<unk>  <unk>  is a rare type of cardiac arrhythmia within the category of supraventricular tachycardia (SVT).<unk>  may be caused by the<unk>  node itself having an abnormal structure or function, or it may be part of a problem called dysautonomia, a disturbance and/or failure of the autonomic nervous system. Research into the mechanism and etiology (cause) of<unk>  is ongoing.<unk>  is viewed by most to be a benign condition in the long-term. Symptoms of<unk> , however, may be distracting and warrant treatment. The heart is a strong muscle and typically can sustain the higher-than-normal heart rhythm, though monitoring the condition is generally recommended. The mechanism and primary etiology of<unk>  has not been fully elucidated. An autoimmune mechanism has been suggested, as several studies have detected autoantibodies that activate beta adrenoreceptors in some patients. The mechanism of the arrhythmia primarily involves the<unk>  node and peri-nodal tissue and does not require the AV node for maintenance. Treatments in the form of pharmacological therapy or catheter ablation are available, but the condition is currently difficult to treat successfully.
Inappropriate sinus tachycardia
Ventricular escape beat
AV nodal reentrant tachycardia
Junctional ectopic tachycardia
Sinoatrial arrest
Junctional tachycardia
Second-degree atrioventricular block
Wandering atrial pacemaker