Catheter ablation is an established curative treatment for accessory pathways (APs), but in spite of the great progress made in the diagnosis and treatment, there is limited knowledge of the underlying cellular pathophysiology that determines the different clinical presentations. The case presented highlights the complex presentation and properties of some APs that can be encountered at the tim...

In this study we sought to determine whether characteristics of ventricular-induced atrial preexcitation during reciprocating tachycardia could help differentiate atrioventricular (AV) nodal reentry from orthodromic AV reentry using an accessory pathway and to identify the site of accessory pathways in patients with Wolff-Parkinson-White syndrome. Fifty-five patients with orthodromic AV recipro...

An unusual patient with Ebstein's anomaly of the tricuspid valve and the Wolff-Parkinson-White syndrome is presented. Ventricular pre-excitation related to conduction over both a right posterior Kent bundle and Mahaim fibers coursing from the atrioventricular node to the right ventricle. Two types of supraventricular tachycardia were demonstrable. These were due to re-entry involving antegrade ...

Sequence of retrograde atrial activation is not a reliable criterion for the classification of atrioventricular nodal re-entrant tachycardia (AVNRT) into typical and atypical types. The conventional concept of a lower common pathway is not supported by current evidence and does not represent a reliable or reproducible criterion. The distinction between 'fast-slow' and 'slow-slow' forms is not u...

We describe a case of a young man referred with a broad complex tachycardia for evaluation and ablation. Electrophysiological study was performed and revealed a left lateral accessory pathway with antegrade decremental conduction causing antidromic reciprocating re-entrant tachycardia. Ablation was successfully performed. Left lateral accessory pathways with decremental conduction are rarely en...

Background. The developmental mechanisms underlying the

this study was conducted on the atrioventricular node (avn) and atrioventricular bundle (avb) of fivefour-month-old ovine fetuses. the histological structure of these components was studied by routinehistological techniques and use of specific staining methods. the avn was caudally located adjacent to theroot of the aorta. it was almost spherical in shape and consisted of twisty cells. the node...

Two cases with a concealed left-sided accessory atrioventricular bypass tract are described. In both, functional longitudinal dissociation of the atrioventricular node narrowed the range of atrial premature beat coupling intervals which could initiate re-entry using the accessory pathway. In case 1 early premature atrial beats were followed by an atrioventricular nodal re-entrant echo. The atri...

It is important to recognise Wolff-Parkinson-White (WPW) syndrome in electrocardiograms (ECG), as it may mimic ischaemic heart disease, ventricular hypertrophy and bundle branch block. In addition, ECG can aid in the localisation of the accessory pathway. Recognising WPW syndrome allows for risk stratification, the identification of associated conditions and the institution of appropriate manag...

Radiofrequency (RF) catheter ablation became first-line therapy for supraventricular tachycardia in patients with Wolff-Parkinson-White syndrome1–5 and atrioventricular (AV) nodal reentrant tachycardia (AVNRT)6–11 in the early 1990s. High ablation success ( 90%) and low complication rates ( 5%) were found by numerous investigators.1–11 This article describes these ablation techniques with a foc...