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Zamirpour S, Gulati A, Xuan Y, Leach JR, Saloner DA, Guccione JM, Boskovski MT, Ge L, Tseng EE. Temporal evolution of ascending aortic aneurysm wall stress predicts all-cause mortality. INTERDISCIPLINARY CARDIOVASCULAR AND THORACIC SURGERY 2024; 39:ivae116. [PMID: 38913870 PMCID: PMC11229433 DOI: 10.1093/icvts/ivae116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 05/29/2024] [Accepted: 06/18/2024] [Indexed: 06/26/2024]
Abstract
OBJECTIVES Diameter-based risk stratification for elective repair of ascending aortic aneurysm fails to prevent type A dissection in many patients. Aneurysm wall stresses may contribute to risk prediction; however, rates of wall stress change over time are poorly understood. Our objective was to examine aneurysm wall stress changes over 3-5 years and subsequent all-cause mortality. METHODS Male veterans with <5.5 cm ascending aortic aneurysms and computed tomography at baseline and 3- to 5-year follow-up underwent three-dimensional aneurysm model construction. Peak circumferential and longitudinal wall stresses at systole were calculated using finite element analysis. Temporal trends were assessed by mixed-effects modelling. Changes in aortic wall stresses, diameter and length over time were evaluated as predictors of subsequent 3-year all-cause mortality by Cox proportional hazards modelling. RESULTS Sixty-two male veterans were included in the study. Yearly changes in geometric and biomechanical measures were 0.12 mm/year (95% confidence interval, 0.04-0.20) for aortic diameter, 0.41 mm/year (0.12-0.71) for aortic length, 1.19 kPa/year -5.94 to 8.33) for peak circumferential stress, and 0.48 kPa/year (-3.89 to 4.84) for peak longitudinal stress. Yearly change in peak circumferential stress was significantly associated with hazard of death-hazard ratio for peak circumferential stress growth per 10 kPa/year, 1.27 (95% CI, 1.02-1.60; P = 0.037); hazard ratio for peak circumferential stress growth ≥ 32 kPa/year, 8.47 (95% CI, 2.42-30; P < 0.001). CONCLUSIONS In this population of nonsurgical aneurysm patients, large temporal changes in peak circumferential stress, but not aortic diameter or length, was associated with all-cause mortality. Biomechanical stress and stress changes over time may be beneficial as additional risk factors for elective surgery in small aneurysms.
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Affiliation(s)
- Siavash Zamirpour
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Arushi Gulati
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Yue Xuan
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Joseph R Leach
- Department of Radiology, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - David A Saloner
- Department of Radiology, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Julius M Guccione
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Marko T Boskovski
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Liang Ge
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
| | - Elaine E Tseng
- Department of Surgery, University of California San Francisco and San Francisco VA Healthcare System, San Francisco, CA, USA
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Zamirpour S, Xuan Y, Wang Z, Gomez A, Leach JR, Mitsouras D, Saloner DA, Guccione JM, Ge L, Tseng EE. Height and body surface area versus wall stress for stratification of mid-term outcomes in ascending aortic aneurysm. IJC HEART & VASCULATURE 2024; 51:101375. [PMID: 38435381 PMCID: PMC10909604 DOI: 10.1016/j.ijcha.2024.101375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/13/2024] [Accepted: 02/23/2024] [Indexed: 03/05/2024]
Abstract
Objectives Current diameter-based guidelines for ascending thoracic aortic aneurysms (aTAA) do not consistently predict risk of dissection/rupture. ATAA wall stresses may enhance risk stratification independent of diameter. The relation of wall stresses and diameter indexed to height and body surface area (BSA) is unknown. Our objective was to compare aTAA wall stresses with indexed diameters in relation to all-cause mortality at 3.75 years follow-up. Methods Finite element analyses were performed in a veteran population with aortas ≥ 4.0 cm. Three-dimensional geometries were reconstructed from computed tomography with models accounting for pre-stress geometries. A fiber-embedded hyperelastic material model was applied to obtain wall stress distributions under systolic pressure. Peak wall stresses were compared across guideline thresholds for diameter/BSA and diameter/height. Hazard ratios for all-cause mortality and surgical aneurysm repair were estimated using cause-specific Cox proportional hazards models. Results Of 253 veterans, 54 (21 %) had aneurysm repair at 3.75 years. Indexed diameter alone would have prompted repair at baseline in 17/253 (6.7 %) patients, including only 4/230 (1.7 %) with diameter < 5.5 cm. Peak wall stresses did not significantly differ across guideline thresholds for diameter/BSA (circumferential: p = 0.15; longitudinal: p = 0.18), but did differ for diameter/height (circumferential: p = 0.003; longitudinal: p = 0.048). All-cause mortality was independently associated with peak longitudinal stresses (p = 0.04). Peak longitudinal stresses were best predicted by diameter (c-statistic = 0.66), followed by diameter/height (c-statistic = 0.59), and diameter/BSA (c-statistic = 0.55). Conclusions Diameter/height improved stratification of peak wall stresses compared to diameter/BSA. Peak longitudinal stresses predicted all-cause mortality independent of age and indexed diameter and may aid risk stratification for aTAA adverse events.
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Affiliation(s)
- Siavash Zamirpour
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
- School of Medicine, University of California, San Francisco, USA
| | - Yue Xuan
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Zhongjie Wang
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Axel Gomez
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Joseph R. Leach
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Dimitrios Mitsouras
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - David A. Saloner
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Julius M. Guccione
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Liang Ge
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
| | - Elaine E. Tseng
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, USA
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Manopoulos C, Seferlis K, Raptis A, Kouerinis I, Mathioulakis D. Mechanics of ascending aortic aneurysms based on a modulus of elasticity dependent on aneurysm diameter and pressure. Comput Methods Biomech Biomed Engin 2023:1-16. [PMID: 38008970 DOI: 10.1080/10255842.2023.2285722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 11/15/2023] [Indexed: 11/28/2023]
Abstract
The mechanical stresses and strains are examined, in ascending thoracic aortic aneurysm (aTAA) models, in a patient-specific aTAA as well as in healthy thoracic aortic models, via Finite Element Analysis. The aneurysms are assumed spherical, 1.5 mm thick, with diameters between 47 mm and 80 mm, eccentrically positioned. The geometry and wall thickness distribution of the aorta along its length are based on open literature data for an average patient age of 66.25 years, accounting for the Body Surface Area (BSA) parameter. The vessel wall material is assumed isotropic and incompressible, with its Young's modulus varying with the aneurysm diameter and the applied intraluminal pressure (120 mmHg to 240 mmHg). In the aTAAs, peak stresses were found to increase nonlinearly with aneurysm diameter (for a given pressure) tending to reach a plateau, appearing at the proximal area of the aneurysm, whereas lower stresses were found at its distal part and even smaller at the aneurysm maximum diameter. Regarding the patient-specific aTAA model, the peak stresses appeared at the distal part of the aneurysm where a tear of the intima layer was detected during surgical intervention. Peak strains exhibited for each pressure a maximum at a certain aneurysm diameter beyond which they dropped so that essentially the vessel wall's distensibility was thus reduced. Examining more than 100 geometry cases and employing a failure stress criterion, the rupture diameter thresholds were estimated to be 65, 52.5, 50 and 47.5 mm for a pressure of 120, 160, 200 and 240 mmHg respectively.
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Affiliation(s)
- Christos Manopoulos
- Laboratory of Biofluid Mechanics and Biomedical Technology, School of Mechanical Engineering, National Technical University of Athens, Athens, Greece
| | - Konstantinos Seferlis
- Laboratory of Biofluid Mechanics and Biomedical Technology, School of Mechanical Engineering, National Technical University of Athens, Athens, Greece
| | - Anastasios Raptis
- Laboratory of Biofluid Mechanics and Biomedical Technology, School of Mechanical Engineering, National Technical University of Athens, Athens, Greece
| | - Ilias Kouerinis
- 1st Department of Cardiothoracic Surgery, 'Hippocration' Hospital; National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Dimitrios Mathioulakis
- Laboratory of Biofluid Mechanics and Biomedical Technology, School of Mechanical Engineering, National Technical University of Athens, Athens, Greece
- School of Engineering, Bahrain Polytechnic, Isa Town, Kingdom of Bahrain
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Debeij GP, Parikh S, Delhaas T, Bidar E, Reesink KD. Evidence in Clinical Studies for the Role of Wall Thickness in Ascending Thoracic Aortic Aneurysms: A Scoping Review. Bioengineering (Basel) 2023; 10:882. [PMID: 37627767 PMCID: PMC10451294 DOI: 10.3390/bioengineering10080882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/17/2023] [Accepted: 07/20/2023] [Indexed: 08/27/2023] Open
Abstract
BACKGROUND Ascending thoracic aortic aneurysm is a chronic degenerative pathology characterized by dilatation of this segment of the aorta. Clinical guidelines use aortic diameter and growth rate as predictors of rupture and dissection. However, these guidelines neglect the effects of tissue remodeling, which may affect wall thickness. The present study aims to systematically review observational studies to examine to what extent wall thickness is considered and measured in clinical practice. METHODS Using PubMed and Web of Science, studies were identified with data on ascending aortic wall thickness, morphology, aortic diameter, and measurement techniques. RESULTS 15 included studies report several methods by which wall thickness is measured. No association was observed between wall thickness and aortic diameter across included studies. Wall thickness values appear not materially different between aneurysmatic aortas and non-aneurysmal aortas. CONCLUSIONS The effects on and consequences of wall thickness changes during ATAA formation are ill-defined. Wall thickness values for aneurysmatic aortas can be similar to aortas with normal diameters. Given the existing notion that wall thickness is a determinant of mechanical stress homeostasis, our review exposes a clear need for consistent as well as clinically applicable methods and studies to quantify wall thickness in ascending aortic aneurysm research.
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Affiliation(s)
- Gijs P. Debeij
- Department of Cardiothoracic Surgery, Heart & Vascular Centre, Maastricht University Medical Centre, 6229 HX Maastricht, The Netherlands
| | - Shaiv Parikh
- Department of Biomedical Engineering, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Tammo Delhaas
- Department of Biomedical Engineering, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Elham Bidar
- Department of Cardiothoracic Surgery, Heart & Vascular Centre, Maastricht University Medical Centre, 6229 HX Maastricht, The Netherlands
| | - Koen D. Reesink
- Department of Biomedical Engineering, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER Maastricht, The Netherlands
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Xiao M, Wu J, Chen D, Wang C, Wu Y, Sun T, Chen J. Ascending Aortic Volume: A Feasible Indicator for Ascending Aortic Aneurysm Elective Surgery? Acta Biomater 2023:S1742-7061(23)00353-7. [PMID: 37356784 DOI: 10.1016/j.actbio.2023.06.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 06/27/2023]
Abstract
Diameter-based criterion have been widely adopted for preventive surgery of ascending thoracic aortic aneurysm (ATAA). However, recent and growing evidence has shown that diameter-based methods may not be sufficient for identifying patients who are at risk of an ATAA. In this study, fluid-structure interaction (FSI) analysis was performed on one-hundred ATAA geometries reconstructed from clinical data to examine the relationship between hemodynamic conditions, ascending aortic volume (AAV), ascending aortic curvature, and aortic ratios measured from the reconstructed 3D models. The simulated hemodynamic and biomechanical parameters were compared among different groups of ATAA geometries classified based on AAV. The ATAAs with enlarged AAV showed significantly compromised hemodynamic conditions and higher mechanical wall stress. The maximum oscillatory shear index (OSI), particle residence time (PRT) and wall stress (WS) were significantly higher in enlarged ATAAs compared with controls (0.498 [0.497, 0.499] vs 0.499 [0.498, 0.499], p = 0.002, 312.847 [207.445, 519.391] vs 996.047 [640.644, 1573.140], p < 0.001, 769.680 [668.745, 879.795] vs 1072.000 [873.060, 1280.000] kPa, p < 0.001, respectively). Values were reported as median with interquartile range (IQR). AAV was also found to be more strongly correlated with these parameters compared to maximum diameter. The correlation coefficient between AAV and average WS was as high as 0.92 (p < 0.004), suggesting that AAV might be a feasible risk identifier for ATAAs. STATEMENT OF SIGNIFICANCE: Ascending thoracic aortic aneurysm is associated with the risk of dissection or rupture, creating life-threatening conditions. Current surgical intervention guidelines are purely diameter based. Recently, many studies proposed to incorporate other morphological parameters into the current clinical guidelines to better prevent severe adverse aortic events like rupture or dissection. The purpose of this study is to gain a better understanding of the relationship between morphological parameters and hemodynamic parameters in ascending aortic aneurysms using fluid-solid-interaction analysis on patient-specific geometries. Our results suggest that ascending aortic volume may be a better indicator for surgical intervention as it shows a stronger association with pathogenic hemodynamic conditions.
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Affiliation(s)
- Meng Xiao
- Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106, Zhongshan 2nd Road, Guangzhou, China, 510000.; Department of Electrical and Computer Engineering, University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada, T6G 2R3..
| | - Jinlin Wu
- Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106, Zhongshan 2nd Road, Guangzhou, China, 510000..
| | - Duanduan Chen
- Department of Biomedical Engineering, Beijing Institute of Technology, No. 5, South Street, Zhongguancun, Beijing, China..
| | - Chenghu Wang
- Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106, Zhongshan 2nd Road, Guangzhou, China, 510000..
| | - Yanfen Wu
- Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106, Zhongshan 2nd Road, Guangzhou, China, 510000..
| | - Tucheng Sun
- Department of Cardiac Surgery, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106, Zhongshan 2nd Road, Guangzhou, China, 510000..
| | - Jie Chen
- Department of Electrical and Computer Engineering, University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada, T6G 2R3..
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6
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He X, Lu J. On strain-based rupture criterion for ascending aortic aneurysm: the role of fiber waviness. Acta Biomater 2022; 149:51-59. [PMID: 35760348 DOI: 10.1016/j.actbio.2022.06.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/29/2022] [Accepted: 06/20/2022] [Indexed: 11/01/2022]
Abstract
We propose a new approach for constructing strain-based rupture criterion for ascending thoracic aortic aneurysm. The rupture metric is formulated using an effective strain, which is a measure of net strain that the collagen bundles experience after fiber uncrimping. The effective strain is a function of the total strain and the waviness properties of the collagen fibers. In the present work, the waviness properties are obtained from fitting biaxial response data to constitutive models that explicitly consider the collagen waviness and fiber recruitment. Inflation test data from 10 ascending thoracic aortic aneurysm specimens are analyzed. For each specimen, tension-strain data at ∼2300 material points are garnered. The effective strain fields in the configuration immediately before rupture are computed. It is found that the hotspots of the effective strain match the rupture sites very well in all 10 samples. More importantly, the values of effective strain at the hotsopts are closely clustered around 0.1, in contrast to a much wider distribution of the total strain. The study underscores the importance of considering the fiber recruitment in formulating strain-based rupture metric, and suggests that ϵ¯≈0.1, where ϵ¯ is the effective strain metric defined in this work, can be considered as a criterion for assessing the imminent rupture risk of ascending aortic aneurysms.
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Affiliation(s)
- Xuehuan He
- Department of Mechanical Engineering, and Iowa Technology Institute The University of Iowa, Iowa City, IA 52242, USA
| | - Jia Lu
- Department of Mechanical Engineering, and Iowa Technology Institute The University of Iowa, Iowa City, IA 52242, USA.
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7
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Zamirpour S, Xuan Y, Wang Z, Gomez A, Hope MD, Leach J, Mitsouras D, Saloner DA, Guccione JM, Ge L, Tseng EE. Association of 3-Year All-Cause Mortality and Peak Wall Stresses of Ascending Thoracic Aortic Aneurysms in Veterans. Semin Thorac Cardiovasc Surg 2022; 35:447-456. [PMID: 35690227 DOI: 10.1053/j.semtcvs.2022.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 06/02/2022] [Indexed: 11/11/2022]
Abstract
Risk of aortic dissection in ascending thoracic aortic aneurysms is not sufficiently captured by size-based metrics. From a biomechanical perspective, dissection may be initiated when wall stress exceeds wall strength. Our objective was to assess the association between aneurysm peak wall stresses and 3-year all-cause mortality. Finite element analysis was performed in 273 veterans with chest computed tomography for surveillance of ascending thoracic aortic aneurysms. Three-dimensional geometries were reconstructed and models developed accounting for prestress geometries. A fiber-embedded hyperelastic material model was applied to obtain circumferential and longitudinal wall stresses under systolic pressure. Patients were followed up to 3 years following the scan to assess aneurysm repair and all-cause mortality. Fine-Gray subdistribution hazards were estimated for all-cause mortality based on age, aortic diameter, and peak wall stresses, treating aneurysm repair as a competing risk. When accounting for age, subdistribution hazard of mortality was not significantly increased by peak circumferential stresses (p = 0.30) but was significantly increased by peak longitudinal stresses (p = 0.008). Aortic diameter did not significantly increase subdistribution hazard of mortality in either model (circumferential model: p = 0.38; longitudinal model: p = 0.30). The effect of peak longitudinal stresses on subdistribution hazard of mortality was maximized at a binary threshold of 355kPa, which captured 34 of 212(16%) patients with diameter <5 cm, 11 of 36(31%) at 5.0-5.4 cm, and 11 of 25(44%) at ≥5.5 cm. Aneurysm peak longitudinal stresses stratified by age and diameter were associated with increased hazard of 3-year all-cause mortality in a veteran cohort. Risk prediction may be enhanced by considering peak longitudinal stresses.
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Affiliation(s)
- Siavash Zamirpour
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA; Joint Medical Program, School of Public Health, University of California, Berkeley, and School of Medicine, University of California, San Francisco, CA, USA
| | - Yue Xuan
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Zhongjie Wang
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Axel Gomez
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Michael D Hope
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Joseph Leach
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Dimitrios Mitsouras
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - David A Saloner
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Julius M Guccione
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Liang Ge
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA
| | - Elaine E Tseng
- Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, and San Francisco Veterans Affairs Health Care System, CA, USA.
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8
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He Y, Northrup H, Le H, Cheung AK, Berceli SA, Shiu YT. Medical Image-Based Computational Fluid Dynamics and Fluid-Structure Interaction Analysis in Vascular Diseases. Front Bioeng Biotechnol 2022; 10:855791. [PMID: 35573253 PMCID: PMC9091352 DOI: 10.3389/fbioe.2022.855791] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 04/08/2022] [Indexed: 01/17/2023] Open
Abstract
Hemodynamic factors, induced by pulsatile blood flow, play a crucial role in vascular health and diseases, such as the initiation and progression of atherosclerosis. Computational fluid dynamics, finite element analysis, and fluid-structure interaction simulations have been widely used to quantify detailed hemodynamic forces based on vascular images commonly obtained from computed tomography angiography, magnetic resonance imaging, ultrasound, and optical coherence tomography. In this review, we focus on methods for obtaining accurate hemodynamic factors that regulate the structure and function of vascular endothelial and smooth muscle cells. We describe the multiple steps and recent advances in a typical patient-specific simulation pipeline, including medical imaging, image processing, spatial discretization to generate computational mesh, setting up boundary conditions and solver parameters, visualization and extraction of hemodynamic factors, and statistical analysis. These steps have not been standardized and thus have unavoidable uncertainties that should be thoroughly evaluated. We also discuss the recent development of combining patient-specific models with machine-learning methods to obtain hemodynamic factors faster and cheaper than conventional methods. These critical advances widen the use of biomechanical simulation tools in the research and potential personalized care of vascular diseases.
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Affiliation(s)
- Yong He
- Division of Vascular Surgery and Endovascular Therapy, University of Florida, Gainesville, FL, United States
| | - Hannah Northrup
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, United States
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
| | - Ha Le
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
| | - Alfred K. Cheung
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, United States
| | - Scott A. Berceli
- Division of Vascular Surgery and Endovascular Therapy, University of Florida, Gainesville, FL, United States
- Vascular Surgery Section, Malcom Randall Veterans Affairs Medical Center, Gainesville, FL, United States
| | - Yan Tin Shiu
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, United States
- *Correspondence: Yan Tin Shiu,
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9
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DeCampli WM. Commentary: Don't "stress" out. Dissection can be a thing of the past. J Thorac Cardiovasc Surg 2021; 164:1377-1378. [PMID: 34247868 DOI: 10.1016/j.jtcvs.2021.06.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 11/16/2022]
Affiliation(s)
- William M DeCampli
- Department of Clinical Sciences, The University of Central Florida College of Medicine and Division of Cardiovascular Surgery, Heart Center, Arnold Palmer Hospital for Children, Orlando, Fla.
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10
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DeAnda A, Rajagopal K, Griffith BE. Commentary: Diameter and wall stress-Wrong Laplace, wrong time? J Thorac Cardiovasc Surg 2021; 164:1376-1377. [PMID: 34217538 DOI: 10.1016/j.jtcvs.2021.06.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 06/14/2021] [Accepted: 06/14/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Abe DeAnda
- Division of Cardiovascular and Thoracic Surgery, UTMB-Galveston, Galveston, Tex.
| | - Keshava Rajagopal
- Department of Clinical Sciences, University of Houston College of Medicine, Houston, Tex; Houston Heart, HCA Houston Healthcare, Houston, Tex
| | - Boyce E Griffith
- Carolina Center for Interdisciplinary Applied Mathematics, University of North Carolina, Chapel Hill, NC; Computational Medicine Program, University of North Carolina, Chapel Hill, NC; McAllister Heart Institute, University of North Carolina, Chapel Hill, NC
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