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Contribution of out-of-hospital factors to a reduction in cardiac arrest mortality after witnessed ventricular fibrillation or tachycardia.
MedLine Citation:
PMID:  23182844     Owner:  NLM     Status:  Publisher    
BACKGROUND: Mortality rates in Osaka for cardiac arrest after witnessed ventricular tachycardia (VT) or ventricular fibrillation (VF) have decreased dramatically. We sought to estimate the contribution of changes in out-of-hospital care to this decrease. METHODS: We applied a previously validated statistical model, IMPACT, to data obtained from the Utstein Osaka Project, which registers all cardiopulmonary arrests in Osaka. The outcome was death within the first month after the arrest. Sensitivity analysis was conducted by simulating an increase in the use of public access defibrillators (PADs). RESULTS: From 1999 through 2008, age- and sex-adjusted standardized 1-month mortality fell from 88.6% to 57.1%. There were 105 fewer deaths than expected in 2008 (295 deaths). The IMPACT model explained 62.5% of the decrease (67 deaths) in the 1-month mortality. The main contributors to the decrease in mortality were an increase in the use of biphasic waveform defibrillators, and a shortened time to first shock. These were partly offset by an increase in the administration of epinephrine by emergency medical services personnel. According to the simulation, an increase in PAD use from 1.9% to 34.4% would reduce mortality from the observed 55.7% to 50.1%. CONCLUSIONS: Modeling suggests that improvement in out-of-hospital care accounted for approximately 60% of the decline in deaths following witnessed VT or VF arrests in Osaka between 1999 and 2008. Increased usage of PADs could further improve these outcomes.
Fumiaki Nakamura; Yasuaki Hayashino; Tatsuya Nishiuchi; Naoki Kakudate; Misa Takegami; Yosuke Yamamoto; Shin Yamazaki; Shunichi Fukuhara
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-23
Journal Detail:
Title:  Resuscitation     Volume:  -     ISSN:  1873-1570     ISO Abbreviation:  Resuscitation     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0332173     Medline TA:  Resuscitation     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Ireland Ltd.
Department of Epidemiology and Healthcare Research, Kyoto University Graduate School of Medicine and Public Health.
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