Pacing and clinical electrophysiology : PACE
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Pacing Clin Electrophysiol · Oct 2006
The electrophysiological characteristics in patients with ventricular stimulation inducible fast-slow form atrioventricular nodal reentrant tachycardia.
Atrioventricular nodal reentrant tachycardia (AVNRT) can usually be induced by atrial stimulation. However, it seldom may be induced with only ventricular stimulation, especially the fast-slow form of AVNRT. The purpose of this retrospective study was to investigate the specific electrophysiological characteristics in patients with the fast-slow form of AVNRT that could be induced with only ventricular stimulation. ⋯ This study demonstrated that patients with the fast-slow form of AVNRT that could be induced with only ventricular stimulation had a different incidence of the antegrade and retrograde dual AVN physiology and the specific electrophysiological characteristics. The mechanism of the AVNRT stimulated only with ventricular stimulation was supposed to be different in patients with the slow-fast and fast-slow forms of AVNRT.
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Pacing Clin Electrophysiol · Sep 2006
A pilot study examining the performance of polynomial-modeled ventricular shock electrograms for rhythm discrimination in implantable devices.
Inappropriate shocks continue to be a problem for patients with implantable defibrillators (ICD). We evaluated the performance of polynomial-modeled ventricular electrograms (EGM) to discriminate between supraventricular tachycardia (SVT) and ventricular tachycardia (VT). ⋯ Our data demonstrate the feasibility of simple polynomial equations that reproduce the depolarization and repolarization phases of human ventricular shock EGM. The ratio of first-order to zero-order QR coefficient was able to reliably discriminate between SVT and VT while reducing the polynomial model to a first-order system. The results of this pilot trial may serve as the basis for a larger prospective trial implementing a discrimination algorithm for use in low computational power implantable devices.
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Pacing Clin Electrophysiol · Aug 2006
Case ReportsImplant of a biventricular pacemaker in a patient with dextrocardia and persistent left superior vena cava.
Congenital anomalies of the heart can pose challenges to cardiac invasive procedures. Here, we present the case of a 40-year-old man with the combination of dextrocardia, a persistent left superior vena cava, and idiopathic dilated cardiomyopathy. We describe the successful implantation of a biventricular pacemaker-defibrillator under this complex anatomic condition.
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Pacing Clin Electrophysiol · Aug 2006
Controlled Clinical TrialUltrasound-guided venous access for permanent pacemaker leads.
Existing methods of venous access for permanent pacemaker leads have disadvantages. We documented learning times for ultrasound-guided lead implantation and compared them with cephalic venotomy technique. ⋯ Ultrasound-guided venepuncture for placement of permanent pacing leads is quick to learn and achieves faster lead placement times with shorter and more predictable fluoroscopy time when compared with the cephalic venotomy technique.