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Atrial Fibrillation

What is Atrial Fibrillation?

 
 
Normal Sinus Rhythm
 
 
Tachycardia

Atrial Fibrillation is one of the most common heart rhythm disorders caused by a problem in the electrical conduction system of the heart.  Normally, electrical impulses begin in the upper chambers of the heart (the atria) and are then conducted through ‘wiring” into the main pumping muscles (the ventricles). The electrical impulse originates in the sinoatrial node (SA) of the right atrium which travels through the atrioventricular (AV) node into the ventricle to trigger a coordinated contraction of all the heart chambers.  This is commonly referred to as normal sinus rhythm (NSR).

In patients with atrial fibrillation, the electrical impulse begins in multiple regions at creating chaotic electrical impulses that cause the “atria to fibrillate” and will typically produce fast irregular heart rates and beats (Tachycardia). Afib can be diagnosed using an electrocardiogram (EKG) which demonstrates the chaotic activity of afib when compared with normal sinus rhythm.

 

 

 

 

 

 

 

 

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Normal Sinus Rhythm


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Atrial Fibrillation

 

What are the symptoms of AF?

  • Fatigue

  • Sensation of irregular or fast heartbeat

  • Lightheadedness

  • Exercise intolerance

  • Vague chest discomfort

  • Heart Failure

  • Depression or Anxiety

Some people may not have any symptoms at all. In fact, many episodes of afib remain undetected and may only be an incidental finding in up 30–45% of patients who had an electrocardiogram for unrelated reasons.


Sources

Am J Cardiol 1994;74:236–41  and  Eur Heart J 2005;7:C5–11

 

Classification of Atrial Fibrillation

Once diagnosed with atrial fibrillation, your doctor may have classified you as either paroxysmal, persistent, or permanent based upon the American Heart Association Guidelines.

Paroxysmal Atrial Fibrillation

Intermittent periods of atrial fibrillation which usually terminate spontaneously and return to normal sinus rhythm. This type of AF can be difficult to diagnose because afib has to occur for an EKG heart monitor to document the occurrence. For this type of AF, ~ 90% of irregular electrical impulses are thought to initiate in the pulmonary veins, making surgical PV isolation the most effective treatment option available.


Persistent Atrial Fibrillation

Patients are in consistent AF and requires an intervention, (ie. Cardioversion) to be converted into normal sinus rhythm. Persistent AF usually means that there is self-sustaining mechanism for irregular electrical impulses within the heart structure.


Permanent Atrial Fibrillation

The atrial fibrillation cannot be successfully cardioverted to maintain normal sinus rhythm. Like Persistent AF, there is self-sustaining mechanism for irregular electrical impulses within the heart structure which make this refractory to medical therapy. Surgery has been one of the only viable options for treatment of Permanent AF.