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A stable rhythm of very short cycle length (CL) in the left atrium (LA) can cause fibrillatory conduction, particularly in the right atrium (RA). Fast Fourier transform (FFT) analysis reliably identifies LA to RA conduction path(s) during atrial fibrillation (AF). We tested the hypotheses that FFT analysis of atrial electrograms (AEGs) during AF simulation will reliably identify the critical LA driver...
Background: Protected right atrial activation due to anisotropy and/or anatomic obstacles is critical for the maintenance of typical atrial flutter. Little is known about the existence of protected activation of the left atrium (LA).Methods: We studied 27 patients (pts) with AVRT using a single concealed left lateral accessory pathway (AP). Recordings were obtained from His bundle, right ventricle...
Background: Postoperative junctional ectopic tachycardia (JET) is a known complication after surgery for congenital heart disease. The purpose of this study was to examine the relationship between age at the time of primary tetralogy of Fallot (TOF) repair and the development of postoperative JET.Methods: Hospital records of 56 patients who underwent TOF repair from July 1995 to March 1997 at UCSF...
Background: The utility of transvenous pacing, despite its advantages, has been limited in small subjects, primarily due to relative size of the pacemaker lead and subclavian vein. The purpose of this study was to evaluate the effectiveness of transvenous chronic pacing in a small rabbit model.Methods: Seven rabbits weighing 4.3 to 5.4 kg (mean 4.8 kg) underwent permanent pacemaker system implantation...
Abstract. Electrograms observed prior to successful and unsuccessful ablation trials in 33 patients (362 attempts) with manifest pathways and 18 patients (194 attempts) with concealed pathways were compared to identify the electrogram patterns that are associated with successful radiofrequency ablation of accessory atrioventricular connections in young patients (mean age 12.7 years; range 422 years)...
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