Rapidly Switching Multidirectional Defibrillation: Reversal Of Ventricular Fibrillation With Lower Energy Shocks

dc.creatorViana M.A.
dc.creatorBassani R.A.
dc.creatorPetrucci O.
dc.creatorMarques D.A.
dc.creatorBassani J.W.M.
dc.date2014
dc.date2015-06-25T17:55:41Z
dc.date2015-11-26T14:40:36Z
dc.date2015-06-25T17:55:41Z
dc.date2015-11-26T14:40:36Z
dc.date.accessioned2018-03-28T21:46:57Z
dc.date.available2018-03-28T21:46:57Z
dc.identifier
dc.identifierJournal Of Thoracic And Cardiovascular Surgery. Mosby Inc., v. 148, n. 6, p. 3213 - 3218, 2014.
dc.identifier225223
dc.identifier10.1016/j.jtcvs.2014.07.035
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84920036980&partnerID=40&md5=d6a374f4e8f9a5cfe1700121b60e0e9e
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/86885
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/86885
dc.identifier2-s2.0-84920036980
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1250472
dc.descriptionObjectives Cardiac arrest after open surgery has an incidence of approximately 3%, of which more than 50% of the cases are due to ventricular fibrillation. Electrical defibrillation is the most effective therapy for terminating cardiac arrhythmias associated with unstable hemodynamics. The excitation threshold of myocardial microstructures is lower when external electrical fields are applied in the longitudinal direction with respect to the major axis of cells. However, in the heart, cell bundles are disposed in several directions. Improved myocardial excitation and defibrillation have been achieved by applying shocks in multiple directions via intracardiac leads, but the results are controversial when the electrodes are not located within the cardiac chambers. This study was designed to test whether rapidly switching shock delivery in 3 directions could increase the efficiency of direct defibrillation.© 2014 The American Association for Thoracic Surgery Methods A multidirectional defibrillator and paddles bearing 3 electrodes each were developed and used in vivo for the reversal of electrically induced ventricular fibrillation in an anesthetized open-chest swine model. Direct defibrillation was performed by unidirectional and multidirectional shocks applied in an alternating fashion. Survival analysis was used to estimate the relationship between the probability of defibrillation and the shock energy.Results Compared with shock delivery in a single direction in the same animal population, the shock energy required for multidirectional defibrillation was 20% to 30% lower (P <.05) within a wide range of success probabilities.Conclusions Rapidly switching multidirectional shock delivery required lower shock energy for ventricular fibrillation termination and may be a safer alternative for restoring cardiac sinus rhythm.
dc.description148
dc.description6
dc.description3213
dc.description3218
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dc.languageen
dc.publisherMosby Inc.
dc.relationJournal of Thoracic and Cardiovascular Surgery
dc.rightsfechado
dc.sourceScopus
dc.titleRapidly Switching Multidirectional Defibrillation: Reversal Of Ventricular Fibrillation With Lower Energy Shocks
dc.typeArtículos de revistas


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