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Why are lipids not predictive of cardiovascular death in the dialysis patient?
1Department of Internal Medicine, Ruperto Carola University Heidelberg, Germany.
Insights
Cardiovascular death is high in dialysis patients. Unlike in other groups, higher cholesterol levels in dialysis patients may indicate better survival, possibly due to malnutrition affecting cardiac risk.
Area of Science:
- Nephrology
- Cardiology
- Biochemistry
Background:
- Cardiovascular death rates are excessively high in dialysis patients, mirroring those in myocardial infarction survivors.
- Traditional lipid indicators of coronary heart disease risk are paradoxically higher in dialysis survivors than in those who die from cardiovascular causes.
Purpose of the Study:
- To investigate the complex relationship between lipid profiles, malnutrition, and cardiovascular mortality in patients undergoing dialysis.
- To explore the potential role of malnutrition in confounding the predictive value of lipids for cardiac death in this population.
Main Methods:
- Analysis of cardiovascular death rates and lipid profiles (total cholesterol, LDL cholesterol, apolipoprotein B, lipoprotein(a)) in dialysis patients.
- Comparison of lipid indicators between survivors and non-survivors of cardiovascular events.
- Consideration of malnutrition and L-arginine/nitric oxide pathways as potential confounding factors.
Main Results:
- Lipid indicators, except lipoprotein(a), were higher in dialysis survivors compared to those dying from cardiovascular causes.
- In diabetic dialysis patients, lipids remained predictive of cardiac death.
- Malnutrition may explain the inverse lipid-cardiac death relationship in non-diabetic dialysis patients.
Conclusions:
- The predictive value of traditional lipid markers for cardiac death is altered in dialysis patients, potentially due to malnutrition.
- Malnutrition may increase cardiovascular risk through mechanisms involving reduced L-arginine and nitric oxide synthesis.
- Further research is needed to elucidate the interplay between nutrition, lipids, and cardiovascular outcomes in dialysis populations.
Abstract:
The rate of cardiovascular death, and specifically of cardiac death, in dialysis patient is excessive and comparable to that in the high-risk group of survivors of myocardial infarction. Yet, in patients on dialysis total cholesterol, LDL cholesterol, apolipoprotein B and other indicators of coronary risk--with the exception of lipoprotein(a)--are consistently higher in survivors than in those dying from cardiovascular causes, but at least in diabetic patients on dialysis, an extremely high-risk population, lipids are predictive of cardiac death. Malnutrition as a confounding factor might explain the inverse relation between lipid indicators and cardiac death in nondiabetic patients. Indirect arguments can be marshalled that malnutrition increases cardiac death as a consequence of low L-arginine levels and the ensuing diminished synthesis of NO.