Nicotine increases spatiotemporal complexity of ventricular fibrillation wavefront on the epicardial border zone of healed canine infarcts

T. Ohara, M. Yashima, A. Hamzei, M. Favelyukis, A. Park, Young Hoon Kim, W. J. Mandel, P. S. Chen, H. S. Karagueuzian

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background: The influence of a pharmacologic agent on wavefront dynamics during ventricular fibrillation (VF) in a setting of remodeled and healed myocardial infarction (MI) remains poorly explored. We hypothesized that nicotine, by virtue of its complex direct and indirect cardiovascular effects, increases wavefront complexity during VF. Specifically, we sought to determine whether nicotine increases the number and complexity (approximate entropy) of wavelets during stage II VF in hearts with healed MI. Methods and Results: The left anterior descending coronary artery was permanently occluded in five mongrel dogs and wavefront dynamics during VF studied 5 to 6 weeks after occlusion in the open-chest anesthetized state. VF was induced by rapid pacing and the activation pattern mapped on the surviving epicardial border zone (EBZ) of the left ventricle with a plaque (3.2 x 3.8 cm) having 477 bipolar electrodes 1.6 mm apart. VF was mapped before and 20 minutes after 5 μg/kg/min nicotine infusion. Nicotine with a mean arterial plasma concentration of 127 ± 76 ng/mL (range 57 to 240 ng/mL) significantly (P < .01) increased the number of wavelets from 3.8 ± 0.4 to 5 ± 0.41. The increased number of wavelets was caused by an increase (P < .01) in the spontaneous breakup of wavefronts from 4.1 ± 0.9 times/s to 6.9 ± 1.1 times/s. Wavebreak over the EBZ was functional in nature as no breakup occurred during normal sinus rhythm. Approximate entropy, a measure of complexity, significantly (P < .01) increased after nicotine administration from 0.23 ± 0.02 to 0.28 ± 0.01. Conclusions: Nicotine increases the number of wavelets and their complexity during VF by promoting spontaneous wavebreak over the EBZ of healed MI.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Cardiovascular Pharmacology and Therapeutics
Volume4
Issue number2
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Fingerprint

Ventricular Fibrillation
Nicotine
Canidae
Myocardial Infarction
Entropy
Heart Ventricles
Coronary Vessels
Electrodes
Thorax
Dogs

Keywords

  • Approximate entropy
  • Healed myocardial infarction
  • Nicotine
  • Ventricular fibrillation
  • Wavefronts

ASJC Scopus subject areas

  • Pharmacology
  • Cardiology and Cardiovascular Medicine
  • Pharmacology (medical)

Cite this

Nicotine increases spatiotemporal complexity of ventricular fibrillation wavefront on the epicardial border zone of healed canine infarcts. / Ohara, T.; Yashima, M.; Hamzei, A.; Favelyukis, M.; Park, A.; Kim, Young Hoon; Mandel, W. J.; Chen, P. S.; Karagueuzian, H. S.

In: Journal of Cardiovascular Pharmacology and Therapeutics, Vol. 4, No. 2, 01.01.1999, p. 121-127.

Research output: Contribution to journalArticle

Ohara, T. ; Yashima, M. ; Hamzei, A. ; Favelyukis, M. ; Park, A. ; Kim, Young Hoon ; Mandel, W. J. ; Chen, P. S. ; Karagueuzian, H. S. / Nicotine increases spatiotemporal complexity of ventricular fibrillation wavefront on the epicardial border zone of healed canine infarcts. In: Journal of Cardiovascular Pharmacology and Therapeutics. 1999 ; Vol. 4, No. 2. pp. 121-127.
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AU - Ohara, T.

AU - Yashima, M.

AU - Hamzei, A.

AU - Favelyukis, M.

AU - Park, A.

AU - Kim, Young Hoon

AU - Mandel, W. J.

AU - Chen, P. S.

AU - Karagueuzian, H. S.

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KW - Approximate entropy

KW - Healed myocardial infarction

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KW - Wavefronts

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