Abstract
The concentrations of lipids, bile acids and proteins were evaluated in the ascitic fluid and plasma of 23 cirrhotics. Ascitic fluid density was highly correlated with its protein content, represented mostly by low molecular weight proteins. The ratio of plasma to ascitic fluid concentrations of nine examined proteins increased with molecular weight, indicating a selective ultrafiltration of the peritoneal transudate. Low density lipoproteins in ascitic fluid had modified electrophoretic mobility. Total cholesterol had a higher plasma to ascitic fluid ratio than high density lipoprotein cholesterol, whereas bile acids and proteins had similar plasma to ascitic fluid ratios. Indeed, bile acids strongly bind to circulating albumin: consequently ascitic fluid contains more cholic acid (less hydrophobic) than other bile acids. Analysis of both plasma and ascitic fluid composition in cirrhotics provides useful information on processes regulating passage of blood components into the peritoneal cavity.
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