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Sengupta S, Yuan X, Maga L, Pirola S, Nienaber CA, Xu XY. Aortic haemodynamics and wall stress analysis following arch aneurysm repair using a single-branched endograft. Front Cardiovasc Med 2023; 10:1125110. [PMID: 37283581 PMCID: PMC10240084 DOI: 10.3389/fcvm.2023.1125110] [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: 12/15/2022] [Accepted: 05/08/2023] [Indexed: 06/08/2023] Open
Abstract
Introduction Thoracic endovascular aortic repair (TEVAR) of the arch is challenging given its complex geometry and the involvement of supra-aortic arteries. Different branched endografts have been designed for use in this region, but their haemodynamic performance and the risk for post-intervention complications are not yet clear. This study aims to examine aortic haemodynamics and biomechanical conditions following TVAR treatment of an aortic arch aneurysm with a two-component single-branched endograft. Methods Computational fluid dynamics and finite element analysis were applied to a patient-specific case at different stages: pre-intervention, post-intervention and follow-up. Physiologically accurate boundary conditions were used based on available clinical information. Results Computational results obtained from the post-intervention model confirmed technical success of the procedure in restoring normal flow to the arch. Simulations of the follow-up model, where boundary conditions were modified to reflect change in supra-aortic vessel perfusion observed on the follow-up scan, predicted normal flow patterns but high levels of wall stress (up to 1.3M MPa) and increased displacement forces in regions at risk of compromising device stability. This might have contributed to the suspected endoleaks or device migration identified at the final follow up. Discussion Our study demonstrated that detailed haemodynamic and biomechanical analysis can help identify possible causes for post-TEVAR complications in a patient-specific setting. Further refinement and validation of the computational workflow will allow personalised assessment to aid in surgical planning and clinical decision making.
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Affiliation(s)
- Sampad Sengupta
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
| | - Xun Yuan
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
- Cardiology and Aortic Centre, Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Ludovica Maga
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milan, Italy
- Department of Biomechanical Engineering, Delft University of Technology, Delft, Netherlands
| | - Selene Pirola
- Department of Biomechanical Engineering, Delft University of Technology, Delft, Netherlands
| | - Christoph A. Nienaber
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
- Cardiology and Aortic Centre, Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, London, United Kingdom
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Bellamkonda KS, Yousef S, Zhang Y, Dardik A, Geirsson A, Chaar CIO. Endograft type and anesthesia mode are associated with mortality of endovascular aneurysm repair for ruptured abdominal aortic aneurysms. Vascular 2020; 29:155-162. [PMID: 32787557 DOI: 10.1177/1708538120947859] [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] [Indexed: 11/17/2022]
Abstract
OBJECTIVE Endovascular aneurysm repair has become the primary treatment modality for ruptured infrarenal abdominal aortic aneurysm. This study examines the impact of endograft type on perioperative outcomes for ruptured infrarenal abdominal aortic aneurysm. METHOD The targeted endovascular aneurysm repair files of the American College of Surgeons National Surgical Quality Improvement Program database (2012-2017) were used. Only patients treated for ruptured infrarenal abdominal aortic aneurysm were included. All patients requiring concomitant stenting of the visceral arteries or aneurysmal iliac arteries or open abdominal surgery were excluded. The characteristics of patients treated with the different endografts and the corresponding outcomes were compared using Stata software. RESULTS There were 479 patients treated with the three most common endografts: Cook Zenith (n = 127), Gore Excluder (n = 239), and Medtronic Endurant (n = 113). The number of other endografts was too small for statistical analysis. Compared to patients treated with Excluder or Endurant, the patients treated with Zenith had significantly lower body mass index (P < .001) and were less likely to be white (P < .001). On the other hand, patients treated with Endurant were less likely to be smoker (P = .016). Patients treated with Zenith had significantly larger ruptured infrarenal abdominal aortic aneurysm diameter (P = .045). The overall mortality was 18% and morbidity 74.3%. There was a statistically significant difference in overall mortality (Zenith = 11.8%, Excluder = 18%, Endurant = 24.8%, P = .033) but not morbidity (P = .808) between the three groups. Post hoc analysis for overall mortality showed only significant difference between Zenith and Endurant. The difference in mortality was not significant in patients presenting with ruptured infrarenal abdominal aortic aneurysm without hypotension (P = .065). On multivariable analysis, treatment with the Endurant endograft was associated with increased mortality compared to Zenith (odds ratio = 3.0 [confidence interval 1.31-6.7]). General anesthesia (odds ratio = 2.67 [confidence interval 1.02-7.02]), rupture with hypotension (odds ratio = 4.49 [confidence interval 2.54-7.95]), and dependent functional status (odds ratio = 5.7 [confidence interval 1.96-16.59]) were independently associated with increased mortality while increasing body mass index (odds ratio = 0.97 [confidence interval 0.95-0.99]) was associated with reduced risk of mortality. CONCLUSIONS This study highlights contemporary outcomes of endovascular aneurysm repair for ruptured infrarenal abdominal aortic aneurysm with relatively low mortality. Endograft type and anesthesia technique are modifiable factors that can potentially improve outcomes. Significant variation in the outcomes of the different endografts warrants further research.
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Affiliation(s)
| | - Sameh Yousef
- Section of Cardiac Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Yawei Zhang
- Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Alan Dardik
- Section of Vascular Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Arnar Geirsson
- Section of Cardiac Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
| | - Cassius I Ochoa Chaar
- Section of Vascular Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT, USA
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Falkensammer J, Taher F, Plimon M, Kliewer M, Walter C, Pelanek E, Assadian A. Assessment of Pull-out Forces in TEVAR and ANACONDA FEVAR Combination and Early Clinical Results: Creation of a Proximal Landing Zone for FEVAR in Patients with Extent I and Extent IV TAAAs. Ann Vasc Surg 2020; 66:160-170. [PMID: 31978487 DOI: 10.1016/j.avsg.2020.01.075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/07/2020] [Accepted: 01/12/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Although recent data on the treatment of thoracoabdominal aortic aneurysms (TAAAs) are promising, in some cases, the paravisceral segment of the aorta may not be suitable for a branched endograft due to space restrictions. A combination of a fenestrated aneurysm repair (FEVAR) with a thoracic aneurysm repair (TEVAR) may represent a feasible treatment option. The current investigation was performed to assess the stability of a fenestrated Anaconda device implanted into a set of thoracic endografts from different manufacturers. We then assessed our clinical results with the FEVAR/TEVAR combination. METHODS Pull-out forces were measured in vitro after docking a fenestrated Anaconda graft within the distal end of different TEVAR devices. Anaconda devices were implanted in 28- or 30-mm thoracic tube grafts (oversizing of at least 2 mm: 13.3-21.4; minimum overlap of 15 mm). Continuously increasing longitudinal pull forces of up to 100 N were applied on an Instron Tensile Tester. Initial break point and damage to the endografts were documented. Clinical results of patients treated with such an FEVAR/TEVAR combination at our institution are presented as a second part of this study. RESULTS Median pull-out forces ranged from 2.38 N to 55.0 N. The highest stability was achieved with 34-mm Anaconda devices in 28-mm thoracic tube grafts. Grafts with either thinner Dacron material or those featuring a polytetrafluorethylene membrane seemed especially vulnerable to punctures and tears caused by the downward-looking hooks of the Anaconda device. Between April 1, 2013 and December 31, 2018, in 28 of 172 patients treated with a fenestrated Anaconda device, prior implantation of a thoracic tube graft was necessary to create a sufficient proximal landing zone. In 25 cases (89.3%), the aneurysm was successfully treated. Although the 30-day reintervention rate in this subgroup was relatively high at 28.6%, none of these was due to a failure of the FEVAR/TEVAR combination. Upon an average follow-up of 15 months, no failure of the graft connection and no type III endoleak due to membrane damage were observed. CONCLUSIONS The combination of a thoracic tube graft and a fenestrated Anaconda device is a viable option for the treatment of patients with Extent I or IV TAAAs with no adequate landing zone above the celiac trunk. Although pull-out testing has shown good stability with most assessed grafts, the thoracic devices with thicker Dacron membranes seemed to be especially suitable.
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Affiliation(s)
- Jürgen Falkensammer
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria; Sigmund Freud Private University, Medical School, Vienna, Austria.
| | - Fadi Taher
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
| | - Markus Plimon
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
| | - Miriam Kliewer
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
| | - Corinna Walter
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
| | - Elisabeth Pelanek
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
| | - Afshin Assadian
- Department of Vascular and Endovascular Surgery, Wilhelminenhospital, Vienna, Austria
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Bewley BR, Servais AB, Salehi P. The evolution of stent grafts for endovascular repair of abdominal aortic aneurysms: how design changes affect clinical outcomes. Expert Rev Med Devices 2019; 16:965-980. [DOI: 10.1080/17434440.2019.1684897] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | | | - Payam Salehi
- Tufts University School of Medicine, Boston, MA, USA
- Department of Surgery, Tufts Medical Center, Boston, MA, USA
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5
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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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Saratzis A, Modarai B. Commentary: Understanding the Role of EndoAnchors in Infrarenal Endovascular Aneurysm Repair. J Endovasc Ther 2019; 26:714-716. [DOI: 10.1177/1526602819865555] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Athanasios Saratzis
- Academic Department of Vascular Surgery, School of Cardiovascular Medicine and Sciences, British Heart Foundation Centre of Excellence, and the Biomedical Research Centre at Guy’s & St Thomas’ NHS Foundation Trust and King’s College London, UK
- Department of Cardiovascular Sciences and British Heart Foundation Cardiovascular Research Facility, National Institute for Health Research, Leicester Biomedical Research Centre, Leicester, UK
| | - Bijan Modarai
- Academic Department of Vascular Surgery, School of Cardiovascular Medicine and Sciences, British Heart Foundation Centre of Excellence, and the Biomedical Research Centre at Guy’s & St Thomas’ NHS Foundation Trust and King’s College London, UK
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Goudeketting SR, Vermeulen JJM, van Noort K, te Riet o. g. Scholten G, Kuipers H, Slump CH, de Vries JPPM. Effect of Different EndoAnchor Configurations on Aortic Endograft Displacement Resistance: An Experimental Study. J Endovasc Ther 2019; 26:704-713. [DOI: 10.1177/1526602819857586] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Purpose: This study investigated the effect of different EndoAnchor configurations on aortic endograft displacement resistance in an in vitro model. Materials and Methods: An in vitro model was developed and validated to perform displacement force measurements on different EndoAnchor configurations within an endograft and silicone tube. Five EndoAnchor configurations were created: (1) 6 circumferentially deployed EndoAnchors, (2) 5 EndoAnchors within 120° of the circumference and 1 additional, contralateral EndoAnchor, (3) 4 circumferentially deployed EndoAnchors, (4) 2 rows of 4 circumferentially deployed EndoAnchors, and (5) a configuration of 2 columns of 3 EndoAnchors. An experienced vascular surgeon deployed EndoAnchors under C-arm guidance at the proximal sealing zone of the endograft. A constant force with increments of 1 newton (N) was applied to the distal end of the endograft. The force necessary to displace a part of the endograft by 3 mm was defined as the endograft displacement force (EDF). Two video cameras recorded the measurements. Videos were examined to determine the exact moment 3-mm migration had occurred at part of the endograft. Five measurements were performed after each deployed EndoAnchor for each configuration. Measurements are given as the median and interquartile range (IQR) Q1, Q3. Results: Baseline displacement force measurement of the endograft without EndoAnchors resulted in a median EDF of 5.1 N (IQR 4.8, 5.2). The circumferential distribution of 6 EndoAnchors resulted in a median EDF of 53.7 N (IQR 49.0, 59.0), whereas configurations 2 through 5 demonstrated substantially lower EDFs of 29.0 N (IQR 28.5, 30.1), 24.6 N (IQR 21.9, 27.2), 36.7 N, and 9.6 N (IQR 9.4, 10.0), respectively. Decreasing the distance between the EndoAnchors over the circumference of the endograft increased the displacement resistance. Conclusion: This in vitro study demonstrates the influence EndoAnchor configurations have on the displacement resistance of an aortic endograft. Parts of the endograft where no EndoAnchor has been deployed remain sensitive to migration. In the current model, the only configuration that rivaled a hand-sewn anastomosis was the one with 6 EndoAnchors. A circumferential distribution of EndoAnchors with small distances between EndoAnchors should be pursued, if possible. This study provides a quantification of different EndoAnchor configurations that clinicians may have to adopt in clinical practice, which can help them make a measured decision on where to deploy EndoAnchors to ensure good endograft fixation.
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Affiliation(s)
- Seline R. Goudeketting
- Department of Vascular Surgery, St Antonius Hospital, Nieuwegein, the Netherlands
- MIRA Institute of Biomedical Technology and Technical Medicine, University of Twente, Enschede, the Netherlands
| | - Jenske J. M. Vermeulen
- Department of Vascular Surgery, St Antonius Hospital, Nieuwegein, the Netherlands
- MIRA Institute of Biomedical Technology and Technical Medicine, University of Twente, Enschede, the Netherlands
| | - Kim van Noort
- Department of Vascular Surgery, St Antonius Hospital, Nieuwegein, the Netherlands
- MIRA Institute of Biomedical Technology and Technical Medicine, University of Twente, Enschede, the Netherlands
| | - Gerben te Riet o. g. Scholten
- Robotics and Mechatronics, Faculty of Electrical Engineering, Mathematics & Computer Science, University of Twente, Enschede, the Netherlands
| | - Henny Kuipers
- Robotics and Mechatronics, Faculty of Electrical Engineering, Mathematics & Computer Science, University of Twente, Enschede, the Netherlands
| | - Cornelis H. Slump
- MIRA Institute of Biomedical Technology and Technical Medicine, University of Twente, Enschede, the Netherlands
| | - Jean-Paul P. M. de Vries
- Department of Surgery, Division of Vascular Surgery, University Medical Centre Groningen, the Netherlands
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Patients with large neck diameter have a higher risk of type IA endoleaks and aneurysm rupture after standard endovascular aneurysm repair. J Vasc Surg 2019; 69:783-791. [DOI: 10.1016/j.jvs.2018.07.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 07/02/2018] [Indexed: 11/21/2022]
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9
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The Impact of Suprarenal Fixation on Renal Function Following Endovascular Abdominal Aortic Aneurysm Repair: Meta-analysis Based on Estimated Glomerular Filtration Rate. Eur J Vasc Endovasc Surg 2018; 56:497-506. [DOI: 10.1016/j.ejvs.2018.02.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 02/10/2018] [Indexed: 01/11/2023]
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10
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Georgakarakos E. Editorial: Clinical and Hemodynamic Performance of Aortic Endografts. Front Surg 2018; 5:44. [PMID: 29988320 PMCID: PMC6024003 DOI: 10.3389/fsurg.2018.00044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 06/01/2018] [Indexed: 11/20/2022] Open
Affiliation(s)
- Efstratios Georgakarakos
- Department of Vascular Surgery, Democritus University of Thrace, University Hospital of Alexandroupolis, Alexandroupolis, Greece
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11
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Matched cohort comparison of endovascular abdominal aortic aneurysm repair with and without EndoAnchors. J Vasc Surg 2018; 67:1699-1707. [DOI: 10.1016/j.jvs.2017.10.059] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 10/04/2017] [Indexed: 11/22/2022]
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12
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Lee J, Park KM, Jung S, Cho W, Hong KC, Jeon YS, Cho SG, Lee JB. Occurrences and Results of Acute Kidney Injury after Endovascular Aortic Abdominal Repair? Vasc Specialist Int 2017; 33:135-139. [PMID: 29354623 PMCID: PMC5754070 DOI: 10.5758/vsi.2017.33.4.135] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Revised: 09/02/2017] [Accepted: 09/27/2017] [Indexed: 11/20/2022] Open
Abstract
Purpose Acute kidney injury (AKI) is an important postoperative complication that may impact mortality and morbidity. The incidence of AKI after elective endovascular aneurysm repair (EVAR) is not known well. The aim of this study is to assess the incidence of AKI after elective EVAR and examine the impact of AKI. Materials and Methods Data were collected and analyzed retrospectively from 78 elective EVARs for abdominal aortic aneurysm (AAA) among 102 total cases of conventional EVAR performed in Inha University Hospital from 2009 to 2015. The primary endpoint was incidence and risk factors of AKI. Secondary endpoints included drop in estimated glomerular filtration rate (eGFR) and the mortality of AKI. Results We included 78 patients (17 females, 21%; mean age, 73.9±12.5 years; mean AAA diameter, 59.3±8.9 cm), 11 (14.1%) of whom developed AKI. Within 48 hours, those with AKI experienced a decrease in eGFR from 65.5±21.2 to 51.2±19.6 mL/kg/1.73 m2, and those without AKI showed a change from 73.1±9.2 to 74.2±10.7 mL/kg/1.73 m2. There were no patients who required dialysis during follow-up (mean, 24.2±18.0 months). Development of AKI was related to operation time (odds ratio [OR], 2.024; 95% confidence interval [CI], 1.732–4.723; P<0.010) and contrast dose (OR, 3.192; 95% CI, 2.182–4.329; P<0.010). There were no differences in mortality between the 2 groups (P=0.784). Conclusion The incidence of AKI after EVAR was related to operation time and contrast dose, but was not associated with medium-term mortality.
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Affiliation(s)
- Jeahong Lee
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
| | - Keun-Myoung Park
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
| | - Sungteak Jung
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
| | - Wonpyo Cho
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
| | - Kee Chun Hong
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
| | - Yong Sun Jeon
- Department of Radiology, Inha University College of Medicine, Incheon, Korea
| | - Soon Gu Cho
- Department of Radiology, Inha University College of Medicine, Incheon, Korea
| | - Jung Bum Lee
- Department of Surgery, Inha University College of Medicine, Incheon, Korea
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‘t Mannetje YW, Cuypers PW, Saleem BR, Bode AS, Teijink JA, van Sambeek MR. Comparison of midterm results for the Talent and Endurant stent graft. J Vasc Surg 2017; 66:735-742. [DOI: 10.1016/j.jvs.2017.01.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 01/08/2017] [Indexed: 12/13/2022]
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Skervin AL, Lim CS, Sritharan K. Improving Patient Compliance With Post-EVAR Surveillance May Prevent Late Rupture. Vasc Endovascular Surg 2017; 51:522-526. [PMID: 28782417 DOI: 10.1177/1538574417718447] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Endovascular aneurysm repair (EVAR) has gained increasing popularity in the treatment of infrarenal abdominal aortic aneurysm. Despite its favorable early outcomes, the long-term efficacy of EVAR remains a concern. Late rupture is the ultimate treatment failure and continues to complicate EVAR. Univariate and multivariate analyses have identified factors predictive of late rupture. The importance of EVAR surveillance to prevent late complications is equally widely acknowledged. This article aims to present our current understanding of the precipitating factors of late rupture after EVAR and explores whether the key to its prevention lies within improving patient factors, particularly compliance to follow-up appointments or whether physicians hold the solution.
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Affiliation(s)
- Alicia L Skervin
- 1 Academic Section of Vascular Surgery, Charing Cross Hospital, London, United Kingdom
| | - Chung S Lim
- 1 Academic Section of Vascular Surgery, Charing Cross Hospital, London, United Kingdom
| | - Kaji Sritharan
- 2 St George's Vascular Institute, Blackshaw Road, London, United Kingdom
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15
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Oliveira NF, Bastos Gonçalves FM, Van Rijn MJ, de Ruiter Q, Hoeks S, de Vries JPP, van Herwaarden JA, Verhagen HJ. Standard endovascular aneurysm repair in patients with wide infrarenal aneurysm necks is associated with increased risk of adverse events. J Vasc Surg 2017; 65:1608-1616. [DOI: 10.1016/j.jvs.2016.09.052] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 09/26/2016] [Indexed: 11/24/2022]
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16
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Jhaveri KD, Saratzis AN, Wanchoo R, Sarafidis PA. Endovascular aneurysm repair (EVAR)– and transcatheter aortic valve replacement (TAVR)–associated acute kidney injury. Kidney Int 2017; 91:1312-1323. [DOI: 10.1016/j.kint.2016.11.030] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 11/04/2016] [Accepted: 11/08/2016] [Indexed: 01/20/2023]
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17
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Schoretsanitis N, Georgakarakos E, Argyriou C, Ktenidis K, Georgiadis GS. A critical appraisal of endovascular stent-grafts in the management of abdominal aortic aneurysms. Radiol Med 2017; 122:309-318. [DOI: 10.1007/s11547-017-0724-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Accepted: 01/03/2017] [Indexed: 11/30/2022]
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18
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Kandail H, Hamady M, Xu XY. Effect of a Flared Renal Stent on the Performance of Fenestrated Stent-Grafts at Rest and Exercise Conditions. J Endovasc Ther 2016; 23:809-20. [PMID: 27225213 PMCID: PMC5023035 DOI: 10.1177/1526602816651425] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To quantify the hemodynamic impact of a flared renal stent on the performance of fenestrated stent-grafts (FSGs) by analyzing flow patterns and wall shear stress-derived parameters in flared and nonflared FSGs in different physiologic scenarios. METHODS Hypothetical models of FSGs were created with and without flaring of the proximal portion of the renal stent. Flared FSGs with different dilation angles and protrusion lengths were examined, as well as a nonplanar flared FSG to account for lumbar curvature. Laminar and pulsatile blood flow was simulated by numerically solving Navier-Stokes equations. A physiologically realistic flow rate waveform was prescribed at the inlet, while downstream vasculature was modeled using a lumped parameter 3-element windkessel model. No slip boundary conditions were imposed at the FSG walls, which were assumed to be rigid. While resting simulations were performed on all the FSGs, exercise simulations were also performed on a flared FSG to quantify the effect of flaring in different physiologic scenarios. RESULTS For cycle-averaged inflow of 2.94 L/min (rest) and 4.63 L/min (exercise), 27% of blood flow was channeled into each renal branch at rest and 21% under exercise for all the flared FSGs examined. Although the renal flow waveform was not affected by flaring, flow within the flared FSGs was disturbed. This flow disturbance led to high endothelial cell activation potential (ECAP) values at the renal ostia for all the flared geometries. Reducing the dilation angle or protrusion length and exercise lowered the ECAP values for flared FSGs. CONCLUSION Flaring of renal stents has a negligible effect on the time dependence of renal flow rate waveforms and can maintain sufficient renal perfusion at rest and exercise. Local flow patterns are, however, strongly dependent on renal flaring, which creates a local flow disturbance and may increase the thrombogenicity at the renal ostia. Smaller dilation angles, shorter protrusion lengths, and moderate lower limb exercise are likely to reduce the risk of thrombosis in flared geometries.
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Affiliation(s)
| | - Mohamad Hamady
- Department of Interventional Radiology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, UK
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Meta-analysis of Outcomes Following Aneurysm Repair in Patients with Synchronous Intra-abdominal Malignancy. Eur J Vasc Endovasc Surg 2016; 52:747-756. [PMID: 27592036 DOI: 10.1016/j.ejvs.2016.07.084] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 07/20/2016] [Indexed: 01/11/2023]
Abstract
OBJECTIVES The management of concomitant intra-abdominal malignancy (IAM) and abdominal aortic aneurysm (AAA) remains a challenge, even though malignancy is common in an elderly population. By means of systematic review and meta-analysis, the aim was to investigate outcomes in patients undergoing open (OAR) or endovascular AAA repair (EVAR) that have a concomitant malignancy. METHODS A systematic literature review was performed (Medline and EMBASE databases) to identify all series reporting outcomes of AAA repair (OAR or EVAR) in patients with concomitant IAM. Meta-analysis was applied to assess mortality and major morbidity at 30 days and long term. RESULTS The literature review identified 36 series (543 patients) and the majority (18 series) reported on patients with colorectal malignancy and AAA. Mean weighted mortality for OAR at 30 days was 11% (95% CI: 6.6% to 17.9%); none of the EVAR patients died peri-operatively. The weighted 30-day major complication rate for EVAR was 20.4% (10.0-37.4%) and for OAR it was 15.4% (7.0-30.8%). Most patients had their AAA and malignancy treated non-simultaneously (56.6%, 95% CI, 42.1-70.1%). In the EVAR cohort, three patients (4.6%) died at last follow-up (range 24-64 months). In the OAR cohort 23 (10.6%) had died at last follow up (range from 4 to 73 months). CONCLUSION In this meta-analysis, OAR was associated with significant peri-operative mortality in patients with an IAM. EVAR should be the first-line modality of AAA repair. The majority of patients were not treated simultaneously for the two pathologies, but further investigation is necessary to define the optimal timing for each procedure and malignancy.
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Roos H, Tokarev M, Chernoray V, Ghaffari M, Falkenberg M, Jeppsson A, Nilsson H. Displacement Forces in Stent Grafts: Influence of Diameter Variation and Curvature Asymmetry. Eur J Vasc Endovasc Surg 2016; 52:150-6. [DOI: 10.1016/j.ejvs.2016.04.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Accepted: 04/16/2016] [Indexed: 10/21/2022]
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Colvard B, Georg Y, Chakfe N, Swanstrom L. Current aortic endografts for the treatment of abdominal aortic aneurysms. Expert Rev Med Devices 2016; 13:475-86. [PMID: 26959727 DOI: 10.1586/17434440.2016.1162709] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Endovascular Aneurysm Repair is a widely adopted method of treatment for patients with abdominal aortic aneurysms. The minimally invasive approach offered with EVAR has become popular not only among physicians and patients, but in the medical device industry as well. Over the past 25 years the global market for aortic endografts has increased rapidly, resulting in a wide range of devices from various companies. Currently, there are seven endografts approved by the FDA for the treatment of abdominal aortic aneurysms. These devices offer a wide range of designs intended to increase inclusion criteria while decreasing technical complications such as endoleak and migration. Despite advances in device design, secondary interventions and follow-up requirements remain a significant issue. New devices are currently being studied in the U.S. and abroad and may significantly reduce complications and secondary interventions.
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Affiliation(s)
| | - Yannick Georg
- b Department of Vascular Surgery , CHU Strasbourg , Strasbourg , France
| | - Nabil Chakfe
- b Department of Vascular Surgery , CHU Strasbourg , Strasbourg , France
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An in Vitro Twist Fatigue Test of Fabric Stent-Grafts Supported by Z-Stents vs. Ringed Stents. MATERIALS 2016; 9:ma9020113. [PMID: 28787913 PMCID: PMC5456472 DOI: 10.3390/ma9020113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Revised: 01/27/2016] [Accepted: 02/03/2016] [Indexed: 11/17/2022]
Abstract
Whereas buckling can cause type III endoleaks, long-term twisting of a stent-graft was investigated here as a mechanism leading to type V endoleak or endotension. Two experimental device designs supported with Z-stents having strut angles of 35° or 45° were compared to a ringed control under accelerated twisting. Damage to each device was assessed and compared after different durations of twisting, with focus on damage that may allow leakage. Stent-grafts with 35° Z-stents had the most severe distortion and damage to the graft fabric. The 45° Z-stents caused less fabric damage. However, consistent stretching was still seen around the holes for sutures, which attach the stents to the graft fabric. Larger holes may become channels for fluid percolation through the wall. The ringed stent-graft had the least damage observed. Stent apexes with sharp angles appear to be responsible for major damage to the fabrics. Device manufacturers should consider stent apex angle when designing stent-grafts, and ensure their devices are resistant to twisting.
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Swaelens C, Poole RJ, Torella F, McWilliams RG, England A, Fisher RK. Type IIIb Endoleak and Relining. J Endovasc Ther 2016; 23:297-301. [DOI: 10.1177/1526602816631106] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Purpose: To examine the changes in distraction force following relining of a conventional abdominal aortic stent-graft with a type IIIb endoleak using the Nellix endovascular sealing device compared to a unilateral stent-graft. Methods: Relining is often used to repair type IIIb endoleaks, but the consequences to graft stability are unknown. A mathematical model was constructed based on pressure and volume flow through the stent-grafts, incorporating recognized distraction force equations. Steady flow was presumed at peak systolic pressures to calculate the maximum distraction force, with gravity ignored. Distraction forces for 28- to 36-mm-diameter stent-graft bodies with 16-mm limbs were calculated and compared to forces following relining with single and double Nellix devices or the Renu unilateral device. Results: Distraction forces for the 28-, 32-, and 36-mm stent-grafts prior to relining were 5.99, 10.21, and 14.99 N, respectively. Similar forces were reported after relining with bilateral Nellix devices (5.86, 10.08, and 14.86 N, respectively). However, use of a unilateral Nellix increased the distraction forces to 9.92, 14.14, and 18.92 N, respectively. These were comparable to the increase observed after relining with a Renu unilateral stent-graft (9.87, 14.09, and 18.86 N, respectively). The proportional increase in distraction force for a unilateral relining ranged from 26% to 66%, with the greatest increase noted in the smaller diameter main bodies. Conclusion: Relining a stent-graft with a type IIIb endoleak using bilateral Nellix devices does not increase the distraction force. However, a unilateral Nellix device or the Renu system could theoretically increase the distraction force by up to 66%, potentially risking migration and type Ia endoleak. In clinical practice, these results suggest that a relining with bilateral Nellix may have benefits over the Renu unilateral stent-graft.
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Affiliation(s)
- Charles Swaelens
- Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital, Liverpool, UK
| | | | - Francesco Torella
- Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital, Liverpool, UK
| | - Richard G. McWilliams
- Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital, Liverpool, UK
| | | | - Robert K. Fisher
- Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital, Liverpool, UK
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Rahmani S, Grewal IS, Nabovati A, Doyle MG, Roche-Nagle G, Tse LW. Increasing angulation decreases measured aortic stent graft pullout forces. J Vasc Surg 2016; 63:493-9. [DOI: 10.1016/j.jvs.2014.06.115] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 06/14/2014] [Indexed: 11/17/2022]
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Coulston J, Baigent A, Selvachandran H, Jones S, Torella F, Fisher R. Lack of Iliac Engagement Correlates With Iliac Limb Complications Following Standard EVAR. Vasc Endovascular Surg 2015; 49:201-5. [DOI: 10.1177/1538574415614403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Objective: An adequate distal sealing zone is a prerequisite for successful endovascular aneurysm repair (EVAR). Poor engagement of iliac limbs within the common iliac artery potentially increases the risk of limb-related complications. The aim of this study was to investigate the proportion of common iliac artery used for distal sealing as a predictor of iliac limb complications following standard EVAR. Methods: This was a retrospective case controlled study where an iliac complication group was compared to a larger control group from the unit database. Core analysis of postoperative computed tomography scans was used to ascertain the percentage engagement of the iliac limb of the stent graft within the native iliac artery in both groups. Results: There were 240 limbs in the control group and 33 limbs in the complications group. Complications included 10 endoleaks, 1 iliac limb dislocation, 2 insufficient engagement, 4 occlusions, and 16 kinks. The proportion of common iliac artery engagement was significantly higher in the control group compared with the complications group (75.3:68.6%, P = .003). Conclusions: Increased engagement in the common iliac artery following standard EVAR reduces the risks of limb complications. A clinical guide utilization of more than 70% of the total length of common iliac artery could be used as this was associated with a significantly lower rate of iliac limb complications following standard EVAR.
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Affiliation(s)
- James Coulston
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
| | - Amy Baigent
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
| | - Haran Selvachandran
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
| | - Steven Jones
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
| | - Francesco Torella
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
| | - Robert Fisher
- Liverpool Vascular and Endovascular Service, Regional Vascular Unit, Royal Liverpool Hospital, Liverpool, England
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Saratzis A, Bath MF, Harrison S, Sayers RD, Mahmood A, Sarafidis P, Bown MJ. Long-Term Renal Function after Endovascular Aneurysm Repair. Clin J Am Soc Nephrol 2015; 10:1930-6. [PMID: 26487770 DOI: 10.2215/cjn.04870515] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 08/12/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND OBJECTIVES Endovascular repair (EVAR) is a common treatment for abdominal aortic aneurysm (AAA). However, its long-term effects on renal function remain unclear. We aimed to assess long-term renal dysfunction after EVAR using a contemporary estimate of GFR and to compare long-term renal outcomes in patients after EVAR with open aneurysm repair (OAR) and in patients without an AAA. DESIGN, SETTINGS, PARTICIPANTS, & MEASUREMENTS We performed a nested case-matched analysis of 726 patients (using a prospectively maintained database for repairs that took place between January 2000 and May 2010 in a tertiary center): 121 patients undergoing OAR (with data at baseline and 5 years postrepair) were case matched (age, sex, smoking, diabetes, baseline eGFR) to patients undergoing suprarenal and infrarenal fixation EVAR (242 in each group) and to 121 patients undergoing carotid endarterectomy (CEA) without AAA. Changes in eGFR were compared (1 and 5 years). RESULTS The OAR patients lost an average of 7.4 ml/min per 1.73 m2 at 5 years (95% confidence interval [95% CI], 4.8 to 10.6), compared with 8.2 ml/min per 1.73 m2 (95% CI, 6.5 to 10.8; P<0.001) for infrarenal-fixation EVAR, 16.9 ml/min per 1.73 m2 (95% CI, 13.0 to 21.9, P<0.001) for suprarenal-fixation EVAR, and 5.4 ml/min per 1.73 m2 (95% CI, 1.7 to 7.5; P<0.001) for CEA. The decrease in eGFR was steeper during the first postoperative year, with each group losing -2.2 ml/min per 1.73 m2 (infrarenal-fixation EVAR), -10.7 ml/min per 1.73 m2 (suprarenal-fixation EVAR), and -4.6 ml/min per 1.73 m2 (OAR), compared with -1.9 ml/min per 1.73 m2 for CEA. CONCLUSIONS Elective EVAR is associated with a significant decline in eGFR after 5 years, which is steeper in the first postoperative year and more pronounced compared with a similar population with atherosclerotic disease.
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Affiliation(s)
- Athanasios Saratzis
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
| | - Michael F Bath
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
| | - Seamus Harrison
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
| | - Robert D Sayers
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
| | - Asif Mahmood
- University Hospital Coventry and Warwickshire, Coventry, United Kingdom
| | - Pantelis Sarafidis
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
| | - Matthew J Bown
- Department of Cardiovascular Sciences and Leicester NIHR Cardiovascular Biomedical Research Unit, Leicester, United Kingdom; and
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Saratzis A, Bown MJ, Sayers RD. Commentary: Late Rupture After Endovascular Aneurysm Repair. J Endovasc Ther 2015; 22:745-7. [DOI: 10.1177/1526602815601837] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Athanasios Saratzis
- Department of Cardiovascular Sciences and NIHR Leicester Cardiovascular Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Matthew J. Bown
- Department of Cardiovascular Sciences and NIHR Leicester Cardiovascular Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Robert D. Sayers
- Department of Cardiovascular Sciences and NIHR Leicester Cardiovascular Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
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Saratzis AN, Bath MF, Harrison SC, Sayers RD, Bown MJ. Impact of Fenestrated Endovascular Abdominal Aortic Aneurysm Repair on Renal Function. J Endovasc Ther 2015; 22:889-96. [DOI: 10.1177/1526602815605311] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Purpose: To investigate the impact of fenestrated endovascular aneurysm repair (fEVAR) on renal function perioperatively and at midterm. Methods: A case-controlled study was performed involving 58 patients (mean age 75±7 years; 51 men) who underwent elective fEVAR for a juxtarenal or short-necked abdominal aortic aneurysm (AAA) matched on age, sex, smoking, diabetes, and baseline estimated glomerular filtration rate (eGFR) with a contemporaneous group undergoing open aneurysm repair (OAR) for the same indications. Perioperative incidence of acute kidney injury (AKI) and levels of eGFR at 30 days and 1 year were compared. A systematic literature review was performed to identify studies that had used eGFR as renal outcome after fEVAR; the pooled data were meta-analyzed using an eGFR drop >30% at 1 month and the latest follow-up as endpoints. Results are reported as the pooled proportion and 95% confidence interval (CI). Results: The incidence of AKI after fEVAR was 28% compared to 10% after OAR (p=0.03). Following fEVAR, the mean eGFR dropped from 78±8 to 74±9 mL/min/1.73 m2 at 30 days compared to a change from 79±8 to 80±16 mL/min/1.73 m2 after OAR (p<0.01). However, the absolute drop in eGFR between fEVAR and OAR at 1 year was similar (7 mL/min/1.73 m2; p=0.53); 7% of the fEVAR patients had an eGFR drop >30% at that point compared with none for OAR (p=0.12). The systematic literature review identified eGFR outcomes for 193 fEVAR patients. Combining these patients with the 58 from our cohort study, the pooled proportions of eGFR drop >30% were 20% (95% CI 9% to 39%) at 30 days and 8% (95% CI 0.5% to 13%) at the end of follow-up. Conclusion: fEVAR has a significant perioperative impact on renal function, but 1-year results are similar to OAR. fEVAR patients may benefit from targeted AKI prevention strategies that need to be assessed in relevant studies.
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Affiliation(s)
- Athanasios N. Saratzis
- Department of Cardiovascular Sciences and the NIHR Leicester Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Michael F. Bath
- Department of Cardiovascular Sciences and the NIHR Leicester Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Seamus C. Harrison
- Department of Cardiovascular Sciences and the NIHR Leicester Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Robert D. Sayers
- Department of Cardiovascular Sciences and the NIHR Leicester Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - Matthew J. Bown
- Department of Cardiovascular Sciences and the NIHR Leicester Biomedical Research Unit, University of Leicester, Leicester Royal Infirmary, Leicester, UK
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Melas N, Stavridis K, Saratzis A, Lazarides J, Gitas C, Saratzis N. Active Proximal Sealing in the Endovascular Repair of Abdominal Aortic Aneurysms. J Endovasc Ther 2015; 22:174-8. [DOI: 10.1177/1526602815573232] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Purpose: To investigate the performance of a new device that uses the STRATA polytetrafluoroethylene graft material and a mechanism that provides active proximal sealing in order to prevent type Ia endoleak during endovascular aneurysm repair (EVAR). Methods: Between April 2013 and July 2014, 21 consecutive patients (all men; median age 71 years, range 60–84 years) with abdominal aortic aneurysm (median diameter 5.9 cm, range 4.9–7.8 cm) and suitable anatomy were offered elective EVAR using the AFX endograft. These patients had an irregular, conical, tapered, or bulging proximal neck, for which this specific device was considered appropriate. Aneurysm exclusion and incidence of type Ia endoleak were the primary outcomes; secondary outcomes included mortality, morbidity, migration, and other graft-related complications. Results: Primary technical success was 90%; 2 intraoperative type Ia endoleaks due to low endograft deployment were treated with additional proximal cuffs. During a median follow-up of 10 months (range 2–15 months), no type I endoleak was observed. One type II endoleak was encountered, with no associated sac enlargement. There was no stent-graft migration or any other device-related complication. One patient had a nonfatal myocardial infarction and another developed renal failure requiring transient dialysis. No deaths occurred. Conclusion: In this early experience, this newly available device appears to be safe and efficient in providing seal along irregularly shaped necks over the short term.
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Affiliation(s)
- Nikolaos Melas
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
| | - Kyriakos Stavridis
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
| | - Athanasios Saratzis
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
- University of Leicester, Leicester, UK
| | - John Lazarides
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
| | - Christos Gitas
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
| | - Nikolaos Saratzis
- Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece
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Georgakarakos E, Gasser TC, Xenos M, Kontopodis N, Georgiadis GS, Ioannou CV. Applying findings of computational studies in vascular clinical practice: fact, fiction, or misunderstanding? J Endovasc Ther 2015; 21:434-8. [PMID: 24915594 DOI: 10.1583/14-4718e.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Efstratios Georgakarakos
- 1 Department of Vascular Surgery, "Democritus" University of Thrace, University Hospital of Alexandroupolis, Greece
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Jones SM, Poole RJ, How TV, Williams RL, McWilliams RG, Brennan JA, Vallabhaneni SR, Fisher RK. Computational fluid dynamic analysis of the effect of morphologic features on distraction forces in fenestrated stent grafts. J Vasc Surg 2014; 60:1648-56.e1. [DOI: 10.1016/j.jvs.2014.08.077] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 08/17/2014] [Indexed: 11/15/2022]
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de Vries JPP, Ouriel K, Mehta M, Varnagy D, Moore WM, Arko FR, Joye J, Jordan WD, Jordan WD, Paul de Vries J, Joye J, Eckstein H, van Herwaarden J, Arko FR, Bove P, Bohannon W, Fioole B, Setacci C, Resch T, Riambau V, Scheinert D, Clair D, Moursi M, Farber M, Tessarek J, Torsello G, Fillinger M, Glickman M, Henretta J, Hodgson K, Jim J, Katzen B, Lipsitz E, Cox M, Naslund T, Ramaiah V, Schermerhorn M, Schneider P, Starnes BW, Donayre C, Mehta M, Zipfel B, Malhotra N, Varnagy D, Moore W, Cheshire N, Bicknell C, Back M, Muhs B, Malas MB, Hussain S, Gupta N, Bockler D, Verhoeven E, Reijnen M. Analysis of EndoAnchors for endovascular aneurysm repair by indications for use. J Vasc Surg 2014; 60:1460-7.e1. [DOI: 10.1016/j.jvs.2014.08.089] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 08/12/2014] [Indexed: 11/28/2022]
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Saratzis A, Sarafidis P, Melas N, Khaira H. Comparison of the impact of open and endovascular abdominal aortic aneurysm repair on renal function. J Vasc Surg 2014; 60:597-603. [DOI: 10.1016/j.jvs.2014.03.282] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 03/26/2014] [Indexed: 01/25/2023]
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Kandail H, Hamady M, Xu XY. Patient-specific analysis of displacement forces acting on fenestrated stent grafts for endovascular aneurysm repair. J Biomech 2014; 47:3546-54. [PMID: 25267572 DOI: 10.1016/j.jbiomech.2014.08.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 08/01/2014] [Accepted: 08/09/2014] [Indexed: 11/20/2022]
Abstract
Treatment options for abdominal aortic aneurysm (AAA) include highly invasive open surgical repair or minimally invasive endovascular aneurysm repair (EVAR). Despite being minimally invasive, some patients are not suitable for EVAR due to hostile AAA morphology. Fenestrated-EVAR (F-EVAR) was introduced to address these limitations of standard EVAR, where AAA is treated using a Fenestrated Stent Graft (FSG). In order to assess durability of F-EVAR, displacement forces acting on FSGs were analysed in this study, based on patient-specific geometries reconstructed from computed tomography (CT) scans. The magnitude and direction of the resultant displacement forces acting on the FSG were numerically computed using computational fluid dynamics (CFD) with a rigid wall assumption. Although displacement force arises from blood pressure and friction due to blood flow, numerical simulations elucidated that net blood pressure is the dominant contributor to the overall displacement force; as a result, time dependence of the resultant displacement force followed pressure waveform very closely. The magnitude of peak displacement force varied from 1.9N to 14.3N with a median of 7.0N. A strong positive correlation was found between inlet cross-sectional area (CSA), anterior/posterior (A/P) angle and the peak displacement force i.e. as inlet CSA or A/P angle increases, the magnitude of resultant displacement increases. This study manifests that while loads exerted by the pulsatile flow dictates the cyclic variation of the displacement force, its magnitude depends not only on blood pressure but also the FSG morphology, with the latter determining the direction of the displacement force.
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Affiliation(s)
- Harkamaljot Kandail
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, UK
| | - Mohammad Hamady
- Department of Interventional Radiology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, UK.
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Georgakarakos E, Argyriou C, Schoretsanitis N, Ioannou CV, Kontopodis N, Morgan R, Tsetis D. Geometrical Factors Influencing the Hemodynamic Behavior of the AAA Stent Grafts: Essentials for the Clinician. Cardiovasc Intervent Radiol 2014; 37:1420-9. [DOI: 10.1007/s00270-014-0927-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 04/27/2014] [Indexed: 11/29/2022]
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de Beaufort H, Zandvoort HJ, Moll FL, Van Herwaarden JA. The Endurant stent graft for endovascular aneurysm repair. Expert Rev Med Devices 2014; 11:331-40. [DOI: 10.1586/17434440.2014.916206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Rödel SG, Zeebregts CJ, Huisman AB, Geelkerken RH. Results of the Anaconda endovascular graft in abdominal aortic aneurysm with a severe angulated infrarenal neck. J Vasc Surg 2014; 59:1495-501, 1501.e1. [DOI: 10.1016/j.jvs.2013.12.034] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 12/16/2013] [Accepted: 12/17/2013] [Indexed: 11/25/2022]
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Roos H, Ghaffari M, Falkenberg M, Chernoray V, Jeppsson A, Nilsson H. Displacement Forces in Iliac Landing Zones and Stent Graft Interconnections in Endovascular Aortic Repair: An Experimental Study. Eur J Vasc Endovasc Surg 2014; 47:262-7. [DOI: 10.1016/j.ejvs.2013.11.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/29/2013] [Indexed: 10/25/2022]
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Twine CP, Winterbottom A, Shaida N, Boyle JR. Retroperitoneal aortic hemorrhage caused by penetration of an endovascular stent-graft anchoring barb. J Endovasc Ther 2013; 20:568-70. [PMID: 23914869 DOI: 10.1583/12-4200.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE To report a rare case of acute intraoperative retroperitoneal hemorrhage secondary to aortic penetration by the suprarenal anchoring barb on a stent-graft. CASE REPORT A 75-year-old patient on dual antiplatelet therapy for coronary stents and low-molecular-weight heparin for atrial thrombus underwent elective endovascular repair of a 6.7-cm infrarenal abdominal aortic aneurysm. A device with suprarenal fixation and metal anchoring barbs was implanted, and a molding balloon was used that at no time covered the proximal bare metal stents or barbs. In recovery, the patient became tachycardic and hypotensive. After resuscitation, imaging identified an anterior barb penetrating the aortic wall, causing the acute retroperitoneal hemorrhage. A decision to treat conservatively rather than resort to open surgery was difficult but ultimately influenced by the patients' high risk for open surgery. The patient was treated by aggressive reversal of heparin and platelet transfusion, and the bleed settled spontaneously. CONCLUSION Major surgery and subsequent morbidity may be avoided by medical management of what would appear to be a surgical problem.
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Affiliation(s)
- Christopher P Twine
- Department of Vascular Surgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.
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Saratzis A, Sarafidis P, Melas N, Saratzis N, Kitas G. Impaired renal function is associated with mortality and morbidity after endovascular abdominal aortic aneurysm repair. J Vasc Surg 2013; 58:879-85. [DOI: 10.1016/j.jvs.2013.03.036] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 03/18/2013] [Accepted: 03/18/2013] [Indexed: 01/21/2023]
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Melas N, Perdikides T, Saratzis A, Lazaridis J, Saratzis N. A novel approach to minimize sealing defects: EndoAnchors reduce gutter size in an in vitro chimney graft model. J Endovasc Ther 2013; 20:506-13. [PMID: 23914860 DOI: 10.1583/13-4228c.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Nikolaos Melas
- 1st Department of Surgery, Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece.
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England A, García-Fiñana M, Fisher RK, Naik JB, Vallabhaneni SR, Brennan JA, McWilliams RG. Migration of fenestrated aortic stent grafts. J Vasc Surg 2013; 57:1543-52. [DOI: 10.1016/j.jvs.2012.12.035] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/05/2012] [Accepted: 12/09/2012] [Indexed: 11/27/2022]
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Saratzis AN, Goodyear S, Sur H, Saedon M, Imray C, Mahmood A. Acute Kidney Injury After Endovascular Repair of Abdominal Aortic Aneurysm. J Endovasc Ther 2013; 20:315-30. [DOI: 10.1583/12-4104mr2.1] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Endovascular aneurysm repair (EVAR) transformed the therapy for aortic aneurysms and introduced an era of widespread use for endovascular procedures in a variety of vascular beds. Although dramatic improvements in acute outcomes drove the early enthusiasm for EVAR, a realization that the long-term integrity of the endoprostheses used for EVAR were sometimes inferior to the results obtained with open surgical reconstruction dampened enthusiasm for their use in low-risk and younger patients who mandated long-term follow-up. While early EVAR failure modes are often related to technical aspects of the implantation, late failures are often related to the implant migrating from its original longitudinal position or losing wall apposition in the face of continued aneurysmal dilatation. Migration, or the failure of longitudinal fixation, results in gradual loss of aortic approximation and the eventual repressurization of the aneurysm sac with its attendant risks of growth and rupture. The inability of stent- and barb-based endovascular fixation to resist aortic dilatation at the site of fixation also represents a late failure mode that can result in aneurysm rupture. A variety of endostaples or endoanchors designed to replicate the function of an interrupted aortic suture have been proposed and tested to varying degrees over the years. The device designed and produced by Aptus EndoSystems, now called the HeliFx Aortic EndoAnchor is the only independent endovascular fixation device that has achieved significant clinical usage and Food and Drug Administration approval. The experience with this device is now more than 5 years and it is approved for use in the broad market across both Europe and the United States. This article will review the engineering and design concepts underlying the HeliFx device as well as the in vitro and in vivo results using this device. Finally, a discussion of the potential for technical, procedural, and endograft innovation based on the availability of endovascular suturing will be reviewed.
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Affiliation(s)
- David H Deaton
- Vascular and Endovascular Surgery, Medstar Georgetown University Hospital, Washington, DC 20007, USA.
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Georgakarakos E, Xenakis A, Manopoulos C, Georgiadis GS, Tsangaris S, Lazarides M. Geometric Factors Affecting the Displacement Forces in an Aortic Endograft With Crossed Limbs: A Computational Study. J Endovasc Ther 2013; 20:191-9. [DOI: 10.1583/1545-1550-20.2.191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Perdikides T, Melas N, Lagios K, Saratzis A, Siafakas A, Bountouris I, Kouris N, Avci M, Van den Heuvel DAF, de Vries JPPM. Primary EndoAnchoring in the Endovascular Repair of Abdominal Aortic Aneurysms With an Unfavorable Neck. J Endovasc Ther 2012; 19:707-15. [DOI: 10.1583/jevt-12-4008r.1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Mestres G, Uribe J, García-Madrid C, Miret E, Alomar X, Burrell M, Riambau V. The Best Conditions for Parallel Stenting During EVAR: An In Vitro Study. Eur J Vasc Endovasc Surg 2012; 44:468-73. [DOI: 10.1016/j.ejvs.2012.08.007] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 08/21/2012] [Indexed: 11/24/2022]
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Saratzis A, Sarafidis P, Melas N, Hunter JP, Saratzis N, Kiskinis D, Kitas GD. Suprarenal graft fixation in endovascular abdominal aortic aneurysm repair is associated with a decrease in renal function. J Vasc Surg 2012; 56:594-600. [DOI: 10.1016/j.jvs.2012.01.078] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 01/30/2012] [Accepted: 01/31/2012] [Indexed: 01/06/2023]
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Melas N, Perdikides T, Saratzis A, Saratzis N, Kiskinis D, Deaton DH. Helical EndoStaples enhance endograft fixation in an experimental model using human cadaveric aortas. J Vasc Surg 2012; 55:1726-33. [DOI: 10.1016/j.jvs.2011.11.048] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 11/02/2011] [Accepted: 11/05/2011] [Indexed: 11/27/2022]
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Anemia is Associated With Mortality Following Endovascular Repair of Abdominal Aortic Aneurysm. Vasc Endovascular Surg 2012; 46:223-8. [DOI: 10.1177/1538574412442251] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Aim: The aim of this study was to compare midterm mortality between anemic and nonanemic patients undergoing endovascular repair of abdominal aortic aneurysm and to assess a correlation with markers of inflammation. Methods: Anemia was defined as hemoglobin <13 (men) and <12 g/dL (women). The impact of anemia and inflammatory markers on mortality was assessed using Kaplan-Meier curves and Cox regression. Results: A total of 224 patients (12 females [5.36%]; age: 69.73 ± 8.72 years) were included; 102 (45.53%) were anemic. Median follow-up was 17 months (interquartile range: 7-25 months). Nine patients died (1.79%; 8 anemic vs 1 nonanemic). Survival was lower for patients with anemia (log-rank, P = .01). White blood cell count and C-reactive protein (CRP) differed significantly ( P < .001 and P = .01). Anemia and CRP were associated with decreased survival (Cox regression, P = .01, hazard ratio [HR]: 0.35, 95% confidence interval: 0.14-0.84 and P = .002, HR: 1.18, 95% CI: 1.06-1.31). Conclusion: Patients with anemia had decreased survival over the midterm; inflammatory markers were higher among this group.
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