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The association beta-blockers plus nitrates has been reported to impair renal function and renal sodium handling, leading to increased risk of development of ascites, or worsening of a preexisting ascites, or increase in the requirements of diuretic agents. In 81 patients with cirrhosis and esophageal varices, participating in a multicenter controlled clinical trial of prophylaxis of variceal bleeding comparing nadolol (NAD) plus isosorbide-5-mononitrate (I5M) with NAD alone, renal function, presence of ascites, and diuretic requirements were assessed at inclusion and after 6 months of follow-up. No significant variation in s-urea or s-creatinine was observed in either group, Three patients in the nadolol group and two in the NAD plus I5M developed ascites at 6 months (P = .70), and a need to increase diuretic regimen was observed in four and three patients, respectively (P = .76). Decrease in heart rate and in mean arterial pressure was similar in the two groups. There was a significant correlation between increases in s-creatinine and decrease in mean arterial pressure in the whole series (P = .015). Only in patients treated with the association was there a significant larger proportion of patients ascitic who became anascitic, than of patients anascitic who became ascitic (P = .03). In patients treated with the association, there was a significantly larger decrease in hepatic venous pressure gradient (P = .05). It is concluded that patients treated with the association NAD plus I5M are not at increased risk of developing renal dysfunction or worsening of ascites compared with patients treated with NAD alone.(ABSTRACT TRUNCATED AT 250 WORDS)