[Acute toxic pneumopathies].

The nature and extent of the acute injury due to toxic inhalants depend on the inhalant's solubility in water pH and chemical reactivity, on the aerodynamic diameter of particles (when the inhalant is an aerosol), and on the degree of exposure. Initial signs and symptoms indicate upper airways and bronchial irritation. Laryngeal oedema and (or) severe bronchospasm may be rapidly lethal. After cessation of exposure a transient improvement is generally observed; however a delayed pulmonary oedema may occur within the first 48 hours. On the following days, bacterial surinfection is a common complication. Possible long-term sequelae are reactive airways dysfunction syndrome and bronchiolitis obliterans.