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Stahl J, Marsh LMM, Thormann M, Ding A, Saalfeld S, Behme D, Berg P. Assessment of the flow-diverter efficacy for intracranial aneurysm treatment considering pre- and post-interventional hemodynamics. Comput Biol Med 2023; 156:106720. [PMID: 36878124 DOI: 10.1016/j.compbiomed.2023.106720] [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: 12/23/2022] [Revised: 02/08/2023] [Accepted: 02/26/2023] [Indexed: 03/02/2023]
Abstract
Endovascular treatment of intracranial aneurysms with flow diverters (FD) has become one of the most promising interventions. Due to its woven high-density structure they are particularly applicable for challenging lesions. Although several studies have already conducted realistic hemodynamic quantification of the FD efficacy, a comparison with morphologic post-interventional data is still missing. This study analyses the hemodynamics of ten intracranial aneurysm patients treated with a novel FD device. Based on pre- and post-interventional 3D digital subtraction angiography image data, patient-specific 3D models of both treatment states are generated applying open source threshold-based segmentation methods. Using a fast virtual stenting approach, the real stent positions available in the post-interventional data are virtually replicated and both treatment scenarios were characterized using image-based blood flow simulations. The results show FD-induced flow reductions at the ostium by a decrease in mean neck flow rate (51%), inflow concentration index (56%) and mean inflow velocity (53%). Intraluminal reductions in flow activity for time-averaged wall shear stress (47%) and kinetic energy (71%) are present as well. However, an intra-aneurysmal increase in flow pulsatility (16%) for the post-interventional cases can be observed. Patient-specific FD simulations demonstrate the desired flow redirection and activity reduction inside the aneurysm beneficial for thrombosis formation. Differences in the magnitude of hemodynamic reduction exist over the cardiac cycle which may be addressed in a clinical setting by anti-hypertensive treatment in selected cases.
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Affiliation(s)
- Janneck Stahl
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, 39106, Germany.
| | | | - Maximilian Thormann
- University Clinic for Neuroradiology, University Hospital Magdeburg, Magdeburg, 39120, Germany
| | | | - Sylvia Saalfeld
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Simulation and Graphics, University of Magdeburg, Magdeburg, 39106, Germany
| | - Daniel Behme
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; University Clinic for Neuroradiology, University Hospital Magdeburg, Magdeburg, 39120, Germany
| | - Philipp Berg
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Medical Engineering, University of Magdeburg, Magdeburg, 39106, Germany
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2
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Cagnazzo F, Fanti A, Lefevre PH, Derraz I, Dargazanli C, Gascou G, Riquelme C, Ahmed R, Bonafe A, Costalat V. Distal anterior cerebral artery aneurysms treated with flow diversion: experience of a large-volume center and systematic review of the literature. J Neurointerv Surg 2020; 13:42-48. [PMID: 32457222 DOI: 10.1136/neurintsurg-2020-015980] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/22/2020] [Accepted: 04/27/2020] [Indexed: 11/03/2022]
Abstract
BACKGROUND Evidence about the safety and the efficacy of flow diversion for distal anterior cerebral artery (DACA) aneurysms is scant. To provide further insight into flow diversion for aneurysms located at, or distal to, the A2 segment. METHODS Consecutive patients receiving flow diversion for DACA aneurysms were retrieved from our prospective database (2014-2020). A PRISMA guidelines-based systematic review of the literature was performed. Aneurysm occlusion (O'Kelly-Marotta=OKM) and clinical outcomes were evaluated. RESULTS Twenty-three patients and 25 unruptured saccular DACA aneurysms treated with flow diversion were included. Aneurysm size ranged from 2 mm to 9 mm (mean size 4.5 mm, SD ±1.6). Mean parent artery diameter was 1.8 mm (range, 1.2-3 mm, SD ±0.39). Successful stent deployment was achieved in all cases. Angiographic adequate occlusion (OKM C-D) at follow-up (14 months) was 79% (19/24 available aneurysms). No cases of aneurysm rupture or retreatment were reported. Univariate analysis showed a significant difference in diameter among aneurysms with adequate (4 mm) vs incomplete occlusion (7 mm) (P=0.006).There was one transient perioperative in-stent thrombosis, and three major events causing neurological morbidity: two stent thromboses (one attributable to the non-adherence of the patient to the antiplatelet therapy); and one acute occlusion of a covered calloso-marginal artery.Results from systematic review (12 studies and 107 A2-A3 aneurysms) showed 78.6% (95% CI=70-86) adequate occlusion, 7.5% (95% CI=3.6-14) complications, and 2.8%, (3/107, 95% CI=0.6-8.2) morbidity. CONCLUSIONS Flow diversion among DACA aneurysms is effective, especially among small lesions. However, potential morbidity related to in-stent thrombosis and covered side branches should be considered when planning this strategy.
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Affiliation(s)
- Federico Cagnazzo
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Andrea Fanti
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Pierre-Henri Lefevre
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Imad Derraz
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Cyril Dargazanli
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Gregory Gascou
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Carlos Riquelme
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Raed Ahmed
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Alain Bonafe
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Vincent Costalat
- Neuroradiology, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
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Cagnazzo F, Ahmed R, Lefevre PH, Derraz I, Dargazanli C, Gascou G, Riquelme C, Frandon J, Bonafe A, Costalat V. Flow modification on the internal carotid artery bifurcation region and A1 segment after M1-internal carotid artery flow diverter deployment. J Neurointerv Surg 2020; 12:1226-1230. [PMID: 32457221 DOI: 10.1136/neurintsurg-2020-016051] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/17/2020] [Accepted: 04/21/2020] [Indexed: 11/03/2022]
Abstract
BACKGROUND Clinical and hemodynamic consequences of flow diverters extending from the M1 to the internal carotid artery (ICA), covering the A1 segment, have rarely been investigated. We aimed to provide angiographic and clinical data about flow modifications on the covered A1. METHODS Consecutive patients receiving M1-ICA flow diverters for unruptured aneurysms were collected from our prospective database (2014-2020). RESULTS 42 A1 arteries covered with a single device were studied. All patients had an angiographic detected contralateral flow from the anterior communicating artery (AcomA). Immediately after flow diversion, 20 (47.6%) covered A1 showed slow flow. During a mean angiographic follow-up of 14 months, 13 (31%) and 22 (52.3%) A1 arteries were occluded and narrowed, respectively. Flow changes were asymptomatic in all cases. Vascular risk factors, sex, oversized compared with not oversized stents, immediate A1 slow flow, age, diameter of the A1, length of follow-up, and platelet inhibition rate were tested as prognosticators of A1 occlusion. Length of the angiographic follow-up was the only predictor of A1 occlusion (p=0.005, OR=3, CI=1.4 to 6.7). There were two device related ischemic events with a 2.3% rate of morbidity (one basal ganglia infarct after coverage of the M1 perforators and one transient acute instent thrombosis). CONCLUSIONS Covering the A1 segment during M1-ICA flow diversion seems relatively safe, if the contralateral flow is assured by the AcomA. Approximately 31% and 52% of the covered A1 showed asymptomatic occlusions and narrowing, respectively. The likelihood of flow modification was proportional to the length of follow-up. Morbidity associated with flow diversion in the ICA terminus region was 2.3%.
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Affiliation(s)
- Federico Cagnazzo
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Raed Ahmed
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Pierre-Henri Lefevre
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Imad Derraz
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Cyril Dargazanli
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Gregory Gascou
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Carlos Riquelme
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Julien Frandon
- Radiologie et Imagerie Médicale, Hôpital Universitaire Carémeau, Nîmes, Nîmes, France
| | - Alain Bonafe
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
| | - Vincent Costalat
- Neuroradiology Department, Centre Hospitalier Regional Universitaire de Montpellier, Montpellier, Languedoc-Roussillon, France
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Iosif C. Neurovascular devices for the treatment of intracranial aneurysms: emerging and future technologies. Expert Rev Med Devices 2020; 17:173-188. [PMID: 32141395 DOI: 10.1080/17434440.2020.1733409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Introduction: Despite numerous advances in the endovascular treatment of intracranial aneurysms (IAs), treatment in cases of wide-neck, complex configurations or branching locations remains challenging. Apart from the paradigm shift introduced by flow diverters, several other devices have seen the light or are under development in order to address these challenges.Areas covered: We performed a review of the novel implantable endovascular devices which have been introduced for the treatment of IAs, from 1 January 2014 to 1 September 2019, excluding classic flow diverter and intracranial stent designs.Expert opinion: Alternative designs have been proposed for the treatment of IAs at branching positions, which do not jail the side branches, with or without flow diversion effect, most of which with good initial outcomes. Endosaccular devices have also been proposed, some of which with lower initial total occlusion rates. Alternative materials such as biopolymers have also been proposed and are under bench research. Despite the challenges in the exploitation of some of the new devices, most of them seem to provide solutions to some current technical shortcomings. The exploitation of the biological phenomena and the physical properties of the devices will allow us to expand the therapeutic armamentarium for more complex IA cases.
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Affiliation(s)
- Christina Iosif
- School of Medicine, European University of Cyprus, Nicosia, Cyprus.,Department of Interventional Neuroradiology, Henry Dunant Hospital, Athens, Greece.,Department of Interventional Neuroradiology, Iaso Hospital, Athens, Greece
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5
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Narata AP, Moura F, Larrabide I, Chapot R, Cognard C, Januel AC, Velasco S, Bouakaz A, Patat F, Marzo A. Role of distal cerebral vasculature in vessel constriction after aneurysm treatment with flow diverter stents. J Neurointerv Surg 2020; 12:818-826. [PMID: 31900352 DOI: 10.1136/neurintsurg-2019-015447] [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: 09/13/2019] [Revised: 12/04/2019] [Accepted: 12/04/2019] [Indexed: 11/03/2022]
Abstract
BACKGROUND Treatment of intracranial aneurysms with flow diverter stent (FDS) procedures can lead to caliber changes of jailed vessels. The reason some branches remain unchanged and others are affected by narrowing remains unknown. OBJECTIVE To investigate the influence of resistance to flow from distal vasculature on stent-induced hemodynamic modifications affecting bifurcating vessels. MATERIALS AND METHODS Radiological images and demographic data were acquired for 142 aneurysms treated with a FDS. Vascular resistance was estimated from patient-specific anatomic data. Correlation analysis was used to identify correspondence between anatomic data and clinical outcome. Computational Fluid Dynamics was performed on a typical patient-specific model to evaluate the influence of FDS on flow. Relevant hemodynamic variables along the bifurcating vessels were quantitatively analyzed and validated with in vitro data obtained using power Doppler ultrasound. RESULTS Statistical analysis showed a correlation between clinical outcome and FDS resistance to flow considering overall jailed vessel vascular resistance (r=0.5, P<0.001). Computational predictions of blood flow showed that hemodynamics is minimally affected by FDS treatment in the ophthalmic artery. CONCLUSIONS Jailed vessels are affected by narrowing when resistance to flow from the FDS constitutes a larger proportion of the overall vessel resistance to flow. This knowledge may contribute to better understanding of intracranial hemodynamics after a FDS procedure and reinforce indications for flow diversion in the treatment of intracranial aneurysms.
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Affiliation(s)
- Ana Paula Narata
- Department of Neuroradiology, University Hospital of Tours, Tours, France
| | - Fernando Moura
- Federal University of the ABC Engineering Modeling and Applied Social Sciences Center Sao Bernardo do Campo, Sao Bernardo do Campo, Brazil
| | - Ignacio Larrabide
- PLADEMA-CONICET, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
| | - René Chapot
- Department of Neurointerventional Therapy, Krupp Krankenhaus, Germany, Essen, Germany
| | - Christophe Cognard
- Department of Diagnostic and Therapeutic Neuroradiology, Hôpital Purpan, Toulouse, France
| | | | - Stéphane Velasco
- Department of Radiology, CHU de Poitiers, Poitiers, Vienne, France
| | - Ayache Bouakaz
- Department of Neuroradiology, University Hospital of Tours, Tours, France
| | - Frederic Patat
- Department of Neuroradiology, University Hospital of Tours, Tours, France
| | - Alberto Marzo
- Department of Mechanical Engineering, Insigneo Institute for in silico medicine, The University of Sheffield, Sheffield, UK
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6
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Acuna A, Berman AG, Damen FW, Meyers BA, Adelsperger AR, Bayer KC, Brindise MC, Bungart B, Kiel AM, Morrison RA, Muskat JC, Wasilczuk KM, Wen Y, Zhang J, Zito P, Goergen CJ. Computational Fluid Dynamics of Vascular Disease in Animal Models. J Biomech Eng 2019; 140:2676341. [PMID: 29570754 DOI: 10.1115/1.4039678] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Indexed: 12/19/2022]
Abstract
Recent applications of computational fluid dynamics (CFD) applied to the cardiovascular system have demonstrated its power in investigating the impact of hemodynamics on disease initiation, progression, and treatment outcomes. Flow metrics such as pressure distributions, wall shear stresses (WSS), and blood velocity profiles can be quantified to provide insight into observed pathologies, assist with surgical planning, or even predict disease progression. While numerous studies have performed simulations on clinical human patient data, it often lacks prediagnosis information and can be subject to large intersubject variability, limiting the generalizability of findings. Thus, animal models are often used to identify and manipulate specific factors contributing to vascular disease because they provide a more controlled environment. In this review, we explore the use of CFD in animal models in recent studies to investigate the initiating mechanisms, progression, and intervention effects of various vascular diseases. The first section provides a brief overview of the CFD theory and tools that are commonly used to study blood flow. The following sections are separated by anatomical region, with the abdominal, thoracic, and cerebral areas specifically highlighted. We discuss the associated benefits and obstacles to performing CFD modeling in each location. Finally, we highlight animal CFD studies focusing on common surgical treatments, including arteriovenous fistulas (AVF) and pulmonary artery grafts. The studies included in this review demonstrate the value of combining CFD with animal imaging and should encourage further research to optimize and expand upon these techniques for the study of vascular disease.
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Affiliation(s)
- Andrea Acuna
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Alycia G Berman
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Frederick W Damen
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Brett A Meyers
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907 e-mail:
| | - Amelia R Adelsperger
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Kelsey C Bayer
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Melissa C Brindise
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907 e-mail:
| | - Brittani Bungart
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Alexander M Kiel
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Rachel A Morrison
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Joseph C Muskat
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Kelsey M Wasilczuk
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Yi Wen
- Department of Agricultural and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, IN 47907 e-mail:
| | - Jiacheng Zhang
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907 e-mail:
| | - Patrick Zito
- Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
| | - Craig J Goergen
- ASME Membership Bioengineering Division, Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Drive, West Lafayette, IN 47907 e-mail:
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7
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Multiple Aneurysms AnaTomy CHallenge 2018 (MATCH): Phase I: Segmentation. Cardiovasc Eng Technol 2018; 9:565-581. [DOI: 10.1007/s13239-018-00376-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
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8
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Berg P, Saalfeld S, Janiga G, Brina O, Cancelliere NM, Machi P, Pereira VM. Virtual stenting of intracranial aneurysms: A pilot study for the prediction of treatment success based on hemodynamic simulations. Int J Artif Organs 2018; 41:698-705. [PMID: 29783867 DOI: 10.1177/0391398818775521] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Endovascular treatment of intracranial aneurysms using flow-diverting devices has revolutionized the treatment of large and complex lesions due to its minimally invasive nature and potential clinical outcomes. However, incomplete or delayed occlusion and persistent intracranial aneurysm growth are still an issue for up to one-third of the patients. We evaluated two patients with intracranial aneurysm located at the internal carotid artery who were treated with flow-diverting devices and had opposite outcomes. Both patients presented with similar aneurysms and were treated with the same device, but after a 1-year follow-up, one case presented with complete occlusion (Case 1) and the other required further treatment (Case 2). To reproduce the interventions, virtual stents were deployed and blood flow simulations were carried out using the respective patient-specific geometries. Afterward, hemodynamic metrics such as aneurysmal inflow reduction, wall shear stresses, oscillatory shear, and inflow concentration indices were quantified. The hemodynamic simulations reveal that for both cases, the neck inflow was clearly reduced due to the therapy (Case 1: 19%, Case 2: 35%). In addition, relevant hemodynamic parameters such as time-averaged wall shear stress (Case 1: 35.6%, Case 2: 57%) and oscillatory shear (Case 1: 33.1%, Case 2: 26.7%) were decreased considerably. However, although stronger relative reductions occurred in the unsuccessful case, the absolute flow values in the successful case were approximately halved. The findings demonstrate that a high relative effect of endovascular devices is not necessarily associated with the desired treatment outcome. Instead, it appears that a successful intracranial aneurysm therapy requires a certain patient-specific inflow threshold.
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Affiliation(s)
- Philipp Berg
- 1 Department of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, Germany.,2 Forschungscampus STIMULATE, Magdeburg, Germany
| | - Sylvia Saalfeld
- 2 Forschungscampus STIMULATE, Magdeburg, Germany.,3 Department of Simulation and Graphics, University of Magdeburg, Magdeburg, Germany
| | - Gábor Janiga
- 1 Department of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, Germany.,2 Forschungscampus STIMULATE, Magdeburg, Germany
| | - Olivier Brina
- 4 Interventional Neuroradiology Unit, University Hospital of Geneva, Geneva, Switzerland
| | - Nicole M Cancelliere
- 5 Joint Department of Medical Imaging, Toronto Western Hospital, University Health Network, Toronto, ON, Canada
| | - Paolo Machi
- 4 Interventional Neuroradiology Unit, University Hospital of Geneva, Geneva, Switzerland
| | - Vitor M Pereira
- 5 Joint Department of Medical Imaging, Toronto Western Hospital, University Health Network, Toronto, ON, Canada.,6 Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, Toronto, ON, Canada
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Ban SP, Kwon OK, Lee SU, Bang JS, Oh CW, Jeong HJ, Cho MJ, Jeong EA, Kim T. Long-Term Outcomes of Patients with Stent Tips Embedded into Internal Carotid Artery Branches during Aneurysm Coiling. AJNR Am J Neuroradiol 2018. [PMID: 29519788 DOI: 10.3174/ajnr.a5583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE During stent-assisted coiling of ICA aneurysms, stent tips are sometimes unintentionally embedded into ICA branches. Stent tips can be visualized because they have radiopaque markers. Concerns regarding stent tip misplacement include risks of artery perforation and occlusion. The aim of this study was to evaluate the long-term outcomes of ICA branches with embedded stent tips. MATERIALS AND METHODS ICA branches with embedded stent tips were identified among 35 patients with unruptured ICA aneurysms treated with stent-assisted coiling between November 2003 and November 2014. Patient clinical and angiographic outcomes associated with the embedded stent tip were analyzed. RESULTS Most of the 35 studied aneurysms were paraclinoid ICA aneurysms (n = 30). The most commonly involved ICA branch was the posterior communicating artery (26 patients, 74.3%), followed by the anterior choroidal artery (8 patients, 22.9%) and ophthalmic artery (1 patient, 2.9%). During the follow-up period (38.6 ± 17.9 months), no new neurologic deficits developed. Neither hemorrhagic nor thromboembolic events occurred. Angiography was performed during the final follow-up evaluation at a mean of 32.7 ± 18.0 months, and all ICA branches with embedded stent tips showed patent blood flow without severe luminal narrowing. CONCLUSIONS In our experience, placement of a stent tip into ICA branches during stent-assisted coiling was not associated with any major adverse events.
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Affiliation(s)
- S P Ban
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - O-K Kwon
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - S U Lee
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - J S Bang
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - C W Oh
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - H J Jeong
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - M J Cho
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - E-A Jeong
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - T Kim
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea.
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10
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Narata AP, de Moura FS, Larrabide I, Perrault CM, Patat F, Bibi R, Velasco S, Januel AC, Cognard C, Chapot R, Bouakaz A, Sennoga CA, Marzo A. The Role of Hemodynamics in Intracranial Bifurcation Arteries after Aneurysm Treatment with Flow-Diverter Stents. AJNR Am J Neuroradiol 2018; 39:323-330. [PMID: 29170270 DOI: 10.3174/ajnr.a5471] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 10/02/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Treatment of intracranial bifurcation aneurysms with flow-diverter stents can lead to caliber changes of the distal vessels in a subacute phase. This study aims to evaluate whether local anatomy and flow disruption induced by flow-diverter stents are associated with vessel caliber changes in intracranial bifurcations. MATERIALS AND METHODS Radiologic images and demographic data were acquired for 25 patients with bifurcation aneurysms treated with flow-diverter stents. Whisker plots and Mann-Whitney rank sum tests were used to evaluate if anatomic data and caliber changes could be linked. Symmetry/asymmetry were defined as diameter ratio 1 = symmetric and diameter ratio <1 = asymmetric. Computational fluid dynamics was performed on idealized and patient-specific anatomies to evaluate flow changes induced by flow-diverter stents in the jailed vessel. RESULTS Statistical analysis identified a marked correspondence between asymmetric bifurcation and caliber change. Symmetry ratios were lower for cases showing narrowing or subacute occlusion (medium daughter vessel diameter ratio = 0.59) compared with cases with posttreatment caliber conservation (medium daughter vessel diameter ratio = 0.95). Computational fluid dynamics analysis in idealized and patient-specific anatomies showed that wall shear stress in the jailed vessel was more affected when flow-diverter stents were deployed in asymmetric bifurcations (diameter ratio <0.65) and less affected when deployed in symmetric anatomies (diameter ratio ∼1.00). CONCLUSIONS Anatomic data analysis showed statistically significant correspondence between caliber changes and bifurcation asymmetry characterized by diameter ratio <0.7 (P < .001). Similarly, computational fluid dynamics results showed the highest impact on hemodynamics when flow-diverter stents are deployed in asymmetric bifurcations (diameter ratio <0.65) with noticeable changes on wall sheer stress fields. Further research and clinical validation are necessary to identify all elements involved in vessel caliber changes after flow-diverter stent procedures.
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Affiliation(s)
- A P Narata
- From the University Hospital of Tours (A.P.N., R.B.), Tours, France
| | - F S de Moura
- Engineering, Modeling, and Applied Social Sciences Center (F.S.d.M.), Federal University of ABC, Santo André, Brazil
| | - I Larrabide
- PLADEMA-CONICET (I.L.), Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
| | - C M Perrault
- Mechanical Engineering Department, INSIGNEO Institute for in Silico Medicine (C.M.P., A.M.), University of Sheffield, Sheffield, United Kingdom
| | - F Patat
- UMR "Imagerie et Cerveau," Inserm U930 (F.P., A.B., C.A.S.), Université Francois Rabelais, Tours, France
| | - R Bibi
- From the University Hospital of Tours (A.P.N., R.B.), Tours, France
| | - S Velasco
- University Hospital of Poitiers (S.V.), Poitiers, France
| | - A-C Januel
- University Hospital of Toulouse (A.-C.J., C.C.), Toulouse, France
| | - C Cognard
- University Hospital of Toulouse (A.-C.J., C.C.), Toulouse, France
| | - R Chapot
- Alfried Krupp Krankenhaus (R.C.), Essen, Germany
| | - A Bouakaz
- UMR "Imagerie et Cerveau," Inserm U930 (F.P., A.B., C.A.S.), Université Francois Rabelais, Tours, France
| | - C A Sennoga
- UMR "Imagerie et Cerveau," Inserm U930 (F.P., A.B., C.A.S.), Université Francois Rabelais, Tours, France
| | - A Marzo
- Mechanical Engineering Department, INSIGNEO Institute for in Silico Medicine (C.M.P., A.M.), University of Sheffield, Sheffield, United Kingdom
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Flow diversion: what can clinicians learn from animal models? Neuroradiology 2017; 59:255-261. [DOI: 10.1007/s00234-016-1781-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 12/29/2016] [Indexed: 10/20/2022]
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Iosif C, Mounayer C, Yavuz K, Saleme S, Geyik S, Cekirge HS, Saatci I. Middle Cerebral Artery Bifurcation Aneurysms Treated by Extrasaccular Flow Diverters: Midterm Angiographic Evolution and Clinical Outcome. AJNR Am J Neuroradiol 2017; 38:310-316. [PMID: 27979794 DOI: 10.3174/ajnr.a5022] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 09/15/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND PURPOSE Flow diverters have been increasingly used lately in off-label, distal intracranial aneurysm treatments. Our aim was to evaluate the effectiveness of flow diverters in the treatment of middle cerebral artery bifurcation aneurysms and to analyze midterm angiographic patterns of regional flow modifications for safety and clinical outcomes. MATERIALS AND METHODS Consecutive patients treated from January 2010 to December 2014 by the authors by using endovascular flow-diverting stents for MCA bifurcation aneurysms were evaluated retrospectively with prospectively maintained data. All patients had been followed for at least 12 months after treatment, with at least 2 control angiograms; regional flow-related angiographic modifications were registered by using a new angiographic outcome scale for flow diverters. Data were analyzed with emphasis on procedure-related events, angiographic results, and clinical outcome. RESULTS Fifty-eight patients were included in the study, with 63 MCA bifurcation aneurysms; 13 of these were large and giant. Pretreatment mRS was 0 for 12 patients (20.7%), 1 for 41 (70.7%), and 2 for 5 patients (8.6%). Six-month control revealed mRS 0-2 for 57 (98.3%) patients and 3 for 1 (1.7%) patient. Procedure-related morbidity and mortality were 8.6% (5/58) and 0%, respectively. From 95% of still circulating immediate postprocedure angiographic outcomes, 68% progressed to aneurysm occlusion at 6 months and 95%, to occlusion at 12 months, with a 0% aneurysm rupture rate. CONCLUSIONS Flow diverters seem to be an effective treatment alternative for complex MCA bifurcation aneurysms, with reasonable complication rates. Longer angiographic follow-ups are needed to assess the morphologic outcome; immediate subtotal occlusions do not seem to be related to rupture.
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Affiliation(s)
- C Iosif
- From the Interventional Neuroradiology Department (C.I., C.M., S.S.), Dupuytren University Hospital (Centre Hospitalier Universitaire Limoges), Limoges, France
| | - C Mounayer
- From the Interventional Neuroradiology Department (C.I., C.M., S.S.), Dupuytren University Hospital (Centre Hospitalier Universitaire Limoges), Limoges, France
| | - K Yavuz
- Interventional Neuroradiology Department (K.Y.), Ankara University, School of Medicine, Ankara, Turkey
| | - S Saleme
- From the Interventional Neuroradiology Department (C.I., C.M., S.S.), Dupuytren University Hospital (Centre Hospitalier Universitaire Limoges), Limoges, France
| | - S Geyik
- Interventional Neuroradiology Department (S.G.), Memorial HealthCare Group, Istanbul, Turkey
| | - H S Cekirge
- Interventional Neuroradiology Department (H.S.C.), Koru Hospital and Bayındır Hospital, Ankara, Turkey
| | - I Saatci
- Interventional Neuroradiology Department (I.S.), Yuksek Ihtisas University, Koru Hospital, Ankara, Turkey
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