News tagged with atrial fibrillation

Related topics: stroke · heart failure · heart · patients · heart attack

New way to prevent some strokes discovered

Larry Ambrose was diagnosed as having a stroke a few days after he woke up one night, wandered into his kitchen and couldn't read the time on his microwave. Ambrose, like 25 percent of all stroke patients, experienced a cryptogenic ...

Jun 25, 2014
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Guidelines issued for stroke prevention in women

(HealthDay)—New guidelines have been released that highlight unique stroke risk factors for women and address prevention strategies, according to a synopsis article published in the June 17 issue of the Annals of Internal ...

Jun 17, 2014
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Atrial fibrillation

Atrial fibrillation (AF or afib) is the most common cardiac arrhythmia (abnormal heart rhythm) and involves the two upper chambers (atria) of the heart. Its name comes from the fibrillating (i.e. quivering) of the heart muscles of the atria, instead of a coordinated contraction. It can often be identified by taking a pulse and observing that the heartbeats don't occur at regular intervals. However, a conclusive indication of AF is the absence of P waves on an electrocardiogram (ECG), which are normally present when there is a coordinated atrial contraction at the beginning of each heart beat. Risk increases with age, with 8% of people over 80 having AF.

In AF, the normal electrical impulses that are generated by the sinoatrial node are overwhelmed by disorganized electrical impulses that originate in the atria and pulmonary veins, leading to conduction of irregular impulses to the ventricles that generate the heartbeat. The result is an irregular heartbeat which may occur in episodes lasting from minutes to weeks, or it could occur all the time for years. The natural tendency of AF is to become a chronic condition. Chronic AF leads to a small increase in the risk of death.

Atrial fibrillation is often asymptomatic, and is not in itself generally life-threatening, but may result in palpitations, fainting, chest pain, or congestive heart failure. People with AF usually have a significantly increased risk of stroke (up to 7 times that of the general population). Stroke risk increases during AF because blood may pool and form clots in the poorly contracting atria and especially in the left atrial appendage (LAA). The level of increased risk of stroke depends on the number of additional risk factors. If a person with AF has none, the risk of stroke is similar to that of the general population. However, many people with AF do have additional risk factors and AF is a leading cause of stroke.

Atrial fibrillation may be treated with medications which either slow the heart rate or revert the heart rhythm back to normal. Synchronized electrical cardioversion may also be used to convert AF to a normal heart rhythm. Surgical and catheter-based therapies may also be used to prevent recurrence of AF in certain individuals. People with AF are often given anticoagulants such as warfarin to protect them from stroke.

This text uses material from Wikipedia, licensed under CC BY-SA

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