In This Section Texas Health Cleburne Atrial
fibrillation/flutter is a heart rhythm disorder (arrhythmia). It
usually involves a rapid heart rate that is not regular.
Auricular fibrillation; A-fib Causes, incidence, and risk
factors: Arrhythmias are caused by problems with the heart's
normal electrical conduction system. Normally, the four chambers
of the heart (two atria and two ventricles) contract (squeeze)
in an orderly way. When this happens, your heart is able to pump
the blood your body needs without working any harder than it
needs to. The electrial impulse that signals your heart to
contract begins in the sinoatrial node (also called the sinus
node or SA node). This node is your heart's natural pacemaker. -
The signal leaves the SA node and travels through the two upper
chambers (atria). - Then the signal passes through another node
(the AV node), and finally, through the lower chambers
(ventricles). In atrial fibrillation, the electrical impulse of
the heart is not regular. The atria are contracting