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Critical Care
Published in: Critical Care 3/2011

Open Access 01-06-2011 | Research

Collapse-to-emergency medical service cardiopulmonary resuscitation interval and outcomes of out-of-hospital cardiopulmonary arrest: a nationwide observational study

Authors: Soichi Koike, Toshio Ogawa, Senzan Tanabe, Shinya Matsumoto, Manabu Akahane, Hideo Yasunaga, Hiromasa Horiguchi, Tomoaki Imamura

Published in: Critical Care | Issue 3/2011

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Abstract

Introduction

The relationship between collapse to emergency medical service (EMS) cardiopulmonary resuscitation (CPR) interval and outcome has been well documented. However, most studies have only analyzed cases of cardiac origin and Vf (ventricular fibrillation)/pulseless VT (ventricular tachycardia). We sought to examine all causes of cardiac arrest and analyze the relationship between collapse-to-EMS CPR interval and outcome in a nationwide sample using an out-of-hospital cardiac arrest (OHCA) registry.

Methods

This was a retrospective observational study based on a nationwide OHCA patient registry in Japan between 2005 and 2008 (n = 431,968). We included cases where collapse was witnessed by a bystander and where collapse and intervention time were recorded (n = 109,350). Data were collected based on the Utstein template. One-month survival and neurologically favorable one-month survival were used as outcome measures. Logarithmic regression and logistic regression were used to examine the relation between outcomes and collapse-to-EMS CPR interval.

Results

Among collapse-to-EMS CPR intervals between 3 and 30 minutes, the logarithmic regression equation for the relationship with one-month survival was y = -0.059 ln(x) + 0.21, while that for the relationship with neurologically favorable one-month survival was y = -0.041 ln(x) + 0.13. After adjusting for potential confounders in the logistic regression analysis for all intervals, longer collapse-to-EMS CPR intervals were associated with lower rates of one-month survival (odds ratio (OR) 0.93, 95% confidence interval (CI): 0.93 to 0.93) and neurologically favorable one-month survival (OR 0.89, 95% CI 0.89 to 0.90).

Conclusions

Improving the emergency medical system and CPR in cases of OHCA is important for improving the outcomes of OHCA.
Appendix
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Metadata
Title
Collapse-to-emergency medical service cardiopulmonary resuscitation interval and outcomes of out-of-hospital cardiopulmonary arrest: a nationwide observational study
Authors
Soichi Koike
Toshio Ogawa
Senzan Tanabe
Shinya Matsumoto
Manabu Akahane
Hideo Yasunaga
Hiromasa Horiguchi
Tomoaki Imamura
Publication date
01-06-2011
Publisher
BioMed Central
Published in
Critical Care / Issue 3/2011
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/cc10219

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