Staging of liver fibrosis or cirrhosis: The role of hepatic venous pressure gradient measurement

Figure 1 Increase of hepatic venous pressure gradient in liver fibrosis. A: In normal liver, wedge pressure is equivalent to hepatic sinusoidal pressure; B: In cirrhosis, pressure is equivalent to that in the portal vein, and then wedge pressure can be considered equivalent to the portal vein pressure. WHVP: Wedged hepatic venous pressure; FHVP: Free hepatic venous pressure.