Ana Fernandez-Bustamante1, Jelena Klawitter, John E Repine, Amanda Agazio, Allison J Janocha, Chirag Shah, Marc Moss, Ivor S Douglas, Zung Vu Tran, Serpil C Erzurum, Uwe Christians, Tamas Seres. 1. From the Department of Anesthesiology and Webb-Waring Center, University of Colorado School of Medicine, Aurora, Colorado (A.F.-B.); Department of Anesthesiology and iC42 Integrated Solutions in Systems Biology, University of Colorado School of Medicine, Aurora, Colorado (J.K., U.C.); Department of Medicine and Webb-Waring Center, University of Colorado School of Medicine, Aurora, Colorado (J.E.R.); Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado (A.A., T.S.); Department of Pathobiology and Lerner Research Institute (NC22), the Cleveland Clinic Foundation and Case Western Reserve University School of Medicine, Cleveland, Ohio (A.J.J., S.C.E.); Case Western Reserve University School of Medicine, Cleveland, Ohio (C.S.); Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado (M.M., I.S.D.); and Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, Colorado (Z.V.T.).
Abstract
BACKGROUND: The early biological impact of short-term mechanical ventilation on healthy lungs is unknown. The authors aimed to characterize the immediate tidal volume (VT)-related changes on lung injury biomarkers in patients with healthy lungs and low risk of pulmonary complications. METHODS:Twenty-eight healthy patients for knee replacement surgery were prospectively randomized to volume-controlled ventilation with VT 6 (VT6) or 10 (VT10) ml/kg predicted body weight. General anesthesia and other ventilatory parameters (positive end-expiratory pressure, 5 cm H2O, FIO2, 0.5, respiratory rate titrated for normocapnia) were managed similarly in the two groups. Exhaled breath condensate and blood samples were collected for nitrite, nitrate, tumor necrosis factor-α, interleukins-1β, -6, -8, -10, -11, neutrophil elastase, and Clara Cell protein 16 measurements, at the onset of ventilation and 60 min later. RESULTS: No significant differences in biomarkers were detected between the VT groups at any time. The coefficient of variation of exhaled breath condensate nitrite and nitrate decreased in the VT6 but increased in the VT10 group after 60-min ventilation. Sixty-minute ventilation significantly increased plasma neutrophil elastase levels in the VT6 (35.2 ± 30.4 vs. 56.4 ± 51.7 ng/ml, P = 0.008) and Clara Cell protein 16 levels in the VT10 group (16.4 ± 8.8 vs. 18.7 ± 9.5 ng/ml, P = 0.015). Exhaled breath condensate nitrite correlated with plateau pressure (r = 0.27, P = 0.042) and plasma neutrophil elastase (r = 0.44, P = 0.001). Plasma Clara Cell protein 16 correlated with compliance (r = 0.34, P = 0.014). CONCLUSIONS: No tidal volume-related changes were observed in the selected lung injury biomarkers of patients with healthy lungs after 60-min ventilation. Plasma neutrophil elastase andplasma Clara Cell protein 16 might indicate atelectrauma and lung distention, respectively.
RCT Entities:
BACKGROUND: The early biological impact of short-term mechanical ventilation on healthy lungs is unknown. The authors aimed to characterize the immediate tidal volume (VT)-related changes on lung injury biomarkers in patients with healthy lungs and low risk of pulmonary complications. METHODS: Twenty-eight healthy patients for knee replacement surgery were prospectively randomized to volume-controlled ventilation with VT 6 (VT6) or 10 (VT10) ml/kg predicted body weight. General anesthesia and other ventilatory parameters (positive end-expiratory pressure, 5 cm H2O, FIO2, 0.5, respiratory rate titrated for normocapnia) were managed similarly in the two groups. Exhaled breath condensate and blood samples were collected for nitrite, nitrate, tumor necrosis factor-α, interleukins-1β, -6, -8, -10, -11, neutrophil elastase, and Clara Cell protein 16 measurements, at the onset of ventilation and 60 min later. RESULTS: No significant differences in biomarkers were detected between the VT groups at any time. The coefficient of variation of exhaled breath condensate nitrite and nitrate decreased in the VT6 but increased in the VT10 group after 60-min ventilation. Sixty-minute ventilation significantly increased plasma neutrophil elastase levels in the VT6 (35.2 ± 30.4 vs. 56.4 ± 51.7 ng/ml, P = 0.008) and Clara Cell protein 16 levels in the VT10 group (16.4 ± 8.8 vs. 18.7 ± 9.5 ng/ml, P = 0.015). Exhaled breath condensate nitrite correlated with plateau pressure (r = 0.27, P = 0.042) and plasma neutrophil elastase (r = 0.44, P = 0.001). Plasma Clara Cell protein 16 correlated with compliance (r = 0.34, P = 0.014). CONCLUSIONS: No tidal volume-related changes were observed in the selected lung injury biomarkers of patients with healthy lungs after 60-min ventilation. Plasma neutrophil elastase and plasma Clara Cell protein 16 might indicate atelectrauma and lung distention, respectively.
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