Abstract
Alveolar hemorrhage and pulmonary edema induced by mechanical ventilation are partly dependent on cardiac output. Because cardiac output is low during hypothermia, we hypothesized that hypothermia may protect against these vascular manifestations of ventilator-induced lung injury. Twenty-seven Sprague-Dawley rats were assigned to either normothermia (37 ± 1°C)-injurious ventilation (NT; n = 10), hypothermia (27 ± 1°C)- injurious ventilation (HT; n = 10), or nonventilated control (n = 7). The two ventilated groups were subjected to injurious ventilation of peak airway pressure 30 cm H2O with zero end-expiratory pressure for 20 min. Compared with the NT group, the hemorrhage/congestion score of the lung (11.2 ± 1.5 vs. 4.7 ± 1.6; p < 0.001) and the ratio of wet/dry lung weight (6.1 ± 0.8 vs. 5.0 ± 0.1; p = 0.046) of the HT group were lower. Compared with the NT group, protein concentration (3,471 ± 1,985 µg/ml vs. 1,374 ± 726 µg/ml; p = 0.003) and lactate dehydrogenase level (0.43 ± 0.22 U/ml vs. 0.18 ± 0.1 U/ml; p = 0.046) in bronchoalveolar lavage fluid of the HT group were lower. Whereas pressure-volume curve was shifted to the right in the NT group after injurious ventilation, it was not shifted in the HT group. In conclusion, hypothermia in rats attenuated the degrees of vascular manifestations and alveolar epithelial injuries induced by injurious ventilation, and preserved the mechanical properties of the lung.
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This study was supported by a fund from the Asan Institute for Life Sciences (#2001-161) and a fund from the Korean Academy of Tuberculosis and Respiratory Diseases (2000).
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Lim, CM., Hong, SB., Koh, Y. et al. Hypothermia Attenuates Vascular Manifestations of Ventilator-Induced Lung Injury in Rats . Lung 181, 23–34 (2003). https://doi.org/10.1007/s00408-002-0111-x
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DOI: https://doi.org/10.1007/s00408-002-0111-x