Regular transfusion lowers plasma free hemoglobin in children with sickle-cell disease at risk for stroke.

Background And Purpose: Intravascular hemolysis releases large amounts of free hemoglobin (PFH) in plasma of sickle-cell disease (SCD) patients. PFH has been associated with harmful endothelial actions including scavenging nitric oxide (NO). Whether PFH plays a role in stroke in SCD has not been examined.