Although hyperlipidemia is a common feature of the nephrotic syndrome, the distribution of cholesterol among the plasma lipoproteins and the mechanism of the enhanced hepatic synthesis of lipoprotein lipids are not well understood. We studied the distribution of cholesterol among the plasma lipoproteins, as well as the relation between total cholesterol and plasma albumin concentration, oncotic pressure, and viscosity in 20 consecutive adult patients with uncomplicated nephrotic syndrome. The total plasma cholesterol (mean +/- S.D., 302 +/- 100 mg per deciliter [7.8 +/- 2.6 mmol per liter]) and low-density-lipoprotein cholesterol concentrations (215 +/- 89 mg per deciliter [5.6 +/- 2.3 mmol per liter]) were elevated in most patients, but the high-density-lipoprotein cholesterol level was normal or low (46 +/- 18 mg per deciliter [1.2 +/- 0.5 mmol per liter]) in 95 per cent of the patients. Thus, many hypercholesterolemic patients with unremitting nephrotic syndrome may be at increased risk for atherosclerotic heart disease. A significant inverse correlation was found between the total plasma cholesterol concentration and both the plasma albumin concentration (r = -0.528) and the plasma oncotic pressure (r = -0.674), but not the plasma viscosity (r = +0.319). Enhanced hepatic synthesis of lipoprotein lipids may be stimulated by a decreased plasma albumin concentration or oncotic pressure but does not appear to be due to changes in plasma viscosity.
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