C atheter ablation for nonpharmacological management of pediatric patients with tachyarrhythmias has evolved during the past approximately 10 years. Direct-current energy ablation was initially used in some patients with drug-refractory, life-threatening tachyarrhythmias such as junctional ectopic-focus tachycardia and also for some children with left ventricular dysfunction due to incessant ta...

BACKGROUND Radiofrequency catheter ablation (RFCA) for atrial tachyarrhythmias in postoperative congenital heart disease (CHD) patients has a low success rate and a high recurrence rate. This study explores the reasons for these constraints. METHODS A total of 49 consecutive postoperative CHD patients who received RFCA for atrial tachyarrhythmias between 1993 and 2010 were enrolled. RESULTS...

INTRODUCTION The induction of atrial fibrillation (AF) by pulmonary vein (PV) ectopy is well described. The triggers for these PV ectopy are not so well understood. The intrinsic cardiac autonomic nervous system (ANS) has been suggested as a potential upstream regulator that may cause PV ectopy and atrial fibrillation (AF). We hypothesized that activation of the ANS by high frequency stimulatio...

INTRODUCTION AND OBJECTIVES The recent introduction of navigation systems has made substantial improvements in cardiac electrophysiological mapping. We present our experience with non-fluoroscopic electroanatomical mapping in patients with atrial tachycardias. PATIENTS AND METHOD We studied 24 consecutive patients with atrial tachycardias (10 of whom had undergone previous radiofrequency abla...

C atheter ablation for nonpharmacological management of pediatric patients with tachyarrhythmias has evolved during the past approximately 10 years. Direct-current energy ablation was initially used in some patients with drug-refractory, life-threatening tachyarrhythmias such as junctional ectopic-focus tachycardia and also for some children with left ventricular dysfunction due to incessant ta...

Transition from congenital junctional ectopic tachycardia to complete AV block was observed in an 8 month old girl, over a 36 hour period, during initial hospital admission. Two years later she had evidence of a rapidly increasing left ventricular end diastolic diameter, associated with lowest heart rates during sleep of < 30 beats/min. A transvenous permanent pacemaker was therefore implanted....

In the present report, A-V dissociation with concealed retrograde conduction into the A-V node, caused SINUS beats to exhibit antegrade A-V nodal conduction delay sufficient to result in episodes of supraventricular tachycardia (SVT). In this patient, atrial ectopic premature depolarizations were never observed. The primary role of A-V nodal conduction delay in the genesis of paroxysmal SVT is ...

BACKGROUND Recent reports suggest that adenosine, in addition to terminating supraventricular tachycardia involving the atrioventricular (AV) node, may have antiarrhythmic effects on atrial tachycardia. The electrophysiological effects of adenosine on supraventricular tissue include shortening of action potential duration in atrial myocytes mediated by the potassium current, IKACh,Ado; shorteni...

QUESTIONS Atrial ectopic tachycardia (AET) may be difficult to diagnose in neonates and treatment can be complex especially in case of severe heart failure. This study addresses the clinical recognition and drug therapy of AET in neonates. METHODS Retrospective chart and database review of neonates diagnosed with AET between 1994 and 2002. RESULTS AET was diagnosed in 19 neonates at a media...

15. Gutgesell HP, Gillette PC, McNamara DG: The response of the sinoatrial node to rapid atrial stimulation. Pediat Res 8: 350, 1974 16. Gillette PC, Mullins CE: Atrioventricular conduction in children: Response to rapid atrial stimulation and premature atrial stimulation. Cardiovasc Dis 2: 41, 1975 17. Godman MJ, Roberts NK, Izukawa T: Late postoperative conduction disturbances after repair of...