丰田功率损失年龄相关变化的生物机械分析
A Sahni1, L Marshall1, M A Cetatoiu1
1Department of Cardiac Surgery, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA, 02115, USA.
Annals of biomedical engineering
|May 16, 2024
概括
这项研究表明,和粘性消散率与Fontan循环中的功率损失相关,为与年龄相关的血液动力学变化提供了洞察力. 这些发现可以帮助评估Fontan通道的寿命,并改善管道设计.
科学领域:
- 心血管生理学心血管生理学
- 生物医学工程 生物医学工程
- 儿童心脏病学 儿童心脏病学
背景情况:
- 对单心室患者来说,Fontan循环的血液动力学至关重要,因为它依赖于高效的流量和能量.
- 丰坦手术能量中的与年龄相关的变化,特别是对心脏外导管 (ECC) 和侧面道 (LT) 的变化,尚未完全理解.
- 旋转率 (VOR) 和粘性消散率 (VDR) 是分析Fontan路径内的流动动力学和能量损失的关键指标.
研究的目的:
- 在Fontan患者中调查功率损失 (PL) 和时空流量描述符 (旋转和VDR) 之间的相关性.
- 为了分析年龄取决于马匹流入的变化如何影响Fontan的能量.
- 为了在不同年龄组之间比较心外导管和侧道Fontan程序之间的血液动力学性能.
主要方法:
- 利用了414名Fontan患者的数据,确定了上腔静脉 (SVC) 与下腔静脉 (IVC) 流量比率和年龄之间的关系.
- 在ECC (n=16) 和LT (n=25) 喷泉路径上进行了计算流量建模,其 caval 流入比为2,1和0.5,对应于年龄为3,8和15+.
- 在ECC和LT队列中,与旋转和粘性消散率相关的功率损失.
主要成果:
- 在ECC和LT Fontan手术中,和VDR都与所有年龄组的功率损失有很强的相关性.
- 与侧面道队列相比,心脏外导管队列显示出功率损失和/VDR之间的相关性略强.
- 绝对和索引功率损失与年龄相关的变化增加非线性,表现出显著的患者特异性变化.
- 在经过检查的入流比率中,在ECC和LT队列之间没有观察到索引功率损失的统计学上显著差异.
- 在ECC和LT患者中,随着年龄的增加和IVC流量增加,在全腔肺连接 (TCPC) 中压力梯度的持续上升被观察到.
结论:
- 骑兵流入的年龄相关变化会对Fontan的能量产生重大影响,影响功率损失和压力梯度.
- 旋转和粘性消散率是评估Fontan循环能量和长期血液动力学性能的有价值指标.
- 这些发现为评估Fontan循环的可持续性提供了一个框架,并可以为设计更高效的Fontan管道提供信息.
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