Atrial fibrillation is an irregular heart rhythm that affects the normal contraction of the right and left atria. The atria lose their normal ability to contract and essentially "quiver". It may occur in association with valvular heart disease or other heart problems or it may occur in a normal heart. Over two million people in the United States have atrial fibrillation.
The diagnosis of atrial fibrillation is usually made on the electrocardiogram. For patients who have atrial fibrillation that comes and goes and is not seen on a single electrocardiogram, outpatient monitoring may be performed.
Many different classifications of atrial fibrillation have been proposed, but the most common system describes three categories:
For paroxysmal and persistent atrial fibrillation, if the patient has two or more episodes it is called recurrent paroxysmal or recurrent persistent atrial fibrillation.
and rhythm control
The medical treatment for atrial fibrillation is complex and there have been many different approaches for controlling the heart rate or rhythm or both, and these also are determined by the category of atrial fibrillation (paroxysmal, persistent, or permanent) and whether or not the episodes are recurrent. In certain instances where the atrial fibrillation is not yet permanent, an electrical shock known as cardioversion may be applied to break the atrial fibrillation and restore a regular rhythm.
In some patients where the rate cannot be controlled with medication, the electrical conduction system of the heart can be interrupted with a procedure known as a nodal ablation. Although the atria continue to fibrillate, the electrical impulses are not conducted to the ventricles, and the heart rate slows down significantly. Because the heart rate gets very low, a patient having a nodal ablation will usually require a pacemaker. You must be very careful not to confuse nodal ablation with atrial fibrillation ablation; it is unfortunate that the word “ablation” is used with both procedures, because it does confuse things.
The other major goal of medical treatment is to prevent blood clots from forming and breaking loose, and this is done with blood thinners such as warfarin. Some patients cannot take warfarin, and this can be a serious problem. In addition, taking warfarin can cause bleeding problems, especially if the patient has another problem such as a fall or an ulcer. Patients on warfarin must have their blood checked regularly to make sure it is not too thick or too thin. If the patient must have a surgical procedure performed, the warfarin must be stopped in advance, and this places the patient at risk.