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Showing 10 out of 2185 results
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Research Feature
The human heart is an amazing biological machine controlled by an internal electrical system that produces about 100,000 beats a day. When abnormal electrical activity causes the heart to beat too quickly, too slowly, or erratically, the condition is called an arrhythmia . Although most arrhythmias are harmless, some can interfere with the heart's...
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Research Feature
Blood has been called the river of life, and for good reason. Blood transports life-sustaining oxygen and nutrients. Blood automatically forms a clot when we get cut. Blood helps our immune system fight off germs. Each year, nearly 5 million Americans need a blood transfusion . Fortunately, the vast majority of transfusions are effective and cause...
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Research Feature
The heart is the first organ to form and begin working in humans. More than two decades of research have told us a lot about normal heart development. New diagnostic tools such as fetal echocardiography now allow doctors to find heart defects during pregnancy. In 1950, a child born with a congenital heart defect had only a 20 percent chance of...
Internal cardiovascular systems
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Research Feature
In the mid-20th century, deaths from cardiovascular diseases, and particularly coronary heart disease and stroke, were skyrocketing, yet no one was sure what caused cardiovascular diseases or how they could be treated or prevented. By 1950, more than twice as many Americans died annually from cardiovascular diseases as from cancer. Until the 1950s...
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Research Feature
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Today, many people know that a diet high in saturated fat and cholesterol can lead to clogged arteries and heart attacks , but that was not always common knowledge. The landmark Framingham Heart Study of the National Heart, Lung, and Blood Institute (NHLBI), begun in 1948, helped identify the...