粘性能量消散和脉冲之间的关系,用于由左心室辅助装置驱动的大动脉血动力学
Akshita Sahni1, Erin E McIntyre2, Kelly Cao1
1Department of Mechanical Engineering, University of Colorado Boulder, Boulder, USA.
Cardiovascular engineering and technology
|June 20, 2023
概括
左心室辅助装置 (LVAD) 的并发症与大动脉血液动力学有关. 我们的研究表明,流动频率,脉冲和手术角度显著影响能量消耗,影响患者的结果.
科学领域:
- 心血管工程 心血管工程
- 生物医学流体动力学
- 医疗器械血液动力学 医疗器械血液动力学
背景情况:
- 左心室辅助器件 (LVAD) 对晚期心力衰竭至关重要,但与中风和出血等严重并发症有关.
- 这些并发症通常与LVAD外流移植喷气引起的大动脉血动力学变化有关.
- 了解这些血液动力学变化对于改善LVAD治疗的安全性和有效性至关重要.
研究的目的:
- 系统地分析LVAD驱动的血液动力学,重点关注粘性能量传输和消散.
- 在LVAD操作期间确定影响大动脉能量消耗的关键参数.
- 为了研究不同大动脉区域的患者特异性血液动力学变化.
主要方法:
- 进行了计算流体动力学 (CFD) 模拟.
- 分析包括理想的圆柱形管 (常见的动脉和主动脉直径) 和一个具有27个LVAD配置的患者特定模型.
- 专注于粘性能量传输和消散,检查频率,脉冲,墙壁弹性和外科解剖角度等参数.
主要成果:
- 能量消散在很大程度上受频率,脉冲和外科解剖角度的影响,墙壁弹性的影响较小.
- 在患者特定的模型中,与基线流量相比,大动脉门中的能量消耗较高,腹部大动脉中的能量消耗较低.
- LVAD外流喷气的碰撞严重影响大动脉血动力学和能量消耗模式.
结论:
- 由LVAD引起的血液动力学变化,特别是外流喷气冲击,在大动脉内的能量消耗中起着关键作用.
- 频率,脉冲和手术角度是影响能量消耗的主要因素,为减轻并发症提供了目标.
- 优化LVAD外流移植位置和设备参数可能会减少有害的血液动力学影响并提高患者的安全.
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