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Temporal changes in respiratory dynamics in mice exposed to phosgene
Alfred M Sciuto1, Robyn B Lee, Jeffry S Forster
1Pharmacology Division, Neurotoxicology Branch, U.S. Army Medical Research Institute of Chemical Defense, 3100 Ricketts Point Road, Aberdeen Proving Ground, MD 21010-5400, USA. Alfred.Sciuto@apg.amedd.army.mil
Inhalation Toxicology
|May 25, 2002
Summary
Phosgene inhalation causes early bronchoconstriction and lung injury, leading to pulmonary edema and altered respiratory dynamics. This study monitored these effects over 12 hours in mice, revealing significant changes in breathing patterns and lung fluid accumulation.
Area of Science:
- Toxicology
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Phosgene inhalation is known to cause delayed pulmonary edema, a critical factor in its toxicity.
- Understanding the temporal progression of respiratory effects is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the impact of phosgene inhalation on respiratory dynamics over a 12-hour period.
- To characterize the development of airway obstruction and pulmonary edema following phosgene exposure.
Main Methods:
- Mice were exposed to phosgene (32 mg/m(3) for 20 min) or room air.
- Respiratory parameters (frequency, tidal volume, airflow, etc.) were measured using whole-body plethysmography for 12 hours.
- Bronchoalveolar lavage fluid protein and lung wet/dry weight ratios were assessed at multiple time points.
Main Results:
- Phosgene exposure significantly altered respiratory parameters including tidal volume and minute ventilation.
- A marked increase in Penh, indicating bronchoconstriction, was observed starting at 5 hours post-exposure.
- Significant increases in bronchoalveolar lavage fluid protein and lung wet/dry weight ratios confirmed pulmonary edema development.
Conclusions:
- Phosgene inhalation induces early bronchoconstriction and an obstructive-like injury pattern.
- Progressive pulmonary edema disrupts respiratory mechanics, highlighting the need for bronchodilation and ventilatory support therapies.