The common types of heart rhythm disturbances are:

Atrial Fibrillation

Atrial fibrillation, sometimes referred to as AF, is a specific heart rhythm disturbance that is caused by chaotic electrical activity in the upper chambers (atria) of the heart.
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Atrial Flutter

This rhythm is closely related to atrial fibrillation and can carry the same increase in stroke risk. However, in contrast to the chaotic activity in AF, flutter is caused by a single short circuit usually in the top right chamber of the heart.
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Supra Ventricular Tachycardia

SVT is a rhythm disturbance that originates from the upper chambers of the heart (the atria) and is responsible for palpitations. It is usually caused by an extra bit of heart muscle that acts as a conducting circuit within the heart.
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Ventricular Tachycardia

VT is a rhythm disturbance that originates from the lower chambers of the heart (the ventricles). This rhythm disturbance is usually caused by some underlying heart disease such as previous heart attacks, heart failure or inherited heart conditions.
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