Seventy cases of congential heart disease including the most frequent types were studied, and wedge hepatic venous pressure (WHVP) was measured in each. The mean pressure was determined in the "jammed position" and in the free hepatic veins, inferior vena cava, and low right atrium. The average mean WHVP was 7.0 mm Hg, 5.0 in inferior vena cava, and 3.4 in the right atrium. A direct relationship was found between wedge hepatic venous pressure of the inferior vena cava and the low right atrium, but not other parameters. Ten patients had a mean pressure above 10 mm Hg. We believe that in many circumstances in patients with congenital heart disease, liver function may be abnormal and high values of wedge hepatic venous pressure may also be found.