Raw data of the simulation results from The effect of stent graft curvature on the hemodynamic displacement force after abdominal aortic aneurysm endovascular repair

Endovascular aortic aneurysm repair (EVAR) is a minimally invasive procedure with low mortality and morbidity. Clinical studies have revealed that a displacement force (DF) can cause stent graft (SG) migration in some circumstances requiring repeated intervention. This study aims to determine the relationship between the SG curvature and the calculated DF from four patient-specific computational fluid dynamics models. The SG's curvature was defined according to the centrelines of the implanted SG's branches. The centrelines were defined as either intersecting or separated lines. The centreline curvature (CLC) metrics were calculated based on the local curvature radii and the distances from the centrelines of idealized straight branches. The average CLC value and average variation were calculated to represent the entire graft's curvature. These CLC calculations were compared, and the method that gave the best correlation to the calculated DF was found. The optimal correlation is obtained from calculating the CLC average variation using separated centrelines and distance from straight lines, with an <i>R</i>²= 0.89. Understanding the relationship between vascular morphology and DF can help identify at-risk patients before the procedure. In these cases, we can provide appropriate treatment and follow up with the patient to prevent future failure.

腔内主动脉瘤修复术（Endovascular aortic aneurysm repair, EVAR）是一种兼具低死亡率与低并发症发生率的微创手术。临床研究证实，移位力（displacement force, DF）可在部分场景下引发覆膜支架（stent graft, SG）移位，此时往往需要采取重复干预手段。本研究旨在明确覆膜支架曲率与基于4例患者特异性计算流体动力学模型计算得到的移位力之间的关联。本研究以植入式覆膜支架分支的中心线作为依据定义支架曲率，中心线被划分为相交型与分离型两类。中心线曲率（centreline curvature, CLC）指标基于局部曲率半径以及与理想化直分支中心线的间距进行计算。本研究通过计算平均中心线曲率值及其平均变异度，以表征整个覆膜支架的整体弯曲特性。随后对各类中心线曲率计算方法展开对比，筛选出与移位力计算结果相关性最优的方法。当采用分离型中心线结合其与直分支的间距计算中心线曲率平均变异度时，可获得最佳相关性，其决定系数（R²）为0.89。明确血管形态与移位力之间的关联，有助于术前识别高风险患者，进而为其制定个体化治疗方案并做好术后随访，以预防远期治疗失败。