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Atrial Fibrillation

What Is It?

Published: July, 2019

Atrial fibrillation is a heart rhythm disorder that causes a rapid and irregular heartbeat.

The heart is a muscle that has four chambers through which blood flows. The two upper chambers are the atria. The two lower chambers are the ventricles.

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Atrial Fibrillation

What Is It?

Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.

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