首页> 外文期刊>Circulation journal >Evaluation of fatty acid beta-oxidation in patients with prior myocardial infarction in relation to myocardial blood flow, total oxidative metabolism, and left ventricular wall motion.
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Evaluation of fatty acid beta-oxidation in patients with prior myocardial infarction in relation to myocardial blood flow, total oxidative metabolism, and left ventricular wall motion.

机译:评估与心肌血流量,总氧化代谢和左心室壁运动有关的先前心肌梗死患者的脂肪酸β-氧化。

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BACKGROUND: Fatty acid metabolism in patients with myocardial infarction (MI) who undergo coronary reperfusion has not been fully elucidated and was investigated in the present study using positron emission tomography. METHODS AND RESULTS: The clearance rate constant of 11C-acetate (acetate-Kmono) and that of 11C-palmitate (palmitate-Kmono) from the myocardium were calculated using a monoexponential equation in 14 patients with MI. A total of 155 regions of interest were classified based on coefficient of determination (R2) values of monoexponential curves for 11C-palmitate clearance: well fitted regions (R2>or=0.5) and poorly fitted regions (R2<0.5). Regional relative myocardial blood flow calculated from the initial distribution of 11C-acetate and left ventricular (LV) wall motion were also evaluated. Peak 11C-palmitate uptake (14,434+/-3,052 vs 12,016+/-3,088 counts/s, p<0.001) and percent clearance during acquisition (38.2+/-10.1 vs 23.6+/-11.4%, p<0.001) were significantly greater in the well fitted regions (n=111) than in the poorly fitted regions (n=44). Acetate-Kmono was significantly higher in the former than in the latter (0.0641+/-0.0099 vs 0.0476+/-0.0103 min-1, p<0.001). LV wall motion and regional relative blood flow were also significantly greater in the former regions. Palmitate-Kmono in the well fitted regions was significantly higher in normal LV wall motion areas than in hypokinesis areas (0.0363+/-0.0062 vs 0.0274+/-0.0057 min-1, p<0.001) CONCLUSIONS: Maintenance of myocardial fatty acid beta-oxidation with better myocardial blood flow is substantial in the preservation of total myocardial oxidative metabolism and LV wall motion in patients with MI. The finding that the early-phase clearance of 11C-palmitate is fitted with a monoexponential curve may provide important information in the evaluation of myocardial fatty acid beta-oxidation.
机译:背景:尚不完全清楚进行冠状动脉再灌注的心肌梗死(MI)患者的脂肪酸代谢,本研究使用正电子发射断层扫描技术对其进行了研究。方法和结果:采用单指数方程计算了14例MI患者心肌中11C-乙酸盐(乙酸盐-Kmono)和11C-棕榈酸(棕榈酸-Kmono)的清除率常数。基于11C-棕榈酸酯清除率的单指数曲线的确定系数(R2)值,总共对155个感兴趣区域进行了分类:拟合良好的区域(R2> = 0.5)和拟合不良的区域(R2 <0.5)。还评估了由11C-乙酸盐的初始分布和左心室(LV)壁运动计算出的局部心肌相对血流量。峰值11C-棕榈酸酯摄取量(14,434 +/- 3,052 vs.12,016 +/- 3,088 counts / s,p <0.001)和采集过程中的清除百分比(38.2 +/- 10.1 vs 23.6 +/- 11.4%,p <0.001)显着拟合良好的区域(n = 111)比拟合不良的区域(n = 44)大。前者的乙酸-Kmono显着高于后者(0.0641 +/- 0.0099对0.0476 +/- 0.0103 min-1,p <0.001)。左室壁运动和局部相对血流在前者区域也显着增加。在正常左室壁运动区域,合适区域的棕榈酸酯-Kmono显着高于运动不足区域(0.0363 +/- 0.0062 vs 0.0274 +/- 0.0057 min-1,p <0.001)结论:维持心肌脂肪酸β-心肌梗死患者心肌总血氧氧化代谢和左室壁运动的保持具有重要意义。 11C-棕榈酸酯的早期清除率符合单指数曲线的发现可能为评估心肌脂肪酸β-氧化提供重要信息。

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