01-06-2009 | Experimental
Effects of frequency and inspiratory plateau pressure during recruitment manoeuvres on lung and distal organs in acute lung injury
Published in: Intensive Care Medicine | Issue 6/2009
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Purpose
To evaluate the effects of frequency and inspiratory plateau pressure (Pplat) during recruitment manoeuvres (RMs) on lung and distal organs in acute lung injury (ALI).
Methods
We studied paraquat-induced ALI rats. At 24 h, rats were anesthetized and RMs were applied using continuous positive airway pressure (CPAP, 40 cmH2O/40 s) or three-different sigh strategies: (a) 180 sighs/h and Pplat = 40 cmH2O (S180/40), (b) 10 sighs/h and Pplat = 40 cmH2O (S10/40), and (c) 10 sighs/h and Pplat = 20 cmH2O (S10/20).
Results
S180/40 yielded alveolar hyperinflation and increased lung and kidney epithelial cell apoptosis as well as type III procollagen (PCIII) mRNA expression. S10/40 resulted in a reduction in epithelial cell apoptosis and PCIII expression. Static elastance and alveolar collapse were higher in S10/20 than S10/40.
Conclusions
The reduction in sigh frequency led to a protective effect on lung and distal organs, while the combination with reduced Pplat worsened lung mechanics and histology.