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严重的大动脉狭窄和心肌功能:超声波集成反射散射分析的诊断和预后有用性
Vitantonio Di Bello1, Davide Giorgi, Paolo Viacava
1Cardiac and Thoracic Department, University of Pisa, Italy. vdibello@med.unipi.it.
综合逆向散射 (IBS) 分析显示,严重的大动脉狭窄时心肌反射率发生变化,特别是在左心室缩功能下降时. 减少IBS变异与心肌纤维化增加相关,影响门更换后的喷射分数恢复.
科学领域:
- 心脏病学 心脏病学
- 生物医学工程 生物医学工程
- 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
背景情况:
- 严重的大动脉狭窄 (AS) 可以导致显著的心脏变化.
- 评估心肌组织特征对于理解AS进展至关重要.
- 综合逆向散射 (IBS) 分析提供了一种评估心肌反射率的新方法.
研究的目的:
- 用IBS分析评估患有严重大动脉狭窄症的患者的心肌反射模式.
- 为了将IBS发现与左心室缩功能和心肌纤维化相关联.
主要方法:
- 传统的2D多普勒心声学和IBS分析对35名AS患者和25名对照进行.
- 在隔膜和后壁采样了IBS信号.
- 患者根据左心室缩功能 (抑郁与正常) 划分为组.
- 心肌活检是在为纤维化评估而进行的大动脉置换期间获得的.
主要成果:
- 心肌回声强度在AS患者中显著更高,其缩性功能 (DSF) 与正常缩性功能 (NSF) 和对照相比较.
- 在患有DSF的AS患者中,IBS变异明显较低.
- 增加的回声强度与更高的心肌原蛋白含量 (纤维化) 相相关.
结论:
- 严重的AS和左心室压力过载导致心肌回声强度增加和纤维化.
- 大动脉置换可以减少左心室质量.
- 手术后喷射分数和IBS变异的改善与减少间歇性纤维化有关.
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