| Optimizing alveolar expansion prolongs the effectiveness of exogenous surfactant therapy in the adult rabbit. | |
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MedLine Citation:
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PMID: 8368625 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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) |
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Authors:
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A B Froese; P R McCulloch; M Sugiura; S Vaclavik; F Possmayer; F Moller |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American review of respiratory disease Volume: 148 ISSN: 0003-0805 ISO Abbreviation: Am. Rev. Respir. Dis. Publication Date: 1993 Sep |
Date Detail:
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Created Date: 1993-10-07 Completed Date: 1993-10-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370523 Medline TA: Am Rev Respir Dis Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 569-77 Citation Subset: AIM; IM |
Affiliation:
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Department of Anaesthesia, Queen's University, Kingston, Ontario, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Animals Bronchoalveolar Lavage Fluid / chemistry Drug Evaluation, Preclinical Lung / chemistry Phospholipids / analysis Pulmonary Alveoli / physiology* Pulmonary Gas Exchange Pulmonary Surfactants / deficiency, therapeutic use* Rabbits Random Allocation Respiration, Artificial / instrumentation, methods*, statistics & numerical data Respiratory Mechanics Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Phospholipids; 0/Pulmonary Surfactants |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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