sábado, 20 de agosto de 2016

Gallstones Linked to Higher Heart Disease Risk: MedlinePlus

Gallstones Linked to Higher Heart Disease Risk: MedlinePlus

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Gallstones Linked to Higher Heart Disease Risk

Researcher says study highlights a connection between the gut and the cardiovascular system
     
Thursday, August 18, 2016
THURSDAY, Aug. 18, 2016 (HealthDay News) -- People who've ever suffered gallstones may have a slightly increased risk of developing heart disease down the road, a large new study suggests.
In a group of more than one-quarter million U.S. adults, researchers found those with a history of gallstones were 17 percent more likely to develop heart disease over the next few decades.
Gallstones and heart disease share some of the same risk factors -- such as obesity, type 2 diabetes and unhealthy cholesterol levels. But those risk factors couldn't completely explain away the finding, the researchers said.
To cardiologist Dr. Richard Stein, the study makes a "pretty convincing" case that gallstones, themselves, are a risk factor for heart disease.
Stein, who wasn't involved in the research, is director of the urban community cardiology program at New York University School of Medicine.
He said that people with a history of gallstones may want to pay extra attention to their cardiovascular health.
"Eat a heart-healthy diet, exercise, keep your blood pressure down. It would be prudent to get your other heart disease risk factors under control," said Stein, who is also a spokesperson for the American Heart Association.
Gallstones are hard particles that develop in the gallbladder -- a small organ that stores the bile fluids that help the body digest fat and fat-soluble vitamins.
Gallstones form when there are imbalances in the substances that make up bile: Excess cholesterol is the usual suspect, according to the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
For many people, gallstones cause no symptoms, NIDDK says. But if they block a bile duct, they can cause abdominal pain -- often after a heavy meal. Most often, treatment involves surgically removing the gallbladder.
Some studies have suggested that people with a history of gallstones face a higher risk of heart disease. But these studies have had limitations, according to Dr. Lu Qi, the senior researcher on the new study. Qi is also a professor at Tulane University in New Orleans.
So Qi's team combed through data from three large, long-running studies of U.S. health professionals.
In all, the studies followed more than 269,000 men and women for up to 30 years. Just over 6 percent of women and 3 percent of men said they'd ever been diagnosed with gallstones.
Among women, Qi's team found, those with a history of gallstones were up to 33 percent more likely to eventually develop heart disease. For men, gallstones were linked to an 11 percent increased risk.
The researchers then pooled those results with findings from four previous studies that included nearly 900,000 people. All together, they found that adults with a history of gallstones were 23 percent more likely to develop heart disease.
Although the study couldn't prove a cause-and-effect relationship between gallstones and heart disease, Qi suggested that changes in the gut's "microbiome" may play a role.
That refers to the trillions of bacteria and other microbes that normally dwell in the digestive system. Gallstones, Qi explained, can disrupt the balance of microbes in the gut, and recent studies have linked such disturbances to the risk of heart disease.
But, he stressed, that's just a theoretical explanation for now.
Stein speculated on another possibility: Some cases of gallstone disease might spur low levels of inflammation in the body that feed the development of heart disease.
"We've known for years that chronic, low-grade inflammation is associated with heart disease," Stein said.
Whatever the reasons for the link, Qi said it highlights a connection between the gastrointestinal and cardiovascular systems.
"To help protect your heart health, you may also need to protect your gastrointestinal system," he said.
There are certain risk factors for gallstones that you cannot change, according to NIDDK. People with a family history of them are at increased risk, for instance. Gallstones are also more common in women than men.
But some other factors -- such as obesity, and diets high in fat and processed carbohydrates -- can be changed, the institute suggests.
The study was published online Aug. 18 in the journal Arteriosclerosis, Thrombosis and Vascular Biology.
SOURCES: Lu Qi, M.D., Ph.D., professor, epidemiology, Tulane University, New Orleans; Richard Stein, M.D., director, urban community cardiology program, New York University School of Medicine, New York City; August 18, 2016, Arteriosclerosis, Thrombosis and Vascular Biology
HealthDay
News stories are provided by HealthDay and do not reflect the views of MedlinePlus, the National Library of Medicine, the National Institutes of Health, the U.S. Department of Health and Human Services, or federal policy.
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