Clinical Scorecard: Assessment of Cardiac and Hepatic Iron Levels Using MR Imaging in Patients with Hematological Cancers and Chronic Liver Conditions

At a Glance

Key Highlights

• Cardiac iron overload is a major mortality cause in thalassaemia major; less characterized in MDS and other hematological malignancies.
• MRI techniques (T2*, R2, R2*) provide reliable, non-invasive quantification of liver and cardiac iron concentrations with good reproducibility.
• Cardiac iron excess in MDS may occur primarily in patients with severe liver iron overload; chelation therapy affects iron distribution and MRI calibration.

Guideline-Based Recommendations

Diagnosis

• Use MRI-based T2* and R2/R2* measurements for quantitative assessment of cardiac and liver iron concentrations.
• Avoid invasive liver biopsy for iron quantification when MRI is available due to comparable accuracy and safety.
• Exclude patients on iron chelation therapy when interpreting MRI iron measurements due to altered calibration.

Management

• Monitor transfusion-dependent patients for iron overload using MRI to guide timely intervention.
• Consider transfusion need as an adverse prognostic factor in hematological malignancies per WHO classification.
• Evaluate iron overload in chronic liver disease patients with elevated serum ferritin and decreased liver function.

Monitoring & Follow-up

• Perform cardiac and liver MRI assessments periodically to detect iron accumulation and prevent toxic sequelae.
• Use cardiac T2* values and liver R2 calibrated to M-HIC as reference standards for monitoring iron levels.
• Monitor serum ferritin and transfused RBC units as adjunct iron indicators.

Risks

• Iron overload can lead to cardiac dysfunction and increased mortality, especially in thalassaemia major.
• Severe liver iron overload may predispose to cardiac iron deposition and increased infection risk in chronic liver disease.
• Iron chelation therapy alters iron distribution and MRI measurement accuracy.

Patient & Prescribing Data

Non-chelated patients with myelodysplastic syndrome, other hematological malignancies, and chronic liver disease

MRI-based iron quantification assists in identifying patients at risk of iron toxicity and guides transfusion and chelation strategies.

Clinical Best Practices

• Use validated MRI protocols (e.g., ECG-gated breath-hold spoiled gradient recalled echo sequences) for cardiac T2* measurement.
• Select a consistent region of interest in the left ventricular septum for cardiac iron quantification.
• Instruct patients to fast 4 hours before MRI to optimize imaging quality.
• Avoid MRI iron assessment in patients currently receiving iron chelation therapy due to altered calibration curves.
• Correlate MRI findings with clinical parameters such as transfusion history and serum ferritin for comprehensive iron overload evaluation.

References

• Andersson et al., Cardiac T2* MRI method
• WHO classification-based prognostic scoring system for MDS
• MRI calibration for liver iron concentration (M-HIC method)