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Changes in the carbon dioxide expirogram in response to ozone exposure
Adekemi B Taylor1, Genea M Lee, Kavitha Nellore
1Department of Chemical Engineering, The Pennsylvania State University, 132B Fenske Laboratory, University Park, PA 16802, USA.
Toxicology and Applied Pharmacology
|October 26, 2005
Summary
The carbon dioxide expirogram effectively quantifies pulmonary responses to ozone (O3) exposure, complementing spirometry in assessing lung mechanics and gas transport changes. This method reveals significant alterations in anatomical dead space and alveolar parameters following O3 inhalation.
Area of Science:
- Pulmonary physiology
- Environmental health
- Respiratory medicine
Background:
- Ozone (O3) is a significant air pollutant with known respiratory effects.
- Forced expired spirometry is commonly used to assess lung function, but alternative methods may offer complementary insights.
- The carbon dioxide (CO2) expirogram provides detailed information on gas transport within the lungs.
Purpose of the Study:
- To quantify pulmonary responses to ozone (O3) exposure using parameters derived from the carbon dioxide expirogram.
- To compare these expirogram-derived responses with decrements observed in forced expired spirometry.
- To evaluate the utility of the CO2 expirogram in characterizing O3-induced lung function changes.
Main Methods:
- Forty-seven healthy non-smokers exercised for 1 hour while inhaling either filtered room air or room air with 0.252 ppm O3.
- Carbon dioxide expirograms were measured before, and at 10 and 70 minutes after exposure.
- Parameters computed included anatomical dead space (VD), alveolar slope (S), normalized slope (NS), peripheral cross-sectional area (AP), and peripheral volume (VMP).
- Forced expired volume in one second (FEV1) was also measured as a standard spirometry parameter.
Main Results:
- Ozone exposure led to significant changes in all measured CO2 expirogram parameters at both 10 and 70 minutes post-exposure (P < 0.002).
- Significant decrements in forced expired volume in one second (FEV1) were observed at 10 and 70 minutes after O3 exposure.
- No significant changes in expirogram parameters or FEV1 were noted after exposure to filtered room air.
Conclusions:
- The CO2 expirogram is a valuable tool for characterizing the effects of O3 exposure on pulmonary gas transport.
- CO2 expirogram parameters provide complementary information to traditional spirometry in assessing O3-induced lung mechanics.
- This method enhances the understanding of respiratory responses to environmental pollutants like ozone.