Cardiology

Effectiveness of subcutaneous defibrillators

Electric shocks delivered by subcutaneous defibrillators are equally effective compared to shocks delivered by conventional transvenous defibrillators, according to a study published in the journal Circulation.

Cardiology

Mayo Clinic Minute: Watch for these heart arrhythmia red flags

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, ...

Cardiology

Driving with heart disease: Checking fitness to drive for safety

People suffering from various types of cardiovascular disease are subject to a certain accident risk when driving a vehicle on the road. High blood pressure, coronary heart disease and cardiac insufficiency might be grounds ...

Cardiology

New tool predicts sudden death in inflammatory heart disease

Johns Hopkins University scientists have developed a new tool for predicting which patients suffering from a complex inflammatory heart disease are at risk of sudden cardiac arrest. Published in Science Advances, their method ...

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Cardiac arrhythmia

Cardiac arrhythmia (also dysrhythmia) is a term for 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 and sudden death. Others cause symptoms such as an abnormal awareness of heart beat (palpitations), and may be merely annoying. Still others may not be associated with any symptoms at all, but predispose toward potentially life-threatening stroke or embolus.

Some arrhythmias are very minor and can be regarded as normal variants. In fact, most people will sometimes feel their heart skip a beat, or give an occasional extra strong beat  neither of these is usually a cause for alarm.

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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