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Related Experiment Videos

Quality of CPR with three different ventilation:compression ratios.

E Dorph1, L Wik, T A Strømme

  • 1Norwegian Air Ambulance, N-1441 Drøbak, Norway. elizabeth@nakos.org

Resuscitation
|August 12, 2003
PubMed
Summary

The 2:15 ventilation:compression ratio in cardiopulmonary resuscitation (CPR) demonstrated superior pulmonary gas exchange and oxygen delivery compared to 2:50 and 5:50 ratios in a pig model. This suggests maintaining the current 2:15 ratio for professional basic CPR.

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Area of Science:

  • Emergency Medicine
  • Physiology
  • Cardiovascular Research

Background:

  • Current adult basic cardiopulmonary resuscitation (CPR) guidelines recommend a 2:15 ventilation:compression ratio.
  • The optimal ratio for CPR remains unknown, necessitating further investigation into its effects on physiological parameters.

Purpose of the Study:

  • To compare arterial and mixed venous blood gas changes, cerebral circulation, and oxygen delivery using ventilation:compression ratios of 2:15, 2:50, and 5:50 during basic CPR.
  • To evaluate the efficacy of different CPR ratios in a controlled animal model.

Main Methods:

  • Ventricular fibrillation was induced in 12 anesthetized pigs, with data from 9 utilized.
  • A randomized, cross-over design was employed, with each CPR method (2:15, 2:50, 5:50) applied for 5 minutes after a 3-minute non-intervention interval.

Related Experiment Videos

  • Ventilations used 17% oxygen and 4% carbon dioxide, with mechanical compressions and brief pauses for ventilation.

    • Main Results:

    • Pulmonary gas exchange was superior with the 2:15 ratio, maintaining arterial oxygen saturation above 80%.
    • The 2:15 ratio provided higher oxygen delivery to the brain and improved central venous oxygenation compared to the other ratios.
    • While the 2:50 ratio yielded more compressions per minute and higher carotid flow, cerebrocortical microcirculation showed no significant differences between methods.

    Conclusions:

    • The 2:15 ventilation:compression ratio appears most effective for pulmonary gas exchange and oxygen delivery during basic CPR in this model.
    • Current guidelines recommending the 2:15 ratio for professional basic CPR should likely be maintained, provided brief ventilation pauses are achievable.
    • Findings from this mechanical CPR model in pigs may not be directly generalizable to layperson CPR due to variations in technique and pauses.