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.

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.

Jim Harbaugh heart condition Harbaugh has what's called an atrial flutter, which is a type of arrhythmia that causes the heart to beat at an abnormally high rate.

A trial of a gold-tipped contact force-sensing catheter for treatment of patients with atrial flutter met its primary endpoints, researchers reported at AF Symposium. For the prospective ...

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.