slow pathway

slow pathway

Cardiology An anomalous conduction pathway in the heart which has no known functions; the SP provides the antegrade limb of a reentry circuit in atrioventricular nodal reentrant tachycardia–AVNRT–the fast pathway provides the retrograde limb–the 'slow-fast' or common form of AVNRT; selective catheter ablation of the atrial end of the SP eliminates AVNRT with little risk of AV block
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AVJRT can be due to atrioventricular nodal re-entrant tachycardia (AVNRT), where the antegrade limb is the slow pathway of the atrioventricular (AV) node and the retrograde limb the fast pathway, or atrioventricular re-entrant tachycardia (AVRT), where the antegrade limb is the AV node and the retrograde limb is the accessory pathway ('orthodromic' AVRT).
If the SVT starts with a very long PR interval at the onset of the tachycardia, the clinician should diagnose AVNRT with antegrade slow pathway conduction accounting for the prolonged PR interval.
This pattern suggests antegrade conduction down the fast pathway and retrograde conduction up the slow pathway in someone with dual A-V nodal pathways.
Which parameters describe the electrophysiological properties of successful slow pathway RF ablation in patients with common atrioventricular nodal reentrant tachycardia?
The aim of our study was describe the electrophysiological properties of successful slow pathway RF ablation in patients with common atrioventricular nodal reentrant tachycardia.
A 24-hour ambulatory ECG recorded during the same admission also showed a striking transient increase in the P-R interval following a couplet of ventricular premature complexes (Figure 2), again suggesting the presence of dual A-V nodal pathways with the fast pathway having a longer refractory period than the slow pathway, as is usually the case.
Dual A-V nodal pathways typically come to medical attention when a patient presents with A-V nodal reentrant tachycardia, which most often begins with an atrial premature complex that blocks in the fast pathway, is conducted down the slow pathway, and then returns retrogradely up the fast pathway that is no longer refractory.
Cryothermal ablation of the slow pathway for the elimination of atrioventricular nodal reentrant tachycardia.
It may conduct down the slow pathway, which has a shorter refractory period, and reach the ventricles with a long P-R interval.
The works involve the construction of a branch line to connect the A-3 to fast track the V-30, so that the independence between the fast and slow pathways V-30 South is maintained between P.