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High-density lipoprotein cholesterol subfractions in chronic uremia
Insights
Chronic renal failure (CRF) is linked to lower high-density lipoprotein (HDL) cholesterol, especially in men. This decrease may explain increased cardiovascular risk, suggesting early kidney transplantation is beneficial.
Area of Science:
- Nephrology
- Cardiology
- Clinical Chemistry
Background:
- Cardiovascular disease is a major concern in patients with chronic renal failure (CRF).
- High-density lipoprotein (HDL) cholesterol levels, particularly its subfractions, are crucial in cardiovascular risk assessment.
- The impact of CRF severity on HDL subfractions and cholesterol content remains incompletely understood.
Purpose of the Study:
- To investigate cholesterol content in HDL subfractions in patients with CRF at various stages.
- To compare HDL subfraction cholesterol levels between CRF patients, healthy controls, hemodialysis patients, and renal graft recipients.
- To explore the relationship between HDL subfractions, CRF severity, and cardiovascular risk factors.
Main Methods:
- Analysis of cholesterol content in HDL subfractions (total HDL and HDL2).
- Study population included 108 patients with CRF under conservative treatment, healthy controls, hemodialysis patients, and renal graft recipients.
- Statistical comparison of HDL subfraction cholesterol levels across different patient groups and correlation analysis with serum creatinine.
Main Results:
- Men with CRF showed significantly lower total HDL and HDL2 cholesterol levels, with severity correlating inversely with HDL2 cholesterol and serum creatinine.
- Women with CRF exhibited a trend towards lower total and HDL2 cholesterol, but without significant differences across CRF severity.
- Hemodialysis patients had decreased HDL2 cholesterol, while renal graft recipients showed increased total and HDL2 cholesterol.
Conclusions:
- Progressive decrease in total HDL and HDL2 cholesterol in men with CRF and hemodialysis patients may contribute to elevated cardiovascular mortality.
- The findings support the
- HDL hypothesis
- and highlight the role of HDL subfractions in CRF-associated cardiovascular risk.
- Early kidney transplantation is suggested as a strategy to potentially improve HDL levels and mitigate cardiovascular risk in CRF patients.
Abstract:
Cholesterol content in high-density lipoprotein (HDL) subfractions has been studied in 108 patients at different evolutive stages of chronic renal failure (CRF) under conservative treatment. Results have been compared with healthy control subjects, patients receiving hemodialysis, and renal graft recipients. Significant low levels of total HDL and HDL2 cholesterol are observed in men with CRF. The more severe the CRF, the more likely that total HDL and HDL2 cholesterol will be low. Moreover, a significant inverse correlation is found between HDL2 cholesterol and serum creatinine levels. In women, although a decrease in total and HDL2 subfraction is observed, no significant differences are found across the severity of CRF. Serum HDL2 cholesterol levels are decreased in men and women receiving hemodialysis, while raised total HDL and HDL2 cholesterol levels are observed in normally functioning renal grafts. These results indicate that according to the "HDL hypothesis," despite other associated risk factors, the high cardiovascular mortality rates noted mainly in men with CRF under conservative treatment and in patients receiving hemodialysis could be explained, at least in part, by the sustained and progressive decrease in total HDL and HDL2 values. From this point of view, our study suggests the need to promote early kidney transplantation.