Portosystemic shunt ratio

The portosystemic shunt ratio is a measure performed using ultrasound to quantify the abnormal flow of portal venous blood that is shunted away from the hepatic sinusoidal circulation in the context of a congenital portosystemic shunt 1.


The ratio is determined using the following equations:

  • portovenous shunt ratio = blood flow volume in shunt vessel / blood flow volume in portal vein

Where blood flow volume is determined by:

  • blood flow volume = lumen area x mean velocity

It has been published that shunt ratios of <24-30% do not cause hepatic encephalopathy1


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Article information

rID: 54460
Section: Physics
Synonyms or Alternate Spellings:

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