Only limited data are available regarding myocardial iron overload in adult patients with transfusion dependent acquired anemias. To address this topic using MRI T2* we studied 27 consecutive chronic transfusion dependent patients with acquired anemias: (22 myelodysplastic syndrome, 5 primary myelofibrosis). Cardiac MRI T2* values obtained ranged from 5.6 to 58.7 (median value 39.8) milliseconds. Of the 24 analyzable patients, cardiac T2* correlated with transfusion burden (p=0.0002). No patient who had received less than 290 mL/kg of packed red blood cells (101 units=20 grams of iron) had a pathological cardiac T2* value (< 20 ms). All patients who had received at least 24 PRBC units showed MRI T2* detectable hepatic iron (liver T2* value
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