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Stephan H, Grefen L, Clevert D, Onkes M, Ning J, Thierfelder N, Mela P, Hagl C, Curta A, Grab M. 4D-Flow MRI and Vector Ultrasound in the In-Vitro Evaluation of Surgical Aortic Heart Valves - a Pilot Study. J Cardiovasc Transl Res 2024:10.1007/s12265-024-10564-0. [PMID: 39365396 DOI: 10.1007/s12265-024-10564-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 09/12/2024] [Indexed: 10/05/2024]
Abstract
INTRODUCTION The aim of this study was the initial investigation of 4D-Flow MRI and Vector Ultrasound as novel imaging techniques in the in-vitro analysis of hemodynamics in anatomical models. Specifically, by looking at the hemodynamic performance of state-of-the-art surgical heart valves in a 3D-printed aortic arch. METHODS The mock circulatory loop simulated physiological, pulsatile flow. Two mechanical and three biological aortic valves prostheses were compared in a 3D-printed aortic arch. 4D magnetic resonance imaging and vector flow Doppler ultrasound served as imaging methods. Hemodynamic parameters such as wall shear stress, flow velocities and pressure gradients were analyzed. RESULTS The flow analysis revealed characteristic flow-patterns in the 3D-printed aortic arch. The blood-flow in the arch presented complex patterns, including the formation of helixes and vortices. Higher proximal peak velocities and lower flow volumes were found for biological valves. CONCLUSION The mock circulatory loop in combination with modern radiological imaging provides a sufficient basis for the hemodynamic comparison of aortic valves.
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Affiliation(s)
- Henrik Stephan
- Department of Cardiac Surgery, LMU Hospital - Campus Großhadern, Marchioninistraße 15, 81377, Munich, Germany
| | - Linda Grefen
- Department of Cardiac Surgery, LMU Hospital - Campus Großhadern, Marchioninistraße 15, 81377, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Dirk Clevert
- Department of Radiology, LMU University Hospital, Munich, Germany
| | - Meike Onkes
- Department of Radiology, LMU University Hospital, Munich, Germany
| | - Jin Ning
- Siemens Healthineers AG, Erlangen, Germany
| | - Nikolaus Thierfelder
- Department of Cardiac Surgery, LMU Hospital - Campus Großhadern, Marchioninistraße 15, 81377, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Petra Mela
- Chair of Medical Materials and Implants, Department of Mechanical Engineering, TUM School of Engineering, and Design, Munich Institute of Biomedical Engineering, Technical University of Munich, Munich, Germany
| | - Christian Hagl
- Department of Cardiac Surgery, LMU Hospital - Campus Großhadern, Marchioninistraße 15, 81377, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Adrian Curta
- Department of Radiology, LMU University Hospital, Munich, Germany
| | - Maximilian Grab
- Department of Cardiac Surgery, LMU Hospital - Campus Großhadern, Marchioninistraße 15, 81377, Munich, Germany.
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany.
- Chair of Medical Materials and Implants, Department of Mechanical Engineering, TUM School of Engineering, and Design, Munich Institute of Biomedical Engineering, Technical University of Munich, Munich, Germany.
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Al-Rawi M, Belkacemi D, Lim ETA, Khashram M. Investigation of Type A Aortic Dissection Using Computational Modelling. Biomedicines 2024; 12:1973. [PMID: 39335487 PMCID: PMC11428704 DOI: 10.3390/biomedicines12091973] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2024] [Revised: 08/21/2024] [Accepted: 08/28/2024] [Indexed: 09/30/2024] Open
Abstract
Aortic dissection is a catastrophic failure of the endothelial wall that could lead to malperfusion or rupture. Computational modelling tools may help detect arterial damage. Technological advancements have led to more sophisticated forms of modelling being made available to low-grade computers. These devices can create 3D models with clinical data, where the clinical blood pressure waveforms' model can be used to form boundary conditions for assessing hemodynamic parameters, modelling blood flow propagation along the aorta to predict the development of cardiovascular disease. This study presents patient-specific data for a rare case of severe Type A aortic dissection. CT scan images were taken nine months apart, consisting of the artery both before and after dissection. The results for the pre-dissection CT showed that the pressure waveform at the ascending aorta was higher, and the systolic pressure was lagging at the descending aorta. For the post-dissection analysis, we observed the same outcome; however, the amplitude for the waveform (systolic pressure) at the ascending aorta increased in the false lumen by 25% compared to the true lumen by 3%. Also, the waveform peak (systolic) was leading by 0.01 s. The hemodynamic parameter of wall shear stress (WSS) predicted the aneurysm's existence at the ascending aorta, as well as potential aortic dissection. The high WSS contours were located at the tear location at the peak blood flow of 0.14 s, which shows the potential of this tool for earlier diagnosis of aortic dissection.
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Affiliation(s)
- Mohammad Al-Rawi
- Center for Engineering and Industrial Design (CEID), Waikato Institute of Technology (Wintec), Hamilton 3240, New Zealand
- Faculty of Engineering, Chemical and Materials Engineering, University of Auckland, Auckland 1010, New Zealand
| | - Djelloul Belkacemi
- Unité de Développement des Equipements Solaires UDES, EPST Centre de Développement des Energies Renouvelables (CDER), Bousmail, Tipaza 42415, Algeria;
| | - Eric T. A. Lim
- Department of Vascular & Endovascular Surgery, Waikato Hospital, Hamilton 3204, New Zealand; (E.T.A.L.); (M.K.)
| | - Manar Khashram
- Department of Vascular & Endovascular Surgery, Waikato Hospital, Hamilton 3204, New Zealand; (E.T.A.L.); (M.K.)
- Department of Surgery, University of Auckland, Auckland 1023, New Zealand
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3
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Wira CR, Kearns T, Fleming-Nouri A, Tyrrell JD, Wira CM, Aydin A. Considering Adverse Effects of Common Antihypertensive Medications in the ED. Curr Hypertens Rep 2024; 26:355-368. [PMID: 38687403 DOI: 10.1007/s11906-024-01304-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2024] [Indexed: 05/02/2024]
Abstract
PURPOSE OF REVIEW To evaluate the adverse effects of common antihypertensive agents utilized or encountered in the Emergency Department. RECENT FINDINGS All categories of antihypertensive agents may manifest adverse effects, inclusive of adverse drug reactions (ADRs), drug-to-drug interactions, or accidental overdose. Adverse effects, and specifically ADRs, may be stratified into the organ systems affected, might require specific time-sensitive interventions, could pose particular risks to vulnerable populations, and may result in significant morbidity, and potential mortality. Adverse effects of common antihypertensive agents may be encountered in the ED, necessitating that ED systems of care are poised to prevent, recognize, and intervene when adverse effects arise.
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Affiliation(s)
- Charles R Wira
- Department of Emergency Medicine, Yale School of Medicine, 464 Congress Ave., Suite 260, New Haven, CT, 06519, USA.
- Yale Acute Stroke Program, Section of Vascular Neurology, Department of Neurology, New Haven, CT, USA.
| | - Thomas Kearns
- Department of Emergency Medicine, Yale School of Medicine, 464 Congress Ave., Suite 260, New Haven, CT, 06519, USA
| | - Alex Fleming-Nouri
- Department of Emergency Medicine, Yale School of Medicine, 464 Congress Ave., Suite 260, New Haven, CT, 06519, USA
| | - John D Tyrrell
- Department of Emergency Medicine, Yale School of Medicine, 464 Congress Ave., Suite 260, New Haven, CT, 06519, USA
- Department of Pharmacy, Yale New Haven Hospital, New Haven, CT, USA
| | | | - Ani Aydin
- Department of Emergency Medicine, Yale School of Medicine, 464 Congress Ave., Suite 260, New Haven, CT, 06519, USA
- Section of Surgical Critical Care, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
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4
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Forneris A, Hassanabad AF, Appoo JJ, Di Martino ES. Predicting Aneurysmal Degeneration in Uncomplicated Residual Type B Aortic Dissection. Bioengineering (Basel) 2024; 11:690. [PMID: 39061772 PMCID: PMC11274148 DOI: 10.3390/bioengineering11070690] [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: 03/29/2024] [Revised: 06/18/2024] [Accepted: 06/19/2024] [Indexed: 07/28/2024] Open
Abstract
The formation of an aneurysm in the false lumen (FL) is a long-term complication in a significant percentage of type B aortic dissection (AD) patients. The ability to predict which patients are likely to progress to aneurysm formation is key to justifying the risks of interventional therapy. The investigation of patient-specific hemodynamics has the potential to enable a patient-tailored approach to improve prognosis by guiding disease management for type B dissection. CFD-derived hemodynamic descriptors and geometric features were used to retrospectively assess individual aortas for a population of residual type B AD patients and analyze correlations with known outcomes (i.e., rapid aortic growth, death). The results highlight great variability in flow patterns and hemodynamic descriptors. A rapid aortic expansion was found to be associated with a larger FL. Time-averaged wall shear stress at the tear region emerged as a possible indicator of the dynamics of flow exchange between lumens and its effect on the evolution of individual aortas. High FL flow rate and tortuosity were associated with adverse outcomes suggesting a role as indicators of risk. AD induces complex changes in vessel geometry and hemodynamics. The reported findings emphasize the need for a patient-tailored approach when evaluating uncomplicated type B AD patients and show the potential of CFD-derived hemodynamics to complement anatomical assessment and help disease management.
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Affiliation(s)
- Arianna Forneris
- Department of Biomedical Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;
- R&D Department, ViTAA Medical Solutions, Montreal, QC H2K 1M6, Canada
| | - Ali F. Hassanabad
- Section of Cardiac Surgery, Department of Cardiac Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.F.H.); (J.J.A.)
| | - Jehangir J. Appoo
- Section of Cardiac Surgery, Department of Cardiac Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.F.H.); (J.J.A.)
| | - Elena S. Di Martino
- Department of Biomedical Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;
- R&D Department, ViTAA Medical Solutions, Montreal, QC H2K 1M6, Canada
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Osswald A, Tsagakis K, Demircioglu E, Weymann A, Zubarevich A, Ruhparwar A, Karmonik C. Hostile Hemodynamics in Distal Stent Graft-Induced New Entry Prior to Aortic Rupture: A Comparison of Transient versus Steady-State CFD Simulations. Thorac Cardiovasc Surg 2024; 72:134-141. [PMID: 37506731 DOI: 10.1055/s-0043-1771357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
BACKGROUND Computational fluid dynamics (CFD) simulations model blood flow in aortic pathologies. The aim of our study was to understand the local hemodynamic environment at the site of rupture in distal stent graft-induced new entry (dSINE) after frozen elephant trunk with a clinically time efficient steady-flow simulation versus transient simulations. METHODS Steady-state simulations were performed for dSINE, prior and after its development and prior to aortic rupture. To account for potential turbulences due geometric changes at the dSINE location, Reynolds-averaged Navier-Stokes equations with the realizable k-ε model for turbulences were applied. Transient simulations were performed for comparison. Hemodynamic parameters were assessed at various locations of the aorta. RESULTS Post-dSINE, jet-like flow due to luminal narrowing was observed which increased prior to rupture and resulted in focal neighbored regions of high and low wall shear stress (WSS). Prior to rupture, aortic diameter at the rupture site increased lowering WSS at the entire aortic circumference. Concurrently, WSS and turbulence increased locally above the entry tear at the inner aortic curvature. Turbulent kinetic energy and WSS elevation in the downstream aorta demonstrated enhanced stress on the native aorta. Results of steady-state simulations were in good qualitative agreement with transient simulations. CONCLUSION Steady-flow CFD simulations feasible at clinical time scales prior to aortic rupture reveal a hostile hemodynamic environment at the dSINE rupture site in agreement with lengthy transient simulations. Consequently, our developed approach may be of value in treatment planning where a fast assessment of the local hemodynamic environment is essential.
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Affiliation(s)
- Anja Osswald
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Konstantinos Tsagakis
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Ender Demircioglu
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Alexander Weymann
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Alina Zubarevich
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Arjang Ruhparwar
- Department of Thoracic and Cardiovascular Surgery, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Essen, Germany
| | - Christof Karmonik
- MRI Core, Translational Imaging Center, Houston Methodist Research Institute, Houston, Texas, United States
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Zimmermann J, Bäumler K, Loecher M, Cork TE, Marsden AL, Ennis DB, Fleischmann D. Hemodynamic effects of entry and exit tear size in aortic dissection evaluated with in vitro magnetic resonance imaging and fluid-structure interaction simulation. Sci Rep 2023; 13:22557. [PMID: 38110526 PMCID: PMC10728172 DOI: 10.1038/s41598-023-49942-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 12/13/2023] [Indexed: 12/20/2023] Open
Abstract
Understanding the complex interplay between morphologic and hemodynamic features in aortic dissection is critical for risk stratification and for the development of individualized therapy. This work evaluates the effects of entry and exit tear size on the hemodynamics in type B aortic dissection by comparing fluid-structure interaction (FSI) simulations with in vitro 4D-flow magnetic resonance imaging (MRI). A baseline patient-specific 3D-printed model and two variants with modified tear size (smaller entry tear, smaller exit tear) were embedded into a flow- and pressure-controlled setup to perform MRI as well as 12-point catheter-based pressure measurements. The same models defined the wall and fluid domains for FSI simulations, for which boundary conditions were matched with measured data. Results showed exceptionally well matched complex flow patterns between 4D-flow MRI and FSI simulations. Compared to the baseline model, false lumen flow volume decreased with either a smaller entry tear (- 17.8 and - 18.5%, for FSI simulation and 4D-flow MRI, respectively) or smaller exit tear (- 16.0 and - 17.3%). True to false lumen pressure difference (initially 11.0 and 7.9 mmHg, for FSI simulation and catheter-based pressure measurements, respectively) increased with a smaller entry tear (28.9 and 14.6 mmHg), and became negative with a smaller exit tear (- 20.6 and - 13.2 mmHg). This work establishes quantitative and qualitative effects of entry or exit tear size on hemodynamics in aortic dissection, with particularly notable impact observed on FL pressurization. FSI simulations demonstrate acceptable qualitative and quantitative agreement with flow imaging, supporting its deployment in clinical studies.
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Affiliation(s)
| | - Kathrin Bäumler
- Department of Radiology, Stanford University, Stanford, CA, USA.
| | - Michael Loecher
- Department of Radiology, Stanford University, Stanford, CA, USA
- Division of Radiology, Veterans Affairs Health Care System, Palo Alto, CA, USA
| | - Tyler E Cork
- Department of Radiology, Stanford University, Stanford, CA, USA
- Department of Bioengineering, Stanford University, Stanford, CA, USA
| | - Alison L Marsden
- Department of Bioengineering, Stanford University, Stanford, CA, USA
- Department of Pediatrics, Stanford University, Stanford, CA, USA
| | - Daniel B Ennis
- Department of Radiology, Stanford University, Stanford, CA, USA
- Division of Radiology, Veterans Affairs Health Care System, Palo Alto, CA, USA
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Jiang X, Xiang G, Du G, Li X, Wu P, Du X. A hemodynamic analysis of fenestrated physician-modified endograft repair for complicated aortic dissections involving the visceral arteries. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 242:107785. [PMID: 37678097 DOI: 10.1016/j.cmpb.2023.107785] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 08/12/2023] [Accepted: 08/29/2023] [Indexed: 09/09/2023]
Abstract
OBJECTIVE The aim of this study is to perform patient-specific hemodynamic simulations of the patients with complicated aortic dissection underwent Physician-modified endograft (PMEG) and evaluate the treatment outcome. METHOD 12 patient-specific models were reconstructed from computed tomography angiography (CTA) data of 6 patients with complicated aortic dissection before and after the PMEG. Hemodynamic simulations were conducted with the same time-varying volumetric flow rate extracted from the literature and 3-element Windkessel model (3 EWM) boundary conditions were applied at the aortic outlet. Hemodynamic indicators such as time-averaged wall shear stress (TAWSS), relative residence time (RRT) and endothelial cell activation potential (ECAP) were obtained to evaluate the postoperative effect of PMEG. RESULTS Comparing with the preoperative models, the flow rates of most visceral arteries were increased in the postoperative models (PSMA = 0.012, PRRA = 0.013, and PLRA = 0.005). Pressure and TAWSS in visceral regions were significantly reduced (PP = 0.003 and PTAWSS = 0.017). With the false lumens (FL) covered by the stent grafts, the average TAWSS level increased in the regions of postoperative abdominal aorta (P = 0.002), and the average RRT and ECAP values decreased significantly (PRRT = 0.02 and PECAP = 0.003). CONCLUSION This study shows that PMEG, as a new technique for the treatment of complicated aortic dissection involving the distal tears in the visceral region, can effectively restore the abnormal blood supply of the visceral arteries, reduce the risk of aortic rupture, the formation of aortic dissection aneurysm (ADA), and thrombosis. This corresponds well with clinical retrospective studies and 1-year follow-up outcomes. The findings of this study are of great significance for the development of PMEG.
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Affiliation(s)
- Xudong Jiang
- Department of Vascular Surgery, Nanjing Drum Tower Hospital Clinical College of Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 321 Zhongshan Road, Nanjing, Jiangsu, China; Department of Vascular Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China
| | - Guangyuan Xiang
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China
| | - Guanting Du
- Artificial Organ Technology Laboratory, School of Mechanical and Electrical Engineering, Soochow University, 8 Jixue Road, Suzhou, Jiangsu 21513, China
| | - Xiaoqiang Li
- Department of Vascular Surgery, Nanjing Drum Tower Hospital Clinical College of Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 321 Zhongshan Road, Nanjing, Jiangsu, China; Department of Vascular Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
| | - Peng Wu
- Artificial Organ Technology Laboratory, School of Mechanical and Electrical Engineering, Soochow University, 8 Jixue Road, Suzhou, Jiangsu 21513, China.
| | - Xiaolong Du
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing, Jiangsu 210008, China.
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Chen HW, Chen CH, Fan YJ, Lin CY, Hsu WH, Su IC, Lin CL, Chiang YC, Huang HM. CFD Study of the Effect of the Angle Pattern on Iliac Vein Compression Syndrome. Bioengineering (Basel) 2023; 10:688. [PMID: 37370619 DOI: 10.3390/bioengineering10060688] [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: 05/11/2023] [Revised: 05/29/2023] [Accepted: 05/31/2023] [Indexed: 06/29/2023] Open
Abstract
Iliac vein compression syndrome (IVCS, or May-Thurner syndrome) occurs due to the compression of the left common iliac vein between the lumbar spine and right common iliac artery. Because most patients with compression are asymptomatic, the syndrome is difficult to diagnose based on the degree of anatomical compression. In this study, we investigated how the tilt angle of the left common iliac vein affects the flow patterns in the compressed blood vessel using three-dimensional computational fluid dynamic (CFD) simulations to determine the flow fields generated after compression sites. A patient-specific iliac venous CFD model was created to verify the boundary conditions and hemodynamic parameter set in this study. Thirty-one patient-specific CFD models with various iliac venous angles were developed using computed tomography (CT) angiograms. The angles between the right or left common iliac vein and inferior vena cava at the confluence level of the common iliac vein were defined as α1 and α2. Flow fields and vortex locations after compression were calculated and compared according to the tilt angle of the veins. Our results showed that α2 affected the incidence of flow field disturbance. At α2 angles greater than 60 degrees, the incidence rate of blood flow disturbance was 90%. In addition, when α2 and α1 + α2 angles were used as indicators, significant differences in tilt angle were found between veins with laminar, transitional, and turbulent flow (p < 0.05). Using this mathematical simulation, we concluded that the tilt angle of the left common iliac vein can be used as an auxiliary indicator to determine IVCS and its severity, and as a reference for clinical decision making.
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Affiliation(s)
- Hsuan-Wei Chen
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei 11031, Taiwan
| | - Chao-Hsiang Chen
- Department of Imaging Medicine, Taipei Medical University Hospital, Taipei 11031, Taiwan
| | - Yu-Jui Fan
- School of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan
| | - Chun-Yu Lin
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei 114202, Taiwan
| | - Wen-Hsien Hsu
- Department of Lymphovascular Surgery, Taipei Municipal Wanfang Hospital, Taipei 11600, Taiwan
| | - I-Chang Su
- Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Department of Neurosurgery, Taipei Medical University-Shuang Ho Hospital, Ministry of Health and Welfare, New Taipei City 235041, Taiwan
| | - Chun-Li Lin
- Medical Device Innovation and Translation Center, Department of Biomedical Engineering, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan
| | - Yuan-Ching Chiang
- Department of Mechanical Engineering, Chinese Culture University, Taipei 111396, Taiwan
| | - Haw-Ming Huang
- School of Dentistry, Taipei Medical University, Taipei 11031, Taiwan
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9
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Zhu Y, Xu XY, Rosendahl U, Pepper J, Mirsadraee S. Advanced risk prediction for aortic dissection patients using imaging-based computational flow analysis. Clin Radiol 2023; 78:e155-e165. [PMID: 36610929 DOI: 10.1016/j.crad.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022]
Abstract
Patients with either a repaired or medically managed aortic dissection have varying degrees of risk of developing late complications. High-risk patients would benefit from earlier intervention to improve their long-term survival. Currently serial imaging is used for risk stratification, which is not always reliable. On the other hand, understanding aortic haemodynamics within a dissection is essential to fully evaluate the disease and predict how it may progress. In recent decades, computational fluid dynamics (CFD) has been extensively applied to simulate complex haemodynamics within aortic diseases, and more recently, four-dimensional (4D)-flow magnetic resonance imaging (MRI) techniques have been developed for in vivo haemodynamic measurement. This paper presents a comprehensive review on the application of image-based CFD simulations and 4D-flow MRI analysis for risk prediction in aortic dissection. The key steps involved in patient-specific CFD analyses are demonstrated. Finally, we propose a workflow incorporating computational modelling for personalised assessment to aid in risk stratification and treatment decision-making.
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Affiliation(s)
- Y Zhu
- Department of Chemical Engineering, Imperial College London, London, UK
| | - X Y Xu
- Department of Chemical Engineering, Imperial College London, London, UK
| | - U Rosendahl
- Department of Cardiac Surgery, Royal Brompton and Harefield Hospitals, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - J Pepper
- Department of Cardiac Surgery, Royal Brompton and Harefield Hospitals, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - S Mirsadraee
- National Heart and Lung Institute, Imperial College London, London, UK; Department of Radiology, Royal Brompton and Harefield Hospitals, London, UK.
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10
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Kim T, van Bakel PAJ, Nama N, Burris N, Patel HJ, Williams DM, Figueroa CA. A Computational Study of Dynamic Obstruction in Type B Aortic Dissection. J Biomech Eng 2023; 145:031008. [PMID: 36459144 PMCID: PMC10854260 DOI: 10.1115/1.4056355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 11/18/2022] [Accepted: 11/21/2022] [Indexed: 12/05/2022]
Abstract
A serious complication in aortic dissection is dynamic obstruction of the true lumen (TL). Dynamic obstruction results in malperfusion, a blockage of blood flow to a vital organ. Clinical data reveal that increases in central blood pressure promote dynamic obstruction. However, the mechanisms by which high pressures result in TL collapse are underexplored and poorly understood. Here, we developed a computational model to investigate biomechanical and hemodynamical factors involved in Dynamic obstruction. We hypothesize that relatively small pressure gradient between TL and false lumen (FL) are sufficient to displace the flap and induce obstruction. An idealized fluid-structure interaction model of type B aortic dissection was created. Simulations were performed under mean cardiac output while inducing dynamic changes in blood pressure by altering FL outflow resistance. As FL resistance increased, central aortic pressure increased from 95.7 to 115.3 mmHg. Concurrent with blood pressure increase, flap motion was observed, resulting in TL collapse, consistent with clinical findings. The maximum pressure gradient between TL and FL over the course of the dynamic obstruction was 4.5 mmHg, consistent with our hypothesis. Furthermore, the final stage of dynamic obstruction was very sudden in nature, occurring over a short time (<1 s) in our simulation, consistent with the clinical understanding of this dramatic event. Simulations also revealed sudden drops in flow and pressure in the TL in response to the flap motion, consistent with first stages of malperfusion. To our knowledge, this study represents the first computational analysis of potential mechanisms driving dynamic obstruction in aortic dissection.
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Affiliation(s)
- T Kim
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48105
| | - P A J van Bakel
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI 48105
| | - N Nama
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588
| | - N Burris
- Department of Radiology, University of Michigan, Ann Arbor, MI 48105
| | - H J Patel
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI 48105
| | - D M Williams
- Department of Radiology, University of Michigan, Ann Arbor, MI 48105
| | - C A Figueroa
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48105; Department of Surgery, University of Michigan, Ann Arbor, MI 48105
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11
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Moretti S, Tauro F, Orrico M, Mangialardi N, Facci AL. Comparative Analysis of Patient-Specific Aortic Dissections through Computational Fluid Dynamics Suggests Increased Likelihood of Degeneration in Partially Thrombosed False Lumen. Bioengineering (Basel) 2023; 10:bioengineering10030316. [PMID: 36978707 PMCID: PMC10045026 DOI: 10.3390/bioengineering10030316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/16/2023] [Accepted: 02/21/2023] [Indexed: 03/06/2023] Open
Abstract
Aortic dissection is a life-threatening vascular disease associated with high rates of morbidity and mortality, especially in medically underserved communities. Understanding patients’ blood flow patterns is pivotal for informing evidence-based treatment as they greatly influence the disease outcome. The present study investigates the flow patterns in the false lumen of three aorta dissections (fully perfused, partially thrombosed, and fully thrombosed) in the chronic phase, and compares them to a healthy aorta. Three-dimensional geometries of aortic true and false lumens (TLs and FLs) are reconstructed through an ad hoc developed and minimally supervised image analysis procedure. Computational fluid dynamics (CFD) is performed through a finite volume unsteady Reynolds-averaged Navier–Stokes approach assuming rigid wall aortas, Newtonian and homogeneous fluid, and incompressible flow. In addition to flow kinematics, we focus on time-averaged wall shear stress and oscillatory shear index that are recognized risk factors for aneurysmal degeneration. Our analysis shows that partially thrombosed dissection is the most prone to false lumen degeneration. In all dissections, the arteries connected to the false lumen are generally poorly perfused. Further, both true and false lumens present higher turbulence levels than the healthy aorta, and critical stagnation points. Mesh sensitivity and a thorough comparison against literature data together support the reliability of the CFD methodology. Image-based CFD simulations are efficient tools to assess the possibility of aortic dissection to lead to aneurysmal degeneration, and provide new knowledge on the hemodynamic characteristics of dissected versus healthy aortas. Similar analyses should be routinely included in patient-specific hemodynamics investigations, to plan and design tailored therapeutic strategies, and to timely assess their effectiveness.
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Affiliation(s)
- Simona Moretti
- DEIM Department of Economics, Engineering, Society and Business Administration, University of Tuscia, Largo dell’Università, 01100 Viterbo, Italy
| | - Flavia Tauro
- DIBAF Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, Via San Camillo de Lellis, 01100 Viterbo, Italy
- Correspondence: ; Tel.: +39-0761-357355
| | - Matteo Orrico
- Vascular and Endovascular Surgery Unit, San Camillo Forlanini Hospital, Circonvallazione Gianicolense 87, 00149 Roma, Italy
| | - Nicola Mangialardi
- Vascular and Endovascular Surgery Unit, San Camillo Forlanini Hospital, Circonvallazione Gianicolense 87, 00149 Roma, Italy
| | - Andrea Luigi Facci
- DEIM Department of Economics, Engineering, Society and Business Administration, University of Tuscia, Largo dell’Università, 01100 Viterbo, Italy
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12
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Lee GH, Heo W, Lee Y, Kim TH, Huh H, Song SW, Ha H. Fluid-structure interaction simulation of visceral perfusion and impact of different cannulation methods on aortic dissection. Sci Rep 2023; 13:1116. [PMID: 36670162 PMCID: PMC9860063 DOI: 10.1038/s41598-023-27855-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 01/09/2023] [Indexed: 01/22/2023] Open
Abstract
Hemodynamics in aortic dissection (AD) is closely associated with the risk of aortic aneurysm, rupture, and malperfusion. Altered blood flow in patients with AD can lead to severe complications such as visceral malperfusion. In this study, we aimed to investigate the effect of cannulation flow on hemodynamics in AD using a fluid-structure interaction simulation. We developed a specific-idealized AD model that included an intimal tear in the descending thoracic aorta, a re-entry tear in the left iliac artery, and nine branches. Two different cannulation methods were tested: (1) axillary cannulation (AC) only through the brachiocephalic trunk and (2) combined axillary and femoral cannulation (AFC) through the brachiocephalic trunk and the right common iliac artery. AC was found to result in the development of a pressure difference between the true lumen and false lumen, owing to the difference in the flow rate through each lumen. This pressure difference collapsed the true lumen, disturbing blood flow to the celiac and superior mesenteric arteries. However, in AFC, the pressure levels between the two lumens were similar, and no collapse occurred. Moreover, the visceral flow was higher than that in AC. Lastly, the stiffness of the intimal flap affected the true lumen's collapse.
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Affiliation(s)
- Gyu-Han Lee
- Department of Interdisciplinary Program in Biohealth-Machinery Convergence Engineering, Kangwon National University, Chuncheon, Republic of Korea
| | - Woon Heo
- Vascular Access Center, Lifeline Clinic, Busan, Republic of Korea
| | - Youngjin Lee
- Department of Smart Health Science and Technology, Kangwon National University, 1 Gangwondaehak-Gil, Chuncheon, 24341, Republic of Korea
| | - Tae-Hoon Kim
- Department of Thoracic and Cardiovascular Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, 211 Eonju-Ro, Gangnam-Gu, Seoul, 06273, Republic of Korea
| | - Hyungkyu Huh
- Daegu-Gyeongbuk Medical Innovation Foundation, Medical Device Development Center, Daegu, Republic of Korea
| | - Suk-Won Song
- Department of Thoracic and Cardiovascular Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, 211 Eonju-Ro, Gangnam-Gu, Seoul, 06273, Republic of Korea.
| | - Hojin Ha
- Department of Smart Health Science and Technology, Kangwon National University, 1 Gangwondaehak-Gil, Chuncheon, 24341, Republic of Korea.
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13
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Chen H, Su T, Wang Q, Zheng Z, Li H, Li J. Comparison of thrombosis risk in an abdominal aortic dissection aneurysm with a double false lumen using computational fluid dynamic simulation method. Technol Health Care 2022; 31:1003-1015. [PMID: 36442166 DOI: 10.3233/thc-220481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND: Aneurysms are associated with a mortality rate of 81% or more in cases of rupture. OBJECTIVE: To analyse the haemodynamic indices and compare the thrombosis risk in a double false lumen abdominal aortic dissection aneurysm using computational fluid dynamics (CFD). METHODS: Computer tomography angiography (CTA) imaging data were collected from a patient with a double false lumen abdominal aortic dissection aneurysm, and three different lesion morphology aneurysm models were established, double false lumen abdominal aortic dissection aneurysm, single false lumen abdominal aortic dissection aneurysm and saccular abdominal aortic aneurysm, in order to analyse the flow velocity, time-averaged shear stress (TAWSS), oscillatory shear index (OSI), relative residence time (RRT) of blood flow, and endothelial cell activation potential (ECAP). RESULTS: All three aneurysms were in a low-flow state within the body, and the low-flow velocity flow in the proximal vessel wall extended to the right common iliac artery; the vortex intensity was more intense in the abdominal aortic dissection aneurysm than in the saccular abdominal aortic aneurysm. The risk area for thrombosis was concentrated in the expansion part of the aneurysm and the false lumen. The RRT and ECAP maxima of the double false lumen abdominal aortic dissection aneurysm were much greater than those of the single false lumen dissection aneurysm and saccular aortic aneurysm. CONCLUSION: Low-velocity blood flow, high OSI, low TAWSS, high RRT, and high ECAP regions correlate with the risk of thrombosis. The double false lumen type of abdominal aortic dissection aneurysm had some specificity in this case. The risk of thrombosis in the patient was extremely high, and the largest risk zone was within the smaller false lumen, which could be because the smaller false lumen was connected to the true lumen by only one breach. The results of the study provide some guidance in the early screening and development of treatment plans.
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Affiliation(s)
- Hongbing Chen
- Department of Forensic Medicine, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Tong Su
- Department of Radiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qi Wang
- Department of Forensic Medicine, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Zhe Zheng
- Department of Forensic Medicine, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Hongwei Li
- Institute of Forensic Science, Chongqing Public Security Bureau, Chongqing, China
| | - Jianbo Li
- Department of Forensic Medicine, College of Basic Medicine, Chongqing Medical University, Chongqing, China
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Wang Q, Guo X, Brooks M, Chuen J, Poon EKW, Ooi A, Lim RP. MRI in CFD for chronic type B aortic dissection: Ready for prime time? Comput Biol Med 2022; 150:106138. [PMID: 36191393 DOI: 10.1016/j.compbiomed.2022.106138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/31/2022] [Accepted: 09/18/2022] [Indexed: 11/24/2022]
Abstract
OBJECTIVES Better tools are needed for risk assessment of Type B aortic dissection (TBAD) to determine optimal treatment for patients with uncomplicated disease. Magnetic resonance imaging (MRI) has the potential to inform computational fluid dynamics (CFD) simulations for TBAD by providing individualised quantification of haemodynamic parameters, for assessment of complication risks. This systematic review aims to present an overview of MRI applications for CFD studies of TBAD. METHODS Following PRISMA guidelines, a search in Medline, Embase, and the Scopus Library identified 136 potentially relevant articles. Studies were included if they used MRI to inform CFD simulation in TBAD. RESULTS There were 20 articles meeting the inclusion criteria. 19 studies used phase contrast MRI (PC-MRI) to provide data for CFD flow boundary conditions. In 12 studies, CFD haemodynamic parameter results were validated against PC-MRI. In eight studies, geometric models were developed from MR angiography. In three studies, aortic wall or intimal flap motion data were derived from PC/cine MRI. CONCLUSIONS MRI provides complementary patient-specific information in CFD haemodynamic studies for TBAD that can be used for personalised care. MRI provides structural, dynamic and flow data to inform CFD for pre-treatment planning, potentially advancing its integration into clinical decision-making. The use of MRI to inform CFD in TBAD surgical planning is promising, however further validation and larger cohort studies are required.
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Affiliation(s)
- Qingdi Wang
- Department of Mechanical Engineering, Melbourne School of Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Xiaojing Guo
- Department of Mechanical Engineering, Melbourne School of Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Mark Brooks
- Department of Radiology, Austin Health, Heidelberg, VIC, 3084, Australia; School of Medicine, Deakin University, Melbourne, Australia
| | - Jason Chuen
- Department of Surgery, Austin Health, Heidelberg, VIC, 3084, Australia; Department of Surgery, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Fitzroy, VIC, 3065, Australia
| | - Eric K W Poon
- Department of Medicine, St Vincent's Hospital, Melbourne Medical School, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Fitzroy, VIC, 3065, Australia
| | - Andrew Ooi
- Department of Mechanical Engineering, Melbourne School of Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Ruth P Lim
- Department of Radiology, Austin Health, Heidelberg, VIC, 3084, Australia; Department of Surgery, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Fitzroy, VIC, 3065, Australia; Department of Radiology, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, VIC, 3010, Australia
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15
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Morphological changes in vertebral artery dissections observed on 4D flow magnetic resonance images: case report. Acta Neurochir (Wien) 2022; 164:2881-2886. [PMID: 35948733 DOI: 10.1007/s00701-022-05333-4] [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: 03/22/2022] [Accepted: 07/20/2022] [Indexed: 02/01/2023]
Abstract
The morphology of vertebral artery (VA) dissections can change in the clinical course. A 58-year-old female with a 2-week headache was diagnosed with left VA dissection. Hemodynamic stress on the right VA detected on 4D flow MRI scans resulted in increased wall shear stress but the vessel was morphologically unchanged. Subsequent MRA revealed right VA dissection. Her bilateral dissections were treated conservatively and no neurological abnormality developed. Serial 4D flow MRI may be useful for observing morphological changes in VA dissections and help to clarify the mechanism(s) underlying VA dissections.
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16
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Liu D, Wang X, Zhao D, Sun Z, Biekan J, Wen Z, Xu L, Liu J. Influence of MRI-based boundary conditions on type B aortic dissection simulations in false lumen with or without abdominal aorta involvement. Front Physiol 2022; 13:977275. [PMID: 36160847 PMCID: PMC9490059 DOI: 10.3389/fphys.2022.977275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
Most computational hemodynamic studies of aortic dissections rely on idealized or general boundary conditions. However, numerical simulations that ignore the characteristics of the abdominal branch arteries may not be conducive to accurately observing the hemodynamic changes below the branch arteries. In the present study, two men (M-I and M-II) with type B aortic dissection (TBAD) underwent arterial-phase computed tomography angiography and four-dimensional flow magnetic resonance imaging (MRI) before and after thoracic endovascular aortic repair (TEVAR). The finite element method was used to simulate the computational fluid dynamic parameters of TBAD [false lumen (FL) with or without visceral artery involvement] under MRI-specific and three idealized boundary conditions in one cardiac cycle. Compared to the results of zero pressure and outflow boundary conditions, the simulations with MRI boundary conditions were closer to the initial MRI data. The pressure difference between true lumen and FL after TEVAR under the other three boundary conditions was lower than that of the MRI-specific results. The results of the outflow boundary conditions could not characterize the effect of the increased wall pressure near the left renal artery caused by the impact of Tear-1, which raised concerns about the distal organ and limb perfused by FL. After TEVAR, the flow velocity and wall pressure in the FL and the distribution areas of high time average wall shear stress and oscillating shear index were reduced. The difference between the calculation results for different boundary conditions was lower in M-II, wherein FL did not involve the abdominal aorta branches than in M-I. The boundary conditions of the abdominal branch arteries from MRI data might be valuable in elucidating the hemodynamic changes of the descending aorta in TBAD patients before and after treatment, especially those with FL involving the branch arteries.
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Affiliation(s)
- Dongting Liu
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Xuan Wang
- Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China
| | - Dongliang Zhao
- Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China
| | - Zhonghua Sun
- Discipline of Medical Radiation Science, Curtin Medical School, Curtin University, Perth, WA, Australia
- *Correspondence: Jiayi Liu, ; Zhonghua Sun,
| | | | - Zhaoying Wen
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Lei Xu
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Jiayi Liu
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
- *Correspondence: Jiayi Liu, ; Zhonghua Sun,
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17
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Kimura N, Nakamura M, Takagi R, Mieno MN, Yamaguchi A, Czerny M, Beyersdorf F, Kari FA, Rylski B. False lumen/true lumen wall pressure ratio is increased in acute non-A non-B aortic dissection. Interact Cardiovasc Thorac Surg 2022; 35:6585342. [PMID: 35552699 PMCID: PMC9486891 DOI: 10.1093/icvts/ivac138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 11/13/2022] Open
Abstract
Abstract
OBJECTIVES
We aimed to determine whether non-A non-B aortic dissection (AD) differs in morphologic and haemodynamic properties from type B AD.
METHODS
We simulated and compared haemodynamics of patients with acute type B or acute non-A non-B AD by means of computational fluid dynamics. Wall pressure and wall shear stress (WSS) in both the true lumen (TL) and false lumen (FL) at early, mid- and late systole were evaluated. Morphology, WSS and the FL/TL wall pressure ratio were compared between groups.
RESULTS
Nineteen patients (type B, n = 7; non-A non-B, n = 12) were included. The median age (51 [46, 67] vs 53 [50, 63] years; P = 0.71) and a complicated course (14% vs 33%; P = 0.6) did not differ between the type B group and the non-A non-B group. However, the median entry tear width was increased in the non-A non-B group (9.7 [7.3, 12.7] vs 16.3 [11.9, 24.9] mm; P = 0.010). Streamlines showed, in patients with non-A non-B AD, blood from the TL flowed into the FL via the entry tear. Prevalence of a FL/TL wall pressure ratio >1.0 (type B versus non-A non-B) at early, mid- and late systole was 57% vs 83% (P = 0.31), 43% vs 83% (P = 0.13) and 57% vs 75% (P = 0.62), respectively. WSS did not differ between the groups.
CONCLUSIONS
The increased FL/TL wall pressure ratio observed during systole in non-A non-B AD may beget a complicated presentation.
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Affiliation(s)
- Naoyuki Kimura
- Department of Cardiovascular Surgery, Saitama Medical Center, Jichi Medical University , Saitama, Japan
| | - Masanori Nakamura
- Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology , Nagoya, Japan
| | - Reiya Takagi
- Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology , Nagoya, Japan
| | - Makiko Naka Mieno
- Department of Medical Informatics, Center for Information, Jichi Medical University , Shimotsuke, Japan
| | - Atsushi Yamaguchi
- Department of Cardiovascular Surgery, Saitama Medical Center, Jichi Medical University , Saitama, Japan
| | - Martin Czerny
- Department of Cardiovascular Surgery, University Heart Centre Freiburg, University of Freiburg , Freiburg, Germany
| | - Friedhelm Beyersdorf
- Department of Cardiovascular Surgery, University Heart Centre Freiburg, University of Freiburg , Freiburg, Germany
| | - Fabian Alexander Kari
- Department of Cardiovascular Surgery, University Heart Centre Freiburg, University of Freiburg , Freiburg, Germany
| | - Bartosz Rylski
- Department of Cardiovascular Surgery, University Heart Centre Freiburg, University of Freiburg , Freiburg, Germany
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18
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Kamada H, Nakamura M, Ota H, Higuchi S, Takase K. Blood flow analysis with computational fluid dynamics and 4D-flow MRI for vascular diseases. J Cardiol 2022; 80:386-396. [PMID: 35718672 DOI: 10.1016/j.jjcc.2022.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 05/16/2022] [Indexed: 10/31/2022]
Abstract
Both computational fluid dynamics (CFD) and time-resolved, three-dimensional, phase-contrast, magnetic resonance imaging (4D-flow MRI) enable visualization of time-varying blood flow structures and quantification of blood flow in vascular diseases. However, they are totally different. CFD is a method to calculate blood flow by solving the governing equations of fluid mechanics, so the obtained flow field is somewhat virtual. On the other hand, 4D-flow MRI measures blood flow in vivo, thus the flow is real. Recently, with the development and enhancement of computers, medical imaging techniques, and related software, blood flow analysis has become more accessible to clinicians and its usefulness in vascular diseases has been demonstrated. In this review, we have outlined the methods and characteristics of CFD and 4D-flow MRI, respectively. We have discussed the differences in the characteristics between both methods; reviewed the milestones achieved by blood flow analysis in various vascular diseases; and discussed the usefulness, challenges, and limitations of blood flow analysis. We have discussed the difficulties and limitations of current blood flow analysis. We have also discussed our views on future directions.
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Affiliation(s)
- Hiroki Kamada
- Department of Diagnostic Radiology, Tohoku University Hospital, Sendai, Japan.
| | - Masanori Nakamura
- Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan
| | - Hideki Ota
- Department of Diagnostic Radiology, Tohoku University Hospital, Sendai, Japan
| | - Satoshi Higuchi
- Department of Diagnostic Radiology, Tohoku University Hospital, Sendai, Japan
| | - Kei Takase
- Department of Diagnostic Radiology, Tohoku University Hospital, Sendai, Japan
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19
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Wen J, Yan T, Su Z, Huang H, Gao Q, Chen X, Wong KKL, Peng L. Risk evaluation of type B aortic dissection based on WSS-based indicators distribution in different types of aortic arch. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 221:106872. [PMID: 35594583 DOI: 10.1016/j.cmpb.2022.106872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 04/26/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND OBJECTIVE The underlying mechanism of aortic dissection (AD) remains unclear and the onset of AD is still unpredictable. Although clinical study with statistical analysis has reported that type III aortic arch may have strong correlation with type B AD (TBD), the effects of different arch types on the wall shear stress (WSS) have not been clarified. METHODS As a complementary work, this study numerically investigated the distribution of five WSS-based indicators in thirty aortic arches without AD, which were classified into three groups based on the arch types. RESULTS The distribution of most WSS indicators, such as time averaged WSS (TAWSS), oscillatory shear index (OSI) and relative residence time (RRT) had no significant difference among different types of aortic arches (P>0.05). However, a multidirectional WSS index, namely CFI, was found its maximum value was positively correlated with type III aortic arch in proximal descending aorta (p<0.001, r = 0.65). CONCLUSIONS It can be concluded that the enhancement or oscillation of WSS may not be the main reason of TBD is prevalence in type III arches, while the multidirectional WSS distribution may be an important factor. It can be further referred that the CFI may have a potential to predict the onset of TBD.
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Affiliation(s)
- Jun Wen
- Institute of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
| | - Tingli Yan
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Zhiqiao Su
- Institute of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
| | - Haodi Huang
- Institute of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
| | - Qi Gao
- Institute of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
| | - Xiaoyi Chen
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Kelvin K L Wong
- School of Computer Science and Engineering, Central South University, Changsha 410000, China.
| | - Liqing Peng
- Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
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20
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Jiang C, Liu A, Huang L, Liu Q, Liu Y, Geng Q. Red Blood Cell Distribution Width: A Prognostic Marker in Patients With Type B Aortic Dissection Undergoing Endovascular Aortic Repair. Front Cardiovasc Med 2022; 9:788476. [PMID: 35586648 PMCID: PMC9108148 DOI: 10.3389/fcvm.2022.788476] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 03/31/2022] [Indexed: 11/13/2022] Open
Abstract
Background Red blood cell distribution width (RDW) is associated with cardiovascular mortality. However, the relationship between preoperative RDW and outcomes after thoracic endovascular aortic repair (TEVAR) in type B aortic dissection (TBAD) remains to be determined. Methods We review the records of 678 patients with TBAD and treated with TEVAR in three centers. Patients were divided into two groups according to the admission RDW cut-off by receiver operating characteristic curve analysis [≤13.5% (n = 278) and >13.5% (n = 400)]. The association between RDW and long-term mortality was evaluated using Cox survival analysis. Additionally, we used general additive models (GAM) with restricted cubic splines (RCS) to explore non-linear relationships between RDW and outcomes. Results Subjects with a high RDW had significantly higher in-hospital mortality rates (1.4 vs. 4.3%, P = 0.038). A total of 70 subjects died after a median follow-up period of 3.3 years. Kaplan–Meier analysis showed that subjects with an RDW >13.5% had worse survival rates than those with lower RDW values (P < 0.001). Multivariate Cox proportional hazard modeling revealed that an RDW >13.5% was an independent predictor of long-term mortality (adjusted HR = 2.27, P = 0.006). Also, we found that there was a non-linear relationship between RDW and mortality from RCS, and RDW of 13.5% might be an inflection point to distinguish the long-term mortality risk of TBAD patients. Conclusion As an inexpensive and routinely measured parameter, RDW holds promise as a novel prognostic marker in patients with TBAD receiving TEVAR. We found that an RDW >13.5% on admission was independently associated with increased long-term mortality.
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Affiliation(s)
- Cheng Jiang
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Anbang Liu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- School of Medicine, South China University of Technology, Guangzhou, China
| | - Lei Huang
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Quanjun Liu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- School of Medicine, South China University of Technology, Guangzhou, China
| | - Yuan Liu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Yuan Liu,
| | - Qingshan Geng
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- School of Medicine, South China University of Technology, Guangzhou, China
- *Correspondence: Qingshan Geng,
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21
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Shrestha S, Gu H, Xie W, He B, Zhao W, Tang Z, Nie L, Li Z. Assessment of association between the carotid web and dissection in spontaneous internal carotid artery dissection patients using vessel wall MRI. Acta Radiol 2021; 64:282-288. [PMID: 34894748 DOI: 10.1177/02841851211065144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
BACKGROUND Internal carotid artery dissection (ICAD) is the major cause of ischemic stroke in young to middle-aged people. Recognition of predisposing factors may facilitate in early individual risk prediction and expand treatment. PURPOSE To evaluate the association between a carotid web and dissection in patients with ICAD using vessel wall magnetic resonance imaging (VW-MRI). MATERIAL AND METHODS A retrospective study was conducted of 223 patients who underwent VW-MRI. Of these patients, 58 patients with craniocervical artery dissection (CCAD) (33 ICAD and 25 vertebrobasilar artery dissection [VBAD]) were included. The control group (n = 165) consisted of patients without arterial dissection who had undergone VW-MRI . The presence of a carotid web in the posterior aspect of carotid bulb was recorded. The distance between the carotid web and start of dissection in ICA was recorded. RESULTS The presence of a carotid web showed a significant difference between the ICAD, VBAD, and control groups (19 [57.6%] vs. 5 [20%] vs. 36 [21.8%], respectively; P < 0.001). In multi-nominal analysis, the presence of a carotid web showed a significant difference between the ICAD and VBAD groups and the ICAD and control groups (P < 0.05), with odds ratios of 5.41 (95% confidence interval [CI]=1.634-17.973) and 4.81 (95% CI=2.176-10.651), respectively. Out of 19 ICAD patients with carotid web, 16 had occurrence of dissection in the C1 segment of the ICA with a mean distance of 1.91 ± 1.71 cm from the carotid web. CONCLUSION Presence of a carotid web was more frequent in patients with ICAD. The carotid web may be one of the predisposing factors for development of dissection in patients with ICAD.
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Affiliation(s)
- Srijana Shrestha
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Heyi Gu
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Wei Xie
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Bo He
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Wei Zhao
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Zhiwei Tang
- Department of Neurosurgery, Kunming Medical University First Affiliated Hospital, Kunming, PR China
| | - Lisha Nie
- GE Healthcare, MR Research China, Beijing, PR China
| | - Zongfang Li
- Department of Radiology, Kunming Medical University First Affiliated Hospital, Kunming, PR China
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22
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Wang Y, Wang J, Peng J, Huo M, Yang Z, Giridharan GA, Luan Y, Qin K. Effects of a Short-Term Left Ventricular Assist Device on Hemodynamics in a Heart Failure Patient-Specific Aorta Model: A CFD Study. Front Physiol 2021; 12:733464. [PMID: 34621186 PMCID: PMC8491745 DOI: 10.3389/fphys.2021.733464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/20/2021] [Indexed: 11/24/2022] Open
Abstract
Patients with heart failure (HF) or undergoing cardiogenic shock and percutaneous coronary intervention require short-term cardiac support. Short-term cardiac support using a left ventricular assist device (LVAD) alters the pressure and flows of the vasculature by enhancing perfusion and improving the hemodynamic performance for the HF patients. However, due to the position of the inflow and outflow of the LVAD, the local hemodynamics within the aorta is altered with the LVAD support. Specifically, blood velocity, wall shear stress, and pressure difference are altered within the aorta. In this study, computational fluid dynamics (CFD) was used to elucidate the effects of a short-term LVAD for hemodynamic performance in a patient-specific aorta model. The three-dimensional (3D) geometric models of a patient-specific aorta and a short-term LVAD, Impella CP, were created. Velocity, wall shear stress, and pressure difference in the patient-specific aorta model with the Impella CP assistance were calculated and compared with the baseline values of the aorta without Impella CP support. Impella CP support augmented cardiac output, blood velocity, wall shear stress, and pressure difference in the aorta. The proposed CFD study could analyze the quantitative changes in the important hemodynamic parameters while considering the effects of Impella CP, and provide a scientific basis for further predicting and assessing the effects of these hemodynamic signals on the aorta.
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Affiliation(s)
- Yu Wang
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China
| | - Junwei Wang
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China
| | - Jing Peng
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China
| | - Mingming Huo
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China
| | - Zhiqiang Yang
- Department of Cardiovascular Computed Tomography (CT) Examination, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | | | - Yong Luan
- Department of Anesthesiology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Kairong Qin
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China
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23
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Wu S, Cao C, Lun Y, Jiang H, Wang S, He Y, Sun J, Li X, He Y, Huang Y, Chen W, Xin S, Zhang J. Age-related differences in acute aortic dissection. J Vasc Surg 2021; 75:473-483.e4. [PMID: 34562571 DOI: 10.1016/j.jvs.2021.08.086] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/23/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The present study investigated the differences in clinical characteristics, treatments, and outcomes of patients with acute aortic dissection (AAD) in different age groups. METHODS The present single-center retrospective study was conducted from August 2014 to August 2020. The patients were divided into three groups: age <45 years (young group), age 45 to 59 years (middle-age group), and age >59 years (elderly group). Type A (TAAD) and type B (TBAD) aortic dissection were evaluated separately using the latest definitions. RESULTS The mean age at onset was 52.4 years in our cohort of 602 patients. The young group included a large proportion of male patients (86%). The body mass index and body surface area were higher in the young group. The proportion of non-true lumen blood supply of branches on the abdominal aorta in the young group (27%-55%) was greater than that in the others. In the young group, the distal extent of dissection in 84% of TAAD and 89% of TBAD exceeded the abdominal aortic branch cluster (AABC) compared with 36% of TAAD and 58% of TBAD in the elderly group. The multivariate analysis revealed that age <45 years (odds ratio, 5.15; P < .001) and D-dimer level (odds ratio, 1.05; P = .001) were risk factors for intimal flap tear exceeding the AABC. The proportion of visceral and lower limb malperfusion increased from 4.8% to 36.9% as the intimal flap tear exceeded the AABC. CONCLUSIONS Compared with middle-age and elderly patients, young patients with AAD had two characteristics (ie, obesity and an intimal flap that had frequently exceeded the branches of the aorta). These two factors resulted in a greater proportion of non-true lumen blood supply, increased visceral and lower limb malperfusion, and an increase in potential associated risks.
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Affiliation(s)
- Song Wu
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Chenghao Cao
- Department of Radiology, The First Hospital, China Medical University, Shenyang, China
| | - Yu Lun
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Han Jiang
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Shiyue Wang
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Yuchen He
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Jianjian Sun
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Xin Li
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Yuzhen He
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Yinde Huang
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Wenbin Chen
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Shijie Xin
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China
| | - Jian Zhang
- Department of Vascular and Thyroid Surgery, The First Hospital, China Medical University, Shenyang, China.
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24
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van Hout MJP, Juffermans JF, Scholte AJ, Lamb HJ. 4D flow MRI of type B dissection with later retrograde progression to type A dissection in Marfan: a case report. Eur Heart J Case Rep 2021; 5:ytab288. [PMID: 34514302 PMCID: PMC8422331 DOI: 10.1093/ehjcr/ytab288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 05/22/2021] [Accepted: 06/30/2021] [Indexed: 11/23/2022]
Abstract
Background Due to the malfunction of connective tissue, Marfan patients are at increased risk of aortic dissection. Uncomplicated acute type B dissection is usually managed with medical therapy. Retrograde progression or new type A dissection is a relatively rare but often fatal complication that occur most frequently in the first 6 months after acute type B dissection. Case summary We present a 31-year-old male with Marfan syndrome and a recent uncomplicated type B dissection from the left subclavian to the right common iliac artery who underwent 4D flow magnetic resonance imaging (MRI). The dissection had a large proximal intimal tear just distal to the left subclavian artery (15 mm) and large false lumen (35 mm). Aortic blood flow just distal to the left subclavian artery (3.6 L/min) was split disproportionately into the true (0.8 L/min, 22%) and false lumen (2.8 L/min, 78%). 4D flow streamlines revealed vortical flow in the proximal false lumen. Increased wall shear stress was observed at the sinotubular junction (STJ), inner wall of the ascending aorta and around the subclavian artery. Two weeks after MRI, the patient presented with jaw pain. Computed tomography showed a type A dissection with an entry tear at the STJ for which an acute valve-sparing root, ascending and arch replacement was performed. Discussion Better risk assessment of life-threatening complications in uncomplicated type B dissections could improve treatment strategies in these patients. Our case demonstrates that besides clinical and morphological parameters, flow derived parameters could aid in improved risk assessment for retrograde progression from uncomplicated type B dissection to acute type A dissection.
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Affiliation(s)
- Max J P van Hout
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Joe F Juffermans
- Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Arthur J Scholte
- Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
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25
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Zilber ZA, Boddu A, Malaisrie SC, Hoel AW, Mehta CK, Vassallo P, Burris NS, Roldán-Alzate A, Collins JD, François CJ, Allen BD. Noninvasive Morphologic and Hemodynamic Evaluation of Type B Aortic Dissection: State of the Art and Future Perspectives. Radiol Cardiothorac Imaging 2021; 3:e200456. [PMID: 34235440 DOI: 10.1148/ryct.2021200456] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 05/04/2021] [Accepted: 05/05/2021] [Indexed: 12/21/2022]
Abstract
Stanford type B aortic dissection (TBAD) is associated with relatively high rates of morbidity and mortality, and appropriate treatment selection is important for optimizing patient outcomes. Depending on individualized risk factors, clinical presentation, and imaging findings, patients are generally stratified to optimal medical therapy anchored by antihypertensives or thoracic endovascular aortic repair (TEVAR). Using standard anatomic imaging with CT or MRI, several high-risk features including aortic diameter, false lumen (FL) features, size of entry tears, involvement of major aortic branch vessels, or evidence of visceral malperfusion have been used to select patients likely to benefit from TEVAR. However, even with these measures, the number needed to treat for TEVAR remains, and improved risk stratification is needed. Increasingly, the relationship between FL hemodynamics and adverse aortic remodeling in TBAD has been studied, and evolving noninvasive techniques can measure numerous FL hemodynamic parameters that may improve risk stratification. In addition to summarizing the current clinical state of the art for morphologic TBAD evaluation, this review provides a detailed overview of noninvasive methods for TBAD hemodynamics characterization, including computational fluid dynamics and four-dimensional flow MRI. Keywords: CT, Image Postprocessing, MRI, Cardiac, Vascular, Aorta, Dissection © RSNA, 2021.
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Affiliation(s)
- Zachary A Zilber
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Aayush Boddu
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - S Chris Malaisrie
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Andrew W Hoel
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Christopher K Mehta
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Patricia Vassallo
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Nicholas S Burris
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Alejandro Roldán-Alzate
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Jeremy D Collins
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Christopher J François
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
| | - Bradley D Allen
- Department of Radiology (Z.A.Z., A.B., B.D.A.), Department of Surgery-Division of Cardiac Surgery (S.C.M., C.K.M.), Department of Surgery-Division of Vascular Surgery (A.W.H.), and Department of Medicine-Division of Cardiology (P.V.), Northwestern University Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611; Department of Radiology, University of Michigan, Ann Arbor, Mich (N.S.B.); Departments of Mechanical Engineering and Radiology, University of Wisconsin-Madison, Madison, Wis (A.R.A.); and Department of Radiology, Mayo Clinic, Rochester, Minn (J.D.C., C.J.F.)
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26
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Wang J, Wang Y, Sheng L, He T, Nin X, Xue A, Zhang H, Liu Z. High fluid shear stress prevents atherosclerotic plaque formation by promoting endothelium denudation and synthetic phenotype of vascular smooth muscle cells. Mol Med Rep 2021; 24:577. [PMID: 34132364 PMCID: PMC8223103 DOI: 10.3892/mmr.2021.12216] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 03/25/2021] [Indexed: 11/05/2022] Open
Abstract
Low blood fluid shear stress (SS) promotes vascular remodeling and atherosclerosis; however, the effects of high (H)SS on vascular remodeling and atherogenesis is not fully clarified. The major goal of this study was to investigate the role of HSS in atherosclerotic plaque formation. A perivascular SS modifier was implanted in the right carotid artery of apolipoprotein E (ApoE)−/− mice to induce HSS, whereas the left carotid artery represented undisturbed (U)SS as a control in vivo. In vitro modeling used human umbilical vein endothelial cells and vascular smooth muscle cells exposed to HSS (2.5 Pa) using a parallel-plate flow system. The results demonstrated that there were no plaque formations or endothelial cells in the HSS regions of the carotid artery in ApoE−/− mice. The number of umbilical vein endothelial cells was markedly decreased in a time-dependent manner in HSS. HSS significantly decreased α-smooth muscle actin and increased osteopontin protein expression levels compared with USS in vascular smooth muscle cells (P<0.05). In addition, HSS significantly increased the protein expression levels of collagen α1(XVIII) chain/endostatin and matrix metalloproteinase-8 in vascular smooth muscle cells. These data indicated that HSS may prevent atherosclerotic plaque formation through endothelium denudation and contractile-to-synthetic phenotypic conversion of smooth muscle cells.
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Affiliation(s)
- Juan Wang
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Yan Wang
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Lin Sheng
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Tian He
- Department of Anesthesiology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
| | - Xiang Nin
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Aiying Xue
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Hua Zhang
- Cardio‑Cerebrovascular Control and Research Center, Basic Medical College, Shandong First Medical University, Jinan, Shandong 250062, P.R. China
| | - Zhendong Liu
- Cardio‑Cerebrovascular Control and Research Center, Basic Medical College, Shandong First Medical University, Jinan, Shandong 250062, P.R. China
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27
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Deng L, Qin H, Guan Z, Mu Q, Xia Q, Wang M, Huang WH, Gu K. Computational numerical analysis of different cannulation methods during cardiopulmonary bypass of type A aortic dissection model based on computational fluid dynamics. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:667. [PMID: 33987365 PMCID: PMC8106110 DOI: 10.21037/atm-21-605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background The aim of the present study was to use a numerical simulation based on computational fluid dynamics (CFD) to analyze the difference of different cannulation methods on hemodynamics characteristic in a type A aortic dissection (TAAD) model. Methods A finite-element analysis based on the CFD model of a TAAD patient was used, and axillary artery cannulation (AAC), innominate artery cannulation (IAC), and femoral artery cannulation (FAC) were analyzed under different situations, including a cardiac output (CO) of 2.5 L/min and cardiopulmonary bypass (CPB) of 2.5 L/min (partial CPB before cross-clamping aorta, defined as condition A), and a CO of 0 L/min and CPB of 5 L/min (aortic cross-clamping phase, defined as condition B). The insertion of an 8-mm cannula into the different models was simulated. Hemodynamic characteristics, including wall shear stress, wall stress, blood flow, and velocity were analyzed. Results In condition A, the total flow of branches of the aortic arch was 2,009.5 mL/min (AAC), 1,855.47 mL/min (IAC), and 1,648.03 mL/min (FAC). All cannulation methods improved left renal blood perfusion. However, in relation to blood flow in the right renal artery, FAC showed the highest blood flow (105 mL/min). The results in condition B were similar to those of condition A. The velocity, shear stress, and stress of entry tear via AAC and IAC decreased in condition B compared with condition A. The velocity, shear stress, stress of tear via AAC was lower than that of IAC. Conclusions Different cannulation modes have an effect on the hemodynamic characteristic of the tear, but this effect is related to different states of CPB. AAC was found to superior to IAC, especially in reducing velocity, stress, and shear stress of site of tear. However, IAC and AAC are more conductive to blood supply than FAC in branch vessels of the aortic arch without being affected by the CPB state.
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Affiliation(s)
- Li Deng
- Affiliated Gaozhou Hospital of Guangdong Medical University, Gaozhou, China.,Clinical Research Center of Digital Medicine and 3D Printing, Department of Cardiovascular Surgery, The People's Hospital of Gaozhou, Gaozhou, China
| | - Hao Qin
- Clinical Research Center of Digital Medicine and 3D Printing, Department of Cardiovascular Surgery, The People's Hospital of Gaozhou, Gaozhou, China
| | - Zhiyuan Guan
- Peking University Third Hospital, Beijing, China
| | - Qingchun Mu
- Clinical Research Center of Digital Medicine and 3D Printing, Department of Cardiovascular Surgery, The People's Hospital of Gaozhou, Gaozhou, China
| | - Qingping Xia
- Clinical Research Center of Digital Medicine and 3D Printing, Department of Cardiovascular Surgery, The People's Hospital of Gaozhou, Gaozhou, China
| | - Maosheng Wang
- Clinical Research Center of Digital Medicine and 3D Printing, Department of Cardiovascular Surgery, The People's Hospital of Gaozhou, Gaozhou, China
| | - Wen-Hua Huang
- Orthopaedic Center, Affiliated Hospital of Guangdong Medical University, Guangdong Medical University, Zhanjiang, China.,Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Kaiyun Gu
- National Clinical Research Center for Child Health, The Children's Hospital Zhejiang University School of Medicine, Hangzhou, China
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28
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Bonfanti M, Franzetti G, Homer-Vanniasinkam S, Díaz-Zuccarini V, Balabani S. A Combined In Vivo, In Vitro, In Silico Approach for Patient-Specific Haemodynamic Studies of Aortic Dissection. Ann Biomed Eng 2020; 48:2950-2964. [PMID: 32929558 PMCID: PMC7723947 DOI: 10.1007/s10439-020-02603-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/02/2020] [Indexed: 12/30/2022]
Abstract
The optimal treatment of Type-B aortic dissection (AD) is still a subject of debate, with up to 50% of the cases developing late-term complications requiring invasive intervention. A better understanding of the patient-specific haemodynamic features of AD can provide useful insights on disease progression and support clinical management. In this work, a novel in vitro and in silico framework to perform personalised studies of AD, informed by non-invasive clinical data, is presented. A Type-B AD was investigated in silico using computational fluid dynamics (CFD) and in vitro by means of a state-of-the-art mock circulatory loop and particle image velocimetry (PIV). Both models not only reproduced the anatomical features of the patient, but also imposed physiologically-accurate and personalised boundary conditions. Experimental flow rate and pressure waveforms, as well as detailed velocity fields acquired via PIV, are extensively compared against numerical predictions at different locations in the aorta, showing excellent agreement. This work demonstrates how experimental and numerical tools can be developed in synergy to accurately reproduce patient-specific AD blood flow. The combined platform presented herein constitutes a powerful tool for advanced haemodynamic studies for a range of vascular conditions, allowing not only the validation of CFD models, but also clinical decision support, surgical planning as well as medical device innovation.
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Affiliation(s)
- Mirko Bonfanti
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Department of Medical Physics and Biomedical Engineering, University College London, 43-45 Foley Street, London, W1W 7TS UK
| | - Gaia Franzetti
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE UK
| | - Shervanthi Homer-Vanniasinkam
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Department of Medical Physics and Biomedical Engineering, University College London, 43-45 Foley Street, London, W1W 7TS UK
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE UK
- Leeds Teaching Hospitals NHS Trust, Great George Street, Leeds, LS1 3EX UK
| | - Vanessa Díaz-Zuccarini
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Department of Medical Physics and Biomedical Engineering, University College London, 43-45 Foley Street, London, W1W 7TS UK
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE UK
| | - Stavroula Balabani
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE UK
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29
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Effect of Geometric Accuracy at the Proximal Landing Zone on Simulation Results for Thoracic Endovascular Repair Patients. Cardiovasc Eng Technol 2020; 11:679-688. [PMID: 33145725 DOI: 10.1007/s13239-020-00498-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/20/2020] [Indexed: 02/05/2023]
Abstract
PURPOSE Existing hemodynamic studies on aortic dissection after thoracic endovascular aortic repair (TEVAR) apply geometric simplifications. This study aims to evaluate the necessity of more accurate geometries at the proximal landing zone in computational fluid dynamic (CFD) studies. METHODS Three patient-specific 3D aortic dissection models with different geometric accuracies at the proximal landing zone were manually fabricated for CFD simulations: (i) model 1 without the stent graft (SG), (ii) model 2 with the metal stent, and (iii) model 3 with the SG. The flow distribution, flow pattern, and wall shear stress (WSS)-related indicators in these three models were compared. RESULTS The flow distributions were quite similar for the three models, with a maximum absolute difference of 0.27% at the left suclavian artery (LSA) between models 1 and 3 because of partial coverage. A more chaotic flow pattern was observed at the proximal landing zone in model 3, with significant regional differences in the WSS-related indicator distributions. The upstream and downstream WSS-related indicator distributions were quite similar for the three models. CONCLUSIONS The flow pattern and hemodynamic parameter distributions were affected by the geometric accuracy only in a small region near the proximal landing zone. The flow split was hardly affected by the LSA partial coverage, indicating that the coverage may have slight effects on short-term blood perfusion. However, this conclusion needs to be verified in future studies with larger sample sizes.
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Armour CH, Guo B, Pirola S, Saitta S, Liu Y, Dong Z, Xu XY. The influence of inlet velocity profile on predicted flow in type B aortic dissection. Biomech Model Mechanobiol 2020; 20:481-490. [PMID: 33068193 PMCID: PMC7979630 DOI: 10.1007/s10237-020-01395-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 10/06/2020] [Indexed: 02/07/2023]
Abstract
In order for computational fluid dynamics to provide quantitative parameters to aid in the clinical assessment of type B aortic dissection, the results must accurately mimic the hemodynamic environment within the aorta. The choice of inlet velocity profile (IVP) therefore is crucial; however, idealised profiles are often adopted, and the effect of IVP on hemodynamics in a dissected aorta is unclear. This study examined two scenarios with respect to the influence of IVP—using (a) patient-specific data in the form of a three-directional (3D), through-plane (TP) or flat IVP; and (b) non-patient-specific flow waveform. The results obtained from nine simulations using patient-specific data showed that all forms of IVP were able to reproduce global flow patterns as observed with 4D flow magnetic resonance imaging. Differences in maximum velocity and time-averaged wall shear stress near the primary entry tear were up to 3% and 6%, respectively, while pressure differences across the true and false lumen differed by up to 6%. More notable variations were found in regions of low wall shear stress when the primary entry tear was close to the left subclavian artery. The results obtained with non-patient-specific waveforms were markedly different. Throughout the aorta, a 25% reduction in stroke volume resulted in up to 28% and 35% reduction in velocity and wall shear stress, respectively, while the shape of flow waveform had a profound influence on the predicted pressure. The results of this study suggest that 3D, TP and flat IVPs all yield reasonably similar velocity and time-averaged wall shear stress results, but TP IVPs should be used where possible for better prediction of pressure. In the absence of patient-specific velocity data, effort should be made to acquire patient’s stroke volume and adjust the applied IVP accordingly.
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Affiliation(s)
- Chlöe Harriet Armour
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Baolei Guo
- Department of Vascular Surgery, Zhongshan Hospital, Institute of Vascular Surgery, Fudan University, Shanghai, China
| | - Selene Pirola
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Simone Saitta
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Yifan Liu
- Department of Vascular Surgery, Zhongshan Hospital, Institute of Vascular Surgery, Fudan University, Shanghai, China
| | - Zhihui Dong
- Department of Vascular Surgery, Zhongshan Hospital, Institute of Vascular Surgery, Fudan University, Shanghai, China.
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK.
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Usai MV, Nugroho NT, Oberhuber A, Asciutto G. Influence of TEVAR on blood pressure in subacute type B aortic dissection (TBAD) patients with refractory and non-refractory arterial hypertension. INT ANGIOL 2020; 40:60-66. [PMID: 32959641 DOI: 10.23736/s0392-9590.20.04433-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Aim of this study was to compare the modifications of systemic blood pressure in patients with subacute type b aortic dissection (TBAD) and refractory (rHTN) and non-refractory arterial hypertension (N-rHTN) treated by thoracic endovascular aortic repair (TEVAR). METHODS Patients were divided into two groups, rHTN defined as blood pressure >140/90 mmHg with ≥5 antihypertensive drugs and patients with N-rHTN. Primary endpoint was the variation of mean systolic, diastolic and overall pressure (MSP, MDP and MAP) before and after antihypertensive treatment or TEVAR. Secondary endpoints were the 30-days mortality. Fifty-seven patients were included in this study. RESULTS Of the 44 Patients of the TEVAR group 21 were included in the N-rHTN group. The MSP before and after surgery for the N-rHTN group was 130 (±10 SD) and 111 (±22 SD) mmHg, P=0.01. In the rHTN group 164 (±17 SD) and 118 (±17 SD) mmHg (P=0.01). The reduction of MSP was greater in the rHTN group (P=0.01). The MAP before and after the TEVAR for the N-rHTN group was 90 (±10 SD) and 74 (±12 SD) mmHg (P=0.01), in the rHTN group 111 (±14 SD) and 70 (±9 SD) mmHg (P=0.01). The overall mortality rate group was 2.2% (1/44). CONCLUSIONS TEVAR for TBAD appears to positively affect blood pressure in patients with rHTN and N-rHTN.
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Affiliation(s)
- Marco V Usai
- Department of Vascular and Endovascular Surgery, University Hospital of Münster, Münster, Germany -
| | - Nyityasmono T Nugroho
- Department of Vascular and Endovascular Surgery, University Hospital of Münster, Münster, Germany
| | - Alexander Oberhuber
- Department of Vascular and Endovascular Surgery, University Hospital of Münster, Münster, Germany
| | - Giuseppe Asciutto
- Department of Vascular and Endovascular Surgery, University Hospital of Münster, Münster, Germany
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Hahn LD, Mistelbauer G, Higashigaito K, Koci M, Willemink MJ, Sailer AM, Fischbein M, Fleischmann D. CT-based True- and False-Lumen Segmentation in Type B Aortic Dissection Using Machine Learning. Radiol Cardiothorac Imaging 2020; 2:e190179. [PMID: 33778582 DOI: 10.1148/ryct.2020190179] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 12/18/2019] [Accepted: 01/02/2020] [Indexed: 01/25/2023]
Abstract
Purpose To develop a segmentation pipeline for segmentation of aortic dissection CT angiograms into true and false lumina on multiplanar reformations (MPRs) perpendicular to the aortic centerline and derive quantitative morphologic features, specifically aortic diameter and true- or false-lumen cross-sectional area. Materials and Methods An automated segmentation pipeline including two convolutional neural network (CNN) segmentation algorithms was developed. The algorithm derives the aortic centerline, generates MPRs orthogonal to the centerline, and segments the true and false lumina. A total of 153 CT angiograms obtained from 45 retrospectively identified patients (mean age, 50 years; range, 22-79 years) were used to train (n = 103), validate (n = 22), and test (n = 28) the CNN pipeline. Accuracy was evaluated by using the Dice similarity coefficient (DSC). Segmentations were then used to derive the maximal diameter of test-set patients and cross-sectional area profiles of the true and false lumina. Results The segmentation pipeline yielded a mean DSC of 0.873 ± 0.056 for the true lumina and 0.894 ± 0.040 for the false lumina of test-set cases. Automated maximal diameter measurements correlated well with manual measurements (R 2 = 0.95). Profiles of cross-sectional diameter, true-lumen area, and false-lumen area over several follow-up examinations were derived. Conclusion A segmentation pipeline was used to accurately identify true and false lumina on CT angiograms of aortic dissection. These segmentations can be used to obtain diameter and other morphologic parameters for surveillance and risk stratification.Supplemental material is available for this article.© RSNA, 2020.
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Affiliation(s)
- Lewis D Hahn
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Gabriel Mistelbauer
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Kai Higashigaito
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Martin Koci
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Martin J Willemink
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Anna M Sailer
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Michael Fischbein
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
| | - Dominik Fleischmann
- Departments of Radiology (L.D.H., G.M., K.H., M.K., M.J.W., A.M.S., D.F.) and Surgery (M.F.), Stanford University School of Medicine, 300 Pasteur Dr, Room S-072, Stanford, CA 94305-5105
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Computational Fluid Dynamics Modeling of Hemodynamic Parameters in the Human Diseased Aorta: A Systematic Review. Ann Vasc Surg 2020; 63:336-381. [DOI: 10.1016/j.avsg.2019.04.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 03/09/2019] [Accepted: 04/18/2019] [Indexed: 02/07/2023]
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Hori S, Hori E, Umemura K, Shibata T, Okamoto S, Kubo M, Horie Y, Kuroda S. Anatomical Variations of Vertebrobasilar Artery are Closely Related to the Occurrence of Vertebral Artery Dissection-An MR Angiography Study. J Stroke Cerebrovasc Dis 2020; 29:104636. [PMID: 32008922 DOI: 10.1016/j.jstrokecerebrovasdis.2020.104636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 12/09/2019] [Accepted: 12/31/2019] [Indexed: 01/22/2023] Open
Abstract
GOAL Intracranial arterial dissection is a major cause of ischemic stroke and subarachnoid hemorrhage in relatively young patients. We assessed the hypothesis that the tortuosity of the vertebrobasilar artery is associated with the occurrence of vertebral artery (VA) dissection, using MR angiography (MRA). MATERIALS AND METHODS This study enrolled 43 patients with VA dissection, and 63 age- and sex-matched healthy subjects were used as the controls. MRA was employed to evaluate the presence of dominant VA and the lateral shift of vertebrobasilar junction in both groups. The VA diameters were considered different when the difference was greater than .3 mm. These anatomical variations were divided into 3 types: Type 1 (vertebrobasilar junction within 2 mm from the midline), Type 2 (>2 mm-lateral shift of vertebrobasilar junction to the ipsilateral side of the dominant VA), and Type 3 (>2 mm-lateral shift of vertebrobasilar junction to the contralateral side of the dominant VA). FINDINGS The presence of dominant VA and the lateral shift of vertebrobasilar junction were more prevalent in patients with VA dissection than in the controls (OR: 3.46, P = .013, and OR: 4.51, P = .001, respectively). The lateral shift of vertebrobasilar junction was classified into Type 1 (n = 6), Type 2 (n = 13), and Type 3 (n = 17) among patients with VA dissection, while into Type 1 (n = 20), Type 2 (n = 8), and Type 3 (n = 7) among the controls. Type 3 predominance was observed in patients with VA dissection (P = .02). CONCLUSIONS Anatomical variations of the vertebrobasilar artery may play an important role in the occurrence of VA dissection.
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Affiliation(s)
- Satoshi Hori
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan.
| | - Emiko Hori
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Kimiko Umemura
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Takashi Shibata
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Soushi Okamoto
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Michiya Kubo
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Yukio Horie
- Department of Neurosurgery, Stroke Center, Saiseikai Toyama Hospital, Toyama, Japan
| | - Satoshi Kuroda
- Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Toyama, Japan
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Bäumler K, Vedula V, Sailer AM, Seo J, Chiu P, Mistelbauer G, Chan FP, Fischbein MP, Marsden AL, Fleischmann D. Fluid-structure interaction simulations of patient-specific aortic dissection. Biomech Model Mechanobiol 2020; 19:1607-1628. [PMID: 31993829 DOI: 10.1007/s10237-020-01294-8] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 01/14/2020] [Indexed: 12/01/2022]
Abstract
Credible computational fluid dynamic (CFD) simulations of aortic dissection are challenging, because the defining parallel flow channels-the true and the false lumen-are separated from each other by a more or less mobile dissection membrane, which is made up of a delaminated portion of the elastic aortic wall. We present a comprehensive numerical framework for CFD simulations of aortic dissection, which captures the complex interplay between physiologic deformation, flow, pressures, and time-averaged wall shear stress (TAWSS) in a patient-specific model. Our numerical model includes (1) two-way fluid-structure interaction (FSI) to describe the dynamic deformation of the vessel wall and dissection flap; (2) prestress and (3) external tissue support of the structural domain to avoid unphysiologic dilation of the aortic wall and stretching of the dissection flap; (4) tethering of the aorta by intercostal and lumbar arteries to restrict translatory motion of the aorta; and a (5) independently defined elastic modulus for the dissection flap and the outer vessel wall to account for their different material properties. The patient-specific aortic geometry is derived from computed tomography angiography (CTA). Three-dimensional phase contrast magnetic resonance imaging (4D flow MRI) and the patient's blood pressure are used to inform physiologically realistic, patient-specific boundary conditions. Our simulations closely capture the cyclical deformation of the dissection membrane, with flow simulations in good agreement with 4D flow MRI. We demonstrate that decreasing flap stiffness from [Formula: see text] to [Formula: see text] kPa (a) increases the displacement of the dissection flap from 1.4 to 13.4 mm, (b) decreases the surface area of TAWSS by a factor of 2.3, (c) decreases the mean pressure difference between true lumen and false lumen by a factor of 0.63, and (d) decreases the true lumen flow rate by up to 20% in the abdominal aorta. We conclude that the mobility of the dissection flap substantially influences local hemodynamics and therefore needs to be accounted for in patient-specific simulations of aortic dissection. Further research to accurately measure flap stiffness and its local variations could help advance future CFD applications.
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Affiliation(s)
- Kathrin Bäumler
- 3D and Quantitative Imaging Laboratory, Department of Radiology, Stanford University, Stanford, CA, 94305, USA.
| | - Vijay Vedula
- Department of Pediatrics (Cardiology), Stanford University, Stanford, CA, 94305, USA
| | - Anna M Sailer
- 3D and Quantitative Imaging Laboratory, Department of Radiology, Stanford University, Stanford, CA, 94305, USA
| | - Jongmin Seo
- Department of Pediatrics (Cardiology), Stanford University, Stanford, CA, 94305, USA
| | - Peter Chiu
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, 94305, USA
| | - Gabriel Mistelbauer
- Department of Simulation and Graphics, University of Magdeburg, Magdeburg, Germany
| | - Frandics P Chan
- 3D and Quantitative Imaging Laboratory, Department of Radiology, Stanford University, Stanford, CA, 94305, USA
| | - Michael P Fischbein
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, 94305, USA
| | - Alison L Marsden
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA
| | - Dominik Fleischmann
- 3D and Quantitative Imaging Laboratory, Department of Radiology, Stanford University, Stanford, CA, 94305, USA
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Munshi B, Parker LP, Norman PE, Doyle BJ. The application of computational modeling for risk prediction in type B aortic dissection. J Vasc Surg 2019; 71:1789-1801.e3. [PMID: 31831314 DOI: 10.1016/j.jvs.2019.09.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 09/04/2019] [Indexed: 02/06/2023]
Abstract
OBJECTIVE New tools are urgently needed to help with surgical decision-making in type B aortic dissection (TBAD) that is uncomplicated at the time of initial presentation. This narrative review aims to answer the clinical question, Can computational modeling be used to predict risk in acute and chronic Stanford TBAD? METHODS The review (PROSPERO 2018 CRD42018104472) focused on risk prediction in TBAD. A comprehensive search of the Ovid MEDLINE database, using terms related to computational modeling and aortic dissection, was conducted to find studies of any form published between 1998 and 2018. Cohort studies, case series, and case reports of adults (older than 18 years) with computed tomography or magnetic resonance imaging diagnosis of TBAD were included. Computational modeling was applied in all selected studies. RESULTS There were 37 studies about computational modeling of TBAD identified from the search, and the findings were synthesized into a narrative review. Computational modeling can produce numerically calculated values of stresses, pressures, and flow velocities that are difficult to measure in vivo. Hemodynamic parameters-high or low wall shear stress, high pressure gradient between lumens during the cardiac cycle, and high false lumen flow rate-have been linked to the pathogenesis of branch malperfusion and aneurysm formation by numerous studies. Considering the major outcomes of end-organ failure, aortic rupture, and stabilization and remodeling, hypotheses have been generated about inter-relationships of measurable parameters in computational models with observable anatomic and pathologic changes, resulting in specific clinical outcomes. CONCLUSIONS There is consistency in study findings about computational modeling in TBAD, although a limited number of patients have been analyzed using various techniques. The mechanistic patterns of association found in this narrative review should be investigated in larger cohort prospective studies to further refine our understanding. It highlights the importance of patient-specific computational hemodynamic parameters in clinical decision-making algorithms. The current challenge is to develop and to test a risk assessment method that can be used by clinicians for TBAD.
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Affiliation(s)
- Bijit Munshi
- Vascular Engineering Laboratory, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Australia; Centre for Medical Research, The University of Western Australia, Perth, Australia; Medical School, The University of Western Australia, Perth, Australia; Department of Vascular Surgery, Fiona Stanley Hospital, Perth, Australia
| | - Louis P Parker
- Vascular Engineering Laboratory, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Australia; Centre for Medical Research, The University of Western Australia, Perth, Australia; School of Engineering, The University of Western Australia, Perth, Australia
| | - Paul E Norman
- Vascular Engineering Laboratory, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Australia; Centre for Medical Research, The University of Western Australia, Perth, Australia; Medical School, The University of Western Australia, Perth, Australia; Department of Vascular Surgery, Fiona Stanley Hospital, Perth, Australia
| | - Barry J Doyle
- Vascular Engineering Laboratory, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Australia; Centre for Medical Research, The University of Western Australia, Perth, Australia; School of Engineering, The University of Western Australia, Perth, Australia.
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Pirola S, Guo B, Menichini C, Saitta S, Fu W, Dong Z, Xu XY. 4-D Flow MRI-Based Computational Analysis of Blood Flow in Patient-Specific Aortic Dissection. IEEE Trans Biomed Eng 2019; 66:3411-3419. [DOI: 10.1109/tbme.2019.2904885] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vardakis JC, Bonfanti M, Franzetti G, Guo L, Lassila T, Mitolo M, Hoz de Vila M, Greenwood JP, Maritati G, Chou D, Taylor ZA, Venneri A, Homer-Vanniasinkam S, Balabani S, Frangi AF, Ventikos Y, Diaz-Zuccarini V. Highly integrated workflows for exploring cardiovascular conditions: Exemplars of precision medicine in Alzheimer's disease and aortic dissection. Morphologie 2019; 103:148-160. [PMID: 31786098 DOI: 10.1016/j.morpho.2019.10.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 10/12/2019] [Accepted: 10/16/2019] [Indexed: 12/31/2022]
Abstract
For precision medicine to be implemented through the lens of in silico technology, it is imperative that biophysical research workflows offer insight into treatments that are specific to a particular illness and to a particular subject. The boundaries of precision medicine can be extended using multiscale, biophysics-centred workflows that consider the fundamental underpinnings of the constituents of cells and tissues and their dynamic environments. Utilising numerical techniques that can capture the broad spectrum of biological flows within complex, deformable and permeable organs and tissues is of paramount importance when considering the core prerequisites of any state-of-the-art precision medicine pipeline. In this work, a succinct breakdown of two precision medicine pipelines developed within two Virtual Physiological Human (VPH) projects are given. The first workflow is targeted on the trajectory of Alzheimer's Disease, and caters for novel hypothesis testing through a multicompartmental poroelastic model which is integrated with a high throughput imaging workflow and subject-specific blood flow variability model. The second workflow gives rise to the patient specific exploration of Aortic Dissections via a multi-scale and compliant model, harnessing imaging, computational fluid-dynamics (CFD) and dynamic boundary conditions. Results relating to the first workflow include some core outputs of the multiporoelastic modelling framework, and the representation of peri-arterial swelling and peri-venous drainage solution fields. The latter solution fields were statistically analysed for a cohort of thirty-five subjects (stratified with respect to disease status, gender and activity level). The second workflow allowed for a better understanding of complex aortic dissection cases utilising both a rigid-wall model informed by minimal and clinically common datasets as well as a moving-wall model informed by rich datasets.
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Affiliation(s)
- J C Vardakis
- Centre for Computational Imaging & Simulation Technologies in Biomedicine (CISTIB), School of Computing, University of Leeds, UK.
| | - M Bonfanti
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK; Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - G Franzetti
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - L Guo
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - T Lassila
- Centre for Computational Imaging & Simulation Technologies in Biomedicine (CISTIB), School of Computing, University of Leeds, UK
| | - M Mitolo
- Functional MR Unit, Policlinico S. Orsola e Malpighi, Department of Biomedical and NeuroMotor Sciences (DiBiNeM), Bologna, Italy
| | - M Hoz de Vila
- Centre for Computational Imaging & Simulation Technologies in Biomedicine (CISTIB), School of Computing, University of Leeds, UK
| | - J P Greenwood
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, UK; Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - G Maritati
- Ospedale A. Perrino, Brindisi, Italy; Azienda Ospedaliera San Camillo-Forlanini, Rome, Italy
| | - D Chou
- Department of Mechanical Engineering, National Central University, Taoyuan County, Taiwan
| | - Z A Taylor
- Centre for Computational Imaging & Simulation Technologies in Biomedicine (CISTIB), School of Mechanical Engineering, University of Leeds, UK
| | - A Venneri
- Department of Neuroscience, Medical School, University of Sheffield, UK
| | - S Homer-Vanniasinkam
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK; Leeds Teaching Hospitals NHS Trust, Leeds, UK; University of Warwick Medical School & University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
| | - S Balabani
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - A F Frangi
- Centre for Computational Imaging & Simulation Technologies in Biomedicine (CISTIB), School of Computing, University of Leeds, UK
| | - Y Ventikos
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - V Diaz-Zuccarini
- Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK; Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Department of Medical Physics and Biomedical Engineering, University College London, UK.
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Patient-specific haemodynamic simulations of complex aortic dissections informed by commonly available clinical datasets. Med Eng Phys 2019; 71:45-55. [DOI: 10.1016/j.medengphy.2019.06.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 05/22/2019] [Accepted: 06/09/2019] [Indexed: 12/26/2022]
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Abstract
Background and Objective Ostial LM stenting potentially induces turbulence in the aortic wall near the LM ostium, which might be correlated with aorta dilation and dissection. We investigated through a computational fluid dynamic analysis (CFD), the presence and potential consequences of flow turbulences both in the ascending aorta and arch after a stenting left main (LM) mid shaft or distal disease. Methods The model of the ascending aorta and left coronary artery was reconstructed reviewing both angiographic and echocardiographic measurements of 80 consecutive patients (43 males, mean age 75.1 ± 6.2 years) with significant LM mid shaft or distal disease treated in our institution. For stent simulation, a third-generation everolimus-eluting stent was reconstructed. Two stenting procedures (lesion 1:1 or ostial coverage) were investigated. Results The net area averaged WSS of the model resulted higher when the stent covered the lesion 1:1 compared to the ostial coverage (3.68 vs. 2.06 Pa, P=0.01 and 3.97 vs. 1.98 Pa, P < 0.001, respectively). LM ostial coverage generates more turbulences in the LM itself, in the aortic wall at ostium level, and at the sino-tubular junction compared with the stenting of the lesion 1:1. Conversely, in the ascending aorta, the WSS appears lower when stenting the lesion 1:1. Conclusion Extending the stent coverage up to the ostium, when the ostial region is not diseased, might induce unfavorable alterations of flow; not only both at the level of the LM lesion and ostium sites, but also in the ascending aorta and aortic arch, potentially predisposing the aortic wall to long-term damage.
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DeCampli WM. Commentary: Avoiding the fate of King George II: Are we making progress? J Thorac Cardiovasc Surg 2018; 158:364-365. [PMID: 30578053 DOI: 10.1016/j.jtcvs.2018.11.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 11/09/2018] [Indexed: 10/27/2022]
Affiliation(s)
- William M DeCampli
- Department of Clinical Sciences, College of Medicine, University of Central Florida, Orlando, Fla; Division of Cardiothoracic Surgery, Arnold Palmer Hospital for Children, Orlando, Fla.
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Retrograde type A aortic dissection complicating endovascular therapy of type B aortic dissection and descending thoracic aneurysm disease. Curr Opin Cardiol 2018; 33:581-586. [DOI: 10.1097/hco.0000000000000567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Romarowski RM, Lefieux A, Morganti S, Veneziani A, Auricchio F. Patient-specific CFD modelling in the thoracic aorta with PC-MRI-based boundary conditions: A least-square three-element Windkessel approach. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2018; 34:e3134. [PMID: 30062843 DOI: 10.1002/cnm.3134] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 07/17/2018] [Accepted: 07/17/2018] [Indexed: 06/08/2023]
Abstract
The increasing use of computational fluid dynamics for simulating blood flow in clinics demands the identification of appropriate patient-specific boundary conditions for the customization of the mathematical models. These conditions should ideally be retrieved from measurements. However, finite resolution of devices as well as other practical/ethical reasons prevent the construction of complete data sets necessary to make the mathematical problems well posed. Available data need to be completed by modelling assumptions, whose impact on the final solution has to be carefully addressed. Focusing on aortic vascular districts and related pathologies, we present here a method for efficiently and robustly prescribing phase contrast MRI-based patient-specific data as boundary conditions at the domain of interest. In particular, for the outlets, the basic idea is to obtain pressure conditions from an appropriate elaboration of available flow rates on the basis of a 3D/0D dimensionally heterogeneous modelling. The key point is that the parameters are obtained by a constrained optimization procedure. The rationale is that pressure conditions have a reduced impact on the numerical solution compared with velocity conditions, yielding a simulation framework less exposed to noise and inconsistency of the data, as well as to the arbitrariness of the underlying modelling assumptions. Numerical results confirm the reliability of the approach in comparison with other patient-specific approaches adopted in the literature.
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Affiliation(s)
- Rodrigo M Romarowski
- 3D and Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Adrien Lefieux
- Division of Cardiology, Emory University, Atlanta, Georgia
- Department of Mathematics and Computer Science, Emory University, Atlanta, Georgia
| | - Simone Morganti
- Department of Electrical, Computer, and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Alessandro Veneziani
- Department of Mathematics and Computer Science, Emory University, Atlanta, Georgia
| | - Ferdinando Auricchio
- Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy
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Galla JD. The shea(e)r stress of it all. J Thorac Cardiovasc Surg 2018; 155:2287-2288. [PMID: 29501232 DOI: 10.1016/j.jtcvs.2018.01.065] [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: 12/08/2017] [Accepted: 01/31/2018] [Indexed: 10/18/2022]
Affiliation(s)
- Jan D Galla
- Englewood Cardiac Surgery Associates, Englewood Hospital Medical Center, Englewood, NJ.
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Mylonas SN, Barkans A, Ante M, Wippermann J, Böckler D, Brunkwall JS. Prevalence of Bovine Aortic Arch Variant in Patients with Aortic Dissection and its Implications in the Outcome of Patients with Acute Type B Aortic Dissection. Eur J Vasc Endovasc Surg 2018; 55:385-391. [PMID: 29338980 DOI: 10.1016/j.ejvs.2017.12.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Accepted: 12/01/2017] [Indexed: 12/26/2022]
Abstract
OBJECTIVE/BACKGROUND To investigate the prevalence of bovine arch (BA) among patients with type A and B aortic dissection, and to provide insight into the implication of this variation on the outcome of patients with acute or subacute type B aortic dissection (a/sTBAD). METHODS This retrospective cohort analysis includes patients with a/sTBAD admitted between January 2006 and December 2016. Computed tomographic angiograms (CTAs) of patients referred because of type A aortic dissection were also re-evaluated with regard to the presence of BA. As a control group, 110 oncological patients who had undergone a chest CTA for disease staging during the study period were enrolled. A total of 154 patients with a/sTBAD and 168 with type A aortic dissection were identified during the study period. RESULTS An overall prevalence of 17.6% for BA variants was revealed. The comparison between patients with aortic dissection and the control group showed no statistically significant difference in BA prevalence (17.7% vs. 17.3%; p = 1.0). No statistically significant difference in BA prevalence was observed when comparing patients with type A aortic dissection with those with type B aortic dissection (16.6% vs. 18.8%; p = .66). During a median follow-up period of 27.8 months, 30 patients died. The mortality rate among patients presenting a BA variant was 34.5%, whereas among patients without, it was 16.0% (p = .04). Multivariate analysis revealed the presence of a BA as an independent predictor of mortality (adjusted odds ratio 3.4, 95% confidence interval 1.2-9.8). CONCLUSION The BA should be considered as a predictor of the outcome for patients with type B aortic dissection.
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Affiliation(s)
- Spyridon N Mylonas
- Department of Vascular and Endovascular Surgery, University of Cologne, Cologne, Germany.
| | - Arthurs Barkans
- Department of Vascular and Endovascular Surgery, University of Cologne, Cologne, Germany
| | - Marius Ante
- Department of Vascular and Endovascular Surgery, University of Heidelberg, Heidelberg, Germany
| | - Jens Wippermann
- Department of Cardiac and Thoracic Surgery, University of Cologne, Cologne, Germany
| | - Dietmar Böckler
- Department of Vascular and Endovascular Surgery, University of Heidelberg, Heidelberg, Germany
| | - Jan Sigge Brunkwall
- Department of Vascular and Endovascular Surgery, University of Cologne, Cologne, Germany
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