Arrhythmia
Heart and circulation
There are a number of different types of arrhythmia. Most arrhythmias that come from the top of your heart (supraventricular or atrial) can cause symptoms but aren't life threatening. Arrhythmias that arise from your ventricles (ventricular) are more serious and can sometimes be fatal.
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Atrial fibrillation is when the heart beats too fast in an irregular rhythm. It is caused by faulty electrical signals in your heart and is the most common type of arrhythmia (...
Ventricular tachycardia causes your heart to beat too fast, usually at a rate of about 120 to 200 beats per minute. Ventricular tachycardia is a type of arrhythmia (abnormal heart...