Variable Ventilation Improved Respiratory System mechanics and Ameliorated pulmonary Damage in a Rat Model of Lung Ischemia-Reperfusion

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art_SOLURI-MARTINS_Variable_Ventilation_Improved_Respiratory_System_mechanics_and_Ameliorated_2017.PDF (1.95 MB)
Citações na Scopus
7
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article
Data de publicação
2017
Editora
FRONTIERS MEDIA SA
DOI
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Scopus
Web of Science
PubMed
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Título do Volume
Autores
SOLURI-MARTINS, Andre
MORAES, Lillian
SANTOS, Raquel S.
SANTOS, Cintia L.
HUHLE, Robert
PELOSI, Paolo
SILVA, Pedro L.
ABREU, Marcelo Gama de
ROCCO, Patricia R. M.
Autor de Grupo de pesquisa
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Organizadores
Citação
FRONTIERS IN PHYSIOLOGY, v.8, article ID 257, 12p, 2017
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Lung ischemia-reperfusion injury remains a major complication after lung transplantation. Variable ventilation (VV) has been shown to improve respiratory function and reduce pulmonary histological damage compared to protective volume-controlled ventilation (VCV) in different models of lung injury induced by endotoxin, surfactant depletion by saline lavage, and hydrochloric acid. However, no study has compared the biological impact of VV vs. VCV in lung ischemia-reperfusion injury, which has a complex pathophysiology different from that of other experimental models. Thirty-six animals were randomly assigned to one of two groups: (1) ischemia-reperfusion (IR), in which the left pulmonary hilum was completely occluded and released after 30 min; and (2) Sham, in which animals underwent the same surgical manipulation but without hilar clamping. Immediately after surgery, the left (IR-injured) and right (contralateral) lungs from 6 animals per group were removed, and served as non-ventilated group (NV) for molecular biology analysis. IR and Sham groups were further randomized to one of two ventilation strategies: VCV (n = 6/group) [tidal volume (V-T) = 6 mL/kg, positive endexpiratory pressure (PEEP) = 2 cmH(2)O, fraction of inspired oxygen (FiO2) = 0.4]; or VV, which was applied on a breath-to-breath basis as a sequence of randomly generated V-T values (n = 1200; mean V-T = 6 mL/kg), with a 30% coefficient of variation. After 5 min of ventilation and at the end of a 2-h period (Final), respiratory systemmechanics and arterial blood gases were measured. At Final, lungs were removed for histological and molecular biology analyses. Respiratory system elastance and alveolar collapse were lower in VCV than VV (mean +/- SD, VCV 3.6 +/- 1.3 cmH20/ml and 2.0 +/- 0.8 cmH(2)O/ml, p = 0.005; median [interquartile range], VCV 20.4% [7.9-33.1] and VV 5.4% [3.1-8.8], p = 0.04, respectively). In left lungs of IR animals, VCV increased the expression of interleukin-6 and intercellular adhesion molecule-1 compared to NV, with no significant differences between VV and NV. Compared to VCV, VV increased the expression of surfactant protein-D, suggesting protection from type II epithelial cell damage. In conclusion, in this experimental lung ischemia-reperfusion model, VV improved respiratory system elastance and reduced lung damage compared to VCV.
Palavras-chave
lung ischemia-reperfusion, variable ventilation, respiratory system mechanics, inflammation, molecular biology
URI
https://observatorio.fm.usp.br/handle/OPI/21421
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MPT