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Exogenous carbon monoxide does not affect cell membrane energy availability assessed by sarcolemmal calcium fluxes during myocardial ischaemia-reperfusion in the pig.
MedLine Citation:
PMID:  20811288     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Carbon monoxide is thought to be cytoprotective and may hold therapeutic promise for mitigating ischaemic injury. The purpose of this study was to test low-dose carbon monoxide for protective effects in a porcine model of acute myocardial ischaemia and reperfusion.In acute open-thorax experiments in anaesthetised pigs, pretreatment with low-dose carbon monoxide (5% increase in carboxyhaemoglobin) was conducted for 120 min before localised ischaemia (45 min) and reperfusion (60 min) was performed using a coronary snare. Metabolic and injury markers were collected by microdialysis sampling in the ventricular wall. Recovery of radio-marked calcium delivered locally by microperfusate was measured to assess carbon monoxide treatment effects during ischaemia/reperfusion on the intracellular calcium pool.Coronary occlusion and ischaemia/reperfusion were analysed for 16 animals (eight in each group). Changes in glucose, lactate and pyruvate from the ischaemic area were observed during ischaemia and reperfusion interventions, though there was no difference between carbon monoxide-treated and control groups during ischaemia or reperfusion. Similar results were observed for glycerol and microdialysate Ca recovery.These findings show that a relatively low and clinically relevant dose of carbon monoxide did not seem to provide acute protection as indicated by metabolic, energy-related and injury markers in a porcine myocardial ischaemia/reperfusion experimental model. We conclude that protective effects of carbon monoxide related to ischaemia/reperfusion either require higher doses of carbon monoxide or occur later after reperfusion than the immediate time frame studied here. More study is needed to characterise the mechanism and time frame of carbon monoxide-related cytoprotection.
Authors:
Katarina Ahlström; Björn Biber; Anna-Maja Aberg; Pernilla Abrahamsson; Göran Johansson; Gunnar Ronquist; Anders Waldenström; Michael F Haney
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of anaesthesiology     Volume:  28     ISSN:  1365-2346     ISO Abbreviation:  Eur J Anaesthesiol     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-04-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8411711     Medline TA:  Eur J Anaesthesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  356-62     Citation Subset:  IM    
Affiliation:
From the Anesthesia and Intensive Care Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg (KA, BB), Anesthesia and Intensive Care Medicine, Umeå University (A-MÅ, PA, MFH), Anesthesia and Intensive Care Medicine, University Hospital of Umeå (GJ), Umeå, Department of Medical Chemistry, Uppsala University, Uppsala (GR) and Department of Cardiology, Umeå University, Umeå (AW), Sweden.
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