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Analysis of Prehospital Scene Time and Survival from Out-of-Hospital, Non-Traumatic, Cardiac Arrest

Published online by Cambridge University Press:  28 June 2012

Daniel W. Spaite*
Affiliation:
Arizona Emergency Medicine Research Center, College of Medicine, University of Arizona, Tucson, USA
Elizabeth A. Criss
Affiliation:
Arizona Emergency Medicine Research Center, College of Medicine, University of Arizona, Tucson, USA
Terence D. Valenzuela
Affiliation:
Arizona Emergency Medicine Research Center, College of Medicine, University of Arizona, Tucson, USA Medical Division Tucson Fire Department, Tucson, Arizona, USA
Harvey W. Meislin
Affiliation:
Arizona Emergency Medicine Research Center, College of Medicine, University of Arizona, Tucson, USA
John Ross
Affiliation:
Medical Division Tucson Fire Department, Tucson, Arizona, USA
*
Presented to the 6th Annual Scientific Assembly of the National Association of EMS Physicians, June 14–17, 1990, Houston, Texas, USA

Abstract

The purpose of this study was to determine whether shorter prehospital scene time (ST) is associated with an increased survival rate in non-traumatic, out-of-hospital, cardiac arrest (CA) in a medium-sized, metropolitan EMS system. Information was retrieved for all adult victims (age ≥18 years) of CA treated and transported by a metropolitan fire department over a 16month period (6/87–9/88). Data were retrieved from the fire department's database, hospital records, and death certificates. Statistical analysis of continuous variables was performed using the two-tailed, Student's t-test and non-parametric evaluations were performed by square analysis with p<0.05 considered significant. Two hundred ninety-eight cases were recorded of which 293 patients (98.3%) had documented ST (study group). Seventy-nine patients (27.0%) had ST <12 minutes, while 214 (73.0%) had ST≥12 minutes. Patients with ST <12 minutes were more likely to have return of spontaneous circulation in the field (26.6% vs. 15.9%, p<0.05) and also were more likely to survive than were patients with ST ≥12 minutes (13.9% vs. 6.5%, p<0.05). Mean ST for survivors was significantly less than for non-survivors (12.8 vs. 15.3 min., p<0.05).

We conclude that, in our system, adult victims of CA with ST <12 minutes are more likely to survive than are patients with longer ST. In addition, the mean ST for survivors is shorter than for non-survivors. It remains unclear whether shorter ST actually has an impact on survival or is merely a reflection of a sub-group with rapid resuscitation and consequently a higher likelihood of survival. Future investigations are needed to determine whether shorter ST actually impacts the likelihood of survival from CA.

Type
Original Research
Copyright
Copyright © World Association for Disaster and Emergency Medicine 1991

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