why is LDL reduced in hemolytic jaundice
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hemolytic anemia lower LDL cholesterol mechanism
LDL cholesterol may fall in hemolytic jaundice because chronic hemolysis causes compensatory erythropoiesis. The marrow produces many new red cells, and each new red-cell membrane requires substantial cholesterol. This increases cholesterol utilization and can lower circulating total cholesterol and LDL.
Other contributing mechanisms may include:
- Reduced red-cell mass: erythrocytes act as a large exchangeable cholesterol pool, so severe anemia is associated with lower plasma cholesterol.
- Increased reticuloendothelial clearance of cholesterol from destroyed RBC membranes.
- Sometimes hemodilution, poor nutrition, inflammation, or impaired hepatic cholesterol synthesis contribute.
So, the key exam mechanism is:
Hemolysis -> increased erythropoiesis -> increased cholesterol consumption for RBC membrane synthesis -> decreased serum LDL.
This is an association with hemolytic anemia, not a direct effect of unconjugated bilirubin itself. The mechanism is not fully settled, but increased erythropoietic demand is the traditional explanation. A review of anemia and cholesterol discusses this proposed marrow consumption; in sickle-cell disease, lower LDL also tracks more closely with the severity of anemia than hemolysis alone in this cohort study.
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