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Related Experiment Videos

Permissive hypercapnia in acute respiratory failure

A Bidani1, A E Tzouanakis, V J Cardenas

  • 1Department of Internal Medicine, University of Texas Medical Branch, Galveston 77555-0561.

JAMA
|September 28, 1994
PubMed
Summary

Permissive hypercapnia, a lung-protective ventilation strategy, minimizes lung injury by limiting pressure or volume. Preliminary human trials suggest improved survival in acute respiratory distress syndrome, but controlled studies are needed.

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Ventilator-induced lung injury (VILI) is a significant concern in acute respiratory distress syndrome (ARDS).
  • Alveolar overdistention, a primary mechanism of VILI, can be exacerbated by conventional mechanical ventilation settings.
  • Permissive hypercapnia is a strategy to mitigate VILI by allowing higher carbon dioxide levels.

Purpose of the Study:

  • To evaluate the efficacy of pressure limitation with permissive hypercapnia in treating ARDS.
  • To assess potential complications of systemic hypercarbia.
  • To review available human outcome studies on this ventilation strategy.

Main Methods:

  • Literature search of MEDLINE, reference citations, and expert consultations.

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  • Selection of animal models and human clinical trials addressing pressure/volume limitation and hypercapnia.
  • Analysis of clinical data including pressures, volumes, ventilation, and PCO2; quantitative physiological analysis.

    • Main Results:

    • Animal data strongly support that alveolar overdistention causes lung injury.
    • ARDS lungs are susceptible to injury from conventional tidal volumes.
    • Uncontrolled human trials of permissive hypercapnia show improved survival compared to predicted mortality.

    Conclusions:

    • Limiting alveolar overdistention via pressure/volume control is supported by animal and simulation data.
    • Hypercarbia's negative effects appear manageable in ARDS patients in preliminary trials.
    • Controlled trials are essential to confirm the benefits of permissive hypercapnia before widespread adoption.