PMID: 9533375Apr 9, 1998Paper

Efficacy of low-energy T wave shocks for induction of ventricular fibrillation in patients with implantable cardioverter defibrillators

Journal of Electrocardiology
A K BhandariG W Sun

Abstract

The efficacy of low-energy T wave shocks for induction of ventricular fibrillation (VF) was evaluated in 33 patients undergoing implantable cardioverter defibrillator (ICD) implantation (33 sessions) or predischarge ICD testing (20 sessions). To induce VF, the ventricle was paced for eight cycles at a 400-ms cycle length (S1-S1), and the T wave was scanned with a monophasic shock (S2) delivered via the defibrillating lead system. Of 294 attempts, the T wave shocks induced VF in 65%, nonsustained ventricular tachycardia in 10%, and less than five ventricular beats in 25%. As compared with the failed T shocks, the mean energy of successful T wave shocks was higher and the S1-S2 coupling interval was shorter. When the S2 timing was examined in relation to the T wave peak, the VF induction efficacy was 37% for shocks delivered more than 70 ms before the T wave peak, 82% for shocks delivered 30-70 ms before the T wave peak, and 50% for shocks delivered less than 30 ms before or just after the T wave peak (P < .001). Thus, in patients undergoing ICD implantation or ICD conversion testing, the use of low-energy T wave shocks is an effective and safe method to provoke VF.

Associated Clinical Trials

Citations

Jun 27, 2007·Clinical Research in Cardiology : Official Journal of the German Cardiac Society·G ChristA Bauer
Sep 10, 2013·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·Jason C RubensteinMichael H Kim
Jul 3, 2009·Journal of Electrocardiology·Katie A DillonThomas E Kaib
Feb 27, 2013·Pacing and Clinical Electrophysiology : PACE·Ana BilanovicJoel Katz
Jul 4, 2015·Pacing and Clinical Electrophysiology : PACE·Hiroyuki ItoMelvin M Scheinman
Jan 15, 2004·Pacing and Clinical Electrophysiology : PACE·Arjun D SharmaZiaozheng Zhang
Feb 24, 2001·Journal of Dairy Science·J L KlotzR N Heitmann
Apr 21, 2011·Circulation. Arrhythmia and Electrophysiology·Samuel F SearsJamie B Conti
Oct 30, 2018·Journal of the American Heart Association·Christopher LiviaChristopher J McLeod

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