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Evidence for antioxidants consumption in the coronary blood of patients with an acute myocardial infarction.
MedLine Citation:
PMID:  22797906     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Blood flow arrest and reperfusion during myocardial infarction (MI) cause myocyte and endothelium injury through oxidative stress and inflammation, both of which involve Reactive Oxygen Species (ROS) and peroxides that consume antioxidant defenses. The aim of this study was to determine whether serum from the occluded coronary vessel has impaired anti-oxidative defenses as compared to serum from aortic blood or from the periphery of healthy controls. Forty-seven patients (44 men) were included for study. Inclusion criteria were chest pain, ST elevation, and cardiac troponin increase. A photoreaction producing a standardized amount of singlet oxygen ((1)O(2)), an excited form of oxygen, was performed in serum samples obtained during primary percutaneous coronary intervention (PCI). Immediately after laser light delivery to 5 % sera containing 5 µg/mL rose bengal, dichloro-dihydro-fluorescein (DCFH) was added and its post-oxidation transformation into the fluorescent DCF, was recorded. At least 5 h after the start of symptoms, the mean secondary ROS production after (1)O(2) delivery was increased in coronary sera (p < 0.001), but in aortic blood remained similar to that of healthy controls. The peak troponin value correlated with DCF fluorescence throughout the interval between symptoms onset and PCI. A high fluorescence was associated with a higher risk of MACE. These results show that oxidants secondary to (1)O(2) are increased in occluded vessels during AMI in parallel to c-troponin, demonstrating that antioxidants are consumed. A O(2) increase during reperfusion would thus extend the damage resulting from IDM necrosis. The effect of conditioning during PCI could be studied using the described method.
Authors:
Patrice Guerin; Edith Bigot; Thierry Patrice
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-14
Journal Detail:
Title:  Journal of thrombosis and thrombolysis     Volume:  -     ISSN:  1573-742X     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9502018     Medline TA:  J Thromb Thrombolysis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Institut du Thorax, Service d'Hémodynamique, Laënnec Hospital, 44093, Nantes, France.
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