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输液与功能对比:缺血级联需求缺血症:单血管与多血管狭窄的含义
Howard Leong-Poi1, Se-Joong Rim, D Elizabeth Le
1Cardiac Imaging Center, Cardiovascular Division, University of Virginia School of Medicine, Charlottesville, Va, USA.
Circulation
|February 28, 2002
概括
在需求性缺血中,在功能变化之前发生异常的心脏输液. 这种输液异常比功能性变化更普遍,在单血管狭窄症 (SVS) 中比多血管狭窄症 (MVS) 更明显.
科学领域:
- 心血管生理学心血管生理学
- 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
- 缺血性心脏病是一种心脏病.
背景情况:
- 需求性缺血会导致心肌 perfusion 和功能的异常.
- 了解这些异常的序列和空间范围对于诊断冠状动脉狭窄至关重要.
- 区分单血管狭窄症 (SVS) 和多血管狭窄症 (MVS) 可能会影响缺血变化的呈现.
研究的目的:
- 为了研究异常心肌输液和需求缺血期间的功能之间的时间和空间关系.
- 在单血管狭窄症 (SVS) 与多血管狭窄症 (MVS) 的背景下,比较这些关系.
- 确定 perfusion 异常是否先于功能异常及其相对空间范围.
主要方法:
- 九只狗接受了SVS或MVS安置,其狭窄程度不同.
- 用多布胺输液来诱导需求缺血.
- 在不同的多布胺剂量下评估了心肌输液 (使用心肌对比回声学) 和壁厚度 (作为功能的衡量标准).
主要成果:
- 在SVS中,在较低的多布胺剂量下检测到异常输液,而不是异常壁壁厚.
- perfusion 异常的空间范围通常大于功能异常的空间范围.
- 与SVS相比,MVS中 perfusion 和功能之间的时空失调不那么明显.
结论:
- 这些发现支持了缺血级联的概念,在功能障碍之前发生 perfusion 缺陷.
- 异常的输液是冠状动脉狭窄的更敏感的指标,而不是异常的功能.
- 由于缺血变化的不同模式,多布他胺回声心电图显示MVS检测的灵敏度比SVS更高.
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