Budd-Chiari syndrome is defined by occlusion of

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Budd-Chiari syndrome is defined by occlusion of

Budd-Chiari syndrome is a hepatic venous outflow obstruction. It occurs when the hepatic veins (which drain blood from the liver into the inferior vena cava) are occluded, leading to impaired drainage, hepatic venous congestion, and increased sinusoidal pressure. This congestion causes hepatomegaly and often ascites, with possible abdominal pain and, over time, liver dysfunction from venous congestion and ischemic injury. This makes the hepatic veins the correct target of obstruction. Occlusion of the portal vein would produce portal hypertension with varices and splenomegaly but via a different outflow pathway. Occluding the hepatic artery would primarily cause hepatic ischemia due to loss of arterial blood supply, not venous outflow obstruction. Occlusion of the biliary system would cause cholestasis and jaundice, not congestion from outflow blockage.

Budd-Chiari syndrome is a hepatic venous outflow obstruction. It occurs when the hepatic veins (which drain blood from the liver into the inferior vena cava) are occluded, leading to impaired drainage, hepatic venous congestion, and increased sinusoidal pressure. This congestion causes hepatomegaly and often ascites, with possible abdominal pain and, over time, liver dysfunction from venous congestion and ischemic injury.

This makes the hepatic veins the correct target of obstruction. Occlusion of the portal vein would produce portal hypertension with varices and splenomegaly but via a different outflow pathway. Occluding the hepatic artery would primarily cause hepatic ischemia due to loss of arterial blood supply, not venous outflow obstruction. Occlusion of the biliary system would cause cholestasis and jaundice, not congestion from outflow blockage.

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