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摘要
Objectives: The aim of this study was to determine the feasibility of multi-slice computed tomography (MSCT) biphasic imaging in assessing myocardial viability and infarct parameters in both acutely and chronically infarcted pig models. Materials and methods: Seven pigs underwent ligation of the distal left anterior descending artery. Imaging was performed on the day of infarction and 3 months post-infarct, with contrast infusion followed by MSCT scan acquisition at different time-points. Left ventricular ejection fractions (LVEFs) were obtained by left ventriculography (LVG) after 3 months. Infarcted locations found using MSCT were compared with those obtained using SPECT. Infarcted areas were also analysed histopathologically and compared with the findings from MSCT. Results: Chronic phase images had perfusion defects with lower CT values relative to normal myocardium (43 +/- 10 HU vs. 156 +/- 13 HU, p = 0.001) on the early images but no residual defects on delayed images. However, we found hyperenhancing regions on delayed images (244 +/- 20 HU vs. 121 +/- 25 HU, p = 0.001), and good correlation between MSCT-and LVG-derived LVEFs (60.56 +/- 7.56%). The areas identified by MSCT corresponded to the location of Tl-201 SPECT-/pathologic staining-derived regions in all models. Infarct size was in good agreement with MSCT and pathological analyses of chronic phase models. Conclusions: Necrotic myocardium in different stages after infarction could be qualitatively and quantitatively assessed using MSCT biphasic imaging, as could the status of microcirculation formation. MSCT-measured LVEFs matched well with other modalities, and hence MSCT is a useful tool in assessing post-infarct cardiac function.
- 出版日期2012-4
- 单位上海交通大学
