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However, MV itself can trigger ventilator\u2010associated lung injury in patients. We hypothesized that the mechanisms of lung injury through redox imbalance might also be associated with pulmonary inflammatory status, which has not been so far described. We tested it by delivering different tidal volumes to normal lungs undergoing MV. Healthy Wistar rats were divided into spontaneously breathing animals (control group, CG), and rats were submitted to MV (controlled ventilation mode) with tidal volumes of 4\u2009mL\/kg (MVG4), 8\u2009mL\/kg (MVG8), or 12\u2009mL\/kg (MVG12), zero end\u2010expiratory pressure (ZEEP), and normoxia (FiO<jats:sub>2<\/jats:sub> = 21<jats:italic>%<\/jats:italic>) for 1 hour. After ventilation and euthanasia, arterial blood, bronchoalveolar lavage fluid (BALF), and lungs were collected for subsequent analysis. MVG12 presented lower PaCO<jats:sub>2<\/jats:sub> and bicarbonate content in the arterial blood than CG, MVG4, and MVG8. Neutrophil influx in BALF and MPO activity in lung tissue homogenate were significantly higher in MVG12 than in CG. The levels of CCL5, TNF\u2010<jats:italic>\u03b1<\/jats:italic>, IL\u20101, and IL\u20106 in lung tissue homogenate were higher in MVG12 than in CG and MVG4. In the lung parenchyma, the lipid peroxidation was more important in MVG12 than in CG, MVG4, and MVG8, while there was more protein oxidation in MVG12 than in CG and MVG4. The stereological analysis confirmed the histological pulmonary changes in MVG12. The association of controlled mode ventilation and high tidal volume, without PEEP and normoxia, impaired pulmonary histoarchitecture and triggered redox imbalance and lung inflammation in healthy adult rats.<\/jats:p>","DOI":"10.1155\/2021\/5196896","type":"journal-article","created":{"date-parts":[[2021,10,30]],"date-time":"2021-10-30T02:20:09Z","timestamp":1635560409000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Different Tidal Volumes May Jeopardize Pulmonary Redox and Inflammatory Status in Healthy Rats Undergoing Mechanical Ventilation"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6324-7698","authenticated-orcid":false,"given":"Leandro da Silva","family":"C\u00e2ndido","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2535-2737","authenticated-orcid":false,"given":"Nat\u00e1lia 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