Mechanism of<unk>  compared with other supraventricular arrhythmias Two distinct pathways are involved: the normal<unk>  conduction system, and an accessory pathway. During<unk> , the electrical signal passes in the normal manner from the AV node into the ventricles. Then, the electrical impulse pathologically passes back into the atria via the accessory pathway, causing atrial contraction, and returns to the AV node to complete the reentrant circuit (see figure). Once initiated, the cycle may continue causing the heart to beat faster than usual. Initiation of<unk>  may be through a premature impulse of atrial, junctional, or ventricular origin.
Atrioventricular reentrant tachycardia
AV nodal reentrant tachycardia  AV-nodal reentrant tachycardia  1
AV nodal reentrant tachycardia
Junctional ectopic tachycardia
Wandering atrial pacemaker
Re-entry ventricular arrhythmia
Pre-excitation syndrome
Sinoatrial arrest