Atrial Flutter
- Atrial Flutter Overview
- Atrial Flutter Causes
- Atrial Flutter Symptoms
- When to Seek Medical Care
- Exams and Tests
- Atrial Flutter Treatment
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Atrial Flutter Overview
Atrial flutter is an abnormality of the heart rhythm, resulting in a rapid and sometimes irregular heartbeat. Such abnormalities, whether in the rate or regularity of the heartbeat, are known as arrhythmias.
The beating of the heart is controlled by electrical impulses.
- Under normal circumstances, these impulses are generated by the heart's
natural pacemaker, the sinoatrial (SA) or sinus node, which is located in the
right atrium.
- The impulse travels across the atria, generating a contraction of the
atria.
- The impulse pauses very briefly at the atrioventricular (AV) node, which is
located in the upper part of the muscular wall between the two ventricles. This
delay gives the blood time to move from the atria to the ventricles.
- The impulse then moves down and through the ventricles, generating the ventricular contraction, which pumps the blood out of the ventricles.
Atrial flutter occurs when these electrical impulses take an abnormal path through the atria, typically circulating around the tricuspid valve in the right atrium.
- The abnormal path of the impulses makes the atria contract very rapidly,
typically about 250-350 beats per minute. The normal heart rate is 50-100 beats
per minute.
- These rapid contractions are slowed when they reach the AV node often with
every second or third contraction reaching the ventricle.
- The heart beats in a regular rhythm, but it beats rapidly.
- This type of rhythm is called tachycardia (rapid heartbeat). Because atrial flutter comes from the atria, it is sometimes called a supraventricular (above the ventricles) tachycardia.
Atrial flutter can come and go; it is then known as paroxysmal atrial flutter. More often, atrial flutter lasts for days to weeks and is known as persistent atrial flutter.
With proper treatment, atrial flutter is rarely life- threatening. Complications of atrial flutter, in particular stroke, can be devastating, but they can be prevented with medications ("blood thinners") such as warfarin (Coumadin).
Next: Atrial Flutter Causes »
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Atrial Flutter »
Atrial flutter has many clinical aspects that are similar to atrial fibrillation (ie, underlying disease, predisposing factors, complications, medical management).
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