Three patients with paroxysmal supraventricular tachycardia (PSVT) had discontinuous ventriculo-artrial conduction curves (V1-V2, A1-A2), suggesting dual A-V nodal pathways. Ventricular echoes occurred simultaneously with sudden increase of V-A interval. These echoes were characterized by retrograde P waves occurring in front of QRS, suggesting utilization of a slow pathway for retrograde condu...

AIM/DESIGN A concept analysis of concealed pregnancy was undertaken using Walker and Avant's framework to examine the attributes, characteristics and uses of the concept in maternity care. BACKGROUND Understanding the concept of concealed pregnancy is critical as failing to do so adds the risk of maternal and neonatal morbidity and mortality. Reviewing the literature and selected empirical re...

BACKGROUND The presence of junctional rhythm has been considered to be a sensitive marker of successful slow-pathway ablation. However, in rare cases, junctional rhythm was absent despite multiple radiofrequency applications delivered over a large area in the Koch's triangle, and successful ablation was achieved in the absence of a junctional rhythm. METHODS AND RESULTS This study included 35...

Abstract Background Cardiac inflammation driven by the Toll-Like-Receptor 4 (TLR4) is correlated to increased risk of arrhythmia. arrhythmogenesis and formation re-entry tachycardia highly dependent on conduction velocity (CV) action potential (AP) duration (APD). As TLR4 induced APD shortening has been shown, we analyze in this study for first time effect conductance disturbances a LPS septic ...

Electrophysiological findings suggest that concealed anterograde conduction through accessory pathways may exist even during sinus rhythm in patients with so-called concealed Wolff-Parkinson-White (WPW) syndrome. To evaluate the pre-excitation characteristics in various types of WPW syndrome, high-resolution electrocardiograms were analyzed in 81 consecutive WPW syndrome patients and 50 age-mat...

Background Residual slow pathway conduction in the form of persistent jump in the atrioventricular (AV) conduction time or atrial echo beats is a common finding after successful radiofrequency (RF) ablation of the slow pathway in patients with AV nodal reentrant tachycardia (AVNRT). Sites of successful RF ablation of the slow pathway may be located anteriorly in the tricuspid annulus (cephalad ...