Isolating the Effect of Arch Architecture on Aortic Hemodynamics Late After Coarctation Repair: A Computational Study

Frontiers in Cardiovascular Medicine

article

Vahid Goodarzi Ardakani¹  Harshinee Goordoyal¹  Maria Victoria Ordonez²  Froso Sophocleous²  Stephanie Curtis²  Radwa Bedair²  Massimo Caputo²  Alberto Gambaruto¹  Giovanni Biglino² 

[1] Department of Mechanical Engineering, University of Bristol;University Hospitals Bristol and Weston, NHS Foundation Trust;Bristol Medical School, University of Bristol;National Heart and Lung Institute, Imperial College London

关键词: aortic coarctation;    aortic hemodynamics;    computational modeling;    computational fluid dynamics;    power loss;    wall shear stress;   

DOI  :  10.3389/fcvm.2022.855118

学科分类：地球科学(综合)

来源: Frontiers

【 摘 要 】

Objectives Effective management of aortic coarctation (CoA) affects long-term cardiovascular outcomes. Full appreciation of CoA hemodynamics is important. This study aimed to analyze the relationship between aortic shape and hemodynamic parameters by means of computational simulations, purposely isolating the morphological variable. Methods Computational simulations were run in three aortic models. MRI-derived aortic geometries were generated using a statistical shape modeling methodology. Starting from n = 108 patients, the mean aortic configuration was derived in patients without CoA ( n = 37, “no-CoA”), with surgically repaired CoA ( n = 58, “r-CoA”) and with unrepaired CoA ( n = 13, “CoA”). As such, the aortic models represented average configurations for each scenario. Key hemodynamic parameters (i.e., pressure drop, aortic velocity, vorticity, wall shear stress WSS, and length and number of strong flow separations in the descending aorta) were measured in the three models at three time points (peak systole, end systole, end diastole). Results Comparing no-CoA and CoA revealed substantial differences in all hemodynamic parameters. However, simulations revealed significant increases in vorticity at the site of CoA repair, higher WSS in the descending aorta and a 12% increase in power loss, in r-CoA compared to no-CoA, despite no clinically significant narrowing (CoA index >0.8) in the r-CoA model. Conclusions Small alterations in aortic morphology impact on key hemodynamic indices. This may contribute to explaining phenomena such as persistent hypertension in the absence of any clinically significant narrowing. Whilst cardiovascular events in these patients may be related to hypertension, the role of arch geometry may be a contributory factor.

【 授权许可】

CC BY