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Circulation:心肌肌钙蛋白与冠状动脉血流储备相关性研究

2014-12-15 MedSci MedSci原创

背景:血清心肌肌钙蛋白(Tn)升高反应了心肌损伤,Tn升高与冠心病死亡率升高相关,甚至没有冠心病的患者Tn升高也与死亡率升高相关。我们探索低水平升高的Tn与减少的冠状动脉血流储备(用于评估冠状动脉血管收缩功能)之间的关联,并评价它们对无明显冠心病患者不良结局的影响。 方法与结果:761例患者,在进行负荷心肌灌注正电子发射断层显像前,通过心肌肌钙蛋白对疑似冠心病进行评估,对主要心血管不良事件进

背景:血清心肌肌钙蛋白(Tn)升高反应了心肌损伤,Tn升高与冠心病死亡率升高相关,甚至没有冠心病的患者Tn升高也与死亡率升高相关。我们探索低水平升高的Tn与减少的冠状动脉血流储备(用于评估冠状动脉血管收缩功能)之间的关联,并评价它们对无明显冠心病患者不良结局的影响。

方法与结果:761例患者,在进行负荷心肌灌注正电子发射断层显像前,通过心肌肌钙蛋白对疑似冠心病进行评估,对主要心血管不良事件进行平均2.8年的随访,包括心血管性死亡,非致命性心肌梗死或晚期血管重建。流量限制型冠心病患者,左心射血分数<40%/60天内进行成像血管重建术患者被排除。静息/负荷心肌血流通过正电子发射断层显像测量冠状动脉血流储备。与Tn-)相比,97Tn+)显示更高的临床预测分数,更多的肾功能不全,以及低左心室射血分数和低冠状动脉血流储备。进行平差分析,冠状动脉血流储备减少和Tn+)独立相关(优势比2.18,95%可信区间1.37-3.47P=0.001),冠状动脉血流储备减少和Tn+)与主要心血管事件独立相关(分别是:危害比2.2595%可信区间1.31-3.86P=0.003;危害比2.42,95%可信区间1.34-4.40P=0.004)。冠状动脉血流储备减少和Tn+)主要心血管事件风险最高(log-rank P<0.0001),两者都与主要心血管事件显著相关(P<0.007)。

结论:无显著冠心病患者,冠状动脉血流储备减少与Tn升高以及主要心血管事件独立相关。冠状动脉血流储备减少显示微血管功能不全,便于改进Tn+)在不良结局中的效果。

原始出处

Taqueti VR, Everett BM, Murthy VL, et al. Interaction of Impaired Coronary Flow Reserve and Cardiomyocyte Injury on Adverse Cardiovascular Outcomes in Patients Without Overt Coronary Artery Disease. Circulation. 2014.

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