<unk>  is an abnormal heart rhythm that occurs in the<unk> of the heart.  When it first occurs, it is usually associated with a fast heart rate or tachycardia, and falls into the category of supra-ventricular tachycardias.  While this rhythm occurs most often in individuals with cardiovascular disease (eg: hypertension, coronary artery disease, and cardiomyopathy), it may occur spontaneously in people with otherwise normal hearts.  It is typically not a stable rhythm, and frequently degenerates into<unk>  fibrillation.  However, it does rarely persist for months to years.
Atrial flutter
Ventricular flutter
Sinus arrhythmia
Wide complex tachycardia
Lone atrial fibrillation
Narrow complex tachycardia
Fascicular VT
Atrioventricular dissociation