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 R2 = 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）是一种微创手术，具有较低的死亡率与并发症发生率。临床研究显示，移位力（displacement force, DF）在部分特定场景下可引发覆膜支架（stent graft, SG）移位，进而需要开展再次干预。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。本研究依据植入式覆膜支架分支的中心线定义支架曲率，将中心线划分为相交与分离两种类型。基于局部曲率半径以及与理想化直分支中心线的距离，计算中心线曲率（centreline curvature, CLC）指标，并通过平均中心线曲率值与平均变异度表征整个移植物的曲率特征。对各类CLC计算方法进行对比分析，最终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距离计算中心线曲率平均变异度时，可获得最优相关性，其决定系数R²为0.89。明确血管形态与移位力之间的关联，有助于术前识别高危患者，进而为其制定适宜的治疗方案并开展术后随访，以预防后续治疗失败。