通过虚拟患者血液动力学速度调节分析,鼓励对EVAHEART 2 LVAD支进行常规的大动脉开放
Jasmine Martinez1, Kelsey Smegner2, Masae Tomoda2
1From the Department of Biomedical Engineering and Science, Florida Institute of Technology, Melbourne, Florida.
概括
为EVAHEART 2左心室辅助装置 (LVAD) 优化速度调制 (PSM) 可以显著增加大动脉 (AV) 流量. 较低的速度和更长,更深的PSM持续时间提高了AV开放和脉动性,改善了患者的血液动力学.
科学领域:
- 心血管工程 心血管工程
- 生物医学工程 生物医学工程
- 医疗器械 医疗器械
背景情况:
- 左心室辅助器件 (LVAD) 对于治疗晚期心力衰竭至关重要.
- 优化LVAD功能以促进本源心脏功能,如大动脉 (AV) 流动,仍然是一个关键的挑战.
- 对于EVAHEART 2 LVAD的速度调节潜力,需要进一步研究以提高血液动力学性能.
研究的目的:
- 研究速度调制 (PSM) 算法对EVAHEART 2左心室辅助装置 (LVAD) 患者的大动脉 (AV) 流动的影响.
- 设计最佳的PSM策略,鼓励AV开放和本地向前流动.
- 评估各种PSM参数对血液动力学参数的影响,例如平均动脉压 (MAP) 和心脏输出 (CO).
主要方法:
- 开发一个定制的虚拟患者血液动力学模型,模拟心脏腔室,血液循环和EVAHEART 2设备性能.
- 系统测试多个PSM波形,不同的基线速度 (1,6002,000rpm),PSM比率 (减速) 和持续时间 (37秒).
- 在不同的条件下分析AV流量,开放频率,MAP和CO,包括本源心室收缩率和目标MAP (7080 mm Hg).
主要成果:
- 与较高的速度相比,较低的基线速度 (1,6001,700rpm) 显示出更多的AV打开和流动的潜力.
- 在较长的PSM持续时间 (5+秒) 中,显著降低速度 (25%) 产生了最重要的AV流量.
- 减少患者MAP和增强本源心室收缩性与增加的AV开放频率和流量正相关.
结论:
- 这项研究是首次利用EVAHEART 2 LVAD的PSM来增强脉动性并促进AV流动.
- 优化的PSM策略,特别是较低的基线速度和扩展的,更深层次的减速,可以显著改善AV功能.
- 通过PSM提高AV开放频率可能有利于大动脉根血液动力学,并可能改善长期患者的治疗结果.
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