I hate googling medical stuff so may i ask what the symptoms are?
The symptoms of Afib (Artial Fibrillation)?
You generally have two main types; Paroxsymal Afib and Persistent Afib.
Paroxsymal means that you get an irregular heartbeat which comes and goes from time to time, persistent means you have a permanent irregular heartbeat.
Put simply, the upper Atrial chambers of the heart fill with blood and then pass that blood down to the lower Ventrical chambers to be pumped around the body. The rhythm of both of these areas of the heart are controlled internally by their own nodes.
In Afib, the upper chambers are receiving disruptive electrical impulses from an external source, i.e. through a vein or such like, and are more or less fluttering rather than beating in time to the lower chambers.
The symptoms, other than feeling your pulse and seeing it's not regular or sometimes feeling like your heart is trying to beat it's way out of your chest cavity, are that you feel tired a lot more easily, you get pain in the chest and sometimes the arm too - which is scary as those are the symptoms of a pending heart attack. If you get those symptoms get to A&E pronto!
I have persistent Afib and I could best describe my symptoms as to like being at altitude - if you have ever been up a mountain, skiing for instance, then you will know that the thinner air makes even walking up the stairs more difficult. From what I read Afib causes the heart to be between 10-20% less efficient.