<unk>  may be seen in young, healthy individuals as well as in the elderly and those with lung disease. The cause of<unk>  is unclear. There are factors that may play a role in its development though that leads to this rhythm being seen in young, healthy individuals as well as in the elderly and those with lung disease. Increased tone from the vagus nerve may factor into the rhythm appearing in young, healthy individuals who exercise. The vagus nerve is a part of the parasympathetic nervous system that helps control heart rate and contractility of the heart. Through exercise, there is increased input to the heart from the vagus nerve which causes the heart to beat at a slower rate. This is manifested by a lower resting heart rate than may be seen in the average person. For elderly individuals, the rhythm may be caused sinus node dysfunction. This is where the heart's<unk> , the SA node, has become damaged. For individuals with lung disease, the rhythm could be related to the underlying lung pathology. In rare cases, digoxin toxicity can cause<unk> .
Wandering atrial pacemaker
Junctional ectopic tachycardia
AV nodal reentrant tachycardia
Ventricular escape beat
Atrioventricular reentrant tachycardia
Ectopic pacemaker
Accelerated idioventricular rhythm
Re-entry ventricular arrhythmia