What term describes abnormal heart rhythms?

The term that describes abnormal heart rhythms is "arrhythmias." This encompasses a broad category of heart rhythm disorders, which can include a variety of conditions where the heartbeat is too fast, too slow, or irregular. Arrhythmias can arise from issues in the heart's electrical conduction system, leading to variations in the heart rate or rhythm.

Bradycardia refers specifically to a slow heart rate, which is one type of arrhythmia. Tachycardia pertains to a fast heart rate, which is another form of arrhythmia. Flutter typically refers to atrial flutter, a specific type of arrhythmia characterized by rapid, organized electrical activity in the atria of the heart. While all these terms relate to heart rhythms, "arrhythmias" is the most comprehensive term, encompassing all types of abnormal rhythms.