If the athlete is known for certain to have been in atrial fibrillation for less than 48 h, the athlete can be cardioverted promptly without prolonged systemic anticoagulation. Left atrial thrombus ...

It beats around 60-100 times per minute when you're resting. If you have atrial fibrillation, though, your heart can beat out of rhythm, too fast, or too slow. Untreated AFib might also make you ...