METHODS AND RESULTS: We carried out a prospective, population-based, observational study involving consecutive patients with emergency responder
resuscitation attempts from May 1, 1998, through April 30, 2003. The primary outcome measure was 1-year survival with favorable neurological outcome. Multivariable logistic regression analysis was performed to evaluate the relationship between type of
CPR and outcomes. Among the 4902 witnessed cardiac arrests, 783 received conventional
CPR, and 544 received cardiac-only
resuscitation. Excluding very-long-duration cardiac arrests (> 15 minutes), the cardiac-only
resuscitation yielded a higher rate of 1-year survival with favorable neurological outcome than no bystander
CPR (4.3% versus 2.5%; odds ratio, 1.72; 95% CI, 1.01 to 2.95), and conventional
CPR showed similar effectiveness (4.1%; odds ratio, 1.57; 95% CI, 0.95 to 2.60). For the very-long-duration arrests, neurologically favorable 1-year survival was greater in the conventional
CPR group, but there were few survivors regardless of the type of bystander
CPR (0.3% [2 of 624], 0% [0 of 92], and 2.2% [3 of 139] in the no bystander
CPR, cardiac-only
CPR, and conventional
CPR groups, respectively; P<0.05).
CONCLUSIONS: