Differences While atrial flutter and atrial fibrillation are each conditions that involve the atria (the heart's upper chambers), there are some differences between the two conditions.

But there are very important differences between atrial fibrillation and atrial flutter -- both in terms of the precise mechanism of the arrhythmia, but also how they're treated.

Atrial flutter is similar to another type of arrhythmia called atrial fibrillation (AFib). Both start in the upper chambers of the heart and cause a fast heartbeat and increase your risk of stroke.

Atrial flutter is a disorder which causes the heart to beat out of its normal rhythm. Learn more here.

New-onset atrial fibrillation and atrial flutter are as common in hospitalized patients with influenza as with COVID-19, suggesting the connection between the arrhythmias and COVID-19 is related ...

Jim Harbaugh briefly left the Chargers vs. Broncos game in Week 6 because of a heart condition. Here's what to know about atrial flutter.

Atrial flutter is a type of abnormal heart rate. It occurs when the upper chambers of your heart beat too fast.