Types of Arrhythmia

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Bradyarrhythmias are arrhythmias in which the heart rate is slower than normal. If the heart rate is too slow, not enough blood reaches the brain, and the person can lose consciousness. In adults, a heart rate slower than 60 beats per minute is considered a bradyarrhythmia. Some people normally have slow heart rates, especially people who are very physically fit.
Ventricular Arrhythmias
Ventricular tachycardia is a fast, regular beating of the ventricles that may last for only a few seconds or for much longer. A few beats of ventricular tachycardia often don’t cause problems, but ventricular tachycardia episodes that last for more than just a few seconds can be dangerous. Ventricular tachycardia can turn into other, more dangerous arrhythmias, such as v-fib.
Supraventricular Arrhythmias
Supraventricular arrhythmias are tachycardias (fast heart rates) that start in the atria or the atrioventricular node (cells located between the atria and the ventricles).
Premature (extra) Beats
In most cases, premature beats occur naturally, not due to any heart disease. But certain heart diseases can cause premature beats. They also can happen because of stress, too much exercise, or too much caffeine or nicotine.
Wolff-Parkinson-White (WPW) syndrome
Paroxysmal Supraventricular Tachycardia
Atrial Flutter
Atrial Fibrillation
Ventricular Fibrillation
Ventricular Tachycardia
Source: U.S. Department of Health and Human Services, National Institutes of Health, National Heart Lung and Blood Institute. nhbi.nih.gov.
Types of Arrhythmia