Document Detail


The artificially ventilated preterm rabbit neonate as experimental model of hyaline membrane disease.
MedLine Citation:
PMID:  7048842     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Bronchiolar epithelial lesions, similar to those in human hyaline membrane disease (HMD), can be induced by artificial ventilation of newborn rabbits, delivered on day 27 of gestation. As verified by electron microscopy, these epithelial lesions develop within only 1-5 min of artificial ventilation. Tracheal instillation of natural surfactant at birth improves lung-thorax compliance in these animals, enhances the aeration of the alveolar compartment, and prevents the development of bronchiolar epithelial lesions. This prophylactic effect is obtained even when the compliant lungs of the surfactant-treated animals are greatly overventilated, i.e. when the ventilator is set at standardized high insufflation pressure. The application of a low positive end-expiratory pressure (5 cmH2O) also results in increased lung-thorax compliance, and reduces the extent of bronchiolar epithelial lesions. These findings suggest that the epithelial lesions are secondary to an abnormal expansion pattern. In a premature neonate with surfactant deficiency, overdistension of airways and irregular aeration of the alveolar compartment might produce shear stress in the airway mucosa leading to disruption of the epithelium and formation of hyaline membranes. The same mechanism is probably also involved in the pathogenesis of the epithelial lesions in human neonatal HMD.
Authors:
R Nilsson
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  26     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  1982 Apr 
Date Detail:
Created Date:  1982-09-17     Completed Date:  1982-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  89-103     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Animals
Animals, Newborn*
Disease Models, Animal*
Humans
Hyaline Membrane Disease / etiology,  pathology,  therapy,  veterinary*
Infant, Newborn
Intermittent Positive-Pressure Ventilation / veterinary
Lung / pathology
Necrosis
Plethysmography / veterinary
Positive-Pressure Respiration
Pulmonary Surfactants / deficiency,  therapeutic use
Rabbits*
Respiration, Artificial / adverse effects,  veterinary
Surface-Active Agents / therapeutic use
Chemical
Reg. No./Substance:
0/Pulmonary Surfactants; 0/Surface-Active Agents

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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