Rare constitutional hemolytic anemia

Rare constitutional hemolytic anemia is a broad grouping term used in the Orphanet classification (ORPHA:182043) to encompass a heterogeneous collection of inherited (constitutional) hemolytic anemias that are individually rare. These are genetic conditions in which red blood cells are prematurely destroyed (hemolysis), leading to anemia. The underlying defects can involve red blood cell membrane proteins, red blood cell enzymes, or hemoglobin structure and synthesis, though this category specifically captures those constitutional hemolytic anemias that are considered rare. The hallmark clinical features shared across these conditions include chronic or episodic anemia, jaundice (yellowing of the skin and eyes due to elevated bilirubin from red cell breakdown), splenomegaly (enlarged spleen, as the spleen works to clear damaged red blood cells), fatigue, pallor, and dark urine. Patients may also be at risk for gallstones due to chronic bilirubin overproduction and may experience aplastic crises triggered by infections such as parvovirus B19. The severity varies widely depending on the specific underlying genetic defect, ranging from mild compensated hemolysis to severe transfusion-dependent anemia. Treatment depends on the specific subtype and severity. General management strategies include folic acid supplementation to support increased red blood cell production, blood transfusions for severe anemia or aplastic crises, and splenectomy in selected cases where the spleen is a major site of red cell destruction. Iron chelation therapy may be necessary for patients who develop iron overload from chronic transfusions. For some subtypes, hematopoietic stem cell transplantation may be considered in severe cases. Genetic counseling is recommended for affected families.

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