Accuracy of determining cardiac arrest by emergency medical dispatchers.

STUDY OBJECTIVE

To identify and determine the rates of delivery and performance of telephone CPR in noncardiac arrest incidents.

DESIGN

We studied prospectively all out-of-hospital cardiac arrest and potential cardiac arrest incidents from July 1 through October 31, 1992.

SETTING

King County, Washington, excluding the city of Seattle.

PARTICIPANTS

Persons with cardiac arrest or an initial complaint resembling cardiac arrest who received emergency medical services.

INTERVENTIONS

Dispatcher-assisted telephone CPR.

MEASUREMENTS AND MAIN RESULTS

Three hundred fifty-eight incidents of cardiac arrest, respiratory arrest, and potential cardiac arrest were reviewed. Telephone CPR was offered appropriately in 61 of 87 cases (70%) and inappropriately in eight of 154 potential cardiac arrests (5.2%) (95% confidence interval, 1.7%, 8.7%). Ventilation instructions were performed appropriately in 52 of 87 cases (60%) and inappropriately in three of 154 potential cardiac arrests (1.9%) (95% confidence interval, 0%, 4.1%). Chest compressions were performed appropriately in 26 of 68 cardiac arrests (38.2%) and inappropriately in two of 173 potential cardiac arrests (1.2%) (95% confidence interval, 0%, 2.8%).

CONCLUSION

We found a low rate of performance of telephone CPR in King County for incidents resembling cardiac arrest. This finding suggests that the protocols designed for dispatcher-assisted telephone CPR effectively screen out those incidents that may initially resemble cardiac arrest.