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The levels of plasma nitric oxide (NO), endothelin-1 (ET-1) and ALT in the patients with chronic hepatitis B and active cirrhosis and the correlation among them were observed and analyzed. NO3- was restored by using cadmium column assay and NO2- measured by heavy nitrogen assay. The primitive NO3- and total restored NO2-(NO3-/ NO2-) in plasma of the patients with chronic hepatitis and cirrhosis. Plasma ET-1 and ALT levels were determined by using radioimmunological assay and Lai's assay, respectively. Compared with normal control group, the plasma levels of NO2-/NO3- and ET-1 in the patients with chronic active hepatitis and active cirrhosis were significantly increased (P