PACs and PVCs are usually harmless but can sometimes indicate underlying heart disease. Atrial fibrillation (AFib) is common and originates within the atria, causing them to "quiver" or fibrillate.

Patients requiring a pacemaker often have atrial fibrillation (AF), which increases ... including premature atrial contractions (PACs), believed to be a primary inducer of AF.

The study is geared toward patients with atrial fibrillation, or AFib, the most common type of heart arrhythmia. The condition is characterized by fast and regular heartbeats from the atria ...

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 ...

There are four main characteristics of PACs: Premature, occurring earlier than expected if measured against previous P-P intervals. Ectopic, originating outside of the SA node, and thus ...