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Fukushima S, Ohki T, Tachihara H, Shukuzawa K, Ohmori M, Ozawa H, Miyo S, Nakagawa H, Yamada Y, Kasa K. Clinical impact of proximal fixation augmentation using the Najuta thoracic fenestrated stent graft during endovascular treatment for distal aortic arch aneurysm. J Vasc Surg 2024:S0741-5214(24)01108-X. [PMID: 38750942 DOI: 10.1016/j.jvs.2024.04.074] [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: 02/02/2024] [Revised: 03/25/2024] [Accepted: 04/23/2024] [Indexed: 06/11/2024]
Abstract
OBJECTIVE Prevention of late type Ia endoleaks is the main concern in thoracic endovascular aortic aneurysm repair (TEVAR) for thoracic aortic aneurysm. Since 2017, we have performed zone 0 TEVAR with proximal fixation augmentation using a Najuta thoracic fenestrated stent graft in addition to zone 2 TEVAR for distal arch aneurysms. We report the early and midterm outcomes of TEVAR performed using this strategy. METHODS This single-center retrospective study enrolled 386 cases of TEVAR for thoracic aortic disease between January 2013 and December 2020. Patients with thoracic aortic aneurysm treated by TEVAR landing at zone 2 was referred to as the standard group, whereas those treated by TEVAR landing at zone 0 using a Najuta fenestrated stent graft in addition to zone 2 TEVAR was referred to as the augmentation group. We retrospectively compared the clinical outcomes between the two groups. The primary end point was secondary intervention for postoperative type Ia endoleaks. Secondary end points were technical success, aneurysm-related death, and major adverse events (MAEs), including stroke, paraplegia, endoleaks, and secondary interventions. RESULTS We performed TEVAR in 41 and 30 cases in the standard and augmentation groups, respectively. The mean aneurysm sizes in the standard and augmentation groups were 54.5 and 57.3 mm (P = .23), and the proximal neck lengths were 16.8 and 17.4 mm (P = .65), respectively. The anatomical characteristics seemed to be similar in both groups. The technical success rate in both groups was 100%. Three cases in the standard group had MAEs, including two stroke and one brachial artery pseudoaneurysm; whereas two cases had MAEs in the augmentation group, including one stroke and one paraplegia. There was no 30-day mortality or retrograde type A dissection in both groups. The mean observation periods in the standard and augmentation groups were 46 months (range, 1-123 months) and 35 months (range, 1-73 months), respectively. At 36 and 60 months after the procedure, the freedom from aneurysm-related death was 97.6% and 97.6% in the standard group, 100.0% and 100.0% in the augmentation group (P = .39); and the freedom from reintervention for type Ia endoleaks was 79.2% and 65.2% in the standard group, 100.0% and 100.0% in the augmentation group (P = .0087). A statistically significant decrease in reinterventions for type Ia endoleaks was observed in the augmentation group. CONCLUSIONS Proximal fixation augmentation using the Najuta fenestrated stent graft during TEVAR for distal arch aneurysm is effective in preventing the postoperative late type Ia endoleaks.
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Affiliation(s)
- Soichiro Fukushima
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Takao Ohki
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan.
| | - Hiromasa Tachihara
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Kota Shukuzawa
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Makiko Ohmori
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Hirotsugu Ozawa
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Shirouzu Miyo
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Hikaru Nakagawa
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Yuta Yamada
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Kentaro Kasa
- Division of Vascular Surgery, Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
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Skrypnik D, Kalmykov E, Bischoff MS, Meisenbacher K, Klotz R, Hagedorn M, Kalkum E, Probst P, Dammrau R, Böckler D. Late Endograft Migration After Thoracic Endovascular Aortic Repair: A Systematic Review and Meta-analysis. J Endovasc Ther 2024; 31:7-18. [PMID: 35822261 PMCID: PMC10773166 DOI: 10.1177/15266028221109455] [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] [Indexed: 11/17/2022]
Abstract
PURPOSE The objective of this systematic review was to report the cumulative incidence of endograft migration (EM), as well as the morbidity, reintervention rates, and mortality related to EM. This study aimed to provide evidence-based data on patient-relevant sequelae of EM after thoracic endovascular aortic repair (TEVAR) performed using contemporary aortic endografts. MATERIALS AND METHODS A systematic electronic search of literature in MEDLINE (via PubMed), Web of Science, and Cochrane Central Register of Controlled Trials was performed. The pooled synthesis of outcomes was performed using the inverse variance method. RESULTS Seven prospective non-randomized and 4 retrospective studies, including a total of 1783 patients presenting 70 EMs, were considered for the quantitative analysis. The pooled rate of EM was 4% (95% CI, 2%-7%; range, 0.2%-11%; I2=82%); pooled morbidity rate was 31% (95% CI, 12%-59%; range, 0%-100%; I2=64%) and pooled reintervention rate was 32% (95% CI, 15%-56%; range, 0%-100%; I2=55%). The pooled mortality rate due to EM was 5% (95% CI, 1%-21%; range, 0%-40%; I2=24%). CONCLUSION For the first time, this meta-analysis provides pooled reference estimates of EM after TEVAR. Thus, the results hold the potential to further characterize EM after TEVAR. The clinical relevance of EM is underlined by its association with high rates of endoleak-related morbidity, reintervention, and mortality. Close standardized surveillance after TEVAR for early detection of EM and prophylaxis of its sequelae is essential.
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Affiliation(s)
- Denis Skrypnik
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Egan Kalmykov
- Department of Vascular and Endovascular Surgery, University Clinic of Brandenburg/Havel, Brandenburg, Germany
- Department of Vascular and Endovascular Surgery, Helios University Clinic, Wuppertal, Germany
| | - Moritz S. Bischoff
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Katrin Meisenbacher
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Rosa Klotz
- Study Center of the German Society of Surgery, University Heidelberg, Heidelberg, Germany
| | - Matthias Hagedorn
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Eva Kalkum
- Study Center of the German Society of Surgery, University Heidelberg, Heidelberg, Germany
| | - Pascal Probst
- Study Center of the German Society of Surgery, University Heidelberg, Heidelberg, Germany
- Department of Surgery, Cantonal Hospital Thurgau, Frauenfeld, Switzerland
| | - Rolf Dammrau
- Department of Vascular and Endovascular Surgery, Helios University Clinic, Wuppertal, Germany
| | - Dittmar Böckler
- Department of Vascular and Endovascular Surgery, University Hospital Heidelberg, Heidelberg, Germany
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Derycke L, Avril S, Millon A. Patient-Specific Numerical Simulations of Endovascular Procedures in Complex Aortic Pathologies: Review and Clinical Perspectives. J Clin Med 2023; 12:jcm12030766. [PMID: 36769418 PMCID: PMC9917982 DOI: 10.3390/jcm12030766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/13/2023] [Accepted: 01/16/2023] [Indexed: 01/20/2023] Open
Abstract
The endovascular technique is used in the first line treatment in many complex aortic pathologies. Its clinical outcome is mostly determined by the appropriate selection of a stent-graft for a specific patient and the operator's experience. New tools are still needed to assist practitioners with decision making before and during procedures. For this purpose, numerical simulation enables the digital reproduction of an endovascular intervention with various degrees of accuracy. In this review, we introduce the basic principles and discuss the current literature regarding the use of numerical simulation for endovascular management of complex aortic diseases. Further, we give the future direction of everyday clinical applications, showing that numerical simulation is about to revolutionize how we plan and carry out endovascular interventions.
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Affiliation(s)
- Lucie Derycke
- Department of Cardio-Vascular and Vascular Surgery, Hôpital Européen Georges Pompidou, F-75015 Paris, France
- Centre CIS, Mines Saint-Etienne, Université Jean Monnet Saint-Etienne, INSERM, SAINBIOSE U1059, F-42023 Saint-Etienne, France
| | - Stephane Avril
- Centre CIS, Mines Saint-Etienne, Université Jean Monnet Saint-Etienne, INSERM, SAINBIOSE U1059, F-42023 Saint-Etienne, France
| | - Antoine Millon
- Department of Vascular and Endovascular Surgery, Hospices Civils de Lyon, Louis Pradel University Hospital, F-69500 Bron, France
- Correspondence:
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Deshpande AA, Pandey NN, Shaw M, Kumar S, Jagia P, Sharma S, Choudhary S. Stent-Graft Migration Post-Endovascular Repair of Thoracic Aorta: A Retrospective Cohort Study. Indian J Radiol Imaging 2022; 32:324-331. [PMID: 36177280 PMCID: PMC9514910 DOI: 10.1055/s-0042-1754317] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Abstract
Background Migration of the stent-graft post-thoracic endovascular aortic repair (TEVAR) is not uncommon; however, it is sparsely reported. The objective of this study was to assess the incidence, risk factors, and complications of stent-graft migration post-TEVAR.
Materials and Methods Thirty-one patients who underwent TEVAR were retrospectively analyzed. The demographic, anatomical, and procedure-related factors were assessed. The measurements were done along the greater curvature of aorta around two fixed anatomic landmarks, that is, left common carotid artery or neoinnominate artery (hybrid repair) proximally and celiac artery distally. Aortic elongation and migration at proximal, distal, as well as at overlapping zone were measured. More than 10 mm of migration was considered significant.
Results Significant migration was observed in six (19%) patients. No significant migration was observed in the overlapping zone. The proximal landing zone 3 (odds ratio [OR] 12.78, p 0.01) was a significant risk factor, whereas landing zone 2 was a protective factor against the migration (OR 0.08, p 0.02). The odds for migration were more in segments I/3 and II/3 compared with I/2 and II/2, respectively, as per Modified Arch Landing Areas Nomenclature. A single complication was seen in the migration group which was treated by an overlapping stent graft.
Conclusion The stent-graft migration after TEVAR is not uncommon. Type 3 proximal landing zone was a significant risk factor for migration with an increased risk toward I/3 and II/3. Proximal landing zone 2 as well as adequate overlapping distance in multiple stent grafts can prevent migration.
Ethical Approval No IECPG-227/24.06.2020
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Affiliation(s)
- Amit Ajit Deshpande
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Niraj Nirmal Pandey
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Manish Shaw
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Sanjeev Kumar
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Priya Jagia
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Sanjiv Sharma
- Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India
| | - Shiv Choudhary
- Department of Cardiothoracic and Vascular Surgery, All India Institute of Medical Sciences, New Delhi, India
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5
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Saitta S, Sturla F, Caimi A, Riva A, Palumbo MC, Nano G, Votta E, Corte AD, Glauber M, Chiappino D, Marrocco-Trischitta MM, Redaelli A. A Deep Learning-Based and Fully Automated Pipeline for Thoracic Aorta Geometric Analysis and Planning for Endovascular Repair from Computed Tomography. J Digit Imaging 2022; 35:226-239. [PMID: 35083618 PMCID: PMC8921448 DOI: 10.1007/s10278-021-00535-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 10/08/2021] [Accepted: 11/05/2021] [Indexed: 10/19/2022] Open
Abstract
Feasibility assessment and planning of thoracic endovascular aortic repair (TEVAR) require computed tomography (CT)-based analysis of geometric aortic features to identify adequate landing zones (LZs) for endograft deployment. However, no consensus exists on how to take the necessary measurements from CT image data. We trained and applied a fully automated pipeline embedding a convolutional neural network (CNN), which feeds on 3D CT images to automatically segment the thoracic aorta, detects proximal landing zones (PLZs), and quantifies geometric features that are relevant for TEVAR planning. For 465 CT scans, the thoracic aorta and pulmonary arteries were manually segmented; 395 randomly selected scans with the corresponding ground truth segmentations were used to train a CNN with a 3D U-Net architecture. The remaining 70 scans were used for testing. The trained CNN was embedded within computational geometry processing pipeline which provides aortic metrics of interest for TEVAR planning. The resulting metrics included aortic arch centerline radius of curvature, proximal landing zones (PLZs) maximum diameters, angulation, and tortuosity. These parameters were statistically analyzed to compare standard arches vs. arches with a common origin of the innominate and left carotid artery (CILCA). The trained CNN yielded a mean Dice score of 0.95 and was able to generalize to 9 pathological cases of thoracic aortic aneurysm, providing accurate segmentations. CILCA arches were characterized by significantly greater angulation (p = 0.015) and tortuosity (p = 0.048) in PLZ 3 vs. standard arches. For both arch configurations, comparisons among PLZs revealed statistically significant differences in maximum zone diameters (p < 0.0001), angulation (p < 0.0001), and tortuosity (p < 0.0001). Our tool allows clinicians to obtain objective and repeatable PLZs mapping, and a range of automatically derived complex aortic metrics.
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Affiliation(s)
- Simone Saitta
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
| | - Francesco Sturla
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
- 3D and Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Alessandro Caimi
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
| | - Alessandra Riva
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
- 3D and Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Maria Chiara Palumbo
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
| | - Giovanni Nano
- Clinical Research Unit and Division of Vascular Surgery, IRCCS Policlinico San Donato, Via Morandi 30, 20097, San Donato Milanese, Italy
| | - Emiliano Votta
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
- 3D and Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Alessandro Della Corte
- Department of Translational Medical Sciences, University of Campania "L. Vanvitelli", Unit of Cardiac Surgery, V. Monaldi Hospital, Naples, Italy
| | - Mattia Glauber
- Minimally Invasive Cardiac Surgery Unit, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Dante Chiappino
- Department of Radiology, CNR (National Council of Research), Tuscany Region 'Gabriele Monasterio' Foundation (FTGM), Massa, Italy
| | - Massimiliano M Marrocco-Trischitta
- Clinical Research Unit and Division of Vascular Surgery, IRCCS Policlinico San Donato, Via Morandi 30, 20097, San Donato Milanese, Italy.
| | - Alberto Redaelli
- Department of Electronics Information and Bioengineering, Politecnico Di Milano, Milan, Italy
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Avril S, Gee MW, Hemmler A, Rugonyi S. Patient-specific computational modeling of endovascular aneurysm repair: State of the art and future directions. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2021; 37:e3529. [PMID: 34490740 DOI: 10.1002/cnm.3529] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
Endovascular aortic repair (EVAR) has become the preferred intervention option for aortic aneurysms and dissections. This is because EVAR is much less invasive than the alternative open surgery repair. While in-hospital mortality rates are smaller for EVAR than open repair (1%-2% vs. 3%-5%), the early benefits of EVAR are lost after 3 years due to larger rates of complications in the EVAR group. Clinicians follow instructions for use (IFU) when possible, but are left with personal experience on how to best proceed and what choices to make with respect to stent-graft (SG) model choice, sizing, procedural options, and their implications on long-term outcomes. Computational modeling of SG deployment in EVAR and tissue remodeling after intervention offers an alternative way of testing SG designs in silico, in a personalized way before intervention, to ultimately select the strategies leading to better outcomes. Further, computational modeling can be used in the optimal design of SGs in cases of complex geometries. In this review, we address some of the difficulties and successes associated with computational modeling of EVAR procedures. There is still work to be done in all areas of EVAR in silico modeling, including model validation, before models can be applied in the clinic, but much progress has already been made. Critical to clinical implementation are current efforts focusing on developing fast algorithms that can achieve (near) real-time solutions, as well as ways of dealing with inherent uncertainties related to patient aortic wall degradation on an individualized basis. We are optimistic that EVAR modeling in the clinic will soon become a reality to help clinicians optimize EVAR interventions and ultimately reduce EVAR-associated complications.
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Affiliation(s)
- Stéphane Avril
- Mines Saint-Étienne, Univ Lyon, Univ Jean Monnet, INSERM, Saint-Étienne, France
| | - Michael W Gee
- Mechanics & High Performance Computing Group, Department of Mechanical Engineering, Technical University of Munich, Garching, Germany
| | - André Hemmler
- Mechanics & High Performance Computing Group, Department of Mechanical Engineering, Technical University of Munich, Garching, Germany
| | - Sandra Rugonyi
- Biomedical Engineering Department, Oregon Health & Science University, Portland, Oregon, USA
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Domanin M, Bissacco D, Romarowsky RM, Conti M, Auricchio F, Ferraresi M, Trimarchi S. Drag Forces after Thoracic Endovascular Aortic Repair. General Review of the Literature. Ann Vasc Surg 2021; 75:479-488. [PMID: 33823255 DOI: 10.1016/j.avsg.2021.02.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 02/16/2021] [Accepted: 02/22/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Despite the great evolution of endograft devices for thoracic endovascular aortic repair (TEVAR), threatening related complication such as graft migration and endoleaks still occur during follow up. The Drag Forces (DF), that is the displacement forces that play a role in graft migration and endoleaks caused by the blood flow against the thoracic graft, can be studied by means of Computational Fluid Dynamics (CFD). METHOD A general review of papers found in current literature was performed. CFD studies available on the topic of thoracic aortic diseases and DF were analyzed. All anatomic, hemodynamics or graft related factors which could have an impact on DF were reported. RESULTS Different factors deeply influence DF magnitude in the different site of the Ishimaru's zones classification: angulation, tortuosity and length of the landing zone, graft diameter, length and deployment position, blood pressure, pulse waveform, blood viscosity and patient heart rate have been related to the magnitude of DF. Moreover, also the three-dimensional orientation of DF is emerging as a fundamental issue from CFD studies. DF can be divided in sideways and upward components. The former, even of higher magnitude in zone 0, maintain always an orthogonal orientation and does not change in any type of aortic arch; the latter result strictly related to the anatomic complexity of the aortic arch with values up to four times higher in zone 3. CONCLUSION Different DF magnitude and orientation could explain how TEVAR have higher rate of migration and endoleaks when we face with more complex aortic anatomies. All these aspects should be foreseen during the planning of TEVAR procedure. In this field, collaboration between physicians and engineers is crucial, as both parts have a primary role in understanding and describing hidden aspects involved in TEVAR procedures.
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Affiliation(s)
- Maurizio Domanin
- Department of Health and Community Sciences, University of Milan, Milan, Italy; Fondazione IRCCS Ca' Grande Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Daniele Bissacco
- Fondazione IRCCS Ca' Grande Ospedale Maggiore Policlinico Milano, Milan, Italy
| | - Rodrigo M Romarowsky
- Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy
| | - Michele Conti
- Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy
| | - Ferdinando Auricchio
- Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy
| | - Marco Ferraresi
- Teaching School of Vascular Surgery, Vascular Surgery Resident Program University of Milan, Italy
| | - Santi Trimarchi
- Department of Health and Community Sciences, University of Milan, Milan, Italy; Fondazione IRCCS Ca' Grande Ospedale Maggiore Policlinico Milano, Milan, Italy.
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8
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Mei Y, Xu H, Ma W, Li Z, Yang R, Yuan H, Peng Y, Wu M, Chen Z, Guo W, Gao T, Xiong J, Chen D. Retrograde branched extension limb assembling stent of pararenal abdominal aortic aneurysm: A longitudinal hemodynamic analysis for stent graft migration. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2020; 36:e3394. [PMID: 32790046 DOI: 10.1002/cnm.3394] [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: 08/14/2019] [Revised: 03/31/2020] [Accepted: 08/02/2020] [Indexed: 06/11/2023]
Abstract
PURPOSE Pararenal abdominal aortic aneurysms (PRAAAs) are a life-threatening disease, and hemodynamic analysis may provide greater insight into the effectiveness and long-term outcomes of endovascular aneurysm repair (EVAR). However, the lack of patient-specific boundary conditions on the periphery compromises the accuracy. Windkessel (WK) boundary conditions coupled to hemodynamic follow-up models of a PRAAA patient, aims to provide insights into the link between hemodynamics and poor prognosis. METHOD One PRAAA patient underwent EVAR and reintervention after one branch of stent-graft (SG) had migrated. Totally five computational follow-up models were studied. Patient-specific flow data acquired via ultrasound were used to define the boundary conditions in the ascending aorta and the following three branches. Coupled zero-dimensional WK models representing the distal vasculature were used to define the outlet boundary conditions under the abdomen. RESULTS Flow divisions of the main SG branches were 40.7% and 24.7%, respectively. Time-averaged wall shear stress and oscillatory shear index (OSI) increased at the junction connected the SG branch and the stent leading to the right common iliac artery (RCIA) where the stent migrated. The OSI and relative residence time (RRT) value in superior mesenteric artery increased notably after the migration, the RRT continuously increased following the reintervention. CONCLUSION Unbalanced flow, resulting in locally high-speed flow, high WSS and OSI might significantly affect stent stability. Results suggest that diameters and interconnection design of stents in complex cases should take the flow division into consideration and computational simulations might be considered as a tool for intervention protocol design.
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Affiliation(s)
- Yuqian Mei
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Huanming Xu
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Wei Ma
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Zhenfeng Li
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Rui Yang
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
| | - Hai Yuan
- Department of Vascular Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Yan Peng
- Beijing CapitalBio Technology Corporation, Beijing, China
| | - Muyang Wu
- Department of Health Science Newark, University of Delaware, Newark, Delaware, USA
| | - Zhangtao Chen
- Department of Biomedical Engineering, Pennsylvania State University, State College, Pennsylvania, USA
| | - Wei Guo
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
| | - Tianxin Gao
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Jiang Xiong
- Department of Vascular and Endovascular Surgery, Chinese PLA General Hospital, Beijing, China
| | - Duanduan Chen
- School of Life Science, Beijing Institute of Technology, Beijing, China
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9
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Shi W, Li H, Zhu T, Jin Y, Wang H, Yang J, Zhao D. Study on the bending behavior of biodegradable metal cerebral vascular stents using finite element analysis. J Biomech 2020; 108:109856. [PMID: 32635992 DOI: 10.1016/j.jbiomech.2020.109856] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 01/01/2020] [Accepted: 05/21/2020] [Indexed: 11/25/2022]
Abstract
Excellent bending behavior is evaluated as the primary factor during the design of biodegradable metal cerebral vascular stents (BMCVSs), which enables vascular stents to be successfully delivered to the targeted location and avoids unnecessary damage to blood vessels. Unfortunately, this bending behavior has been barely investigated which limits the design of BMCVSs with optimal structures. Herein, six BMCVSs were designed and their bending process were simulated using finite element analysis (FEA). Then, the effects of the stent bridge connection type and structure on the bending behavior were systematically analyzed and an universal mathematical model was further established, in which the influence of the structure parameters of the stent bridge on the flexibility of stents was considered. After that, the bending mechanism of the high-stress zone of the bridge was investigated. Finally, the causes and effects of the self-contacting phenomenon as well as the inner-stent protrusion phenomenon in the bending state were analyzed theoretically, and corresponding solutions were proposed to optimize the design of stents. The numerical results show that the stents with the dislocation-line W-shaped unit have better flexibility than the other stents. The flexibility is positively correlated to the cube of the length of linear part and to the square of the curvature of curved part. The self-contacting phenomenon of the bridge during bending can constrain the formation of inner-stent protrusion, which can eliminate the negative effects of the implanted stents on the hemodynamics in blood vessels. This study is expected to provide practical guidance for the structural design of BMCVSs for clinical applications.
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Affiliation(s)
- Weiliang Shi
- Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116023, China
| | - Hongxia Li
- Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116023, China
| | - Tingzhun Zhu
- Department of Neurosurgery, The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116023, China
| | - Yifei Jin
- Department of Mechanical Engineering, University of Nevada Reno, Reno, NV 89557, USA
| | - Hairui Wang
- Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116023, China
| | - Jianbing Yang
- Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116023, China
| | - Danyang Zhao
- Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116023, China.
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10
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Marrocco-Trischitta MM, de Beaufort HW, Piffaretti G, Bonardelli S, Gargiulo M, Antonello M, van Herwaarden JA, Boveri S, Bellosta R, Trimarchi S, Castelli P, Gallitto E, Macchi E, Mazzeo G, Saviane G, Secchi F, Spampinato B, Xodo A. The Modified Arch Landing Areas Nomenclature predicts proximal endograft failure after thoracic endovascular aortic repair. Eur J Cardiothorac Surg 2020; 58:309-318. [DOI: 10.1093/ejcts/ezaa115] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/18/2020] [Accepted: 02/27/2020] [Indexed: 11/13/2022] Open
Abstract
Abstract
OBJECTIVES
Our goal was to assess the value of the Modified Arch Landing Areas Nomenclature (MALAN) for thoracic endovascular aortic repair (TEVAR), in which each landing area (LA) is identified by a proximal landing zone and the type of arch (e.g. 0/I), as predictors of postoperative proximal endograft performance.
METHODS
A multicentre retrospective analysis was performed of patients treated with arch TEVAR (i.e. proximal landing zone 0–3) for various indications between 2007 and 2017. Patients were stratified by the MALAN classification into hostile LAs (i.e. 2/III and 3/III) and favourable LAs (i.e. 0/I–III, 1/I–III, 2/I–II and 3/I–II). Outcome criteria included composite proximal endograft failure (including type Ia endoleak, persistent false lumen perfusion at the level of the most proximal communication between the lumina in aortic dissections, endograft migration and retrograde dissection) and deaths from all causes. Competing risk analyses were performed.
RESULTS
A total of 359 patients (hostile LAs 133; favourable LAs 226) were identified. The median age was 71.0 (62.0–77.0); 78.3% were men. Proximal endograft failure occurred in 28/133 patients (21.1%) in the hostile LA group and in 12/226 (5.3%) in the favourable LA group. On multivariate analysis, hostile LAs were independently associated with proximal endograft failure (P < 0.0001). There was no other independent risk factor. Favourable LAs were associated with an increased mortality rate (P = 0.006), which could be attributed to the proximal LA subgroup (i.e. 0/I–III and 1/I–III) (P < 0.0001), in addition to age (P < 0.0001).
CONCLUSIONS
The MALAN classification identifies hostile proximal landing zones for TEVAR, namely 2/III and 3/III LAs, which are associated with dismal proximal endograft performance. The MALAN appears to be an intuitive and valuable tool to improve the preoperative decision-making process.
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Affiliation(s)
| | - Hector W de Beaufort
- Clinical Research Unit and Division of Vascular Surgery, IRCCS Policlinico San Donato, San Donato Milanese, Italy
- Department of Vascular Surgery, University Medical Center Utrecht, Utrecht, Netherlands
| | - Gabriele Piffaretti
- Vascular Surgery, Department of Surgery and Morphological Sciences, Circolo University Teaching Hospital, University of Insubria School of Medicine, Varese, Italy
| | - Stefano Bonardelli
- Department of Vascular Surgery, A.O Spedali Civili di Brescia, University of Brescia, Brescia, Italy
| | - Mauro Gargiulo
- Vascular Surgery, DIMES, Policlinico Sant’Orsola-Malpighi, University of Bologna, Bologna, Italy
| | - Michele Antonello
- Vascular and Endovascular Surgery Division, Padua University, School of Medicine, Padua, Italy
| | | | - Sara Boveri
- Scientific Directorate, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
| | - Raffaello Bellosta
- Vascular Surgery Unit, Cardiovascular Surgery Department, Poliambulanza Foundation Hospital, Brescia, Italy
| | - Santi Trimarchi
- Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Clinical and Community Sciences, University of Milan, Milan, Italy
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Hemmler A, Lin A, Thierfelder N, Franz T, Gee MW, Bezuidenhout D. Customized stent-grafts for endovascular aneurysm repair with challenging necks: A numerical proof of concept. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2020; 36:e3316. [PMID: 32022404 DOI: 10.1002/cnm.3316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 12/05/2019] [Accepted: 01/23/2020] [Indexed: 06/10/2023]
Abstract
Endovascular aortic repair (EVAR) is a challenging intervention whose long-term success strongly depends on the appropriate stent-graft (SG) selection and sizing. Most off-the-shelf SGs are straight and cylindrical. Especially in challenging vessel morphologies, the morphology of off-the-shelf SGs is not able to meet the patient-specific demands. Advanced manufacturing technologies facilitate the development of highly customized SGs. Customized SGs that have the same morphology as the luminal vessel surface could considerably improve the quality of the EVAR outcome with reduced likelihoods of EVAR related complications such as endoleaks type I and SG migration. In this contribution, we use an in silico EVAR methodology that approximates the deployed state of the elastically deformable SG in a hyperelastic, anisotropic vessel. The in silico EVAR results of off-the-shelf SGs and customized SGs are compared qualitatively and quantitatively in terms of mechanical and geometrical parameters such as stent stresses, contact tractions, SG fixation forces and the SG-vessel attachment. In a numerical proof of concept, eight different vessel morphologies, such as a conical vessel, a barrel shaped vessel and a curved vessel, are used to demonstrate the added value of customized SGs compared to off-the-shelf SGs. The numerical investigation has shown large benefits of the highly customized SGs compared to off-the-shelf SGs with respect to a better SG-vessel attachment and a considerable increase in SG fixation forces of up to 50% which indicate decreased likelihoods of EVAR related complications. Hence, this numerical proof of concept motivates further research and development of highly customized SGs for the use in challenging vessel morphologies.
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Affiliation(s)
- André Hemmler
- Mechanics & High Performance Computing Group, Technische Universität München, Garching bei München, Germany
| | - Andrew Lin
- Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town, Observatory, South Africa
| | - Nikolaus Thierfelder
- Herzchirurgische Klinik und Poliklinik, Ludwig-Maximilians-Universität München, München, Germany
| | - Thomas Franz
- Division of Biomedical Engineering, Department of Human Biology, University of Cape Town, Observatory, South Africa
| | - Michael W Gee
- Mechanics & High Performance Computing Group, Technische Universität München, Garching bei München, Germany
| | - Deon Bezuidenhout
- Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town, Observatory, South Africa
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Marrocco-Trischitta MM, Alaidroos M, Romarowski RM, Secchi F, Righini P, Glauber M, Nano G. Geometric Pattern of Proximal Landing Zones for Thoracic Endovascular Aortic Repair in the Bovine Arch Variant. Eur J Vasc Endovasc Surg 2019; 59:808-816. [PMID: 31889656 DOI: 10.1016/j.ejvs.2019.11.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 10/14/2019] [Accepted: 11/12/2019] [Indexed: 01/09/2023]
Abstract
OBJECTIVE The aim was to investigate whether the "bovine" aortic arch (i.e. arch variant with a common origin of the innominate and left carotid artery (CILCA)) is associated with a consistent geometric configuration of proximal landing zones for thoracic endovascular aortic repair (TEVAR). METHODS Anonymised thoracic computed tomography (CT) scans of healthy aortas were reviewed to retrieve 100 cases of CILCA. Suitable cases were stratified according to type 1 and 2 CILCA, and also based on type of arch (I, II, and III). Further processing allowed calculation of angulation and tortuosity of the proximal landing zones. Centre lumen line lengths of each proximal landing zone were measured in a view perpendicular to the centre line. All geometric features were compared with those measured in healthy patients with a standard arch configuration (n = 60). Two senior authors independently evaluated the CT scans, and intra- and interobserver repeatability were assessed. RESULTS The 100 selected patients (63% male) were 71.4 ± 7.7 years old. Type 1 CILCA (62/100) was more prevalent than type 2 CILCA (38/100), and the two groups were comparable in age (p = .11). Zone 3 presented a severe angulation (i.e. > 60°), which was greater than in Zone 2 (p < .001), and a consistently greater tortuosity than Zone 2 (p = .003). This pattern did not differ between type 1 and type 2 CILCA. A greater tortuosity was also observed in Zone 0, which was related to increased elongation of the ascending aorta (i.e. Zone 0), than the standard configuration. The CILCA had an overall greater elongation, and Zone 2 also was specifically longer. When stratifying by type of arch, reversely from Type III to Type I, the CILCA presented a gradual flattening of its transverse tract, which entailed a consistent progressive elongation (p = .03) and kinking of the ascending aorta, with a significant increase of Zone 0 angulation to even a severe degree (p = .001). Also, from Type III to Type I, Zone 2 presented a progressively shorter length (p = .004), which was associated with increased tortuosity (p < .05). Mean intra- and interobserver differences for angulation measurements were 1.4° ± 6.8° (p = .17) and 2.0° ± 10.1° (p = .19), respectively. CONCLUSION CILCA presents a consistent and peculiar geometric pattern compared with standard arch configuration, which provides relevant information for TEVAR planning, and may have prognostic implications.
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Affiliation(s)
- Massimiliano M Marrocco-Trischitta
- Clinical Research Unit, IRCCS - Policlinico San Donato, Milan, Italy; Vascular Surgery Unit, IRCCS - Policlinico San Donato, Milan, Italy.
| | - Moad Alaidroos
- Clinical Research Unit, IRCCS - Policlinico San Donato, Milan, Italy; Vascular Surgery Unit, Policlinico San Marco, Zingonia, Italy
| | - Rodrigo M Romarowski
- 3D and Computer Simulation Laboratory, IRCCS - Policlinico San Donato, Milan, Italy
| | - Francesco Secchi
- Division of Radiology, IRCCS - Policlinico San Donato, Milan, Italy; Department of "Scienze Biomediche per la Salute", University of Milan, Italy
| | - Paolo Righini
- Vascular Surgery Unit, IRCCS - Policlinico San Donato, Milan, Italy
| | - Mattia Glauber
- Minimally Invasive Cardiac Surgery Unit, Istituto Clinico Sant'Ambrogio, Milan, Italy
| | - Giovanni Nano
- Vascular Surgery Unit, IRCCS - Policlinico San Donato, Milan, Italy; Department of "Scienze Biomediche per la Salute", University of Milan, Italy
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13
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Hemmler A, Lutz B, Reeps C, Gee MW. In silico study of vessel and stent-graft parameters on the potential success of endovascular aneurysm repair. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2019; 35:e3237. [PMID: 31315160 DOI: 10.1002/cnm.3237] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 05/29/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
The variety of stent-graft (SG) design variables (eg, SG type and degree of SG oversizing) and the complexity of decision making whether a patient is suitable for endovascular aneurysm repair (EVAR) raise the need for the development of predictive tools to assist clinicians in the preinterventional planning phase. Recently, some in silico EVAR methods have been developed to predict the deployed SG configuration. However, only few studies investigated how to assess the in silico EVAR outcome with respect to EVAR complication likelihoods (eg, endoleaks and SG migration). Based on a large literature study, in this contribution, 20 mechanical and geometrical parameters (eg, SG drag force and SG fixation force) are defined to evaluate the quality of the in silico EVAR outcome. For a cohort of n = 146 realizations of parameterized vessel and SG geometries, the in silico EVAR results are studied with respect to these mechanical and geometrical parameters. All degrees of SG oversizing in the range between 5% and 40% are investigated continuously by a computationally efficient parameter continuation approach. The in silico investigations have shown that the mechanical and geometrical parameters are able to indicate candidates at high risk of postinterventional complications. Hence, this study provides the basis for the development of a simulation-based metric to assess the potential success of EVAR based on engineering parameters.
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Affiliation(s)
- André Hemmler
- Mechanics & High Performance Computing Group, Technische Universität München, Parkring 35, Garching b. München, 85748, Germany
| | - Brigitta Lutz
- Klinik für Viszeral-, Thorax- und Gefäßchirurgie, Universitätsklinikum Carl Gustav Carus Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Christian Reeps
- Klinik für Viszeral-, Thorax- und Gefäßchirurgie, Universitätsklinikum Carl Gustav Carus Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Michael W Gee
- Mechanics & High Performance Computing Group, Technische Universität München, Parkring 35, Garching b. München, 85748, Germany
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Gaudric J, Politi MT, Fernández JM, Carre E, Capurro C, Fullana JM. Calculation of the aortic arch angles from three-dimensional reconstructions of computed tomography scans: Comparison between an automated program and visual assessment. Comput Biol Med 2019; 114:103440. [DOI: 10.1016/j.compbiomed.2019.103440] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 09/06/2019] [Accepted: 09/07/2019] [Indexed: 10/26/2022]
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Houben IB, van Bakel TMJ, Patel HJ. Type B intramural hematoma: thoracic endovascular aortic repair (TEVAR) or conservative approach? Ann Cardiothorac Surg 2019; 8:483-487. [PMID: 31463210 DOI: 10.21037/acs.2019.05.18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ignas B Houben
- Department of Cardiac Surgery, Frankel Cardiovascular Center, University of Michigan Health Center, Ann Arbor, MI, USA
| | - Theodorus M J van Bakel
- Department of Cardiac Surgery, Frankel Cardiovascular Center, University of Michigan Health Center, Ann Arbor, MI, USA
| | - Himanshu J Patel
- Department of Cardiac Surgery, Frankel Cardiovascular Center, University of Michigan Health Center, Ann Arbor, MI, USA
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Marrocco-Trischitta MM, Spampinato B, Mazzeo G, Mazzaccaro D, Milani V, Alaidroos M, Ambrogi F, Nano G. Impact of the Bird-Beak Configuration on Postoperative Outcome After Thoracic Endovascular Aortic Repair: A Meta-analysis. J Endovasc Ther 2019; 26:771-778. [DOI: 10.1177/1526602819865906] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Purpose: To investigate the association between the bird-beak configuration (BBC), a wedge-shaped gap between the undersurface of a thoracic endograft and the lesser curvature of the arch after thoracic endovascular aortic repair (TEVAR), and postoperative outcome after TEVAR. Methods: The study was performed according to the PRISMA guidelines. The PubMed, EMBASE, and Cochrane databases were searched to identify all case series reporting BBC after TEVAR between 2006 and April 2018. Data analysis was performed considering the difference in the risk of complications for presence vs absence of BBC. After screening 1633 articles, 21 studies were identified that matched the selection criteria; 12 of these reported detailed information to investigate the postoperative outcome using proportion meta-analysis with a random effects model. The pooled risk difference is reported with the 95% confidence interval (CI). Heterogeneity of the included studies was assessed with the I2 statistic (low 25%, medium 50%, high 75%). Results: Complications occurred within a range of 0 to 72 months in 14.7% (95% CI 7.4% to 27.3%) of patients with BBC and in 6.3% (95% CI 2.5% to 15.4%) of patients without BBC. A cumulative incidence could not be assessed. The summary risk difference was 11.1% (95% CI −0.1% to 22.3%, p=0.052). There was significant heterogeneity ( I2=85.6%). The Egger test did not show evidence of publication bias (p=0.975). When specifically considering type Ia endoleak and endograft migration, the risk difference between BBC and non-BBC patients was 8.2% (95% CI 0.3% to 16.1%, p=0.042; I2=69.0%). The specific risk difference for endograft collapse/infolding and thrombosis was 3.7% (95% CI −3.5% to 11.1%, p=0.308; I2=10.2%). Conclusion: At present the literature does not provide statistical evidence to establish an overall prognostic value of the BBC. Nevertheless, the BBC appears to be associated with a high risk of type Ia endoleak and endograft migration, which warrants specific and long-term surveillance. Clinically relevant values for BBC grading should be established to perhaps define indications for preemptive treatment based on the presence of BBC only.
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Affiliation(s)
- Massimiliano M. Marrocco-Trischitta
- Clinical Research Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
- Vascular Surgery Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
| | - Benedetta Spampinato
- Vascular Surgery Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
- Residency Program in Vascular Surgery, University of Milan, Italy
| | - Girolomina Mazzeo
- Vascular Surgery Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
- Residency Program in Vascular Surgery, University of Milan, Italy
| | - Daniela Mazzaccaro
- Vascular Surgery Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
| | - Valentina Milani
- Biostatistics Service, IRCCS Policlinico San Donato, Milan Italy
| | - Moad Alaidroos
- Vascular Surgery Unit, Policlinico San Marco, Zingonia, Italy
| | - Federico Ambrogi
- Biostatistics Service, IRCCS Policlinico San Donato, Milan Italy
- Laboratory of Medical Statistics, University of Milan, Italy
| | - Giovanni Nano
- Vascular Surgery Unit, Cardiovascular Department, IRCCS Policlinico San Donato, Milan, Italy
- Department of “Scienze Biomediche per la Salute,” University of Milan, Italy
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Endograft migration after thoracic endovascular aortic repair. J Vasc Surg 2019; 69:1387-1394. [DOI: 10.1016/j.jvs.2018.07.073] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 07/27/2018] [Indexed: 11/20/2022]
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Patient-specific in silico endovascular repair of abdominal aortic aneurysms: application and validation. Biomech Model Mechanobiol 2019; 18:983-1004. [PMID: 30834463 DOI: 10.1007/s10237-019-01125-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 02/05/2019] [Indexed: 10/27/2022]
Abstract
Non-negligible postinterventional complication rates after endovascular aneurysm repair (EVAR) leave room for further improvements. Since the potential success of EVAR depends on various patient-specific factors, such as the complexity of the vessel geometry and the physiological state of the vessel, in silico models can be a valuable tool in the preinterventional planning phase. A suitable in silico EVAR methodology applied to patient-specific cases can be used to predict stent-graft (SG)-related complications, such as SG migration, endoleaks or tissue remodeling-induced aortic neck dilatation and to improve the selection and sizing process of SGs. In this contribution, we apply an in silico EVAR methodology that predicts the final state of the deployed SG after intervention to three clinical cases. A novel qualitative and quantitative validation methodology, that is based on a comparison between in silico results and postinterventional CT data, is presented. The validation methodology compares average stent diameters pseudo-continuously along the total length of the deployed SG. The validation of the in silico results shows very good agreement proving the potential of using in silico approaches in the preinterventional planning of EVAR. We consider models of bifurcated, marketed SGs as well as sophisticated models of patient-specific vessels that include intraluminal thrombus, calcifications and an anisotropic model for the vessel wall. We exemplarily show the additional benefit and applicability of in silico EVAR approaches to clinical cases by evaluating mechanical quantities with the potential to assess the quality of SG fixation and sealing such as contact tractions between SG and vessel as well as SG-induced tissue overstresses.
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Auricchio F, Conti M, Romarowski RM, de Beaufort HW, Grassi V, Trimarchi S. Computational tools for thoracic endovascular aortic repair planning. ITALIAN JOURNAL OF VASCULAR AND ENDOVASCULAR SURGERY 2019. [DOI: 10.23736/s1824-4777.18.01386-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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The Modified Arch Landing Areas Nomenclature identifies hostile zones for endograft deployment: a confirmatory biomechanical study in patients treated by thoracic endovascular aortic repair†. Eur J Cardiothorac Surg 2018; 55:990-997. [DOI: 10.1093/ejcts/ezy409] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 10/22/2018] [Accepted: 10/23/2018] [Indexed: 12/20/2022] Open
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Computational simulation of TEVAR in the ascending aorta for optimal endograft selection: A patient-specific case study. Comput Biol Med 2018; 103:140-147. [DOI: 10.1016/j.compbiomed.2018.10.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/14/2018] [Accepted: 10/14/2018] [Indexed: 01/16/2023]
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van Bakel TMJ, Figueroa CA, van Herwaarden JA, Trimarchi S. Commentary: Challenges of Thoracic Endovascular Aortic Repair for Type B Aortic Dissection. J Endovasc Ther 2018; 25:578-580. [DOI: 10.1177/1526602818795153] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Theodorus M. J. van Bakel
- Department of Surgery, University of Michigan, Ann Arbor, MI, USA
- Department of Vascular Surgery, University Medical Center Utrecht, the Netherlands
- Policlinico San Donato IRCCS, Thoracic Aortic Research Center, San Donato Milanese, Italy
| | - C. Alberto Figueroa
- Department of Surgery, University of Michigan, Ann Arbor, MI, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | | | - Santi Trimarchi
- Policlinico San Donato IRCCS, Thoracic Aortic Research Center, San Donato Milanese, Italy
- Department of Biomedical Sciences for Health, University of Milan, Italy
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Hemmler A, Lutz B, Reeps C, Kalender G, Gee MW. A methodology for in silico endovascular repair of abdominal aortic aneurysms. Biomech Model Mechanobiol 2018; 17:1139-1164. [PMID: 29752606 DOI: 10.1007/s10237-018-1020-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 04/23/2018] [Indexed: 11/29/2022]
Abstract
Endovascular aneurysm repair (EVAR) can involve some unfavorable complications such as endoleaks or stent-graft (SG) migration. Such complications, resulting from the complex mechanical interaction of vascular tissue, SG and blood flow or incompatibility of SG design and vessel geometry, are difficult to predict. Computational vascular mechanics models can be a predictive tool for the selection, sizing and placement process of SGs depending on the patient-specific vessel geometry and hence reduce the risk of potential complications after EVAR. In this contribution, we present a new in silico EVAR methodology to predict the final state of the deployed SG after intervention and evaluate the mechanical state of vessel and SG, such as contact forces and wall stresses. A novel method to account for residual strains and stresses in SGs, resulting from the precompression of stents during the assembly process of SGs, is presented. We suggest a parameter continuation approach to model various different sizes of SGs within one in silico EVAR simulation which can be a valuable tool when investigating the issue of SG oversizing. The applicability and robustness of the proposed methods are demonstrated on the example of a synthetic abdominal aortic aneurysm geometry.
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Affiliation(s)
- André Hemmler
- Mechanics and High Performance Computing Group, Technische Universität München, Parkring 35, 85748, Garching b. München, Germany
| | - Brigitta Lutz
- Klinik für Viszeral-, Thorax- und Gefäßchirurgie, Universitätsklinikum Carl Gustav Carus Dresden, Fetscherstraße 74, 01307, Dresden, Germany
| | - Christian Reeps
- Klinik für Viszeral-, Thorax- und Gefäßchirurgie, Universitätsklinikum Carl Gustav Carus Dresden, Fetscherstraße 74, 01307, Dresden, Germany
| | - Günay Kalender
- Klinik für vaskuläre und endovaskuläre Chirurgie, DRK Kliniken Berlin, Salvador-Allende-Straße 2-8, 12559, Berlin, Germany
| | - Michael W Gee
- Mechanics and High Performance Computing Group, Technische Universität München, Parkring 35, 85748, Garching b. München, Germany.
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The Modified Arch Landing Areas Nomenclature (MALAN) Improves Prediction of Stent Graft Displacement Forces: Proof of Concept by Computational Fluid Dynamics Modelling. Eur J Vasc Endovasc Surg 2018; 55:584-592. [DOI: 10.1016/j.ejvs.2017.12.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 12/18/2017] [Indexed: 01/07/2023]
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Aortic Anatomy and Complications of the Proximal Sealing Zone after Endovascular Treatment of the Thoracic Aorta. Ann Vasc Surg 2018; 48:141-150. [DOI: 10.1016/j.avsg.2017.09.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 07/25/2017] [Accepted: 09/01/2017] [Indexed: 11/21/2022]
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Takahashi A, Zhu X, Aoyama Y, Umezu M, Iwasaki K. Three-Dimensional Strain Measurements of a Tubular Elastic Model Using Tomographic Particle Image Velocimetry. Cardiovasc Eng Technol 2018; 9:395-404. [PMID: 29560585 DOI: 10.1007/s13239-018-0350-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 03/15/2018] [Indexed: 11/24/2022]
Abstract
The evaluation of strain induced in a blood vessel owing to contact with a medical device is of significance to examine the causes leading to vascular injury and rupture. The development of a method to assess strain in largely deformed elastic materials is expected. This study's scope was to measure strain in deformed tubular elastic mock vessels using tomographic particle image velocimetry (tomo-PIV), and to show the applicability of this measurement method by comparing the results with data derived from a finite element analysis (FEA). Strain distribution was calculated from the displacement distribution, which in turn was measured by tracking fluorescent 13 μm particles in a transparent tubular elastic model using tomo-PIV. The von Mises strain distribution was calculated for a model whose inner diameter was subjected to a pressure load, because of which it expanded from 25 to 27.5 mm, adjusting to the diameter change of a human aorta during heartbeat. An FEA simulating the experiment was also conducted. Three-dimensional strain was successfully measured by using the tomo-PIV method. The radial strain distribution in the model linearly decreased outward (from the its inner to its outer side), and the result was consistent with the data obtained from the FEA. The mean von Mises strain measured using tomo-PIV was comparable with that obtained from the FEA (tomo-PIV: 0.155, FEA: 0.156). This study demonstrates the feasibility of utilizing tomo-PIV to quantitatively assess the three-dimensional strain induced in largely deformed elastic models.
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Affiliation(s)
- Azuma Takahashi
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
| | - Xiaodong Zhu
- Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo, Japan
| | - Yusuke Aoyama
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
| | - Mitsuo Umezu
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan.,Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo, Japan.,Cooperative Major in Advanced Biomedical Sciences, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
| | - Kiyotaka Iwasaki
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan. .,Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo, Japan. .,Cooperative Major in Advanced Biomedical Sciences, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan. .,, 2-2 Wakamatsu-cho, Shinjuku, Tokyo, 162-8480, Japan.
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Zhu Y, Wang F, Deng X. Hemodynamics of cerebral bridging veins connecting the superior sagittal sinus based on numerical simulation. Biomed Eng Online 2018; 17:35. [PMID: 29558949 PMCID: PMC5861626 DOI: 10.1186/s12938-018-0466-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/07/2018] [Indexed: 01/23/2023] Open
Abstract
Background The physiological and hemodynamic features of bridging veins involve wall shear stress (WSS) of the cerebral venous system. Based on the data of cadavers and computational fluid dynamics software pack, the hemodynamic physical models of bridging veins (BVs) connecting superior sagittal sinus (SSS) were established. Results A total of 137 BVs formed two clusters along the SSS: anterior group and posterior group. The diameters of the BVs in posterior group were larger than of the anterior group, and the entry angle was smaller. When the diameter of a BV was greater than 1.2 mm, the WSS decreased in the downstream wall of SSS with entry angle less than 105°, and the WSS also decreased in the upstream wall of BVs with entry angle less than 65°. The minimum WSS in BVs was only 63% of that in SSS. Compared with the BVs in anterior group, the minimum WSS in the posterior group was smaller, and the distance from location of the minimum WSS to the dural entrance was longer. Conclusion The cerebral venous thrombosis occurs more easily when the diameter of a BV is greater than 1.2 mm and the entry angle is less than 65°. The embolus maybe form earlier in the upstream wall of BVs in the posterior part of SSS. Electronic supplementary material The online version of this article (10.1186/s12938-018-0466-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Youyu Zhu
- Department of Anatomy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, China
| | - Feng Wang
- Department of Anatomy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, China
| | - Xuefei Deng
- Department of Anatomy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, China.
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Takahashi A, Suzuki S, Aoyama Y, Umezu M, Iwasaki K. A three-dimensional strain measurement method in elastic transparent materials using tomographic particle image velocimetry. PLoS One 2017; 12:e0184782. [PMID: 28910397 PMCID: PMC5599044 DOI: 10.1371/journal.pone.0184782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 08/30/2017] [Indexed: 11/17/2022] Open
Abstract
Background The mechanical interaction between blood vessels and medical devices can induce strains in these vessels. Measuring and understanding these strains is necessary to identify the causes of vascular complications. This study develops a method to measure the three-dimensional (3D) distribution of strain using tomographic particle image velocimetry (Tomo-PIV) and compares the measurement accuracy with the gauge strain in tensile tests. Methods and findings The test system for measuring 3D strain distribution consists of two cameras, a laser, a universal testing machine, an acrylic chamber with a glycerol water solution for adjusting the refractive index with the silicone, and dumbbell-shaped specimens mixed with fluorescent tracer particles. 3D images of the particles were reconstructed from 2D images using a multiplicative algebraic reconstruction technique (MART) and motion tracking enhancement. Distributions of the 3D displacements were calculated using a digital volume correlation. To evaluate the accuracy of the measurement method in terms of particle density and interrogation voxel size, the gauge strain and one of the two cameras for Tomo-PIV were used as a video-extensometer in the tensile test. The results show that the optimal particle density and interrogation voxel size are 0.014 particles per pixel and 40 × 40 × 40 voxels with a 75% overlap. The maximum measurement error was maintained at less than 2.5% in the 4-mm-wide region of the specimen. Conclusions We successfully developed a method to experimentally measure 3D strain distribution in an elastic silicone material using Tomo-PIV and fluorescent particles. To the best of our knowledge, this is the first report that applies Tomo-PIV to investigate 3D strain measurements in elastic materials with large deformation and validates the measurement accuracy.
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Affiliation(s)
- Azuma Takahashi
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
| | - Sara Suzuki
- Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
| | - Yusuke Aoyama
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
| | - Mitsuo Umezu
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan.,Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
| | - Kiyotaka Iwasaki
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan.,Cooperative Major in Advanced Biomedical Sciences, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
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Marrocco-Trischitta MM, de Beaufort HW, Secchi F, van Bakel TM, Ranucci M, van Herwaarden JA, Moll FL, Trimarchi S. A geometric reappraisal of proximal landing zones for thoracic endovascular aortic repair according to aortic arch types. J Vasc Surg 2017; 65:1584-1590. [DOI: 10.1016/j.jvs.2016.10.113] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 10/30/2016] [Indexed: 01/16/2023]
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Gindre J, Bel-Brunon A, Rochette M, Lucas A, Kaladji A, Haigron P, Combescure A. Patient-Specific Finite-Element Simulation of the Insertion of Guidewire During an EVAR Procedure: Guidewire Position Prediction Validation on 28 Cases. IEEE Trans Biomed Eng 2017; 64:1057-1066. [DOI: 10.1109/tbme.2016.2587362] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Roy D, Lerouge S, Inaekyan K, Kauffmann C, Mongrain R, Soulez G. Experimental validation of more realistic computer models for stent-graft repair of abdominal aortic aneurysms, including pre-load assessment. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2016; 32:e02769. [PMID: 26748474 DOI: 10.1002/cnm.2769] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 12/30/2015] [Accepted: 01/04/2016] [Indexed: 06/05/2023]
Abstract
Although the endovascular repair of abdominal aortic aneurysms is a less invasive alternative than classic open surgery, complications such as endoleak and kinking still need to be addressed. Numerical simulation of endovascular repair is becoming a valuable tool in stent-graft (SG) optimization, patient selection and surgical planning. The experimental and numerical forces required to produce SG deformations were compared in a range of in vivo conditions in the present study. The deformation modes investigated were: bending as well as axial, transversal and radial compressions. In particular, an original method was developed to efficiently account for radial pre-load because of the pre-compression of stents to match the graft dimensions during manufacturing. This is important in order to compute the radial force exerted on the vessel after deployment more accurately. Variations of displacement between the experimental and numerical results ranged from 1.39% for simple leg bending to 5.93% for three-point body bending. Finally, radial pre-load was modeled by increasing Young's modulus of each stent. On average, it was found that Young's modulus had to be augmented by a factor of 2. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- David Roy
- Centre de Recherche, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada, H2X 0A9
- Biomedical Engineering Institute, Université de Montréal, Montréal, Québec, Canada, H3T 1J4
| | - Sophie Lerouge
- Centre de Recherche, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada, H2X 0A9
- Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Québec, Canada, H3C 1K3
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada, H3C 3J7
| | - Karina Inaekyan
- Department of Mechanical Engineering, École de Technologie Supérieure, Montréal, Québec, Canada, H3C 1K3
| | - Claude Kauffmann
- Centre de Recherche, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada, H2X 0A9
| | - Rosaire Mongrain
- Department of Mechanical Engineering, McGill University, Montréal, Québec, Canada, H3A 0C3
| | - Gilles Soulez
- Centre de Recherche, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada, H2X 0A9
- Biomedical Engineering Institute, Université de Montréal, Montréal, Québec, Canada, H3T 1J4
- Department of Radiology, Radio-Oncology and Nuclear Medicine, Université de Montréal, Montréal, Québec, Canada, H3C 3J7
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Kotha VK, Herget EJ, Appoo JJ. Complications at the Proximal Landing Zone of Endovascular Stent Grafts Deployed in Surgically Replaced Ascending Aorta. Ann Thorac Surg 2016; 102:1490-1497. [DOI: 10.1016/j.athoracsur.2016.04.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 02/29/2016] [Accepted: 04/11/2016] [Indexed: 10/21/2022]
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