Page 468 - ECG dr shamol_Slide

AV re-entry tachycardia:
It is because of bypass tract (accessory pathway), i.e. an abnormal cardiac muscle

connects the atria and the ventricles bypassing the AV node. From here the

impulse passes down through normal conducting system (i.e. AV node bundle
of His) into the ventricles, recycles rapidly by the bypass tract to the atria.