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Prediction of Salvaged Myocardium in Patients with Acute Myocardial Infarction after Primary Percutaneous Coronary Angioplasty using early Thallium-201 Redistribution Myocardial Perfusion Imaging  

Choi, Joon-Young (Departments of Nuclear Medicine Asan Medical Center, University of Ulsan College of Medicine)
Yang, You-Jung (Departments of Nuclear Medicine Asan Medical Center, University of Ulsan College of Medicine)
Choi, Seung-Jin (Departments of Nuclear Medicine Asan Medical Center, University of Ulsan College of Medicine)
Yeo, Jeong-Seok (Departments of Nuclear Medicine Asan Medical Center, University of Ulsan College of Medicine)
Park, Seong-Wook (Departments of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine)
Song, Jae-Kwan (Departments of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine)
Moon, Dae-Hyuk (Departments of Nuclear Medicine Asan Medical Center, University of Ulsan College of Medicine)
Publication Information
The Korean Journal of Nuclear Medicine / v.37, no.4, 2003 , pp. 219-228 More about this Journal
Abstract
Purpose: The amount of salvaged myocardium is an important prognostic factor in patients with acute myocardial infarction (MI). We investigated if early Tl-201 SPECT imaging could be used to predict the salvaged myocardium and functional recovery in acute MI after primary PTCA. Materials and Methods: In 36 patients with first acute MI treated with primary PTCA, serial echocardiography and Tl-201 SPECT imaging ($5.8{\pm}2.1$ days after PTDA) were performed. Regional wall motion and perfusion were quantified with on 16-segment myocardial model with 5-point and 4-point scaling system, respectively. Results: Wall motion was improved in 78 of the 212 dyssynergic segments on 1 month follow-up echocardiography and 97 on 7 months follow-up echocardiography, which were proved to be salvaged myocardium. The areas under receiver operating characteristic curves of Tl-201 perfusion score for detecting salvaged myocardial segments were 0.79 for 1 month follow-up and 0.83 for 7 months follow-up. The sensitivity and specificity of Tl-201 redistribution images with optimum cutoff of 40% of peak thallium activity for detecting salvaged myocardium were 84.6% and 55.2% for 1 month follow-up, and 87.6% and 64.3% for 7 months follow-up, respectively. There was a linear relationship between the percentage of peak thallium activity on early redistribution imaging and the likelihood of segmental functional improvement 7 months after reperfusion. Conclusion: Tl-201 myocardial perfusion SPECT imaging performed early within 10 days after reperfusion can be used to predict the salvaged myocardium and functional recovery with high sensitivity during the 7 months following primary PTCA in patients with acute MI.
Keywords
Thallium-201; myocardial perfusion SPECT; acute myocardial infarction; primary percutaneous transluminal coronary angioplasty;
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