Atrial fibrillation (AF or afib) is a
cardiac arrhythmia (abnormal heart rhythm) that involves the
two upper chambers (atria) of the
heart. It is defined as being irregularly irregular, and can often be identified as such when taking a
pulse. Atrial fibrillation is the most common arrhythmia; risk increases with age, with 8% of people over 80 having AF. In atrial fibrillation, the electrical impulses that are normally generated by the
sinoatrial node are replaced by disorganized activity in the atria, leading to irregular conduction of impulses to the
ventricles that generate the heartbeat. The result is an irregular heartbeat. This may be continuous (persistent or permanent AF) or alternating between periods of a normal heart rhythm (paroxysmal AF). The natural tendency of atrial fibrillation is to become a chronic condition. Chronic AF leads to an increased risk of death.
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Abnormal irregular heart rhythm with chaotic generation of electrical signals in the atria of the heart. Familiarly called atrial fib.
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