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How can exchange transfusion treat severe erythroblastosis fetalis?

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Close-up illustration of multiple human red blood cells with their characteristic disc shape, floating against a red background. — blood group The major component of human blood is the red blood cell.

Exchange transfusion is a critical medical procedure used to treat severe cases of erythroblastosis fetalis, a condition where maternal antibodies destroy a fetus's red blood cells due to blood group incompatibility.123

The procedure involves the gradual removal of the infant's blood and its replacement with compatible donor blood. This intervention treats the disease through several key mechanisms:1

Elimination of Hemolysis: By replacing the infant's blood with donor red cells that do not react with the maternal antibodies, the procedure significantly reduces the ongoing destruction of red blood cells.3
Antibody Removal: The process decreases the concentration of circulating maternal antibodies that are actively attacking the infant's system.3
Management of Hyperbilirubinemia: The destruction of red blood cells releases bilirubin, which can cause severe neurological damage if it accumulates in the brain (kernicterus). Exchange transfusion effectively removes this excess bilirubin from the circulation.23

Once the maternal antibodies are cleared from the infant's system, the child's own red blood cells can survive and function normally.3