门置换后冠状动脉微循环的功能变化在患有大动脉狭窄症的患者中
Kim Rajappan1, Ornella E Rimoldi, Paolo G Camici
1Academic Cardiology Unit, St Mary's Hospital, London, UK.
Circulation
|June 11, 2003
概括
大动脉狭窄 (AS) 患者在大动脉置换 (AVR) 后显示出冠状动脉微循环的改善. 减少压缩和更好的透析输液时间 (DPT),而不仅仅是左心室质量 (LVM) 回归,推动了这些有益的变化.
科学领域:
- 心血管医学 心血管医学
- 心脏外科手术 心脏外科手术
- 医疗成像医学成像
背景情况:
- 大动脉狭窄 (AS) 中冠状动脉微循环功能障碍与血管外压缩和缩短的透气 perfusion 时间 (DPT) 有关.
- 大动脉置换 (AVR) 对这些微循环变化的影响尚未完全理解.
- 这项研究调查了AVR后的外腔输液和冠状动脉血管扩张器储备 (CVR) 的变化.
研究的目的:
- 量化AS患者在AVR后的外腔输液和CVR的变化.
- 评估左心室质量 (LVM) 回归,大动脉面积 (AVA) 变化和DPT在AVR后微循环功能中的作用.
- 确定推动AVR后冠状动脉微循环改善的主要机制.
主要方法:
- 22名AS患者在AVR发生前和1年后接受了评估.
- 使用了心声图,心血管磁共振和正子发射断层扫描.
- 测量包括AVA,LVM,静止和高血压心肌动脉血流 (MBF),以及CVR.
主要成果:
- 在AVR (129±30至94±24 g/m2) 后的所有患者中都出现了显著的LVM回归.
- 休息的MBF下降,而CVR在AVR后增加,具有显著的个体变异性.
- 增加的高血压MBF和CVR与AVA增加相关;DPT变化与CVR改善有关.
结论:
- 冠状动脉微循环的AVR后改善不仅仅取决于LVM回归.
- 减少血管外压缩和增加DPT是加强心肌动脉血流和AVR后CVR的关键机制.
- 这些发现强调了解决AS管理中的微循环因素的重要性.
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