Abstract:
BACKGROUND:The authors hypothesized that low tidal volume (VT) would minimize ventilator-induced lung injury regardless of the degree of mechanical power. The authors investigated the impact of power, obtained by different combinations of VT and respiratory rate (RR), on ventilator-induced lung injury in experimental mild acute respiratory distress syndrome (ARDS). METHODS:Forty Wistar rats received Escherichia coli lipopolysaccharide intratracheally. After 24 h, 32 rats were randomly assigned to be mechanically ventilated (2 h) with a combination of different VT (6 ml/kg and 11 ml/kg) and RR that resulted in low and high power. Power was calculated as energy (ΔP,L/E,L) × RR (ΔP,L = transpulmonary driving pressure; E,L = lung elastance), and was threefold higher in high than in low power groups. Eight rats were not mechanically ventilated and used for molecular biology analysis. RESULTS:Diffuse alveolar damage score, which represents the severity of edema, atelectasis, and overdistension, was increased in high VT compared to low VT, in both low (low VT: 11 [9 to 14], high VT: 18 [15 to 20]) and high (low VT: 19 [16 to 25], high VT: 29 [27 to 30]) power groups. At high VT, interleukin-6 and amphiregulin expressions were higher in high-power than in low-power groups. At high power, amphiregulin and club cell protein 16 expressions were higher in high VT than in low VT. Mechanical energy and power correlated well with diffuse alveolar damage score and interleukin-6, amphiregulin, and club cell protein 16 expression. CONCLUSIONS:In experimental mild ARDS, even at low VT, high mechanical power promoted ventilator-induced lung injury. To minimize ventilator-induced lung injury, low VT should be combined with low power.
journal_name
Anesthesiologyjournal_title
Anesthesiologyauthors
Santos RS,Maia LA,Oliveira MV,Santos CL,Moraes L,Pinto EF,Samary CDS,Machado JA,Carvalho AC,Fernandes MVS,Martins V,Capelozzi VL,Morales MM,Koch T,Gama de Abreu M,Pelosi P,Silva PL,Rocco PRMdoi
10.1097/ALN.0000000000002143subject
Has Abstractpub_date
2018-06-01 00:00:00pages
1193-1206issue
6eissn
0003-3022issn
1528-1175journal_volume
128pub_type
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