Effects of low-sodium diet and spironolactone on portal pressure in patients with compensated cirrhosis†

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Abstract
The aim of this study was to investigate the hemodynamic effects of spironolactone associated with a low-sodium diet (n=14) or a low-sodium diet alone (n=9) in patients with compensated cirrhosis and portal hypertension. Spironolactone significantly reduced the plasma volume. This effect was associated with a significant reduction in the hepatic venous pressure gradient, from 17.6 ± 3.6 mm Hg to 15.3 ± 3.5 mm Hg (−13% ± 13%; p<0.01). Azygos blood flow (−20% ± 20%), cardiac output (−16.2% ± 10.5%) and mean arterial pressure (−9% ± 9%) also decreased significantly. However, there were no significant changes in hepatic blood flow. Patients receiving low-sodium diet alone experienced a mild but significant reduction in hepatic venous pressure gradient (−6.3% ± 6%) and in mean arterial pressure (−4% ± 5%). There were no significant changes in cardiac output and in hepatic or azygos blood flows. This study indicates that low-sodium diet plus administration of spironolactone reduces portal pressure and azygos blood flow in patients with compensated cirrhosis. Low-sodium diet alone only produces mild effects that are likely to be clinically irrelevant. (Hepatology 1994;19:1095-1099.)