Document Detail


Evaluation of stunned and infarcted canine myocardium by real time myocardial contrast echocardiography.
MedLine Citation:
PMID:  14576906     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Differentiation between stunned and infarcted myocardium in the setting of acute ischemia is challenging. Real time myocardial contrast echocardiography allows the simultaneous assessment of myocardial perfusion and function. In the present study we evaluated infarcted and stunned myocardium in an experimental model using real time myocardial contrast echocardiography. Sixteen dogs underwent 180 min of coronary occlusion followed by reperfusion (infarct model) and seven other dogs were submitted to 20 min of coronary occlusion followed by reperfusion (stunned model). Wall motion abnormality and perfusional myocardial defect areas were measured by planimetry. Risk and infarct areas were determined by tissue staining. In the infarct model, the wall motion abnormality area during coronary occlusion (5.52 1.14 cm(2) ) was larger than the perfusional myocardial defect area (3.71 1.45 cm (2); P < 0.001). Reperfusion resulted in maintenance of wall motion abnormality (5.45 1.41 cm (2); P = 0.43 versus occlusion) and reduction of perfusional myocardial defect (1.51 1.29 cm (2); P = 0.004 versus occlusion). Infarct size determined by contrast echocardiography correlated with tissue staining (r = 0.71; P = 0.002). In the stunned model, the wall motion abnormality area was 5.49 0.68 cm (2) during occlusion and remained 5.1 0.63 cm (2) after reperfusion (P = 0.07). Perfusional defect area was 2.43 0.79 cm (2) during occlusion and was reduced to 0.2 0.53 cm(2) after reperfusion (P = 0.04). 2,3,5-Triphenyl tetrazolium chloride staining confirmed the absence of necrotic myocardium in all dogs in the stunned model. Real time myocardial contrast echocardiography is a noninvasive technique capable of distinguishing between stunned and infarcted myocardium after acute ischemia.
Authors:
P M M Dourado; J M Tsutsui; W Mathias; J L Andrade; P L da Luz; A C P Chagas
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-10-22
Journal Detail:
Title:  Brazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas / Sociedade Brasileira de Biofísica ... [et al.]     Volume:  36     ISSN:  0100-879X     ISO Abbreviation:  Braz. J. Med. Biol. Res.     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-10-24     Completed Date:  2004-02-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8112917     Medline TA:  Braz J Med Biol Res     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  1501-9     Citation Subset:  IM    
Affiliation:
Instituto do Coraço, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil. antonio.chagas@incor.usp.br
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MeSH Terms
Descriptor/Qualifier:
Animals
Coloring Agents / diagnostic use
Contrast Media
Disease Models, Animal
Dogs
Echocardiography / methods
Fluorocarbons / diagnostic use
Myocardial Infarction / pathology,  ultrasonography*
Myocardial Stunning / pathology,  ultrasonography
Risk Factors
Staining and Labeling
Tetrazolium Salts / diagnostic use
Chemical
Reg. No./Substance:
0/Coloring Agents; 0/Contrast Media; 0/Fluorocarbons; 0/Tetrazolium Salts; 902-00-1/triphenyltetrazolium

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