An arrhythmia is a problem with the speed or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm. A heartbeat that is too fast is called tachycardia. A heartbeat that is too slow is called bradycardia. Most arrhythmias are harmless, but some can be serious or even life threatening. When the heart rate is too slow, too fast, or irregular, the heart may not be able to pump enough blood to the body. Lack of blood flow can damage the brain, heart, and other organs.
Each year 80,000 - 100,000 people in the U.S die suddenly from heart attacks without ever having had any symptoms of heart disease. In some cases, the victims of these unheralded sudden cardiac deaths had been taking dietary supplements containing ephedrine.
Howard Hughes Medical Institute researchers have pinpointed the genetic cause of a devastating but rare childhood disorder, called Timothy syndrome, which underlies a form of severe cardiac arrhythmia.
The Centers for Medicare & Medicaid Services (CMS) today proposed to expand coverage of implantable cardioverter defibrillators (ICDs), a move expected to save thousands of lives a year.
Vasogen has announced that comprehensive results from the Company's phase II trial of Celacade (immune modulation therapy) in advanced chronic heart failure patients were published in the September 15 issue of the Journal of the American College of Cardiology (JACC).
Reporting findings that may help explain links between the stress of traumatic events and increased risk of cardiac death, researchers said the rate of potentially life-threatening heart arrhythmias doubled during the month after the World Trade Center terrorist attack in 2001 in patients with implantable cardioverter-defibrillators, not only in the New York area, but also in Florida
The woman who swears by gingko biloba wonders why her mouth won't stop bleeding after wisdom tooth surgery. What she doesn't know is that the herbal remedy she takes religiously to enhance mental alertness also acts as a powerful blood thinner that inhibits clotting.
When athletes with irregular heartbeats are advised to stop intensive training, the arrhythmias often subside, and this response may help physicians decide which athletes may reenter competition, according to a new study in the Sept. 1, 2004 issue of the Journal of the American College of Cardiology.
Results of the Euro Heart Survey on atrial fibrillation (AF), demonstrate that many AF patients receive clot-preventing drugs while not at risk for stroke.
The worm C. elegans seems an unlikely candidate for studies related to cardiac arrhythmias. After all, the microscopic organism doesn't even have a heart.
The researchers studied 8 Sydney rock oysters, concentrating on the levels of omega-3 fatty acids in the gills, muscles and gonads.
Painless heart attacks or heart conditions can be commonly overlooked and undertreated at the hospital, often resulting in greater fatality rates than painful episodes.
Neurosurgeons at Rush University Medical Center are the first in Chicago to implant a new investigational neurostimulator in a patient with medically refractory epilepsy.
In animal and laboratory studies, scientists at Johns Hopkins have shown that modern, implanted heart assist devices - such as pacemakers and defibrillators - can be safe for use in magnetic resonance imaging (MRI) machines
People who suffer from chronic diseases, including high blood pressure, diabetes, asthma and heart problems should benefit from a new remote, home care monitoring system that could also bring an end to overcrowded waiting rooms.
A U.S. clinical study is just getting under way that, if successful, could lead to a non-surgical "cure" for the most common type of cardiac arrhythmia. The study is evaluating a new type of cryogenic catheter co-developed by the National Institute of Standards and Technology.
Their findings - published in the latest edition of Circulation Research, online July 8 - may lead to a gene therapy alternative to calcium channel blockers and their sometimes severe side effects, but also further interest in the development of gene therapies unique - as in this case - to one particular organ.
A potent chemotherapy that is highly effective in treating the most common form of childhood leukemia can significantly harm the heart, but findings from a multi-center study
Fatal heart attacks claims more lives than lung cancer, breast cancer and AIDS combined but it seems that maths, not medicine, holds the key to preventing these deaths among young people.
Long-chain omega-3 polyunsaturated fatty acids (n-3 LC-PUFAs) have benefits regarding cardiovascular and inflammatory function, certain types of cancer, and maternal and infant health, according to recent peer-reviewed studies.
Innovative research by UTS engineers to apply microwave energy to the treatment of potentially deadly heart rhythm disorders has received an important boost from the National Health and Medical Research Council (NHMRC).