Abstract:
:Increases in regional myocardial blood flow (Qm) developing soon after myocardial infarction may minimize myocardial necrosis. To test this hypothesis, Qm in the area surrounding an acutely occluded coronary artery was determined successively over 4 weeks in 11 dogs. Non-radioactive colored microspheres were injected into the left atrium 5 s (Qm at this time is referred to as Q1), 3 h (Q2), 12 h (Q3), and 4 weeks (Q4) after occlusion of the coronary artery. After termination of the experiment, the heart was removed, and Qm and three indices of myocardial necrosis i.e., myocardial creatine kinase activity (CK), infarct size determined by triphenyl tetrazolium chloride stain (TTC), and myocardial fibrosis visualized by Azan-Mallory stain, were determined. Each Qm was expressed as a percentage of normal: Qm (% of normal) = [Q/Qc] ischemic area/[Q'/Qc']non-ischemic area x 100, where Qc indicates Qm determined before coronary occlusion. In the ischemic area of the left ventricle, Q1, Q2, Q3, and Q4 were 25 +/- 3%, 30 +/- 3%, 31 +/- 3%, and 42 +/- 3% of normal, respectively, in the inner layer, and 31 +/- 3%, 52 +/- 4%, 52 +/- 4%, and 77 +/- 6% of normal, respectively, in the outer layers. During the 4-week period, the increase of Qm in the outer layer was greater than that in the inner layer. The inner layer showed a small increase of flow from Q3 to Q4 (9 +/- 2%), but in the outer layer there were greater flow increases from Q1 to Q2 (21 +/- 3%) and from Q3 to Q4 (24 +/- 6%).(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Heart Vesselsjournal_title
Heart and vesselsauthors
Nakai S,Ishikawa K,Ogawa I,Koka H,Kamata N,Akiyama H,Katori Rdoi
10.1007/BF01744982subject
Has Abstractpub_date
1995-01-01 00:00:00pages
171-7issue
4eissn
0910-8327issn
1615-2573journal_volume
10pub_type
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journal_title:Heart and vessels
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journal_title:Heart and vessels
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journal_title:Heart and vessels
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journal_title:Heart and vessels
pub_type: 杂志文章
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更新日期:2006-09-01 00:00:00
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journal_title:Heart and vessels
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journal_title:Heart and vessels
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journal_title:Heart and vessels
pub_type: 杂志文章
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