Coronary microvascular disease (MVD) is heart disease that affects the tiny coronary (heart) arteries. In coronary MVD, the walls of the heart's tiny arteries are damaged or diseased.
Coronary MVD is different from traditional coronary heart disease (CHD), also called coronary artery disease. In CHD, a waxy substance called plaque (plak) builds up in the large coronary arteries.
Plaque narrows the heart's large arteries and reduces the flow of oxygen-rich blood to your heart muscle. The buildup of plaque also makes it more likely that blood clots will form in your arteries. Blood clots can mostly or completely block blood flow through a coronary artery.
In coronary MVD, however, the heart's tiny arteries are affected. Plaque doesn't create blockages in these vessels as it does in the heart's large arteries.
Coronary Microvascular Disease
Studies have shown that women are more likely than men to have coronary MVD. Many researchers think the disease is caused by a drop in estrogen levels during menopause combined with traditional heart disease risk factors.
Diagnosing coronary MVD has been a challenge for doctors. Standard tests used to diagnose CHD aren't designed to detect coronary MVD. More research is needed to find the best diagnostic tests and treatments for the disease.
Most of what is known about coronary MVD comes from the National Heart, Lung, and Blood Institute's Wise study (Women's Ischemia Syndrome Evaluation).
The WISE study started in 1996. The goal of the study was to learn more about how heart disease develops in women.
Currently, research is ongoing to learn more about the role of hormones in heart disease and to find better ways to diagnose coronary MVD.
Studies also are under way to learn more about the causes of coronary MVD, how to treat the disease, and the expected health outcomes for people with coronary MVD.
Celebrating American Heart Month: NIH Advancing Heart Research02/07/2014
More than 100 members of the NIH community gathered at the NIH Clinical Center in Bethesda, MD, to raise awareness about women and heart disease. The crowd formed a giant human heart in honor of National Wear Red Day, which takes place each year on the first Friday of February. Speakers at the event included Dr. Francis Collins, director of the NIH; Dr. Gary H. Gibbons, director of the NHLBI; Dr. Griffin Rodgers, director of the National Institute of Diabetes and Digestive and Kidney Diseases; Dr. Janine Clayton, director of the NIH Office of Research on Women's Health; and Dr. John Gallin, director of the NIH Clinical Center. For more information about heart disease, visit the NHLBI web site. If you share this video on Twitter, please use #NationalWearRedDay.