Document Detail

Effect of peak inspiratory flow on gas exchange, pulmonary mechanics, and lung histology in rabbits with injured lungs.
MedLine Citation:
PMID:  16633765     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of this study was to evaluate, using a rabbit model, the little-known effect of different levels of peak inspiratory flow on acutely injured lungs. METHODS: Fourteen male rabbits (body weight, 2,711 +/- 146 g) were anesthetized and their lungs were injured by alveolar overstretch with mechanical ventilation until Pa(O(2)) was reduced below 300 mmHg. Injured animals were randomly assigned to: the P group-to receive pressure-regulated volume-control ventilation (PRVCV; n = 7); and the V group-to receive volume-control ventilation (VCV; n = 7). Other ventilator settings were: fraction of inspired oxygen (FI(O(2)), 1.0; tidal volume, 20 ml x kg(-1); positive end-expiratory pressure (PEEP) 5 cmH(2)O; and respiratory rate, 20 min(-1). The animals were thus ventilated for 4 h. Throughout the protocol, ventilatory parameters and blood gas were measured every 30 min. After the protocol, the lung wet-to-dry ratio and histological lung injury score were evaluated in the excised lungs. RESULTS: Throughout the protocol, peak inspiratory flow and mean inspiratory flow values in the P group were significantly higher than those in the V group (26.7 +/- 5.0 l x min(-1) vs 1.2 +/- 0.2 l x min(-1), and 4.3 +/- 0.3 l x min(-1) vs 1.1 +/- 0.1 l x min(-1); P < 0.05). The wet-to-dry ratio in the P group was also significantly higher than that in the V group (7.7 +/- 0.9 vs 6.3 +/- 0.5; P < 0.05). More animals in the P group than in the V group had end-of-protocol Pa(O(2))/FI(O(2)) ratios below 200 mmHg (43% vs 0%; P = 0.06). CONCLUSION: In rabbits with injured lungs, high peak inspiratory flow with high tidal volume (V(T)) reduces the Pa(O(2))/FI(O(2)) ratio and increases the lung wet-to-dry ratio.
Yasuki Fujita; Yoshiko Maeda; Yuji Fujino; Akinori Uchiyama; Takashi Mashimo; Masaji Nishimura
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of anesthesia     Volume:  20     ISSN:  0913-8668     ISO Abbreviation:  J Anesth     Publication Date:  2006  
Date Detail:
Created Date:  2006-04-24     Completed Date:  2006-10-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8905667     Medline TA:  J Anesth     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  96-101     Citation Subset:  IM    
Intensive Care Unit, Osaka University Hospital, 2-15 Yamadaoka, Suita 565-0871, Japan.
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MeSH Terms
Blood Gas Analysis
Body Temperature / physiology
Lung / pathology*
Lung Injury*
Positive-Pressure Respiration
Prospective Studies
Pulmonary Gas Exchange*
Respiration, Artificial / adverse effects*
Respiratory Mechanics / physiology*

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