Chloroquine, hydroxychloroquine and azithromycin are being used to treat and prevent COVID-19 despite weak evidence for effectiveness, and physicians and patients should be aware of the drugs' potentially serious adverse ...
Apr 8, 2020
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Researchers have discovered the fundamental biology of calcium waves in relation to heart arrhythmias.
Jan 19, 2014
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Continuous indoor exposure to second-hand tobacco smoke triggers changes in the heart's electrical activity, known as cardiac alternans, that can predict cardiac arrhythmia and sudden cardiac death, a new study from UC Davis ...
Dec 27, 2018
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Led by the University of Oxford, a team of UK-based researchers have today reported results of the largest ever study to compare the risks of cardiovascular events, such as myocarditis, pericarditis, and cardiac arrhythmia, ...
Dec 14, 2021
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Using high-tech human heart models and mouse experiments, scientists at Johns Hopkins and Germany's University of Bonn have shown that beams of light could replace electric shocks in patients reeling from a deadly heart rhythm ...
Sep 12, 2016
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When the heart gets out of rhythm, characteristic processes occur in the heart muscle cells. Among other things, the currents of electrically charged particles (ions) change. In chronic atrial fibrillation, one of these currents ...
Apr 25, 2023
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University of Maryland School of Medicine researchers have uncovered a previously unknown molecular pathway that is critical to understanding cardiac arrhythmia and other heart muscle problems. Understanding the basic science ...
Oct 26, 2011
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A recent study published in Nature Genetics identified 10 new genetic regions associated with Brugada syndrome, a cardiac arrhythmia disorder associated with sudden death in young adults.
Mar 31, 2022
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Cardiac arrhythmias are a major cause of morbidity and mortality worldwide. Currently, the 12-lead electrocardiogram (ECG) is the noninvasive clinical gold standard used to diagnose and localize these conditions, but it has ...
Mar 25, 2020
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A new nanoparticle developed by University of Michigan researchers could be the key to a targeted therapy for cardiac arrhythmia, a condition that causes the heart to beat erratically and can lead to heart attack and stroke.
Oct 29, 2015
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Cardiac dysrhythmia (also known as arrhythmia and irregular heartbeat) is any of a large and heterogeneous group of conditions in which there is abnormal electrical activity in the heart. The heart beat may be too fast or too slow, and may be regular or irregular.
Some arrhythmias are life-threatening medical emergencies that can result in cardiac arrest. Others cause symptoms such as an abnormal awareness of heart beat (palpitations), and may be merely annoying. These palpitations have also been known to be caused by atrial/ventricular fibrillation, wire faults, and other technical or mechanical issues in cardiac pacemakers/defibrillators. Still others may not be associated with any symptoms at all, but may predispose the patient to potentially life threatening stroke or embolism.
Some arrhythmias are very minor and can be regarded as normal variants. In fact, most people will on occasion feel their heart skip a beat, or give an occasional extra strong beat; neither of these is usually a cause for alarm.
Proarrhythmia is a new or more frequent occurrence of pre-existing arrhythmias, paradoxically precipitated by antiarrhythmic therapy, which means it is a side effect associated with the administration of some existing antiarrhythmic drugs, as well as drugs for other indications. In other words, it is a tendency of antiarrhythmic drugs to facilitate emergence of new arrhythmias.
The term sinus arrhythmia refers to a normal phenomenon of mild acceleration and slowing of the heart rate that occurs with breathing in and out. It is usually quite pronounced in children, and steadily decreases with age. This can also be present during meditation breathing exercises that involve deep inhaling and breath holding patterns.
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