When the source of the fast heart rhythm is the lower chambers (ventricles), ventricular tachycardia (VT) is present. It is also rarely seen in children with otherwise normal hearts, often occurring in families. This tachycardia may be seen in patients who have had recent surgery involving this area, for example repair of a ventricular septal defect (VSD), atrioventricular septal defect or tetralogy of Fallot. The origin of the tachycardia is the "junction" between the upper and lower chambers. This results in the most common form of fast arrhythmias in adolescence. There can be two pathways within the AV node which allows a circuit within it. It is the only area that normally allows the electrical activity of the heart to pass from the upper chambers to the lower chambers. The atrio-ventricular node (A-V node) is located between the upper and lower chambers of the heart.
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