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- W2034399202 abstract "Near-Lifetime Exposure of the Rat to a Simulated Urban Profile of Nitrogen Dioxide: Pulmonary Function Evaluation. Tepper, J. S., Costa, D. L., Winsett, D. W., Stevens, M. A., Doerfler, D. L., and Watkinson, W. P. (1993). Fundam. Appl. Toxicol. 20, 88-96. To investigate the potential for up to a near lifetime exposure to high-ambient levels of nitrogen dioxide (NO2) to induce functional lung damage group of rats were exposed to air or a simulated urban profile of NO2 (0.5 ppm background, 1.5 ppm peak) for 1, 3, 13, 52, or 78 weeks. The dynamic, static, and diffusional characteristics of the lung were evaluated postexposure in anesthetized rats. Furthermore, for the 13-, 52-, and 78-week groups, additional animals were tested after a 6-, 26-, or 17-week period in filtered air, respectively. No significant NO2 differences between exposed and control animals were found for the nitrogen washout, compliance, lung volume, or diffusion capacity of carbon monoxide measurements At 78 weeks, how ever, a reduction in ΔFEF25% an estimate of convexity in the later portion of the forced expiratory flow volume curve, was observed. Breathing patterns and mechanics were also assessed postexposure in a parallel group of similarly exposed unanesthetized rats. These rats were examined during a filtered air, 4 and 8%, carbon dioxide (CO2) challenge. In the unanesthetized rat, frequency of breathing was significantly decreased and tidal volume, expiratory resistance, and inspiratory and expiratory times tended to increase. For several of these variables, the largest response also occurred at 78 weeks and seemed to be exacerbated by CO2 challenge. For both unnesthetized and anesthetized test groups, the magnitude of the changes in pulmonary function were small and their significance was borderline, thus indicating that near-lifetime exposure to the rat of a high ambient urban profile of NO2 does not lead to dysfunction suggestive of degenerative lung disease." @default.
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- W2034399202 title "Near-Lifetime Exposure of the Rat to a Simulated Urban Profile of Nitrogen Dioxide: Pulmonary Function Evaluation" @default.
- W2034399202 doi "https://doi.org/10.1006/faat.1993.1011" @default.
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