<unk>  is a commonly encountered variation of normal<unk>  rhythm.<unk>  characteristically presents with an irregular rate in which the variation in the R-R interval is greater than 0.12 seconds. Additionally, P waves are typically mono-form and in a pattern consistent with atrial activation originating from the<unk>  node. During respiration, the intermittent vagus nerve activation occurs, which results in beat to beat variations in the resting heart rate. During inspiration the heart rate goes up (being maximal at the peak of inspiration), while during expiration, the heart rate goes down, being slowest at end-inspiration. When present,<unk>  typically indicates good cardiovascular health.
Sinus arrhythmia
Ventricular flutter
Ventricular tachycardia
Junctional tachycardia
Sinus tachycardia
Atrial flutter
Supraventricular tachycardia
Re-entry ventricular arrhythmia