#irregular heartbeat
- Arrhythmia — A disruption of the normal heart rhythm, characterized by an alteration in the frequency, regularity, or sequence of cardiac contractions. This structural and electrophysiological anomaly occurs when the electrical impulses that coordinate heartbeats do not function properly, causing the heart to beat too fast (tachycardia), too slow (bradycardia), or completely irregularly (such as atrial fibrillation).