Chlorine Gas Exposure and Acute Lung Injury Dynamics

Chlorine gas is a potent respiratory irritant that reacts with water in the airways to form hydrochloric and hypochlorous acids, triggering a cascade of oxidative injury. Initial contact at the upper airway epithelium causes epithelial cell apoptosis, sloughing and loss of mucociliary function. As the insult extends into distal airways and alveoli, disruption of the alveolar–capillary barrier leads to protein-rich oedema, inflammatory cell influx and impaired gas exchange. The resulting acute respiratory distress syndrome (ARDS) may develop within hours to days, characterised by reduced lung compliance, severe hypoxaemia and progressive fibrotic remodelling. Recovery depends on efficient epithelial repair, clearance of oedema fluid and resolution of inflammation, but incomplete repair pathways can lead to long-term airway hyperreactivity and fibrosis. Understanding the temporal dynamics of injury, repair and remodelling is essential for development of targeted therapeutics and clinical management strategies.

Research from Nature Portfolio

Recent studies have employed a clinically relevant large-animal model to define dose- and gender-dependent progression of ARDS following chlorine inhalation. Conscious sheep exposed to graded chlorine concentrations exhibited a rapid onset of mild to severe ARDS within hours, with higher concentrations driving more pronounced extravascular lung water accumulation and impaired oxygenation. Although overall responses were broadly similar between male and female animals, subtle differences in pulmonary arterial pressure and oxygenation hinted at sex-specific physiological variations. These findings have refined the temporal framework for ARDS development and provide a robust platform for testing novel interventions under conditions that closely mimic human exposure.

Chlorine Gas Exposure and Acute Lung Injury Dynamics publication trend

The graph below shows the total number of articles in chlorine gas exposure and acute lung injury dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Alveolar–capillary barrier: The thin interface between alveolar air spaces and pulmonary capillaries where gas exchange occurs.

Epithelial sloughing: Detachment of airway epithelial cells from the basement membrane following injury.

Bronchoalveolar lavage fluid (BALF): Fluid collected from the lower respiratory tract used to assess protein levels and inflammatory cells.

Acute respiratory distress syndrome (ARDS): A severe form of respiratory failure characterised by widespread alveolar damage, hypoxaemia and non-cardiogenic pulmonary oedema.

Plasmalogens: A class of phospholipids abundant in lung tissue that react with chlorine to form chlorinated lipid adducts.

References

1. Quantitative assessment of chlorine gas inhalation injury based on endoscopic OCT and spectral encoded interferometric microscope imaging with deep learning. APL Photonics (2024).
2. Dose and gender dependence of chlorine inhalation in a conscious ovine model. Scientific Reports (2023).
3. Formation of chlorinated lipids post-chlorine gas exposure. Journal of Lipid Research (2016).