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The physical basis of ventilator-induced lung injury Plataki M; Hubmayr RDExpert Rev Respir Med 2010[Jun]; 4 (3): 373-85Although mechanical ventilation (MV) is a life-saving intervention for patients with acute respiratory distress syndrome (ARDS), it can aggravate or cause lung injury, known as ventilator-induced lung injury (VILI). The biophysical characteristics of heterogeneously injured ARDS lungs increase the parenchymal stress associated with breathing, which is further aggravated by MV. Cells, in particular those lining the capillaries, airways and alveoli, transform this strain into chemical signals (mechanotransduction). The interaction of reparative and injurious mechanotransductive pathways leads to VILI. Several attempts have been made to identify clinical surrogate measures of lung stress/strain (e.g., density changes in chest computed tomography, lower and upper inflection points of the pressure-volume curve, plateau pressure and inflammatory cytokine levels) that could be used to titrate MV. However, uncertainty about the topographical distribution of stress relative to that of the susceptibility of the cells and tissues to injury makes the existence of a single 'global' stress/strain injury threshold doubtful.|*Mechanotransduction, Cellular[MESH]|Animals[MESH]|Biomechanical Phenomena[MESH]|Clinical Trials as Topic[MESH]|Evidence-Based Medicine[MESH]|Humans[MESH]|Lung/pathology/*physiopathology[MESH]|Pressure[MESH]|Respiration, Artificial/*adverse effects[MESH]|Respiratory Distress Syndrome/pathology/physiopathology/*therapy[MESH]|Stress, Mechanical[MESH]|Ventilator-Induced Lung Injury/etiology/pathology/*physiopathology[MESH] |
