How can an exchange transfusion treat severe hemolytic disease in a newborn?

Exchange transfusion is a critical medical procedure used to treat severe cases of erythroblastosis fetalis, also known as hemolytic disease of the newborn.12

In this condition, maternal antibodies cross the placenta and destroy the infant's red blood cells, leading to hemolysis and the accumulation of bilirubin, which can cause neurological damage. The procedure functions by gradually removing much or all of the infant's blood and replacing it with compatible donor blood.21

This process provides several therapeutic benefits:
* Elimination of Hemolysis: It replaces the infant's sensitized red blood cells with donor cells that do not react with the maternal antibodies.2
* Antibody Reduction: It significantly decreases the concentration of circulating maternal antibodies in the infant's system.2
* Recovery: By removing the source of destruction and the toxic breakdown products, the procedure allows the child to recover; once the remaining maternal antibodies disappear, the infant's own red blood cells are able to survive normally.2