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
- 1. Gallego C, Miralles M, Marín C, Muyor P, González G, García-Hidalgo E. Congenital hepatic shunts. Radiographics : a review publication of the Radiological Society of North America, Inc. 24 (3): 755-72. doi:10.1148/rg.243035046 - Pubmed