Document Detail


Inhibition of active sodium absorption leads to a net liquid secretion into in vivo rabbit lung at two levels of alveolar hypoxia.
MedLine Citation:
PMID:  11878694     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Active sodium transport across alveolar epithelium is known to contribute to the resolution of pulmonary oedema. We have attempted to assess whether sodium transport is essential to prevent liquid accumulation in healthy pulmonary alveoli exposed to mild hypoxia, and whether its contribution to liquid absorption differs between mild and moderate levels of hypoxia. In twenty-four anaesthetized adult rabbits we used direct bronchial cannulation to measure liquid movement from the liquid-filled left lung over 3.5 h. Half of the rabbits were studied at a level of mixed venous (and alveolar) oxygen partial pressure, PVO2, of 6.5 kPa and half at 4.5 kPa. PVO2 was altered by changing the inspired oxygen fraction in the ventilated right lung. Alveolar hydrostatic pressure was 0.3 kPa. In each group of 12, six animals with inhibitors of sodium transport in the isosmotic instillate were compared with six controls. We have shown an alveolar liquid secretion (approximately 0.6 microl min(-1) (kg body weight)(-1)) in the presence of inhibitors of active transport and an absorption (approximately 4 microl min(-1) (kg body weight)(-1)) in controls. Changing PVO2 had no influence on these movements. We conclude that, in this model of pulmonary oedema, active sodium transport appears to be essential for prevention of alveolar liquid accumulation via secretion. Furthermore, the contribution of active sodium transport to liquid absorption remains constant at oxygen tensions between 4.5 and 6.5 kPa.
Authors:
B Nagyova; M O'Neill; K L Dorrington
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of anaesthesia     Volume:  87     ISSN:  0007-0912     ISO Abbreviation:  Br J Anaesth     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2002-03-06     Completed Date:  2002-04-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0372541     Medline TA:  Br J Anaesth     Country:  England    
Other Details:
Languages:  eng     Pagination:  897-904     Citation Subset:  IM    
Affiliation:
University Laboratory of Physiology, Oxford, UK.
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MeSH Terms
Descriptor/Qualifier:
Absorption
Animals
Anoxia / metabolism*
Biological Transport, Active
Epithelium / metabolism
Hemodynamics
Oxygen / blood
Partial Pressure
Pulmonary Alveoli / metabolism*
Pulmonary Edema / metabolism*
Rabbits
Sodium / metabolism*
Chemical
Reg. No./Substance:
7440-23-5/Sodium; 7782-44-7/Oxygen

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


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