面向左心室辅助装置患者二尖瓣与主动脉瓣修复的血流动力学影响建模
Towards Modeling the Hemodynamic Impact of Mitral and Aortic Valve Repair in Patients with Left Ventricular Assist Devices
- University of Michigan（密歇根大学）
- Bundesanstalt für Materialforschung und -prüfung (BAM)（联邦材料研究与测试研究所）
- The Alan Turing Institute（艾伦·图灵研究所）
- Mayo Clinic（梅奥诊所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用患者特异性计算模型模拟LVAD患者二尖瓣和主动脉瓣修复，发现修复可改善心输出量、减轻肺淤血并降低血栓风险。
AI中文摘要：
瓣膜功能障碍是左心室辅助装置（LVAD）治疗长期成功的主要威胁，对右心功能有直接影响。在本研究中，我们应用一个基于图像的患者特异性计算建模框架，评估在五名LVAD支持患者中模拟二尖瓣和主动脉瓣修复的血流动力学影响。每位患者在四种条件下建模：（患者特异性LVAD支持状态）、模拟二尖瓣（MV）修复、模拟主动脉瓣（AV）修复以及模拟MV和AV联合修复。由于瓣膜修复的验证数据不可用，模拟修复场景是基于临床验证的患者特异性模型的探索性计算机模拟干预。模型将动态CT成像、超声心动图、导管插入术数据和设备特异性LVAD参数整合到耦合的3D-0D模拟流程中。瓣膜动力学由跨瓣压和流量控制，允许对反流病变和手术修复进行生理学建模。右心室（RV）使用模型衍生指标的组合进行评估，包括右心室射血分数（RVEF）、肺动脉搏动指数（PAPi）和RV-PA耦合。此外，我们进行了血液停留时间（RT）分析，以评估左心和主动脉内的血液淤滞。模拟结果表明，瓣膜修复改善了心输出量，减轻了肺淤血，并增强了右心室负荷条件。值得注意的是，二尖瓣修复恢复了心脏周期中的主动脉瓣开放，这改善了窦冲洗并减少了主动脉根部的血液停留时间——这些因素与较低的血栓风险相关。总体而言，这些发现表明瓣膜修复在LVAD支持心脏中具有潜在作用，但需要更大规模、经过验证的患者队列来确认这些结果。
英文摘要：
Valve dysfunction is a major threat to long-term success in left ventricle assist device (LVAD) therapy, with direct implications for right heart performance. In this study, we apply a patient-specific, image-based computational modeling framework to evaluate the hemodynamic impact of simulated mitral and aortic valve repair in five LVAD-supported patients. Each patient was modeled under four conditions: (patient-specific LVAD-supported state), simulated mitral valve (MV) repair, simulated aortic valve (AV) repair, and simulated combined MV&AV repair. Because validation data for valve repair were unavailable, the simulated repair scenarios are exploratory in silico interventions based on clinically validated patient-specific models. The models integrate dynamic CT imaging, echocardiography, catheterization data, and device-specific LVAD parameters into a coupled 3D-0D simulation pipeline. Valve dynamics are governed by transvalvular pressure and flow, allowing physiological modeling of regurgitant lesions and surgical repair. The right ventricular (RV) was assessed using a combination of model-derived metrics, including right ventricular ejection fraction (RVEF), pulmonary artery pulsatility index (PAPi), and RV-PA coupling. In addition, we performed blood residence time (RT) analysis to evaluate blood stasis within the left heart and aorta. The simulations suggest that valve repair improved cardiac output, reduced pulmonary congestion, and enhanced right ventricular loading conditions. Notably, mitral valve repair restored aortic valve opening during the cardiac cycle, which improved sinus washout and reduced blood residence time within the aortic root-factors associated with lower thrombotic risk. Overall, these findings suggest a potential role for valve repair in LVAD-supported hearts, though larger, validated patient cohorts are needed to confirm these results.
