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Influence of shock strength and timing on induction of ventricular arrhythmias in dogs.

Publication ,  Journal Article
Shibata, N; Chen, PS; Dixon, EG; Wolf, PD; Danieley, ND; Smith, WM; Ideker, RE
Published in: The American journal of physiology
October 1988

We delivered strong shocks via electrodes on the left ventricular apex and the right atrium in seven dogs during the T wave of atrial pacing while recordings were made from 56 epicardial electrodes. After shocks that induced arrhythmias were given, the earliest activation occurred in the middle of the ventricles for lower-energy shocks and in the base for higher-energy shocks. For shocks late in the vulnerable period, activation was recorded soon after the shock, whereas for shocks early in the vulnerable period activation was not recorded for a mean of 70 ms (+/- 17 ms SD) after the shock. We also gave 1-J shocks during right and left ventricular pacing. For shocks early in the vulnerable period, activation initiating fibrillation arose in a focal pattern from the paced region. For shocks during the midportion of the vulnerable period, fibrillation arose by two leading circle reentrant loops rotating in opposite directions, one on the left and the other on the right ventricle. For shocks at the end of the vulnerable period, the two reentrant loops fused on the side of the heart opposite the pacing site to again form a single focal activation pattern. Thus the initial activation patterns of arrhythmias initiated by shocks, the time from the shock until earliest postshock activation, and the site of earliest postshock activation are strongly influenced by the coupling interval and strength of the shock.

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Published In

The American journal of physiology

DOI

EISSN

2163-5773

ISSN

0002-9513

Publication Date

October 1988

Volume

255

Issue

4 Pt 2

Start / End Page

H891 / H901

Related Subject Headings

  • Ventricular Fibrillation
  • Time Factors
  • Models, Cardiovascular
  • Heart Ventricles
  • Heart Atria
  • Heart
  • Electroshock
  • Electric Countershock
  • Dogs
  • Cardiovascular System & Hematology
 

Citation

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Shibata, N., Chen, P. S., Dixon, E. G., Wolf, P. D., Danieley, N. D., Smith, W. M., & Ideker, R. E. (1988). Influence of shock strength and timing on induction of ventricular arrhythmias in dogs. The American Journal of Physiology, 255(4 Pt 2), H891–H901. https://doi.org/10.1152/ajpheart.1988.255.4.h891
Shibata, N., P. S. Chen, E. G. Dixon, P. D. Wolf, N. D. Danieley, W. M. Smith, and R. E. Ideker. “Influence of shock strength and timing on induction of ventricular arrhythmias in dogs.The American Journal of Physiology 255, no. 4 Pt 2 (October 1988): H891–901. https://doi.org/10.1152/ajpheart.1988.255.4.h891.
Shibata N, Chen PS, Dixon EG, Wolf PD, Danieley ND, Smith WM, et al. Influence of shock strength and timing on induction of ventricular arrhythmias in dogs. The American journal of physiology. 1988 Oct;255(4 Pt 2):H891–901.
Shibata, N., et al. “Influence of shock strength and timing on induction of ventricular arrhythmias in dogs.The American Journal of Physiology, vol. 255, no. 4 Pt 2, Oct. 1988, pp. H891–901. Epmc, doi:10.1152/ajpheart.1988.255.4.h891.
Shibata N, Chen PS, Dixon EG, Wolf PD, Danieley ND, Smith WM, Ideker RE. Influence of shock strength and timing on induction of ventricular arrhythmias in dogs. The American journal of physiology. 1988 Oct;255(4 Pt 2):H891–H901.

Published In

The American journal of physiology

DOI

EISSN

2163-5773

ISSN

0002-9513

Publication Date

October 1988

Volume

255

Issue

4 Pt 2

Start / End Page

H891 / H901

Related Subject Headings

  • Ventricular Fibrillation
  • Time Factors
  • Models, Cardiovascular
  • Heart Ventricles
  • Heart Atria
  • Heart
  • Electroshock
  • Electric Countershock
  • Dogs
  • Cardiovascular System & Hematology