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Circulating nitric oxide products do not solely reflect nitric oxide release in cirrhosis and portal hypertension.
MedLine Citation:
PMID:  21745317     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Background: Patients with cirrhosis often develop a systemic vasodilatation and a hyperdynamic circulation with activation of vasoconstrictor systems such as the renin-angiotensin-aldosterone system (RAAS), and vasopressin. Increased nitric oxide (NO) synthesis has been implicated in the development of this state of vasodilation and pulmonary dysfunction including increased exhaled NO concentrations. Circulating metabolites (NO(x) ) may affect the systemic and pulmonary NO-generation. However, the relations of these abnormalities to the haemodynamic changes remain unclear. Aims: The aims of the present study were to measure changes in exhaled NO in relation to circulating NO(x) , RAAS, and haemodynamics. Methods: Twenty patients (eight child class A and 12 class B patients) underwent a liver vein catheterization with determination of splanchnic and systemic haemodynamics. Circulating NO(x) and exhaled NO were determined in the supine and sitting positions and related to haemodynamics, RAAS and lung diffusing capacity (D(L) CO). Eight matched healthy individuals served as controls. Results: All patients with cirrhosis had portal hypertension. We found no significant difference in exhaled NO between patients and controls and no changes from the supine to the sitting position. Exhaled NO in the patients correlated significantly with plasma volume, heart rate and D(L) CO. NO(x) concentrations were not significantly increased in the patients. NO(x) correlated with portal pressure and haemodynamic indicators of vasodilatation, but not with exhaled NO concentrations. Conclusion: In patients with moderate cirrhosis, exhaled NO is normal. Circulating NO(x) do not seem to reflect pulmonary and systemic NO release, but NO(x) seems to reflect systemic and splanchnic haemodynamic changes in cirrhosis.
Authors:
Pia Afzelius; Nassim Bazeghi; Peter Bie; Flemming Bendtsen; Jørgen Vestbo; Søren Møller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-5
Journal Detail:
Title:  Liver international : official journal of the International Association for the Study of the Liver     Volume:  -     ISSN:  1478-3231     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101160857     Medline TA:  Liver Int     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 John Wiley & Sons A/S.
Affiliation:
Department of Clinical Physiology and Nuclear Medicine, Hvidovre Hospital, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark Department of Cardiac and Respiratory Medicine, Hvidovre Hospital, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark Institute of Molecular Medicine, University of Southern Denmark, Odense C, Denmark Department of Gastroenterology, Hvidovre Hospital, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
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