| Transthoracic impedance used to evaluate performance of cardiopulmonary resuscitation during out of hospital cardiac arrest. | |
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MedLine Citation:
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PMID: 19061785 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: There is a need to measure cardiopulmonary resuscitation (CPR) in order to document whether ambulance personnel follow CPR guidelines. Our goal was to do this using defibrillator technology based on changes in transthoracic impedance (TTI) produced by chest compressions and ventilations. METHODS: 122 incidents of out-of-hospital cardiac arrest between May 2003 and February 2004 were analysed based on data recorded from defibrillators in Oslo EMS. New software was used to analyze chest compressions and ventilations based on changes in thoracic impedance between the defibrillator pads, as well as ECG and other event data. RESULTS: In total, 25+/-14% (varying from 76% to 3%) of the time chest compressions were not performed on patients without spontaneous circulation (NFR=No Flow Ratio). When adjusting for time spent on analysis of ECG, pulse check and defibrillation, NFR was 20+/-13% (varying from 70% to 3%). Mean compressions delivered per minute was 87+/-16 and the compression rate during active compressions was 117+/-9min(-1). Individual variation was 31-117min(-1) (mean) and 95-144min(-1) (active periods). A mean of 14+/-3ventilations/min was recorded, varying from 8 to 26min(-1). Compared with the rest of the episode, the first 5min had a significantly higher proportion of time without chest compressions; 30+/-17% (p<0.001) and significantly lower mean compression and ventilation rates; 80+/-19min(-1) and 12+/-4min(-1), respectively (p<0.001 in both cases). CONCLUSIONS: Core CPR values can be measured from TTI signals by using a standard defibrillator and new software. NFR was 25% (20% adjusted) with great rescuer variability. |
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Authors:
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Frederik S Stecher; Jan-Aage Olsen; Ronald E Stickney; Lars Wik |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Resuscitation Volume: 79 ISSN: 0300-9572 ISO Abbreviation: Resuscitation Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-12-08 Completed Date: 2009-03-10 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: 432-7 Citation Subset: IM |
Affiliation:
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National Competence Centre of Emergency Medicine, Institute for Experimental Medical Research, Ulleval University Hospital, 0027 Oslo, Norway. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cardiography, Impedance* Cardiopulmonary Resuscitation / methods* Electric Countershock Electrocardiography Emergency Medical Services / methods* Heart Arrest / therapy* Humans Software |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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