Document Detail


Nitric oxide increases dramatically in air exhaled from lung regions with occluded vessels.
MedLine Citation:
PMID:  12648198     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: We observed dramatic changes in exhaled nitric oxide concentration (DeltaNOE) during wedge measurements, and hypothesised that occlusion and redistribution of pulmonary blood flow affects NOE. METHODS: We inflated the balloon of the pulmonary artery catheter and measured NOE and central hemodynamics in closed chest anesthetised pigs (n = 11) ventilated with hyperoxic gas (fraction of inspired oxygen [FIO2] = 0.5), before and during lung injury, and in open chest anesthetised pigs (n = 17) before and during left lower lobar (LLL) hypoxia (FIO2 0.05), and during hyperoxic (FIO2 0.8) ventilation of the other lung regions (HL). RESULTS: In the closed chest pigs NOE increased from 2.0 (0.9) to 3.4 (2.0) p.p.b. (P < 0.001) during wedge, and returned to 2.0 (1.0) p.p.b. when the balloon was deflated. The increase in mean pulmonary artery pressure (MPaP) during wedge was small and insignificant (P > 0.07). When the balloon was inflated in the right pulmonary artery in the open chest pigs, the perfusion of the HL decreased from 2.57 (0.58) to 2.34 (0.55) l min(-1) (P < 0.001), and NOEHL increased from 2.5 (0.9) to 6.2 (3.2) p.p.b. (P < 0.001). The perfusion of the LLL increased from 0.33 (0.26) to 0.54 (0.34) l min(-1) (P < 0.001), and NOELLL decreased from 1.7 (0.6) to 1.5 (0.5) p.p.b. (P < 0.001). Neither lung injury nor LLL hypoxia had any influence on DeltaNOE (P > 0.07) during wedge. The correlation coefficient (R2) was 0.66 between changes in regional blood flow and DeltaNOE, and 0.37 between changes in MPaP and DeltaNOE. CONCLUSIONS: Nitric oxide concentration increases dramatically from lung regions with occluded vessels, whereas changes in MPaP have minor effects on NOE. This is an important fact to consider when comparing NOE within or between studies, and indicates a possible marker of diseases with occluded lung vessels.
Authors:
E Fernández-Mondéjar; K Hambraeus-Jonzon; A Ronéus; G Hedenstierna
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  47     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  2003 Mar 
Date Detail:
Created Date:  2003-03-21     Completed Date:  2003-06-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  312-8     Citation Subset:  IM    
Affiliation:
Virgen de Las Nievas Hospital, Department of Emergency and Critical Care Medicine, Granada, Spain.
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MeSH Terms
Descriptor/Qualifier:
Anesthesia
Animals
Balloon Dilatation
Cardiac Output / physiology
Lung / metabolism*
Nitric Oxide / metabolism*
Pulmonary Artery / physiology*
Pulmonary Circulation / physiology
Pulmonary Wedge Pressure
Respiration, Artificial
Swine
Tracheotomy
Chemical
Reg. No./Substance:
10102-43-9/Nitric Oxide

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