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 ...

AFib (short for atrial fibrillation), a common heart rhythm disorder in adults, can have disastrous consequences, including life-threatening blood clots and stroke if left undetected or untreated. A ...