Abstract 231: The Effect of Dispatcher Call Processing Interval and Ambulance Response Interval for Survival From Cardiac Arrest
Introduction: Out-of hospital cardiac arrest (OHCA) affects millions of people in the world annually but the survival rate is low. Survival from OHCA has been associated with the ambulance response interval, but not demonstrated to be associated with the dispatcher call processing interval. We assessed the hypothesis that the dispatcher call processing interval and the ambulance response interval were related to survival from OHCA.
Aim: To describe the dispatcher call processing interval and the ambulance response interval and their association with 30-day survival from OHCA with ventricular fibrillation (VF) or ventricular tachycardia (VT) as the presenting rhythm. The secondary aim was to investigate the association to the secondary outcome measure 1-day survival.
Methods: This retrospective cohort study included 400 witnessed OHCAs with VF/VT as the presenting rhythm in Sweden between February 2005 and January 2009. The patients were randomized to different types of telephone-instructed cardiopulmonary resuscitation in accordance with the previous study (TANGO) which the current study is based on. Patients that the ambulance personnel did not attempt to resuscitate, children below 8 years of age, and OHCAs caused by trauma, airway obstruction, drowning or intoxication were excluded. Logistic regression models were used to investigate the association between survival and the intervals.
Results: The odds of survival were increased when the dispatcher call processing interval (median = 1 minute) was shortened from ≥ 4 minutes to 2-3 minutes (OR 3.8; CI 1.03-14.3) and 0-1 minutes (OR 1.9; CI 0.5-7.1, after adjusting for differences in baseline characteristics (overall p=0.026). The odds of survival were increased when the ambulance response interval (median = 8 minutes) was shortened from ≥ 11 minutes to 5-10 minutes (OR 2.1; CI 0.94-4.7) and 0-4 minutes (OR 4.5; CI 1.8-11), after adjusting for differences in baseline characteristics (overall p=0.026).
Conclusions: Survival from out-of-hospital VF/VT is increased, not only by shortening the ambulance response interval, but also by shortening the dispatcher call processing interval.
- © 2013 by American Heart Association, Inc.