A heart arrhythmia is an irregular heartbeat. It occurs when the electrical signals that tell the heart when to beat and pump blood aren't functioning properly. Some heart arrhythmias can be harmless and just bothersome, ...
Dec 8, 2021
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Heart attacks scar the heart, leaving patients vulnerable to heart rhythm disorders that can lead to sudden death. While not all who have experienced a cardiac infarction will develop an arrhythmia, if they do, it will typically ...
Oct 6, 2022
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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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One of the most serious complications of diabetes, heart arrhythmias, is now on its way to be prevented and combated. Researchers from the Federal University of Rio de Janeiro (UFRJ) in partnership with investigators from ...
Nov 24, 2016
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University of Utah Health scientists have corrected abnormal heart rhythms in mice by restoring healthy levels of a protein that heart cells need to establish connections with one another. That protein, GJA1-20k, is underproduced ...
Mar 18, 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 new study from University of Louisville researchers in the Christina Lee Brown Envirome Institute has found that exposure to e-cigarette aerosols can cause heart arrhythmias in animal models—both in the form of premature ...
Oct 25, 2022
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Could it be that when Ludwig van Beethoven composed some of the greatest masterpieces of all time that he was quite literally following his heart?
Jan 7, 2015
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Researchers developed a new class of medical instruments equipped with an advanced soft electronics system that could dramatically improve the diagnoses and treatments of a number of cardiac diseases and conditions.
Sep 7, 2020
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Does the sight of your loved one make your heart skip a beat … literally? Well, that may not be a good thing. Doctors at Baylor College of Medicine say while heart palpitations are common, they should not be ignored.
Feb 7, 2017
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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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