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Acute pulmonary toxicity of a commercial fluorocarbon--lipid aerosol
Abstract:
The death of an adolescent after deliberate inhalation of the domestic fluorocarbon--lipid spray, PAM, triggered an investigation of the effects of this product on mammalian lung. Some of its constituents are known to destroy the lung-surfactant system, but death from its inhalation by earlier victims was usually attributed to the fluorocarbon's cardiac arrhythmogenic properties. In the present study, we applied methods and experimental models not previously used to study the effects of this aerosol material on the lung surfactant. We found morphological and functional acute disintegration of normal alveolar surfactant, leading to extensive alveolar collapse, with sustained and elevated surface tensions in vitro. This could result in fatal hypoxaemia at inspired concentrations of fluorocarbons insufficient to cause cardiac arrhythmias, and may explain at least partly the large number of deaths associated with inhalation of such product.
Insights
Deliberate inhalation of PAM aerosol causes acute lung surfactant disintegration and alveolar collapse. This lung injury can lead to fatal hypoxemia, explaining deaths not attributed to cardiac issues.
Area of Science:
- Toxicology
- Pulmonary Medicine
- Biochemistry
Background:
- Deliberate inhalation of aerosolized products like PAM (a domestic fluorocarbon-lipid spray) has been linked to fatalities.
- Previous deaths were often attributed to the cardiac arrhythmogenic effects of fluorocarbons.
- The impact of such aerosols on the lung surfactant system remained under-investigated.
Purpose of the Study:
- To investigate the effects of PAM aerosol constituents on the mammalian lung surfactant system.
- To determine if lung surfactant damage could explain fatalities not linked to cardiac arrhythmias.
Main Methods:
- Utilized novel experimental models and methods to assess aerosol effects on lung surfactant.
- Examined morphological and functional changes in alveolar surfactant post-exposure.
- Measured surface tension in vitro to evaluate surfactant function.
Main Results:
- Observed acute morphological and functional disintegration of alveolar surfactant.
- Documented extensive alveolar collapse due to surfactant dysfunction.
- Found sustained and elevated surface tensions in vitro, indicating impaired surfactant activity.
Conclusions:
- PAM aerosol inhalation causes severe acute lung surfactant damage and alveolar collapse.
- This lung injury can lead to fatal hypoxemia, even at concentrations below those causing cardiac arrhythmias.
- Surfactant system damage is a significant, potentially primary, mechanism for deaths associated with PAM inhalation.