SINCE their introduction by Lopez and coworkers,' paired electrical stimulation and coupled pacing of the heart have been investigated intensively and have been shown to be useful in slowing the effective mechanical rate of the heart or in causing sustained potentiation of cardiac contraction or for both. A recent symposium on this subject provides an excellent review.2 The techniques, in essen...

BACKGROUND Septal accessory atrioventricular (AV) pathways may be located in close vicinity of the His bundle-AV nodal conduction system. Attempts at surgical or electrical interruption of these pathways may therefore result in impairment of normal AV conduction. This study focuses on a subset of septal pathways with an atrial insertion located inside the triangle of Koch. In this study, they w...

A lthough cardiac pacemakers have a proved place in the treatment of chronic heart block,1,2 there have been some differences of opinion regarding the efficacy of artificial pacing in heart block complicating acute myocardial infarction. Second degree atrioventricular (A-V) block can be divided into type I (Wenckebach) and type II ( ‘sI bjt ) . The former is the type usually associated with inf...

was demonstrated in five patients by using programmed atrial stimulation and His bundle recordings. Entrance block into the A-V node occurred in a narrow range (28-33%) of the basic cycle length and concealed conduction occurred at coupling intervals longer than this range. It appears that entrance block of these early APBs is due to a "functional block" between the atrium and the A-V node. The...

Background. Septal accessory atrioventricular (AV) pathways may be located in close vicinity of the His bundle-AV nodal conduction system. Attempts at surgical or electrical interruption of these pathways may therefore result in impairment of normal AV conduction. This study focuses on a subset of septal pathways with an atrial insertion located inside the triangle of Koch. In this study, they ...

BACKGROUND This study describes the use of adenosine during ablation procedures to allow conduction through adenosine-dependent accessory pathways (APs), which are inactive at the time of the procedure. The technique allows for successful mapping and ablation of these pathways. METHODS Retrospective review of all patients undergoing AP ablation from 1998 to 2008 to identify patients with abse...

the conduction of premature responses has resulted from the precise and degwtff W@kW& by Langendorf, a n d K a t z a n d P i cardiograms of patients with arrhythmias. The elaborate associates on experimentally evoked arrhythmias have further increased our knowledge of conduction of premature responses. Recently, Moe et al. demonstrated that as many as six premature atrial responses can be conce...

Both supraventricular or ventricular mechanisms of bidirectional VT (BVT) have been proposed in the past, involving either focal or reentrant mechanisms.(Levy 1989) A supraventricular mechanism with alternating LAFB and LPFB(Rosenbaum 1969)was largely excluded with the advent of intracardiac recordings, which failed to show a His bundle potential preceding the alternating QRS complexes during B...