Medicine:Portacaval shunt
A portacaval shunt, portocaval shunt, or portal-caval shunt is a treatment for portal hypertension. A connection (a shunt) is made between the portal vein, which supplies 75% of the liver's blood, and the inferior vena cava, the vein that drains blood from the lower two-thirds of the body. The most common causes of liver disease resulting in portal hypertension are Budd–Chiari syndrome or cirrhosis. Budd–Chiari syndrome should not be mistaken for cirrhosis.
Less common causes include diseases such as hemochromatosis, primary biliary cirrhosis (PBC), and portal vein thrombosis.[citation needed]
Cirrhotic patients often develop hepatic encephalopathy (HE) following the procedure,[1] sometimes resulting in coma.[2] The high risk of developing HE may be a consequence of increased intestinal absorption of encephalopathogenic substances in combination with the reduced hepatic blood flow.[1]
A portacaval anastomosis is analogous in that it diverts circulation; as with shunts and anastomoses generally, the terms are often used to refer to either the naturally occurring forms or the surgically created forms.
References
- ↑ 1.0 1.1 Iwatsuki, Shunzaburo (September 1974). "A case of hepatic encephalopathy after portacaval shunt". The Japanese Journal of Surgery 4 (3): 183–188. doi:10.1007/bf02468624. PMID 4464374.
- ↑ "Partial versus total portacaval shunt in alcoholic cirrhosis. Results of a prospective, randomized clinical trial". Annals of Surgery 219 (4): 353–61. April 1994. doi:10.1097/00000658-199404000-00005. PMID 8161260.
External links
- Portacaval+shunt at the US National Library of Medicine Medical Subject Headings (MeSH)
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