Document Detail

Optimizing alveolar expansion prolongs the effectiveness of exogenous surfactant therapy in the adult rabbit.
MedLine Citation:
PMID:  8368625     Owner:  NLM     Status:  MEDLINE    
We evaluated four ventilator patterns after the administration of 80 mg/kg bovine lipid extract surfactant (LES) to anesthetized, paralyzed, saline-lavaged New Zealand white rabbits. Two ventilator types were compared: high frequency oscillatory ventilation (HFO) versus conventional mechanical ventilation (CMV), each at high (HI) and low (LO) end-expiratory lung volumes (EELV); n = 6, each group; treatment duration = 4 h. Target PaO2 ranges were > 350 mm Hg for groups with high EELV (i.e., HFO-HI and CMV-HI) and 70 to 100 mm Hg for those with low EELV (i.e., HFO-LO and CMV-LO). Ventilator pressures were limited to < or = 39/9 cm H2O in the CMV-HI group. Five of six CMV-HI-treated animals did not maintain target PaO2 levels. Both ventilator type and strategy influenced outcome significantly. Animals managed with HFO had higher mean arterial pressures (p = 0.004), lower mean airway pressures (Paw) (p < 0.00008) and HCO3- requirements (p < 0.02), larger inflation (p = 0.003) and deflation (p < 0.00001) respiratory system volumes at 10 cm inflation pressure, and higher lung lamellar body (p = 0.0006) and lavage fluid (p = 0.003) phospholipid quantities than did CMV-treated animals. The deflation P-V curve (p = 0.0004), lamellar body (p < 0.00001) and lavage fluid (p = 0.0002) phospholipid levels were superior after the high EELV strategy. We conclude that ventilator pattern strongly influences exogenous surfactant efficacy. Benefits arise from keeping EELV high enough to prevent atelectasis and using small (approximately 2 ml/kg) tidal volumes to prevent overdistension.(ABSTRACT TRUNCATED AT 250 WORDS)
A B Froese; P R McCulloch; M Sugiura; S Vaclavik; F Possmayer; F Moller
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American review of respiratory disease     Volume:  148     ISSN:  0003-0805     ISO Abbreviation:  Am. Rev. Respir. Dis.     Publication Date:  1993 Sep 
Date Detail:
Created Date:  1993-10-07     Completed Date:  1993-10-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370523     Medline TA:  Am Rev Respir Dis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  569-77     Citation Subset:  AIM; IM    
Department of Anaesthesia, Queen's University, Kingston, Ontario, Canada.
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MeSH Terms
Analysis of Variance
Bronchoalveolar Lavage Fluid / chemistry
Drug Evaluation, Preclinical
Lung / chemistry
Phospholipids / analysis
Pulmonary Alveoli / physiology*
Pulmonary Gas Exchange
Pulmonary Surfactants / deficiency,  therapeutic use*
Random Allocation
Respiration, Artificial / instrumentation,  methods*,  statistics & numerical data
Respiratory Mechanics
Time Factors
Reg. No./Substance:
0/Phospholipids; 0/Pulmonary Surfactants

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