Researchers discover how heart arrhythmia occurs
Researchers have discovered the fundamental biology of calcium waves in relation to heart arrhythmias.
Jan 19, 2014
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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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New research conducted at The Westmead Institute for Medical Research (WIMR) has solved a complication that could occur following an experimental procedure to repair damaged heart muscle. Currently, when a heart muscle is ...
Feb 6, 2024
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A study sets the foundation of a ground-breaking treatment regimen for treating ventricular arrhythmia. The research, published in Nature Communications, demonstrates the design and feasibility of a new hydrogel-based pacing ...
Jan 9, 2024
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To fill gaps in knowledge of yellow fever (YF), a group of researchers in Brazil affiliated with the Department of Pathology at the University of São Paulo's Medical School (FM-USP), Hospital das Clínicas (HC, the hospital ...
Dec 19, 2023
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A study led by Guadalupe Sabio and José Jalife at the Centro Nacional de Investigaciones Cardiovasculares (CNIC) in Madrid has identified a new signaling mechanism implicated in the development of ventricular fibrillation, ...
Nov 27, 2023
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The iHEART simulator is a mathematical and computational model of the human heart entirely developed at Politecnico di Milano and designed for studying coronary artery disease. This is the focus of research published in Scientific ...
Sep 18, 2023
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People who find it difficult to find time to exercise during a busy work week may concentrate their moderate-to-vigorous physical activity to one to two days of the week or weekend.
Jul 18, 2023
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Atrial and ventricular fibrillations are dangerous heart arrhythmias that claim millions of lives each year. Current treatment for them is a high-energy defibrillation shock that can be intensely painful and lead to further ...
Dec 13, 2022
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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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Electronic gaming can precipitate life-threatening cardiac arrhythmias in susceptible children whose predisposition may have been previously unrecognized, according to a new report in Heart Rhythm. The investigators documented ...
Oct 11, 2022
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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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