What is difference between arrhythmia and atrial fibrillation?

An arrhythmia is when the heart beats too slowly, too fast, or in an irregular way. When a person has AFib, the normal beating in the upper chambers of the heart (the two atria) is irregular, and blood doesn’t flow as well as it should from the atria to the lower chambers of the heart (the two ventricles).

Ventricular fibrillation is most commonly caused by the following:

Atrial fibrillation and ventricular fibrillation are caused by similar problems with the heart , but they are not the same type of problem. Electrical impulses generated within the heart tissue cause both heart conditions, but the electrical impulses arise in different areas of the heart.

Ventricular fibrillation is more serious than atrial fibrillation . Ventricular fibrillation frequently results in loss of consciousness and death, because ventricular arrhythmias are more likely to interrupt the pumping of blood, or undermine the heart’s ability to supply the body with oxygen-rich blood.