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Elevated liver enzymes associated with higher future mortality
Date:3/3/2008

A new population-based epidemiological study has found that elevated liver enzymes discovered during routine medical care are associated with higher future mortality. The findings are in the March issue of Hepatology, a journal published by John Wiley & Sons on behalf of the American Association for the Study of Liver Diseases (AASLD). The article is also available online at Wiley Interscience (http://www.interscience.wiley.com/journal/hepatology).

Liver enzymes include aspartate aminotransferase (AST) and alanine aminotransferase (ALT), and high concentrations in the blood tend to indicate liver disease. About 10 percent of Americans have an elevated liver enzyme with no evidence of a cause such as hepatitis C or excessive alcohol consumption. Presumably, many cases are due to non-alcoholic fatty liver disease.

Studies in other countries have shown that elevated liver enzymes are associated with future mortality, however the link has never been examined in a U.S. population, so researchers led by Tae Hoon Lee of the Mayo Clinic in Rochester, Minnesota set out to address this question. They used data from Olmsted County, MN, where most of the population has had medical care at Mayo Clinic facilities, and included all adult patients who had their AST or ALT levels measured during routine visits in 1995. Those with levels above the upper limit of normal were followed forward until April 2006 to determine their survival.

AST was measured in 18,401 residents, and 2,350 (13 percent) had results above the upper limit of normal. Of 6,823 people who had their ALT measured, 911 (13 percent) had results higher than the upper limit of normal.

After excluding those who moved away from the community, or died within two years (to rule out terminal illness as the cause of the abnormal liver enzyme levels), the researchers used the Kaplan-Meier method to estimate survival.
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Contact: Amy Molnar
amolnar@wiley.com
Wiley-Blackwell
Source:Eurekalert

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