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用心肌对照回声心脏成像检测静止的冠状动脉狭窄症.

Kevin Wei1, Khim Leng Tong, Todd Belcik

  • 1Cardiovascular Imaging Center, Cardiovascular Division, Department of Medicine, University of Virginia, Charlottesville, VA, USA. weik@OHSU.edu

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概括

心肌对照回声学可以通过测量阻塞处的动脉动脉血量 (aBV) 变化来检测静止时的冠状动脉狭窄. 这种方法提供了一个非压力方法来诊断冠状动脉疾病的严重程度.

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科学领域:

  • 心血管成像 - 心血管成像
  • 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
  • 冠状动脉疾病是一种冠状动脉疾病.

背景情况:

  • 假设动脉动脉血量 (aBV) 偏离冠状动脉狭窄的自我调节变化是可测量的.
  • 目前的方法通常需要压力来检测冠状动脉狭窄.

研究的目的:

  • 评估心肌对照回声学 (MCE) 用于检测静止时的冠状动脉狭窄.
  • 评估aBV偏向狭窄的变化是否可以进行非侵入性测量.

主要方法:

  • 15 Hz的高机械指数MCE用于不同程度的冠状动脉狭窄症患者.
  • 用Definity或Imagent对比剂测量了心内血管aBV的相变.使用Definity或Imagent对比剂测量了BV的相变.
  • 计算了心筋/腹筋aBV信号比率,并与狭窄症的严重程度相关联.

主要成果:

  • 在距离冠状动脉狭窄症远处观察到aBV的显著增加.
  • 静态/透气aBV比>0.34显示了80%的灵敏度和71%的特异性>75%的狭窄 (定义).
  • 一个比率>0.43显示了89%的灵敏度和74%的特异性>75%的狭窄 (Imagent).

结论:

  • 冠状动脉狭窄的存在和严重程度可以在休息时使用MCE检测到.
  • 通过MCE测量增加的aBV远距离狭窄,提供了一个非压力诊断工具.
  • 这种技术可以在不需要压力协议的情况下检测冠状动脉狭窄.