부산대학교 도서관

Abstract. The aim of this study was to evaluate the relationship between flow/metabolism, histology and functional follow-up in a sheep model of subacute myocardial infarction. In eight juvenile sheep, a myocardial infarction was induced by intracoronary injection of macrobeads. Left ventricular function was evaluated using echocardiography. 2-[[sup 18]F]fluoro-2-deoxy-D-glucose ([sup 18] F-FDG)/nitrogen-13-1abelled ammonia ([sup 13]NH[sub 3]) positron emission tomography (PET) was performed at 6 weeks and 16 weeks after embolization. In five sheep, a dynamic carbon-11 acetate study was performed. In each animal, two regions of interest were defined on the polar map, corresponding to the embolized and the non-embolized region. After the final measurements, the hearts were processed for histological evaluation. PET revealed a moderately decreased flow and oxidative metabolism in the embolized region at 6 weeks, without significant changes at follow-up. At 6 weeks, [sup 18]F-FDG uptake in the embolized area was more severely decreased as compared to the flow index in the embolized area (P<0.05). At 16 weeks, [sup 18]F-FDG metabolism had significantly recovered (P<0.05). Serial echocardiography showed a persistent decrease in global and regional left ventricular function. Histology revealed a mix of micro-infarcted and viable tissue in the embolized region. In this model of subacute myocardial infarction, a PET "reversed mismatch" pattern was observed, with partial... [ABSTRACT FROM AUTHOR]