The Effects of Prone Position Ventilation on Experimental Mild Acute Lung Injury Induced by Intraperitoneal Lipopolysaccharide Injection in Rats

• Published in: Lung 2016-04, Vol.194 (2), p.193-199
• Main Authors: Bianchi, Aydra Mendes Almeida, Reboredo, Maycon Moura, Lucinda, Leda Marília Fonseca, Reis, Fernando Fonseca, Silva, Manfrinni Vinícius Alves, Rabelo, Maria Aparecida Esteves, Holanda, Marcelo Alcantara, Oliveira, Júlio César Abreu, Lorente, José Ángel, Pinheiro, Bruno do Valle
• Format: Article
• Language: English
• Subjects: Acute Lung Injury - blood; Acute Lung Injury - chemically induced; Acute Lung Injury - pathology; Acute Lung Injury - prevention & control; Adult respiratory distress syndrome; Animals; Care and treatment; Complications and side effects; Disease Models, Animal; Experiments; Health aspects; Influence; Injections, Intraperitoneal; Lipopolysaccharides; Lung - pathology; Lung - physiopathology; Lungs; Male; Mechanical ventilation; Medicine; Medicine & Public Health; Neutrophil Infiltration; Pneumology/Respiratory System; Pneumonia - blood; Pneumonia - chemically induced; Pneumonia - pathology; Pneumonia - prevention & control; Positive-Pressure Respiration - adverse effects; Positive-Pressure Respiration - methods; Prone Position; Rats, Wistar; Respiratory Rate; Rodents; Supine Position; Tidal Volume; Ventilation; Ventilator-Induced Lung Injury - blood; Ventilator-Induced Lung Injury - chemically induced; Ventilator-Induced Lung Injury - pathology; Ventilator-Induced Lung Injury - prevention & control
• ISSN: 0341-2040; 1432-1750
• DOI: 10.1007/s00408-016-9853-8

Introduction The benefits of prone position ventilation are well demonstrated in the severe forms of acute respiratory distress syndrome, but not in the milder forms. We investigated the effects of prone position on arterial blood gases, lung inflammation, and histology in an experimental mild acute lung injury (ALI) model. Methods ALI was induced in Wistar rats by intraperitoneal Escherichia coli lipopolysaccharide (LPS, 5 mg/kg). After 24 h, the animals with PaO 2 /FIO 2 between 200 and 300 mmHg were randomized into 2 groups: prone position ( n  = 6) and supine position ( n  = 6). Both groups were compared with a control group ( n  = 5) that was ventilated in the supine position. All of the groups were ventilated for 1 h with volume-controlled ventilation mode (tidal volume = 6 ml/kg, respiratory rate = 80 breaths/min, positive end-expiratory pressure = 5 cmH 2 O, inspired oxygen fraction = 1) Results Significantly higher lung injury scores were observed in the LPS-supine group compared to the LPS-prone and control groups (0.32 ± 0.03; 0.17 ± 0.03 and 0.13 ± 0.04, respectively) ( p