Atrial fibrillation, or AFib, is the most common heart rhythm disorder. With AFib, the beating of the upper chambers of your heart (the atria) becomes irregular, and blood has a harder time reaching ...

Atrial fibrillation happens most often in older adults and in people with other heart problems. But it also affects younger people. Roughly 800,000 Americans under age 40 have atrial fibrillation, ...

Cryoablation uses extreme cold to destroy heart tissue that causes an irregular heartbeat, intending to restore a regular heart rhythm. Doctors may suggest cryoablation if other treatments do not work ...