title: Dispatcher-assisted cardiopulmonary resuscitation and survival in cardiac arrest.
abstract: BACKGROUND
  Early cardiopulmonary resuscitation (CPR) improves survival in out-of-hospital cardiac arrest, and dispatcher-delivered instruction in CPR can increase the proportion of arrest victims who receive bystander CPR before emergency medical service (EMS) arrival. However, little is known about the survival effectiveness of dispatcher-delivered telephone CPR instruction.
  
  
  RESULTS
  We evaluated a population-based cohort of EMS-attended adult cardiac arrests (n=7265) from 1983 through 2000 in King County, Washington, to assess the association between survival to hospital discharge and 3 distinct CPR groups: no bystander CPR before EMS arrival (no bystander CPR), bystander CPR before EMS arrival requiring dispatcher instruction (dispatcher-assisted bystander CPR), and bystander CPR before EMS arrival not requiring dispatcher instruction (bystander CPR without dispatcher assistance). In this cohort, 44.1% received no bystander CPR before EMS arrival, 25.7% received dispatcher-assisted bystander CPR, and 30.2% received bystander CPR without dispatcher assistance. Overall survival was 15.3%. Using no bystander CPR as the reference group, the multivariate adjusted odds ratio of survival was 1.45 (95% confidence interval [CI], 1.21, 1.73) for dispatcher-assisted bystander CPR and 1.69 (95% CI, 1.42, 2.01) for bystander CPR without dispatcher assistance.
  
  
  CONCLUSIONS
  Dispatcher-assisted bystander CPR seems to increase survival in cardiac arrest.
authors.affiliation: Public Health, Seattle King County, Department of Medicine, University of Washington, Seattle, USA. rea123@u.washington.edu
authors.forename: T D
authors.initials: TD
authors.lastname: Rea
authors.forename: M S
authors.initials: MS
authors.lastname: Eisenberg
authors.forename: L L
authors.initials: LL
authors.lastname: Culley
authors.forename: L
authors.initials: L
authors.lastname: Becker
mesh_terms: D000368:Aged; D016887:Cardiopulmonary Resuscitation / Q000379:methods*; D015331:Cohort Studies; D004632:Emergency Medical Services; D005260:Female; D006323:Heart Arrest / Q000401:mortality* / Q000628:therapy*; D006801:Humans; D008297:Male; D016019:Survival Analysis