Abstract. The aim of the present study was to explore the clinical value of urinary retinol-binding protein (RBP) level in the prognosis of cirrhotic ascites by assessment of the RBP levels prior to and following ascites treatment. The levels of urinary RBP, urinary microalbumin (mAlb), serum urea nitrogen (urea) and serum creatinine (Cr), and the estimated glomerular filtration rate (eGFR) were measured in 90 patients with cirrhosis and ascites hospitalized in a single institution between May 2011 and January 2012, and in 30 healthy controls. The levels of urinary mAlb, serum urea and serum Cr were higher in the cirrhotic patients compared with the healthy controls (P<0.05). Urinary RBP levels were significantly higher and eGFR was significantly lower in the liver cirrhosis group compared with the healthy control group (P<0.01). Urinary RBP, urinary mAlb, serum urea and serum Cr increased and eGFR decreased as the severity of the ascites increased (P<0.05). Urinary RBP was significantly higher in patients whose ascites did not respond or was refractory compared with those in whom it subsided (P<0.05), exhibiting a gradual increase over time in the former and a gradual reduction over time in the latter group (P<0.05). Increased urinary RBP and decreased eGFR in the early stage of cirrhosis ascites suggested impaired renal function, which serves a role in the process of ascites formation. These results indicated that urinary RBP is a sensitive indicator of early renal injury in patients with ascites due to cirrhosis and is closely associated with the progression of cirrhotic ascites.
IntroductionCirrhosis is a chronic, progressive, diffuse disease caused by a variety of factors, including hepatitis B virus, alcoholic liver disease and autoimmune liver disease (1-3). Liver cirrhosis mortality increased from 1.54% of global mortality in 1980 to 1.95% in 2010 (4). Ascites is a common complication of cirrhosis decompensation. Approximately 50% of patients with compensated cirrhosis develop ascites within a period of 10 years (5). The emergence of ascites predicts a poor prognosis of decompensated cirrhosis, with a mortality of 15% after 1 year and 44% at the 2 year follow-up. (6). In addition, the quality of life of patients with cirrhosis decreases following the formation of ascites and the 5-year survival rate drops to 50% (7). When ascites progress to refractory ascites, if a liver transplant is not conducted, the prognosis worsens and the 2-year survival rate falls to 35-50% (8). Treatment of ascites not only improves the quality of life of patients, but also reduces the risk of progression to spontaneous bacterial peritonitis, which is the most common fatal complication of liver cirrhosis (9). An improved understanding of the pathophysiological mechanism for ascites in patients with liver cirrhosis is necessary to improve patient treatment and to assist the use of targeted therapies.Ascites formation is the result of the combined action of many factors; however, the mechanism underlying the formation of cirrhoti...