Abstract: Objective To investigate the effect of seru Msodiu Mlevel on complications in patients with decompensated liver cirrhosis. Methods According to seru Msodiu Mlevel,212 decompensated liver cirrhosis cases were divided into normal group and hyponatremia group（including mild,Moderate and severe subgroups）. Sequentially,the influences of different seru Msodiu Mlevels on complications in all enrolled patients were retrospectively analyzed. Results As seru Msodiu Mlevel declined,Mortality and Morbidity were significantly increased because of complications,such as ascites,spontaneous bacterial peritonitis and hepatic encephalopathy（except gastrointestinal bleeding）and so on. The occurrence rates of complications in normal,mild,Moderate and severe groups were 33.0％,73.8％,91.4％,100.0％for ascites,3.5％,14.3％,28.6％,55.0％for spontaneous bacterial peritonitis,7.0％、11.9％、28.6％、60.0％for hepatic encephalopathy,respectively,with Mortality of 6.09％,11.90％,31.43％,60.00％,respectively. Normal group displayed significantly lower complication Morbidity and Mortality than Moderate and severe groups did（P<0.05）. Mean w hile,complication Morbidity and Mortality in mild and Moderate group were significantly lower than those in severe group（P<0.05）. Conclusion Seru Msodiu Mlevel can be a Monitoring indicator to predict the prognosis of patients with decompensated liver cirrhosis.

Key words: Seru Msodiu m, Liver cirrhosis, complications, Influence