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Related Experiment Videos

EMT-defibrillation: the Wisconsin experience.

D W Olson1, J LaRochelle, D Fark

  • 1Department of Surgery, Medical College of Wisconsin, Milwaukee.

Annals of Emergency Medicine
|August 1, 1989
PubMed
Summary

Early defibrillation by emergency medical technician-defibrillators (EMT-Ds) significantly improved survival rates for prehospital cardiac arrest patients, especially when response times were under eight minutes.

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Area of Science:

  • Emergency Medicine
  • Cardiology
  • Public Health

Background:

  • Prehospital cardiac arrest survival rates have historically been low, particularly in rural settings.
  • Early defibrillation by emergency medical services personnel shows promise for improving outcomes.

Purpose of the Study:

  • To evaluate the effectiveness of emergency medical technician-defibrillators (EMT-Ds) in improving survival rates for prehospital cardiac arrest across diverse communities.
  • To compare survival rates before and after EMT-D implementation.

Main Methods:

  • Prospective study involving 64 ambulance services in varied community settings (rural to suburban).
  • EMTs received standardized training in rhythm recognition and manual defibrillator use.
  • Data collected over 18 months on 566 patients with primary cardiac arrest.

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Main Results:

  • Overall survival rate was 6.4% (36/566), a significant increase from the pre-EMT-D rate of 3.6%.
  • For ventricular fibrillation, survival was 11% overall and 42% for EMT-D-witnessed arrests.
  • Shorter response times (average 3.7 minutes for survivors) were strongly associated with survival; no survivors had response times >8 minutes.

Conclusions:

  • EMT-D programs can significantly improve survival from prehospital cardiac arrest in various settings.
  • Rapid response times are critical for successful defibrillation and patient survival.
  • Further research may optimize EMT-D protocols for different patient populations and arrest rhythms.