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. 2021 Jul 30;22:214. doi: 10.1186/s12931-021-01811-y

Fig. 5.

Fig. 5

Expression of biomarkers associated with renal tubular epithelial cell damage [kidney injury molecule (KIM)-1 and neutrophil gelatinase-associated lipocalin (NGAL)] and inflammation [interleukin (IL)-6]. Relative gene expression was calculated as a ratio of the average gene expression levels compared with the reference gene (acidic ribosomal phosphoprotein P0, 36B4) and expressed as fold change relative to non-ventilated animals (NV). Boxes show the interquartile (25–75%) range, whiskers encompass the range (minimum to maximum), and horizontal lines represent median values of 7 animals/group. Rats received a standard (10 mL/kg/h, NORMO) or high (30 mL/kg/h, HIGH) volume of Ringer’s lactate. FAST: abrupt PEEP decrease from 9 to 3 cmH2O; SLOW: gradual PEEP decrease (0.2 cmH2O/min) from 9 to 3 cmH2O