Cardiac iron overload in transfusion-dependent patients with myelodysplastic syndromes

Area of Science:

• Hematology
• Radiology
• Medical Imaging

Background:

• Patients with transfusion-dependent myelodysplastic syndromes (MDS) are at high risk of developing iron overload.
• Chronic blood transfusions, a common treatment for MDS, lead to excessive iron accumulation.
• Iron overload can cause significant organ damage, particularly in the liver and heart.

Purpose of the Study:

• To assess the prevalence and predictors of iron overload in transfusion-dependent MDS patients.
• To evaluate the utility of T2* magnetic resonance imaging (MRI) in quantifying iron levels in the liver and heart.
• To investigate the correlation between iron overload, transfusion history, ferritin levels, and specific genetic factors.

Main Methods:

• A cohort of 43 transfusion-dependent MDS patients underwent T2* MRI scans.
• Liver and cardiac iron concentrations were assessed using R2* values derived from T2* MRI.
• Statistical analyses were performed to correlate R2* values with transfusion units, ferritin levels, and genetic polymorphisms (HFE, HFE2, HAMP, SLC40A1).

Main Results:

• 81% of patients exhibited liver iron overload, while 16.8% had cardiac iron overload.
• Liver R2* values significantly correlated with the number of transfused units (r=0.72, P<0.0001) and serum ferritin levels (r=0.53, P<0.0001).
• Cardiac iron loading was associated with a significantly higher area under the curve of a time-ferritin plot (median 53.7x10^5 vs. 12.2x10^5 Megaunits, P=0.002).
• No significant association was found between HFE, HFE2, HAMP, or SLC40A1 genotypes and the presence of iron overload.

Conclusions:

• T2* MRI is effective in detecting and quantifying liver and cardiac iron overload in MDS patients.
• Liver iron accumulation is directly related to transfusion burden and ferritin levels.
• While cardiac iron loading is a concern, genetic factors studied did not predict iron overload in this cohort.