare costs.
Abstract:
Diabetes mellitus and cardiomyopathy are common in chronically transfused thalassemia major patients, occurring in the second and third decades of life. We postulated that pancreatic iron deposition would precede cardiac iron loading, representing an environment favorable for extrahepatic iron deposition. To test this hypothesis, we examined pancreatic and cardiac iron in 131 thalassemia major patients over a 4-year period. Cardiac iron (R2* > 50 Hz) was detected in 37.7% of patients and pancreatic iron (R2* > 28 Hz) in 80.4% of patients. Pancreatic and cardiac R2* were correlated (r(2) = 0.52), with significant pancreatic iron occurring nearly a decade earlier than cardiac iron. A pancreatic R2* less than 100 Hz was a powerful negative predictor of cardiac iron, and pancreatic R2* more than 100 Hz had a positive predictive value of more than 60%. In serial analysis, changes in cardiac iron were correlated with changes in pancreatic iron (r(2) = 0.33, P < .001), but not liver iron (r(2) = 0.025, P = .25). As a result, pancreatic R2* measurements offer important early recognition of physiologic conditions suitable for future cardiac iron deposition and complementary information to liver and cardiac iron during chelation therapy. Staging abdominal and cardiac magnetic resonance imaging examinations could significantly reduce costs, magnet time, and need for sedation in young patients.
