Document Detail


Assessment of myocardial ischemic memory using persistence of post-systolic thickening after recovery from ischemia.
MedLine Citation:
PMID:  19909928     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: We sought to investigate the time course of post-systolic thickening (PST) and systolic abnormality after recovery from brief myocardial ischemia. BACKGROUND: Myocardial ischemic memory imaging, denoting the visualization of abnormalities provoked by ischemia and sustained even after restoration of perfusion, is desirable and allows after-the-fact recognition of ischemic insult. PST offers a sensitive marker of myocardial ischemia, but whether this abnormal thickening remains after relief from brief ischemia is unclear. METHODS: Tissue strain echocardiographic data were acquired from 27 dogs under 2 different conditions of myocardial ischemia induced by either brief coronary occlusion (15 or 5 min) followed by reperfusion (Protocol 1) or by dobutamine stress during nonflow-limiting stenosis (Protocol 2). Peak systolic strain and post-systolic strain index (PSI), a parameter of PST, were analyzed. RESULTS: In Protocol 1, peak systolic strain was significantly decreased in the risk area during occlusion. This decrease in peak systolic strain in the 15-min group did not completely recover to baseline levels even 120 min after reperfusion, whereas the decrease in the 5-min group recovered immediately after reperfusion. We found that PSI was significantly increased during occlusion, but increased PSI in the 5-min group remained until 30 min after reperfusion (-0.19 +/- 0.18 [baseline] vs. 0.19 +/- 0.14 [30 min], p < 0.05) despite the rapid recovery of peak systolic strain. In Protocol 2, increased PSI was sustained until 20 min after the end of dobutamine infusion (-0.26 +/- 0.11 [baseline] vs. -0.16 +/- 0.10 [20 min], p < 0.05), although peak systolic strain recovered by 5 min after the end of dobutamine infusion. CONCLUSIONS: PST remained longer than abnormal peak systolic strain after recovery from ischemia. Assessment of PST may be valuable for detecting myocardial ischemic memory.
Authors:
Toshihiko Asanuma; Ayumi Uranishi; Kasumi Masuda; Fuminobu Ishikura; Shintaro Beppu; Satoshi Nakatani
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  JACC. Cardiovascular imaging     Volume:  2     ISSN:  1876-7591     ISO Abbreviation:  JACC Cardiovasc Imaging     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-11-13     Completed Date:  2010-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101467978     Medline TA:  JACC Cardiovasc Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1253-61     Citation Subset:  IM    
Affiliation:
Department of Functional Diagnostic Science, Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Osaka, Japan. toshi@sahs.med.osaka-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure
Disease Models, Animal
Dogs
Echocardiography, Doppler, Color
Heart Rate
Myocardial Contraction*
Myocardial Ischemia / physiopathology*,  ultrasonography
Myocardium / pathology
Necrosis
Observer Variation
Recovery of Function
Reproducibility of Results
Systole
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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