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Low level CO2 effects on pulmonary function in humans

J Sexton1, K Mueller, A Elliott

  • 1Case Western Reserve University, Cleveland, OH, USA.

Aviation, Space, and Environmental Medicine
|April 30, 1998
PubMed
Summary
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Low levels of carbon dioxide (CO2) exposure in a chamber did not significantly alter lung function in healthy subjects. However, a reduction in diffusing capacity for carbon monoxide (DLCO) and cardiac output was observed.

Area of Science:

  • Environmental Health
  • Pulmonary Physiology
  • Cardiovascular Physiology

Background:

  • Human exposure to elevated carbon dioxide (CO2) levels can occur in various environments.
  • Understanding the physiological effects of low-level CO2 exposure is crucial for assessing potential health risks.

Purpose of the Study:

  • To investigate the functional alterations in human gas mixing and closing volume due to chamber exposure to low levels of CO2 (0.7% and 1.2%).

Main Methods:

  • Four healthy volunteers underwent controlled chamber exposure to 0.7% and 1.2% CO2 over 23 days.
  • Measurements included spirometry, lung volumes, single breath nitrogen washout, diffusing capacity for carbon monoxide (DLCO), and cardiac output.
  • Data were collected at multiple time points during exposure and analyzed for changes.
Keywords:
NASA Discipline CardiopulmonaryNon-NASA Center

Related Experiment Videos

Main Results:

  • Consistent findings included a reduction in diffusing capacity for carbon monoxide (DLCO) and a fall in cardiac output at both CO2 concentrations.
  • No significant major effects were observed in spirometry, lung volumes, gas mixing, or dead space for the group as a whole.
  • Post-exposure testing showed no adverse health effects associated with the observed physiological changes.

Conclusions:

  • Low-level CO2 exposure may induce subtle changes in distal gas exchanging units, but these are unlikely to cause pathophysiologic changes in lung function or structure.
  • The study suggests a low likelihood of adverse health effects from short-term exposure to 0.7% or 1.2% CO2.