Ventricular fibrillation during no-flow global ischemia in isolated rabbit hearts

Tsu Juey Wu*, Shien-Fong Lin, Yu Cheng Hsieh, Chih Tai Ting, Peng Sheng Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Introduction: The dominant frequency (DF) during ventricular fibrillation (VF) in Langendorff-perfused guinea pig hearts is higher in left ventricle (LV) than in right ventricle (RV). However, the onset of VF invariably leads to global ischemia. Whether or not a high DF source exists in LV during global ischemia is unknown. Methods and Results: By using a two-camera optical mapping system, epicardial activation patterns of VF were studied in 12 isolated rabbit hearts during baseline, no-flow global ischemia, and reperfusion. Simultaneous endocardial electrode recording was performed in 4 of the 12 hearts. Optical mapping showed type 1 VF at baseline, with multiple wandering and short-lived wavelets. After the onset of global ischemia, VF showed progressively increased spatiotemporal periodicity. The majority (65%) of VF recorded after 7 minutes of global ischemia showed type 2 VF, containing a single epicardial site with stable (≥3.85 seconds in duration) repetitive activities. Among the 33 sites with these activities, 24 were located near the interventricular septum, and 27 showed an epicardial breakthrough pattern with centrifugal propagation and wavebreaks distant from the focal site. After 10 minutes of global ischemia, the DF was lower on LV epicardium (5.0 ± 1.4 Hz) than on RV epicardium (8.6 ± 2.5 Hz, P < 0.001). However, there was no DF gradient between RV and LV endocardium (9.7 ± 1.0 vs 9.6 ± 0.9 Hz). Conclusions: VF during prolonged global ischemia is consistent with type 2 VF with a single subepicardial source of rapid activation, mostly near the interventricular septum. The DF in LV is not higher than in RV.

Original languageEnglish
Pages (from-to)1112-1120
Number of pages9
JournalJournal of Cardiovascular Electrophysiology
Volume17
Issue number10
DOIs
StatePublished - 1 Oct 2006

Keywords

  • Arrhythmia
  • Fibrillation
  • Ischemia
  • Mapping
  • Ventricle

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