The effect of induction method on defibrillation threshold and ventricular fibrillation cycle length

Journal of Cardiovascular Electrophysiology
Endre ZimaBéla Merkely

Abstract

Since no clinical data are available on the comparison of the "shock on T-wave" and "high frequency burst" ventricular fibrillation (VF) induction modes during defibrillation threshold (DFT) testing, we aimed to compare these two methods during implantable cardioverter defibrillator implantation. The DFT was determined with a step-down protocol using biphasic, anodal polarity (100%, 40%, 20% voltage control) shocks. Patients were randomized: VF was induced by 50 Hz burst in group B (n = 45) and T-wave shock in group T (n = 41). The DFT was defined as the lowest energy level that terminated VF; confirmed DFT (DFTc) was defined as the minimal energy level that consecutively terminated VF twice. Success rate of DFTc was calculated during an intraindividual test for the alternate induction method. A total of 546 episodes of VF were induced: n = 278 (B) vs n = 268 (T). Incidence of VT during inductions was 9.9% (B) vs 2.7% (T), P < 0.05. Neither the DFT, 8.8 +/- 4.0 J (B) vs 9.7 +/- 4.2 J (T), nor the DFTc, 10.6 +/- 5.1 J (B) vs 10.8 +/- 4.2 J (T), proved to be significantly different. A significant correlation was found between VF cycle length (CL) and the concomitant DFT (r = 0.298, P < 0.05) in group T only. Subgroup analysis of ...Continue Reading

References

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Citations

May 13, 2010·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·Hoong Sern LimHoward Marshall
Mar 7, 2012·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·Zhongwei ChengPaul J Wang
Jun 3, 2008·Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology·Bernd LemkeUNKNOWN Threshold test using Upper Limit during ImPlantation Study Group
Dec 12, 2012·Interactive Cardiovascular and Thoracic Surgery·Andreas KeyserClaudius Diez
Jul 24, 2012·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·Romain PariautCaryn A Reynolds
Jul 17, 2015·Journal of Cardiovascular Electrophysiology·David E KrummenSanjiv M Narayan
Jul 31, 2013·Journal of Cardiovascular Electrophysiology·Valentina KutyifaPoul Erik Bloch Thomsen
Jul 4, 2015·Pacing and Clinical Electrophysiology : PACE·Hiroyuki ItoMelvin M Scheinman
Jan 8, 2014·Circulation·Mark W KrollRichard M Luceri
Sep 7, 2021·The American Journal of Forensic Medicine and Pathology·Mark W KrollDorin Panescu

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