Different types of arrhythmias are grouped under this name. They share several characteristics, including catheter ablation as their initial treatment of choice given that success rates for complete elimination of the arrhythmia are higher than 90% without the need for long-term medical treatment.
Among them, intranodal tachycardia or AVNRT (atrio-ventricular nodal reentrant tachycardia) and atrio-ventricular reentrant tachycardia mediated by an accessory pathway (Wolff-Parkinson-White syndrome), are characterized by repeated episodes of fast and regular heart palpitations of sudden onset. These are typical in young and middle-aged adults. Atrial tachycardia and atrial flutter are also grouped under this category.