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Effects of three treatment modes on plasma lipids and lipoproteins in uraemic patients.

Plasma lipids, chemical composition of various lipoprotein fractions, apolipoprotein B concentrations and apolipoprotein E phenotypes were studied in 12 uraemic patients on conservative treatment (CT), in 16 patients on haemodialysis (HD) and in 18 patients on continuous ambulatory peritoneal dialysis treatment (CAPD). Plasma total cholesterol and triglyceride concentrations were increased in the CAPD patients in comparison to the HD patients and the control subjects. Moreover, the CAPD patients had higher LDL cholesterol concentration than the CT and HD patients. The HDL cholesterol concentration was lower in the HD and CAPD patients than in the control subjects. The chemical composition of lipoproteins in all fractions of the CT and HD patients and in VLDL, IDL and LDL fractions of the CAPD patients differed from those of the control subjects. The main differences were the increased proportion of triglycerides in VLDL and LDL fractions of all the patient groups and in HDL fraction of the CT and HD patients in comparison to the control subjects. Moreover, the proportion of cholesterol was increased in VLDL and IDL fractions of the CT and the CAPD patients and decreased in HDL fraction of the CT and HD patients compared to the control subjects. In conclusion, in addition to the alterations in the lipoprotein concentrations in uraemic patients there are also marked changes in the chemical composition of the lipoprotein particles that may further contribute to the accelerated atherosclerosis among uraemic patients. The abnormalities are particularly prevalent in CAPD patients.