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Serum lipoprotein (a) concentrations in patients undergoing continuous ambulatory peritoneal dialysis
N Anwar1, D Bhatnagar, C D Short
1Renal Unit, Manchester Royal Infirmary, UK.
Insights
Patients on continuous ambulatory peritoneal dialysis (CAPD) show significantly elevated serum lipoprotein (a) levels. This finding suggests a potential increased risk for cardiovascular disease in this patient group.
Area of Science:
- Cardiovascular Medicine
- Nephrology
- Lipid Metabolism
Background:
- Lipoprotein (a) [Lp(a)] is a low-density lipoprotein subspecies linked to ischemic heart disease and stroke risk.
- Continuous ambulatory peritoneal dialysis (CAPD) is a treatment for kidney failure.
- Understanding lipoprotein profiles in CAPD patients is crucial for assessing cardiovascular risk.
Purpose of the Study:
- To investigate serum concentrations of lipoprotein (a) and other lipoproteins in male CAPD patients.
- To compare lipid profiles of CAPD patients with healthy male and age-matched control groups.
- To explore potential implications of altered lipoprotein levels for cardiovascular risk in CAPD patients.
Main Methods:
- Serum samples were collected from 24 male CAPD patients.
- Lipoprotein (a) and other lipoprotein levels (triglycerides, VLDL-C, HDL-C) were measured.
- Data were compared to a healthy male cohort (n=100) and age-matched controls (n=38).
Main Results:
- CAPD patients exhibited a substantial elevation in serum lipoprotein (a) (median 46.9 mg/dl) compared to healthy controls (median 9.0 mg/dl, P < 0.001).
- CAPD patients showed significantly increased triglycerides and very-low-density lipoprotein cholesterol (VLDL-C) compared to healthy men.
- Only the VLDL-C difference remained significant (P < 0.001) when compared to age-matched controls.
Conclusions:
- Marked elevation of serum Lp(a) in CAPD patients may stem from increased hepatic synthesis due to protein loss in dialysate.
- Elevated Lp(a) concentrations in CAPD patients could contribute to their heightened risk of coronary artery disease.
- Further research is warranted to elucidate the mechanisms and clinical significance of these findings.
Abstract:
Lipoprotein (a) is a subspecies of low-density lipoprotein which possesses as part of its protein moiety a mutant form of plasminogen termed apolipoprotein (a), and which may be closely related to the risk of ischaemic heart disease and cerebral infarction. We have investigated the serum concentrations of lipoprotein (a) and other lipoproteins in 24 male patients on CAPD and compared them to healthy men (n = 100) and to age-matched healthy controls (n = 38). The most striking finding was a substantial elevation of serum lipoprotein (a) in CAPD patients in whom it was 46.9 (2.2-168) mg/dl (median and range) compared to 9.0 (< 0.6-87.4) mg/dl in healthy control group and 6.7 (< 0.6-84.2) mg/dl in age-matched controls (both P < 0.001). Patients, when compared to healthy men, also had significantly increased serum triglycerides (median and range, 1.94 (0.55-8.00) versus 1.24 (0.36-4.40) mmol/l; P < 0.001), very-low-density lipoprotein cholesterol (median and range, 0.98 (0.10-3.71) versus 0.46 (0.10-1.17) mmol/l; P < 0.001), and lower-high-density lipoprotein cholesterol (mean +/- 1 SD, 1.26 +/- 0.29 versus 1.35 +/- 0.31 mmol/l). Of these, however, only the difference in very-low-density lipoprotein cholesterol remained statistically significant (P < 0.001) in comparison to age-matched controls. The marked elevation of serum lipoprotein (a) in patients on CAPD may be due to increased hepatic synthesis as a consequence of the substantial amounts of plasma proteins lost in the dialysate. Elevated serum lipoprotein (a) concentrations in CAPD patients may contribute to their risk of coronary artery disease.