Specks of calcium in the heart's artery walls could be an important prognostic marker of early cardiovascular disease in South Asians and may help guide treatment in this population, according to a study by researchers at UC San Francisco.
In a study of nearly 700 patients with ethnic backgrounds from India, Pakistan, Bangladesh, Sri Lanka, Nepal and Bhutan, UCSF researchers found that South Asian men had the same high rates of change in calcification of their artery walls over a five-year period as white men, the group with the highest rates of cardiovascular disease.
South Asians are known to have a high chance of developing cardiovascular disease and represent more than 60 percent of cardiovascular disease patients worldwide. They also develop risk factors such as high blood pressure, cholesterol and diabetes at a younger age than other racial and ethnic groups. However, it remains unclear which clinical factors could help determine those at highest risk.
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"While South Asians have high cardiovascular disease rates, there are few prospective studies in the world that have focused on determining the risk factors," said lead author Alka Kanaya, MD, UCSF Health internist and professor of medicine at UCSF. "The presence and change of coronary artery calcium may be useful for risk prediction in this ethnic population and may better guide the judicious use of statin and other preventive therapies."
Early signs of coronary artery calcification (CAC), in which calcium specks appear in artery walls, can be detected through a computed tomography (CT) scan. In other ethnic groups, high CAC scores have been proven to be an early sign of those at high risk of developing cardiovascular disease.
The American Heart Association recently recommended CAC testing in individuals with intermediate heart disease risk to help determine whether they should be treated with cholesterol-lowering medications. These guidelines classify South Asians as a high-risk group.
The study, appearing online Jan. 11, 2019, in the Journal of the American Heart Association (JAHA), is among the findings being generated by the ongoing Mediators of Atherosclerosis in South Asians Living in America (MASALA) study. Led by Kanaya, MASALA is the first long-term study in this population that aims to better understand the factors leading to heart disease and guide prevention and treatment. Since the study began in 2010, it has enrolled more than 1,100 South Asian immigrants living in the San Francisco Bay Area and greater Chicago area, most of whom have spent decades in the United States.
