Hemolysis refers to the breakdown of red blood cells, resulting in the release of their contents into the surrounding fluid. Normally, red blood cells have a lifespan of about 120 days. Once they reach the end of their life cycle, the spleen removes them from the bloodstream and new red blood cells take their place. However, in cases of hemolysis, red blood cells are destroyed at a faster rate than the body can replace them. This can lead to an imbalance in red blood cells or a condition known as hemolytic anemia. Hemolytic anemia can be categorized into two types: intrinsic and extrinsic.
Causes of Intrinsic Hemolytic Anemia
Intrinsic hemolytic anemia is a condition that is mainly inherited and occurs due to various defects in the red blood cells. These defects can include conditions such as sickle cell anemia or thalassemia, as well as issues with membrane production (such as hereditary spherocytosis) or red cell metabolism (pyruvate kinase deficiency). While anyone can develop hemolytic anemia, certain demographics, such as African-Americans, are more prone to this condition compared to Caucasians. This higher prevalence among African-Americans is likely attributed to the increased occurrence of sickle cell anemia within this population.
Causes of Extrinsic Hemolytic Anemia
Extrinsic hemolytic anemia is a type of acquired condition in which the body produces healthy red blood cells, only to have them destroyed by another source. This source can be an infection, certain drugs, or issues in the spleen. Let’s take a closer look at the causes of extrinsic hemolytic anemia.