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Related Experiment Videos

Hypercarbic acidosis reduces cardiac resuscitability.

I von Planta1, M H Weil, M von Planta

  • 1University of Health Sciences, Chicago Medical School, IL 60064.

Critical Care Medicine
|September 1, 1991
PubMed
Summary

High levels of inspired carbon dioxide (FICO2) significantly impair successful resuscitation from cardiac arrest in rats. Even with adequate oxygenation, a FICO2 of 0.5 prevented resuscitation, highlighting the detrimental effects of hypercarbic acidosis.

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Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Physiology

Background:

  • Cardiac arrest and resuscitation are associated with increased myocardial hypercarbia and acidosis.
  • The independent impact of hypercarbic acidosis on resuscitation outcomes remains unclear.

Purpose of the Study:

  • To determine if hypercarbic acidosis, independent of oxygenation, is detrimental to cardiac resuscitation.
  • To investigate the effects of varying inspired carbon dioxide concentrations on resuscitation success.

Main Methods:

  • Three groups of rats were ventilated with varying inspired carbon dioxide fractions (FICO2: 0.0, 0.3, 0.5) while maintaining constant oxygenation.
  • Ventricular fibrillation was induced, followed by mechanical chest compressions and attempted defibrillation.

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Main Results:

  • Successful resuscitation was achieved in animals ventilated with FICO2 of 0.0 and 0.3.
  • No animals ventilated with FICO2 of 0.5 (aortic pH < 6.67, PCO2 > 200 torr) were resuscitated (p < .001).
  • A control group without cardiac arrest showed no adverse effects from FICO2 of 0.5 ventilation.

Conclusions:

  • Elevated inspired carbon dioxide levels (FICO2 0.5) preclude successful resuscitation in a rodent model of CPR.
  • Hypercarbic acidosis, even with adequate oxygenation, poses a significant barrier to restoring circulation.