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How does experimental pulmonary embolism decrease CO2 elimination?

P H Breen1, B Mazumdar, S C Skinner

  • 1Department of Anesthesiology, University of California, Irvine Medical Center, Orange 92613, USA.

Respiration Physiology
|September 1, 1996
PubMed
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Large pulmonary embolism significantly alters CO2 kinetics, initially decreasing exhaled CO2 volume per breath. This change, driven by increased dead space, is not accurately reflected by end-tidal CO2 measurements.

Area of Science:

  • Physiology
  • Respiratory Medicine
  • Cardiovascular Research

Background:

  • Pulmonary embolism (PE) is a critical condition affecting gas exchange.
  • Understanding the impact of PE on carbon dioxide (CO2) kinetics is vital for patient management.

Purpose of the Study:

  • To investigate the effects of acute, large pulmonary embolism on non-steady state CO2 kinetics.
  • To assess the relationship between CO2 production, dead space, and end-tidal CO2 levels during PE.

Main Methods:

  • Acute occlusion of the right pulmonary artery (RPA) in 5 anesthetized, ventilated dogs.
  • Continuous monitoring of CO2 volume exhaled per breath (VCO2,br), end-tidal PCO2 (PETCO2), PaCO2, PvCO2, and cardiac output.

Main Results:

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  • RPA occlusion immediately reduced VCO2,br by 25% due to increased alveolar dead space (VDalv).
  • VCO2,br recovered to baseline within 70 minutes as CO2 accumulated in tissues and lungs.
  • Persistent decrease in PETCO2 was observed despite VCO2,br recovery, indicating VDalv masked underlying CO2 changes.

Conclusions:

  • Large pulmonary embolism acutely impairs CO2 elimination, primarily by increasing alveolar dead space.
  • End-tidal CO2 is an unreliable indicator of CO2 kinetics during pulmonary embolism, failing to reflect recovery of CO2 elimination or changes in arterial CO2 levels.