Brain perfusion changes in beta-thalassemia

Area of Science:

• Neurology
• Hematology
• Medical Imaging

Background:

• Hereditary hemoglobinopathies like beta-thalassemia can cause brain injury, often linked to anemia-induced hypoperfusion.
• Vulnerable brain areas include supratentorial and infratentorial vascular watershed regions, though data are limited.

Purpose of the Study:

• To investigate regional brain perfusion changes in beta-thalassemia using arterial spin labeling.
• To correlate these perfusion changes with clinical phenotype and anemia severity.

Main Methods:

• A multicenter, cross-sectional 3T-MRI study involving 54 transfusion-dependent thalassemia (TDT) patients, 23 non-transfusion-dependent thalassemia (NTDT) patients, and 56 healthy controls (HC).
• Non-invasive brain perfusion analysis using arterial spin labeling, with recording of age, hemoglobin levels, and cognitive function.

Main Results:

• Both TDT and NTDT patients showed globally increased brain perfusion compared to HC.
• Beta-thalassemia patients displayed relative hyperperfusion in watershed regions, correlating with hemoglobin levels (p=0.013).
• Decreased white matter density was observed in hyperperfused regions, inversely correlating with cognitive function in NTDT patients.

Conclusions:

• Relative hyperperfusion in watershed territories is a key hemodynamic feature of beta-thalassemia anemia.
• Anemia management is crucial for preventing white matter changes and potential long-term cognitive impairment.