Arrhythmia and dysrhythmia are terms that both describe an abnormal heart rate or rhythm, with arrhythmia being the more commonly used term. An abnormal heart rate can be either faster (tachycardia) ...

An arrhythmia is an irregular heartbeat. An arrhythmia may feel like a racing heart or fluttering. It is not always serious but can sometimes indicate a potentially fatal heart problem. Arrhythmias — ...

Arrhythmias are irregularities in the heart’s rhythm, such as beating too fast, too slow, or erratically. While some are harmless, others can lead to organ damage or be life threatening. Various ...