| Biphasic and monophasic shocks for transthoracic defibrillation: a meta analysis of randomised controlled trials. | |
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MedLine Citation:
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PMID: 12867304 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Biphasic waveforms are routinely used for implantable defibrillators. These waveforms have been less readily adopted for external defibrillation. This study was performed in order to evaluate the efficacy and harms of biphasic waveforms over monophasic waveforms for the transthoracic defibrillation of patients in ventricular fibrillation (VF) or haemodynamically unstable ventricular tachycardia. METHODS: Studies included randomised controlled trials comparing monophasic and biphasic external defibrillation for participants with VF or hemodynamically unstable ventricular tachycardia. Seven trials (1129 patients) were included in the analysis. All trials were conducted during electrophysiology procedures or implantable cardioverter/defibrillator testing. RESULTS: Compared with 200 J monophasic shocks, 200 J biphasic shocks reduced the risk of post-first shock asystole or persistent VF by 81% (relative risk (RR) 0.19; 95% confidence intervals (CI) 0.06-0.60) for the first shock. Reducing the energy of the biphasic waveform to 115-130 J resulted in similar effectiveness compared with the monophasic waveform at 200 J (RR 1.07, CI 0.66-1.74). Low energy biphasic shocks produce less myocardial injury than higher energy monophasic shocks as determined by ST segment deflection after shock. CONCLUSIONS: Biphasic waveforms defibrillate with similar efficacy at lower energies than standard 200 J monophasic waveforms, and greater efficacy than monophasic shocks of the same energy. Available data suggests that lower delivered energy and voltage result in less post-shock myocardial injury. |
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Authors:
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Steven C Faddy; Jane Powell; Jonathan C Craig |
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Publication Detail:
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Type: Journal Article; Meta-Analysis |
Journal Detail:
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Title: Resuscitation Volume: 58 ISSN: 0300-9572 ISO Abbreviation: Resuscitation Publication Date: 2003 Jul |
Date Detail:
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Created Date: 2003-07-17 Completed Date: 2003-12-11 Revised Date: 2009-08-25 |
Medline Journal Info:
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Nlm Unique ID: 0332173 Medline TA: Resuscitation Country: Ireland |
Other Details:
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Languages: eng Pagination: 9-16 Citation Subset: IM |
Affiliation:
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Cardiology Department, St Vincent's Hospital Sydney, Victoria St, Darlinghurst, NSW 2010, Australia. sfaddy@health.usyd.edu.au |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Defibrillators, Implantable Electric Countershock / methods* Humans Randomized Controlled Trials as Topic Tachycardia, Ventricular / therapy |
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