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The heart has four chambers: a left and right atrium above a left and right ventricle. During each cardiac cycle, the atria contract before the ventricles. Coordination of these contractions is made possible by an electrical system. The heart has conductive tissue through which electrical impulses travel and stimulation the cardiac muscle.
Atrial fibrillation ("a-fib") is a heart rhythm abnormality in which the atria do not contract well. On an EKG [link widoczny dla zalogowanych], the cardiac cycle still has a QRS complex and T wave [link widoczny dla zalogowanych], but a distinct P wave is absent. Instead, the segment before the QRS is typically wavy in an irregular fashion..
In the right atrium is the sinus node, the heart's natural pacemaker that constantly sends out electrical signals on its own. These signals travel through the atria, causing them to contract. The impulses also reach the atrioventricular node between the atria and ventricles. An electrical pathway called the bundle of His travels from the AV node and branch off into fibers that stimulate contraction of the ventricles.
The heart actually has additional pacemakers throughout the atria and the ventricles. Normally, they do not fire signals because the sinus node from above is already doing so. However, if the sinus node were to fail, the next pacemaker below can take over. While these electrical foci can act as backup, they are not a perfect substitute for the sinus node.
Among the various abnormal heart rhythms, atrial fibrillation is one of the most common. About two million people in the United States are affected by this condition. Treatment for atrial fibrillation does exist, but one must understand the condition to manage it in the best way possible.
On an electrocardiogram (EKG) [link widoczny dla zalogowanych], the cardiac cycle in a normal heart is represented as three upright waves: a P wave, a taller peak called the QRS complex, and a third wave called the T wave. By comparing an EKG to this normal pattern, clinicians can detect abnormalities in heart rate and rhythm, including atrial fibrillation.
Normal Electrophysiology
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