Journal Article

16. ICD: Defibrillation Threshold Testing & Other Issues

M. Igarashi, N. Fujino, H. Sato, R. Nakanishi, K. Sasao, T. Ohtsuka, K. Takamura, K. Kobayashi, Y. Okano, S. Sasamoto, M. Honda and K. Yosihara

in EP Europace

Published on behalf of European Heart Rhythm Association of the European Society of Cardiology (ESC)

Volume 7, issue s3, pages S25-S25
Published in print October 2005 | ISSN: 1099-5129
Published online October 2005 | e-ISSN: 1532-2092 | DOI:
16. ICD: Defibrillation Threshold Testing & Other Issues

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Electrical cardioversion for ventricular arrhythmias (VAs) contained of ventricular tachycardia (VT), ventricular fibrillation (VF) and torsades de pointes (TdP), was established to be effective for VAs. Little is known about which case should have an effect on chest thump version (TV) in patients with VAs.


Subjects were 18 patients (Male: Female = 9:9, mean age 61±20 years old). TV was done for 28 episodes in VT, 8 episodes in VF, and 5 episodes in TdP. TV was performed after onset of symptoms within one minutes, and electrocardiogram (ECG) monitor was analyzed. Heart beats were averaged with 10 beats of VF and TdP. The time from Q wave to TV was measured from ECG monitoring in VT patients.


TV successfully terminated VT in 12 of 28 episodes, VF in 1 of 8 episodes, and 1 of 5 episodes. TV terminated VT in the range between -20ms and +60ms. The mean cycle length of VT was 284±30ms, VF was 238±21ms, and TdP was 270±25ms, respectively. The mean cycle length of successful TV was significantly longer than that of failed TV in VT (358±57ms vs 289±59ms, p<0.01). There was no acceleration of VT in this study.


TV was available for slower VT at the timing in the range between -20ms and +60ms, and not for TdP and VF.

Journal Article.  0 words. 

Subjects: Cardiovascular Medicine

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