Atrial Fibrillation – Causes

Atrial Fibrillation – Causes 

 

 

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Atrial Fibrillation – Causes 

Normally, blood that contains no oxygen is pumped into the top chamber of the heart, the right atrium, this contracts and sends blood into the right ventricle. The blood is pumped out of the heart and to the lungs where it picks up oxygen so it can be sent to the rest of the body. The atria then relaxes so it can be filled with blood again

During atrial fibrillation the atria contract randomly and very quickly, sometimes too quickly to be filled with blood.

Atrial fibrillation occurs when the control mechanism of the heart breaks down. The Sino atrial node normally sends controlled electrical impulses through the heart that cause contractions, in atrial fibrillation this sends abnormal impulses causing the heart to contract inappropriately. Although the exact cause of atrial fibrillation is unknown it tends to effect those over 65 years of age. Drinking too much and smoking are thought to increase the risk of atrial fibrillation.