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'Gut Reaction' May Predict Cardiovascular Risk
Date:4/25/2013

By Steven Reinberg
HealthDay Reporter

WEDNESDAY, April 24 (HealthDay News) -- A blood test that assesses levels of a compound produced in the stomach appears to be a strong indicator of whether there will be heart trouble down the road, researchers report.

The higher the levels of the compound -- called trimethylamine-N-oxide (TMAO) -- the greater the risk for cardiovascular problems, said the Cleveland Clinic team. Eventually, TMAO could be a target to help prevent or reduce the risk of heart problems, the researchers suggested.

"A new blood test measuring something in the blood that is generated by the bacteria in our gut actually predicted in a strong and powerful way the future risk of heart attack, stroke and death," said lead researcher Dr. Stanley Hazen, from the Clinic's Lerner Research Institute.

Measuring TMAO predicted heart risk better than other blood tests or the usual risk factors, such as high blood pressure, cholesterol and smoking, he noted.

"This is a potentially new target we can go after to prevent heart disease," Hazen said.

In a preclinical study, the researchers found that dietary choline -- found in egg yolks -- is metabolized into TMAO. Carnitine, found in red meat, is another potential source of the compound. According to Hazen, TMAO changes how cholesterol is metabolized. "It's not changing the cholesterol in your blood, it's changing how the cholesterol is being managed," he said.

More specifically, TMAO helps cholesterol attach to blood vessels. It also makes it harder for the liver and the intestines to get rid of cholesterol, he explained.

"This new blood test may help identify people who are most in need of getting preventive cardiology help," Hazen said.

Because TMAO levels seem related to diet -- those who eat the most meat have the highest levels -- Hazen said the test could help people tailor their diets to reduce the risk of cardiovascular
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