Document Detail


Cardiopulmonary effects of unilateral airway pressure changes in intact infant lambs.
MedLine Citation:
PMID:  6373696     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Direct effects of airway pressure changes on the pulmonary vascular bed of the intact infant lamb were studied under chloralose anesthesia using a preparation developed to permit independent ventilation of right and left lungs and independent measurement of right and left lung blood flow. A specially designed endobronchial tube eliminated the need for thoracotomy the day of study. Unilateral changes in positive end-expiratory pressure (PEEP) during volume-regulated ventilation increased ipsilateral but not contralateral airway pressure, confirming adequate separation of right and left lungs and suggesting rigidity of the mediastinum. Such interventions ( UPEEP ) at levels of 5, 10, and 15 cmH2O reduced ipsilateral but not contralateral pulmonary blood flow (by 10, 25, and 46%, respectively) but did not alter end-tidal PCO2 of either lung. UPEEP had less effect on cardiac output, stroke volume, right atrial, left atrial, esophageal, and pulmonary arterial pressures than did PEEP applied to both lungs. Because this preparation separates the predominantly direct effects of UPEEP on the ipsilateral lung from its indirect effects on the contralateral lung, it is well suited to studies of direct pulmonary vascular effects of airway pressure changes in an intact closed-chest preparation with reactive pulmonary vasculature.
Authors:
B P Fuhrman; J Everitt; J E Lock
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  56     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1984 May 
Date Detail:
Created Date:  1984-07-16     Completed Date:  1984-07-16     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1439-48     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Airway Resistance
Animals
Animals, Newborn
Blood Pressure
Cardiac Output
Hemodynamics*
Oxygen / blood
Positive-Pressure Respiration*
Pulmonary Circulation
Pulmonary Gas Exchange
Respiration*
Sheep
Vascular Resistance
Grant Support
ID/Acronym/Agency:
HL-28241/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

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


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