BACKGROUND We sought to investigate the feasibility of radiofrequency catheter ablation of atrioventricular node reentrant tachycardia and the ideal site for slow pathway (SP) ablation in congenitally corrected transposition of the great arteries. METHODS AND RESULTS Nine patients with congenitally corrected transposition of the great arteries referred for catheter ablation of atrioventricula...

Continuation of the left anterior descending to form the posterior descending artery is rarely observed. We describe the first patient with this variant in whom the coronary artery extends beyond the crux, supplying branches to the atrioventricular node and both atrioventricular grooves.

BACKGROUND Several transcription factors regulate cardiac conduction system (CCS) development and function but the role of each in specifying distinct CCS components remains unclear. GATA-binding factor 6 (GATA6) is a zinc-finger transcription factor that is critical for patterning the cardiovascular system. However, the role of GATA6 in the embryonic heart and CCS has never been shown. METHO...

TRAXSMEMBRANE recording from single fibers of the atrioventricular (A-V) node of the rabbit heart has shown action potentials exhibiting rising phases with a much slower time course than those of plain heart muscle.' It has also been shown that the area in which such nodal potentials are recorded is not sharply delimited, regions being found at each side of the nodal area in which action potent...

Introduction Unroofed coronary sinus is a rare congenital anomaly that may alter the complex anatomy of the atrioventricular (AV) node. Arrhythmia circuits occurring among these patients may not be located in the usual position, especially those circuits involving the AV node. We report a case of the coexistence of this uncommon coronary sinus (CS) anomaly and the atypical form of atrioventricu...

observed that the sinus wave reached the AV node with a Introduction Atrioventricular septal defect (AVSD) can be associated with supraventricular arrhythmias and atrial fibrillation (AF). The position of the conduction system differs from the normal heart: the atrioventricular (AV) node is more posterior and inferior compared with the normal position in the triangle of Koch, in close relation ...

To evaluate the role of perinodal tissue in the genesis of atrioventricular (AV) nodal reentry, echo beats were induced by programmed stimulation in nine superfused rabbit atrial-atrioventricular nodal preparations. In these preparations, extracellular bipolar electrograms were recorded simultaneously from the crista terminalis, interatrial septum arid His bundle, along with microelectrode acti...

We have read with interest the article by Dr. Moriña et al1 describing their initial experience with implantation of active fixation electrodes in the His bundle for permanent ventricular stimulation following ablation of the AV node. Their results are interesting as they establish stimulation threshold parameters and stable echocardiography measures after only a few months followup. Neverthele...