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  • Open Access

Time factors rather than type and/or nature of CPR modify the prognosis of out-of-hospital cardiac arrests witnessed by bystanders

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Critical Care201014 (Suppl 1) :P309

  • Published:


  • Public Health
  • Regression Analysis
  • Survival Rate
  • Logistic Regression
  • Logistic Regression Analysis


The purpose of the study was to analyze the effects of the type and nature of CPR on the prognosis of out-of-hospital cardiac arrests (OHCAs).


We analyzed 1,612 OHCAs, witnessed by citizens and handled by the dispatch system in Ishikawa, Japan, from 1 April 2003 to 31 March 2008. Bystander CPR was classified into four groups according to type (CC only or CC + MMV) and nature (under one's own initiative or telephone-assisted instruction).


The presence of bystander CPR significantly augmented the 1-month survival rate. However, there were no significant differences among the four groups of CPR. The multivariate logistic regression analysis identified three time factors including intervals of collapse-to-call, call-to-first CPR, call-to-arrival to patients as independent factors associated with 1-month survival. See Figures 1 and 2.
Figure 1
Figure 1

Effect of bystander CPR on the 1-month survival rate.

Figure 2
Figure 2

Factors associated with 1-month survival


Significance of correctable time factors rather than type of CPR should be considered in the future guideline revision.

Authors’ Affiliations

Kanazawa University Graduate School of Medicine, Kanazawa, Japan


© BioMed Central Ltd. 2010