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 ...

Atrial fibrillation (AFib) is the most common form of irregular heartbeat (arrhythmia). People with AFib have many treatment options, including medications and medical procedures. However ...