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• W1497702956 abstract "Background: To evaluate whether myocardial strain under adenosine stress calculated from two-dimensional echocardiography by automatic frame-by-frame tracking of natural acoustic markers enables objective description of myocardial viability in clinic. Methods and Results: Two-dimensional echocardiography and two-dimensional speckle tracking imaging (2D STI) at rest were performed first and once again after adenosine was infused at 140 ug/kg/min over a period of 6 minutes in 36 stable patients with previous myocardial infarction. Then radionuclide myocardial perfusion/metabolic imaging served as the “gold standard” to define myocardial viability was given in all patients within 1 day. Two-dimensional speckle tracking images were acquired at rest and after adenosine administration. An automatic frame-by-frame tracking system of natural acoustic echocardiographic markers was used to calculate 2D strain variables including peak-systolic circumferential strain (CSpeak-sys), radial strain (RSpeak-sys), and longitudinal strain (LSpeak-sys). Those segments with abnormal motion from visual assessment of two-dimensional echocardiography were selected for further study. As a result, 126 regions were viable whereas 194 were nonviable among 320 abnormal motion segments in 36 patients according to radionuclide imaging. At rest, there were no significant changes of 2D strain between the viable and nonviable myocardium. After adenosine administration (140 ug/kg/min), CSpeak-sys had a little change of the viable myocardium while RSpeak-sys and LSpeak-sys increased significantly compared with those at rest. In nonviable group, CSpeak-sys, RSpeak-sys, and LSpeak-sys had no significant changes during adenosine administration. After adenosine administration, RSpeak-sys and LSpeak-sys in viable group increased significantly compared with nonviable group. Obtained strain data were highly reproducible and affected in small intraobserver and interobserver variabilities. A change of radial strain more than 9.5% has a sensitivity of 83.9% and a specificity of 81.4% for viable whereas a change of longitudinal strain more than 14.6% allowed a sensitivity of 86.7% and a specificity of 90.2%. Conclusions: 2D STI combined with adenosine stress echocardiography could provide a new and reliable method to identify myocardium viability. (Echocardiography 2012;29:688-694)" @default.
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• W1497702956 date "2012-04-04" @default.
• W1497702956 modified "2023-09-30" @default.
• W1497702956 title "Clinic Value of Two-Dimensional Speckle Tracking Combined with Adenosine Stress Echocardiography for Assessment of Myocardial Viability" @default.
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• W1497702956 doi "https://doi.org/10.1111/j.1540-8175.2012.01690.x" @default.
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