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C57BL\/6 mice were anesthetized and aspirated 75 \u03bcl of HCl (pH 1.8) or buffered normal saline. Subgroups were reanesthetized 4, 14, 24, and 48 h later. Following DI, tissue damping (G) and elastance (H) were measured periodically at PEEP of 1, 3, and 6 cmH<jats:sub>2<\/jats:sub>O, and air within the lung (thoracic gas volume) was quantified by microcomputed tomography. Following DI, G and H increased with time during progressive lung derecruitment, the latter confirmed by microcomputed tomography. The rise in H was greater in acid-injured mice than in controls ( P &lt; 0.05) and also increased from 4 to 48 h after acid aspiration, reflecting progressively worsening injury. The rise in H was reduced by PEEP, but this effect was significantly blunted by 48 h ( P &lt; 0.05), also confirmed by thoracic gas volume. Lung permeability and alveolar fibrin also increased over the 48-h study period, accompanied by increasing levels and transcription of the fibrinolysis inhibitor plasminogen activator inhibitor-1. Lung injury worsens progressively in mice during the 48 h following acid aspiration. 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