左心室辅助装置 阻塞 降低原生心脏效率
Ricardo Montes1, Saniya Salim Ueckert1, Vi Vu1
1Bioengineering Program, San Diego State University, San Diego, CA 92182, USA.
Bioengineering (Basel, Switzerland)
|December 23, 2023
概括
左心室辅助器件 (LVAD) 流入通路的逐渐阻塞显著降低了心脏功能,增加了血栓栓塞的风险. 早期发现这些障碍对于及时干预和改善患者结果至关重要.
科学领域:
- 生物医学工程 生物医学工程
- 心血管生理学心血管生理学
- 医疗器械研究 医疗器械研究
背景情况:
- 左心室辅助器件 (LVAD) 对于末期心力衰竭治疗至关重要.
- 由血栓或组织过度生长引起的LVAD流通路径的阻塞可以导致严重的并发症,如栓塞和中风.
- 了解LVAD阻塞的血液动力学影响对于患者管理至关重要.
研究的目的:
- 量化逐渐入流阻碍对LVAD支持的心脏压力和流动动力学的影响.
- 调查阻塞对本源心脏功能和心室内流动模式的影响.
- 为了确定早期检测LVAD阻塞的潜在指标.
主要方法:
- 在受控条件下利用模拟循环循环来模拟LVAD功能.
- 通过逐渐封闭LVAD输入区域,引入渐进式阻塞 (PO).
- 在不同的LVAD速度和PO水平上测量压力,流量和左心室 (LV) 中平面速度场.
主要成果:
- 增加阻塞导致LVAD系统内的压力和流量下降.
- 流量的很大一部分被转移到大动脉,使总流量减少了6-11%.
- 原生心脏效率降低了高达60%,腹筋LVAD流量受限,额头流量减少,心室内渦减弱.
结论:
- LVAD阻塞改变了心室内流动结构,促进了流动静止和剪切应力增加,从而增加了血栓栓塞的风险.
- 观察到的流动动力学变化和心脏效率降低凸显了LVAD阻塞的临床意义.
- 分析对外部工作的贡献可能为早期检测提供一种方法,使治疗干预能够防止设备故障和并发症.
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