from Physics 101: Pressure P = Flow Q x Resistance R (mm of mercury and cm of water are different ways of measuring pressure) a search on Yahoo http://ink.yahoo.com/bin/query?p=hepatic+vein+pressure+cirrhosis&hc=0&hs=0 Portal Hypertension - Pathogenesis Portal pressure can be defined by the equation P (portal pressure) = Q (blood flow in the portal venous system) x R (hepatic resistance). Any condition causing increased portal venous flow, or increased hepatic resistance, can develop into portal hypertension. In practice, most conditions associated with portal hypertension are due to a combination of these 2 factors. -- from Hepatitis Central http://hepatitis-central.com/hcv/liver/portal2.html PORTAL HYPERTENSION: a portal venous pressure greater than 20 mm Hg associated with splenomegaly, increased collateral circulation, varicosity, bleeding and ascites. -- from Definitions of Liver Diseases and Disorders - Hepatitis C Forum http://www.hepatitis-c.de/hepace.htm see also, Portal Hypertension - Hepatitis C Society of Canada http://www.pacificcoast.net/~hepcvic/hypertension.htm Cirrhosis - Diseases of the Liver - COLUMBIA UNIVERSITY GASTROENTEROLOGY WEB http://cpmcnet.columbia.edu/dept/gi/cirrhosis.html "... Radiological and nuclear medicine tests may give clues as to the presence of cirrhosis, but the diagnosis of cirrhosis must often be made by liver biopsy." Another interesting article: The Mechanism of Progression of Chronic Liver Disease: Implications for Histological Grading and Staging http://www.hepnet.com/boca/wanless.html Abstract: The accurate assessment of activity and architectural distortion in chronic liver disease requires knowledge of the lesions that lead to cirrhosis. ... peter sam, web content developer Primary Care Clinical Practice Guidelines' http://medicine.ucsf.edu/resources/guidelines/ [log in to unmask] asian health services 818 webster oakland ca On Tue, 21 Sep 1999 16:34:54 -0400, Carrico, Diane F. <[log in to unmask]> wrote: >I have a radiologist who is looking for the conversion factor that gives the >pressure inside the hepatic vein. He remembers that the formula is: mm of >mercury X cm of water but he doesn't recall the exact formula that's used. >This factor is used to >to determine cirrhosis of the liver. I checked "Bockus Gastroenterology," >5th ed., and, "Sleisenger & Fordtran's Gastrointestinal and Liver Disease," >6th edition, but, the conversion factor wasn't mentioned. The doctor said >he saw this is a textbook long ago so it may not be used anymore. Any help >would be appreciated.