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Evaluation of coronary stents: A review of types, materials, processing techniques, design, and problems. Heliyon 2023; 9:e13575. [PMID: 36846695 PMCID: PMC9950843 DOI: 10.1016/j.heliyon.2023.e13575] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 01/22/2023] [Accepted: 02/02/2023] [Indexed: 02/11/2023] Open
Abstract
In the world, one of the leading causes of death is coronary artery disease (CAD). There are several ways to treat this disease, and stenting is currently the most appropriate way in many cases. Nowadays, the use of stents has rapidly increased, and they have been introduced in various models, with different geometries and materials. To select the most appropriate stent required, it is necessary to have an analysis of the mechanical behavior of various types of stents. The purpose of this article is to provide a complete overview of advanced research in the field of stents and to discuss and conclude important studies on different topics in the field of stents. In this review, we introduce the types of coronary stents, materials, stent processing technique, stent design, classification of stents based on the mechanism of expansion, and problems and complications of stents. In this article, by reviewing the biomechanical studies conducted in this field and collecting and classifying their results, a useful set of information has been presented to continue research in the direction of designing and manufacturing more efficient stents, although the clinical-engineering field still needs to continue research to optimize the design and construction. The optimum design of stents in the future is possible by simulation and using numerical methods and adequate knowledge of stent and artery biomechanics.
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Vallejo-Zamora JA, Vega-Cantu YI, Rodriguez C, Cordell GA, Rodriguez-Garcia A. Drug-Eluting, Bioresorbable Cardiovascular Stents─Challenges and Perspectives. ACS APPLIED BIO MATERIALS 2022; 5:4701-4717. [PMID: 36150217 DOI: 10.1021/acsabm.2c00551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Globally, the leading causes of natural death are attributed to coronary heart disease and type 1 and type 2 diabetes. High blood pressure levels, high cholesterol levels, smoking, and poor eating habits lead to the agglomeration of plaque in the arteries, reducing the blood flow. The implantation of devices used to unclog vessels, known as stents, sometimes results in a lack of irrigation due to the excessive proliferation of endothelial tissue within the blood vessels and is known as restenosis. The use of drug-eluting stents (DESs) to deliver antiproliferative drugs has led to the development of different encapsulation techniques. However, due to the potency of the drugs used in the initial stent designs, a chronic inflammatory reaction of the arterial wall known as thrombosis can cause a myocardial infarction (MI). One of the most promising drugs to reduce this risk is everolimus, which can be encapsulated in lipid systems for controlled release directly into the artery. This review aims to discuss the current status of stent design, fabrication, and functionalization. Variables such as the mechanical properties, metals and their alloys, drug encapsulation and controlled elution, and stent degradation are also addressed. Additionally, this review covers the use of polymeric surface coatings on stents and the recent advances in layer-by-layer coating and drug delivery. The advances in nanoencapsulation techniques such as liposomes and micro- and nanoemulsions and their functionalization in bioresorbable, drug-eluting stents are also highlighted.
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Affiliation(s)
- Julio A Vallejo-Zamora
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, Nuevo León64849, Mexico
| | - Yadira I Vega-Cantu
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, Nuevo León64849, Mexico
| | - Ciro Rodriguez
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, Nuevo León64849, Mexico
- Laboratorio Nacional de Manufactura Aditiva y Digital (MADIT), Apodaca, Nuevo León66629, Mexico
| | - Geoffrey A Cordell
- Natural Products, Inc., Evanston, Illinois60201, United States
- College of Pharmacy, University of Florida, Gainesville, Florida32610, United States
| | - Aida Rodriguez-Garcia
- Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, Nuevo León64849, Mexico
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Instituto de Biotecnología, Ciudad Universitaria, Ave. Pedro de Alba S/N, San Nicolás de los Garza, Nuevo León66455, Mexico
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Sweid A, Sajja KC, Mouchtouris N, Weinberg JH, Shivashankar K, Saad H, Abbas R, El Naamani K, Ramesh S, Schaefer J, Saiegh FA, Jabbour P, Herial NA, Zarzour H, Tjoumakaris S, Romo V, Rosenwasser RH, Gooch MR. Rescue stenting for acute ischemic stroke with Refractory Emergent Large vessel occlusion in the modern thrombectomy era. Clin Neurol Neurosurg 2022; 215:107183. [DOI: 10.1016/j.clineuro.2022.107183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 01/20/2022] [Accepted: 02/19/2022] [Indexed: 11/03/2022]
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Huang H, Wu L, Guo Y, Zhang Y, Zhao J, Yu Z, Luo X. Treatment of the Carotid In-stent Restenosis: A Systematic Review. Front Neurol 2021; 12:748304. [PMID: 34671314 PMCID: PMC8521022 DOI: 10.3389/fneur.2021.748304] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 09/08/2021] [Indexed: 11/13/2022] Open
Abstract
Background and Purpose: In-stent restenosis (ISR) after carotid artery stent (CAS) is not uncommon. We aimed to evaluate therapeutic options for ISR after CAS. Methods: We searched PubMed and EMBASE until November 2, 2020 for studies including the treatment for ISR after CAS. Results: In total, 35 studies, covering 1,374 procedures in 1,359 patients, were included in this review. Most cases (66.3%) were treated with repeat CAS (rCAS), followed by percutaneous transluminal angioplasty (PTA) (17.5%), carotid endarterectomy (CEA) (14.3%), carotid artery bypass (1.5%), and external beam radiotherapy (0.4%). The rates of stroke & TIA within the postoperative period were similar in three groups (PTA 1.1%, rCAS 1.1%, CEA 1.5%). CEA (2.5%) was associated with a slightly higher rate of postoperative death than rCAS (0.7%, P = 0.046). Furthermore, the rate of long-term stroke & TIA in PTA was 5.7%, significantly higher than rCAS (1.8%, P = 0.036). PTA (27.8%) was also associated with a significantly higher recurrent restenosis rate than rCAS (8.2%, P = 0.002) and CEA (1.6%, P < 0.001). The long-term stroke & TIA and recurrent restenosis rates showed no significant difference between rCAS and CEA. Conclusions: rCAS is the most common treatment for ISR, with low postoperative risk and low long-term risk. CEA is an important alternative for rCAS. PTA may be less recommended due to the relatively high long-term risks of stroke & TIA and recurrent restenosis.
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Affiliation(s)
- Hao Huang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lingshan Wu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yinping Guo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yi Zhang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jing Zhao
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhiyuan Yu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiang Luo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Fuse Y, Tajima H, Nakamura S, Kurimoto F, Watanabe K. Prevention of Stroke with Closed-Cell Stent-in-Stent for Carotid Artery Stenosis Due to Stent Fracture. JOURNAL OF NEUROENDOVASCULAR THERAPY 2021; 16:52-55. [PMID: 37502023 PMCID: PMC10370623 DOI: 10.5797/jnet.cr.2020-0213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/31/2021] [Indexed: 07/29/2023]
Abstract
Objective Stent fracture is a risk factor for stroke. It has not been fully elucidated whether stent-in-stent procedures can effectively treat stent fractures. Case Presentation An 80-year-old man underwent carotid artery stenting (CAS) with an open-cell stent to treat asymptomatic right internal carotid artery (ICA) stenosis. Type III stent fracture occurred during CAS. Six months later, in-stent stenosis progressed on DSA. Repeat CAS with a closed-cell stent was performed. CT showed expansion of the narrowed lumen. The patient remained stroke-free and carotid artery restenosis did not occur for 3 years postoperatively. Conclusion Repeat CAS with a closed-cell stent is a viable treatment option for stent fracture.
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Affiliation(s)
- Yutaro Fuse
- Department of Neurosurgery, Handa City Hospital, Handa, Aichi, Japan
| | - Hayato Tajima
- Department of Neurosurgery, Handa City Hospital, Handa, Aichi, Japan
| | | | - Futoshi Kurimoto
- Department of Neurosurgery, Handa City Hospital, Handa, Aichi, Japan
| | - Kazuhiko Watanabe
- Department of Neurosurgery, Handa City Hospital, Handa, Aichi, Japan
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Müller MD, Bonati LH. Carotid artery stenosis – Current evidence and treatment recommendations. CLINICAL AND TRANSLATIONAL NEUROSCIENCE 2021. [DOI: 10.1177/2514183x211001654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: Carotid artery stenosis is an important cause for stroke. Carotid endarterectomy (CEA) reduces the risk of stroke in patients with symptomatic carotid stenosis and to some extent in patients with asymptomatic carotid stenosis. More than 20 years ago, carotid artery stenting (CAS) emerged as an endovascular treatment alternative to CEA. Objective and Methods: This review summarises the available evidence from randomised clinical trials in patients with symptomatic as well as in patients with asymptomatic carotid stenosis. Results: CAS is associated with a higher risk of death or any stroke between randomisation and 30 days after treatment than CEA (odds ratio (OR) = 1.74, 95% CI 1.3 to 2.33, p < 0.0001). In a pre-defined subgroup analysis, the OR for stroke or death within 30 days after treatment was 1.11 (95% CI 0.74 to 1.64) in patients <70 years old and 2.23 (95% CI 1.61 to 3.08) in patients ≥70 years old, resulting in a significant interaction between patient age and treatment modality (interaction p = 0.007). The combination of death or any stroke up to 30 days after treatment or ipsilateral stroke during follow-up also favoured CEA (OR = 1.51, 95% CI 1.24 to 1.85, p < 0.0001). In asymptomatic patients, there is a non-significant increase in death or stroke occurring within 30 days of treatment with CAS compared to CEA (OR = 1.72, 95% CI 1.00 to 2.97, p = 0.05). The risk of peri-procedural death or stroke or ipsilateral stroke during follow-up did not differ significantly between treatments (OR = 1.27, 95% CI 0.87 to 1.84, p = 0.22). Discussion and Conclusion: In symptomatic patients, randomised evidence has consistently shown CAS to be associated with a higher risk of stroke or death within 30 days of treatment than CEA. This extra risk is mostly attributed to an increase in strokes occurring on the day of the procedure in patients ≥70 years. In asymptomatic patients, there may be a small increase in the risk of stroke or death within 30 days of treatment with CAS compared to CEA, but the currently available evidence is insufficient and further data from ongoing randomised trials are needed.
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Affiliation(s)
- Mandy D Müller
- Department of Neurology and Stroke Center, University Hospital Basel, University of Basel, Basel, Switzerland
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Leo H Bonati
- Department of Neurology and Stroke Center, University Hospital Basel, University of Basel, Basel, Switzerland
- Department of Brain Repair and Rehabilitation, Stroke Research Centre, UCL Institute of Neurology, University College London, London, UK
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Kim KA, Choi SY, Kim R. Endovascular Treatment for Lower Extremity Deep Vein Thrombosis: An Overview. Korean J Radiol 2021; 22:931-943. [PMID: 33660456 PMCID: PMC8154777 DOI: 10.3348/kjr.2020.0675] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/07/2020] [Accepted: 09/17/2020] [Indexed: 11/17/2022] Open
Abstract
Lower extremity deep vein thrombosis (DVT) is a serious medical condition that can result in local pain and gait disturbance. DVT progression can also lead to death or major disability as a result of pulmonary embolism, postthrombotic syndrome, or limb amputation. However, early thrombus removal can rapidly relieve symptoms and prevent disease progression. Various endovascular procedures have been developed in the recent years to treat DVT, and endovascular treatment has been established as one of the major therapeutic methods to treat lower extremity DVT. However, the treatment of lower extremity DVT varies according to the disease duration, location of affected vessels, and the presence of symptoms. This article reviews and discusses effective endovascular treatment methods for lower extremity DVT.
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Affiliation(s)
- Kyung Ah Kim
- Department of Radiology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
| | - Sun Young Choi
- Department of Radiology and Medical Research Institute, School of Medicine, Ewha Womans University, Seoul, Korea.
| | - Ran Kim
- Department of Radiology and Medical Research Institute, School of Medicine, Ewha Womans University, Seoul, Korea
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Beeman BR, Kuhn BA, Recht MH, Muck PE, Schneider PA. Duplex Ultrasound Surveillance after Transcarotid Artery Revascularization (TCAR) in Clinical Practice. Ann Vasc Surg 2020; 72:330-339. [PMID: 33245990 DOI: 10.1016/j.avsg.2020.09.065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 09/25/2020] [Accepted: 09/27/2020] [Indexed: 11/25/2022]
Abstract
BACKGROUND To propose a protocol for the routine clinical use of duplex ultrasound (DUS) assessment after transcarotid artery revascularization (TCAR) procedures, with its specific point of vascular access, based on DUS data from routine clinical practice. METHODS DUS data were retrospectively collected at 2 centers from a total of 97 patients who underwent a TCAR procedure with at least 30-day and up to 12-month follow-up. Peak systolic velocity (PSV), end diastolic velocity (EDV), and the internal carotid artery (ICA)/common carotid artery (CCA) PSV ratio were collected at baseline (≤30 days after the procedure) and compared with subsequent measurements. RESULTS Baseline data were established within 30 days after the procedure. There were no access site stenoses, pseudoaneurysms, or dissections detected in follow-up. Average hemodynamics measurements at 12 months after the procedure (36% of patients reached this time point to date) were PSV 167 ± 153 cm/sec, EDV 51 ± 55 cm/sec, and ICA/CCA PSV 2.3 ± 1.9. Five patients (5.2%) exhibited velocities indicative of ≥80% in-stent restenosis (ISR) at 12 months after the procedure. Two patients (2.1%) underwent repeat intervention for ISR based on high velocities and before significant clinical consequence. The other 3 patients (3.1%) were asymptomatic and are being managed medically and monitored for neurological symptoms. One intraprocedural stroke (1.0% of total treated) was observed. CONCLUSIONS This protocol not only illustrates the utility of using the CCA for the arterial access sheath for carotid stenting, but also successfully identifies patients with clinically significant restenosis >80%-99%. A surveillance regimen of baseline at ≤30 days after the procedure, followed by assessment at 6 and 12 months, and yearly thereafter appears to be a safe and effective protocol, based on the data available to date. A PSV >340 cm/sec and ICA/CCA ratio >4.15 is consistent with an 80-99% restenosis after TCAR. Although a small number, this study serves as a starting point for those who perform TCAR to specifically look at the CCA access site to rule out these potential pitfalls which did occur in the early trials.
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Affiliation(s)
- Brian R Beeman
- Carle Heart and Vascular Institute, Carle Foundation Hospital, Urbana, IL.
| | - Brian A Kuhn
- TriHealth/Good Samaritan Hospital, Cincinnati, OH
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Mutzenbach JS, Griessenauer CJ, Broussalis E, Pikija S, Moscote-Salazar LR, Millesi K, Bubel N, Rösler C, Killer-Oberpfalzer M. Follow-up after carotid stenting with the CASPER stent system: A duplex ultrasound evaluation. J Vasc Surg 2020; 72:2054-2060.e2. [PMID: 32325231 DOI: 10.1016/j.jvs.2020.03.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 03/13/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE To report results of duplex ultrasound evaluation of consecutive patients after carotid stenting with the double layer Carotid Artery Stent designed to Prevent Embolic Release (CASPER) stent system. METHODS Between January 2014 and June 2017, a single-center, retrospective study of 101 consecutive patients (21.8% female; median age, 72.1 years) was performed. Patients with internal carotid artery stenosis treated with the CASPER stent were included. Eligibility criteria for stenting included stenosis of ≥70% of the vessel diameter (or ≥50% diameter with ulceration) in symptomatic carotid artery stenosis or ≥80% stenosis in asymptomatic patients at the carotid artery bifurcation or the proximal cervical internal carotid artery. Duplex ultrasound examination was performed before and within 24 hours of implantation as well as at 14 days, and 3, 6, and 12 months. RESULTS At the 12-month follow-up visit, moderate in-stent restenosis (ISR) (≥50% and <70%) was detected in three stents (2.8%) and severe (≥70%) ISR in two (1.9%; including one case of stent occlusion). All but the two latter patients remained asymptomatic during the follow-up period. One patient required retreatment for ISR after a minor stroke and another patient with stent occlusion also re-presented with a minor stroke. Multivariable logistic regression was unable to detect any significant factors associated with ISR. CONCLUSIONS Duplex ultrasound examination after carotid stenting is a useful tool for patient follow-up and determination of ISR. We found a low incidence of ISR assessed by duplex ultrasound examination at 12 months after CASPER stenting, but further studies are warranted.
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Affiliation(s)
| | - Christoph Johannes Griessenauer
- Department of Neurosurgery, Geisinger, Danville, Pa; Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria
| | - Erasmia Broussalis
- Department of Neurology, Paracelsus Medical University, Salzburg, Austria; Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria
| | - Slaven Pikija
- Department of Neurology, Paracelsus Medical University, Salzburg, Austria
| | | | - Katharina Millesi
- Department of Neurology, Krankenanstalt Rudolfstiftung, Wien, Austria
| | - Nele Bubel
- Department of Neurology, Paracelsus Medical University, Salzburg, Austria
| | - Cornelia Rösler
- Department of Neurology, Paracelsus Medical University, Salzburg, Austria
| | - Monika Killer-Oberpfalzer
- Department of Neurology, Paracelsus Medical University, Salzburg, Austria; Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria.
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de Vries EE, Meershoek AJA, Vonken EJ, den Ruijter HM, van den Berg JC, de Borst GJ. A meta-analysis of the effect of stent design on clinical and radiologic outcomes of carotid artery stenting. J Vasc Surg 2019; 69:1952-1961.e1. [PMID: 31159989 DOI: 10.1016/j.jvs.2018.11.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 11/10/2018] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Procedural characteristics, including stent design, may influence the outcome of carotid artery stenting (CAS). A thorough comparison of the effect of stent design on outcome of CAS is thus warranted to allow for optimal evidence-based clinical decision making. This study sought to evaluate the effect of stent design on clinical and radiologic outcomes of CAS. METHODS A systematic search was conducted in MEDLINE, Embase, and Cochrane databases in May 2018. Included were articles reporting on the occurrence of clinical short- and intermediate-term major adverse events (MAEs; any stroke or death) or radiologic adverse events (new ischemic lesions on postprocedural magnetic resonance diffusion-weighted imaging [MR-DWI], restenosis, or stent fracture) in different stent designs used to treat carotid artery stenosis. Random effects models were used to calculate combined overall effect sizes. Metaregression was performed to identify the effect of specific stents on MAE rates. RESULTS From 2654 unique identified articles, two randomized, controlled trials and 66 cohort studies were eligible for analysis (including 46,728 procedures). Short-term clinical MAE rates were similar for patients treated with open cell vs closed cell or hybrid stents. Use of an Acculink stent was associated with a higher risk of short-term MAE compared with a Wallstent (risk ratio [RR], 1.51; P = .03), as was true for use of Precise stent vs Xact stent (RR, 1.55; P < .001). Intermediate-term clinical MAE rates were similar for open vs closed cell stents. Use of open cell stents predisposed to a 25% higher chance (RR, 1.25; P = .03) of developing postprocedural new ischemic lesions on MR-DWI. No differences were observed in the incidence of restenosis, stent fracture, or intraprocedural hemodynamic depression with respect to different stent design. CONCLUSIONS Stent design is not associated with short- or intermediate-term clinical MAE rates in patients undergoing CAS. Furthermore, the division in open and closed cell stent design might conceal true differences in single stent efficacy. Nevertheless, open cell stenting resulted in a significantly higher number of subclinical postprocedural new ischemic lesions detected on MR-DWI compared with closed cell stenting. An individualized patient data meta-analysis, including future studies with prospective homogenous study design, is required to adequately correct for known risk factors and to provide definite conclusions with respect to carotid stent design for specific subgroups.
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Affiliation(s)
- Evelien E de Vries
- Department of Vascular Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Armelle J A Meershoek
- Department of Vascular Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Evert J Vonken
- Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Hester M den Ruijter
- Experimental Cardiology Laboratory, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Jos C van den Berg
- Centro Vascolare Ticino, Ospedale Regionale di Lugano, Lugano, Switzerland; Universitätsinstitut für Diagnostische, Interventionelle und Pädiatrische Radiologie, Inselspital, University of Bern, Bern, Switzerland
| | - Gert J de Borst
- Department of Vascular Surgery, University Medical Center Utrecht, Utrecht, The Netherlands.
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Müller MD, Gregson J, McCabe DJH, Nederkoorn PJ, van der Worp HB, de Borst GJ, Cleveland T, Wolff T, Engelter ST, Lyrer PA, Brown MM, Bonati LH. Stent Design, Restenosis and Recurrent Stroke After Carotid Artery Stenting in the International Carotid Stenting Study. Stroke 2019; 50:3013-3020. [PMID: 31547798 DOI: 10.1161/strokeaha.118.024076] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background and Purpose- Open-cell carotid artery stents are associated with a higher peri-procedural stroke risk than closed-cell stents. However, the effect of stent design on long-term durability of carotid artery stenting (CAS) is unknown. We compared the medium- to long-term risk of restenosis and ipsilateral stroke between patients treated with open-cell stents versus closed-cell stents in the ICSS (International Carotid Stenting Study). Methods- Patients with symptomatic carotid stenosis were randomized to CAS or endarterectomy and followed with duplex ultrasound for a median of 4.0 years. We analyzed data from patients with completed CAS procedures, known stent design, and available ultrasound follow-up. The primary outcome, moderate or higher restenosis (≥50%) was defined as a peak systolic velocity of >1.3 m/s on ultrasound or occlusion of the treated internal carotid artery and analyzed with interval-censored models. Results- Eight hundred fifty-five patients were allocated to CAS. Seven hundred fourteen patients with completed CAS and known stent design were included in the current analysis. Of these, 352 were treated with open-cell and 362 with closed-cell stents. Moderate or higher restenosis occurred significantly less frequently in patients treated with open-cell (n=113) than closed-cell stents (n=154; 5-year risks were 35.5% versus 46.0%; unadjusted hazard ratio, 0.68; 95% CI, 0.53-0.88). There was no significant difference in the risk of severe restenosis (≥70%) after open-cell stenting (n=27) versus closed-cell stenting (n=43; 5-year risks, 8.6% versus 12.7%; unadjusted hazard ratio, 0.63; 95% CI, 0.37-1.05). The risk of ipsilateral stroke beyond 30 days after treatment was similar with open-cell and closed-cell stents (hazard ratio, 0.78; 95% CI, 0.35-1.75). Conclusions- Moderate or higher restenosis after CAS occurred less frequently in patients treated with open-cell stents than closed-cell stents. However, both stent designs were equally effective at preventing recurrent stroke during follow-up. Clinical Trial Registration- URL: http://www.isrctn.com/. Unique identifier: ISRCTN25337470.
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Affiliation(s)
- Mandy D Müller
- From the Department of Neurology and Stroke Center (M.D.M., S.T.E., P.A.L., L.H.B.)
| | - John Gregson
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, United Kingdom (J.G.)
| | - Dominick J H McCabe
- Vascular Neurology Research Foundation, Department of Neurology and Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Dublin/Tallaght University Hospital, Ireland; Irish Center for Vascular Biology, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland (D.J.H.M.).,Department of Clinical Neurosciences, Royal Free Campus (D.J.H.M.), UCL Institute of Neurology, London, United Kingdom
| | - Paul J Nederkoorn
- Department of Neurology, Amsterdam University Medical Center, the Netherlands (P.J.N.)
| | - H Bart van der Worp
- Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus (H.B.v.d.W.), University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Gert J de Borst
- Department of Vascular Surgery (G.J.d.B.), University Medical Center Utrecht, Utrecht University, the Netherlands
| | - Trevor Cleveland
- Sheffield Vascular Institute, Sheffield Teaching Hospitals NHS Foundation Trust, United Kingdom (T.C.)
| | - Thomas Wolff
- Department of Vascular Surgery (T.W.), University of Basel, Switzerland
| | - Stefan T Engelter
- From the Department of Neurology and Stroke Center (M.D.M., S.T.E., P.A.L., L.H.B.).,University Hospital Basel and Neurorehabilitation Unit, University Center for Medicine of Aging and Rehabilitation Basel, Felix Platter Hospital (S.T.E.), University of Basel, Switzerland
| | - Philippe A Lyrer
- From the Department of Neurology and Stroke Center (M.D.M., S.T.E., P.A.L., L.H.B.)
| | | | - Leo H Bonati
- From the Department of Neurology and Stroke Center (M.D.M., S.T.E., P.A.L., L.H.B.).,Stroke Research Center, Department of Brain Repair and Rehabilitation (L.H.B.), UCL Institute of Neurology, London, United Kingdom
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A Review on the Comparison of Different Treatments for Carotid In-Stent Restenosis. Can J Neurol Sci 2019; 46:666-681. [DOI: 10.1017/cjn.2019.277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
ABSTRACT:Different treatment options for carotid in-stent restenosis (ISR) have been reported with good outcome, including carotid endarterectomy (CEA), repeated carotid angioplasty stenting (CAS) and percutaneous transluminal angioplasty (PTA) with drug-coated balloons (DCBs). However, the optimal treatment option for ISR has not yet been determined. A systematic literature search was performed in the databases of Medline, Embase, Cochrane library, and unpublished data from clinicaltrials.gov from 1990 to March 1, 2019. Studies were enrolled if they reported treatment strategies for carotid ISR treatment and met the inclusion criteria. After study inclusions, data were extracted and summarized. Totally 25 cross-sectional studies were included, containing 5 comparative studies, 16 studies using repeated PTA, and 4 studies adopting CEA treatment. Our study summarized the current available data, showing that all the studies could effectively relieve the carotid ISR by significantly improving the angiographic stenosis and decreasing the peak systolic velocity values. Meanwhile, CEA treatment had the best long-term effects in relieving restenosis, while re-PTA with stenting/balloon angioplasty had a certain rate of restenosis, ranging from 33% to 83%. Furthermore, re-PTA/stenting and balloon angioplasty treatment had less complications compared with CEA. Also, we analyzed the risk factors that might affect the long-term prognosis of carotid ISR patients. The therapeutic measures for carotid ISR had their own features, with CEA had the highest efficacy while re-PTA/stenting and balloon angioplasty were with less complications. More large-scale comparative clinical studies are needed to further ascertain the best strategies.
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Yao X, Dai Z, Zhang X, Gao J, Xu G, Cai Y, Li Z. Carotid Geometry as a Predictor of In-Stent Neointimal Hyperplasia - A Computational Fluid Dynamics Study. Circ J 2019; 83:1472-1479. [PMID: 31061352 DOI: 10.1253/circj.cj-18-1152] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Carotid angioplasty and stenting (CAS) is emerging as an alternative treatment for carotid stenosis, but neointimal hyperplasia (NIH) remains a drawback of this treatment strategy. This study aimed to evaluate the effect of variations of carotid bifurcation geometry on local hemodynamics and NIH.Methods and Results:Hemodynamic and geometric effects on NIH were compared between 2 groups, by performing computational fluid dynamics (CFD) simulations both on synthetic models and patient-specific models. In the idealized models, multiple regression analysis revealed a significant negative relationship between internal carotid artery (ICA) angle and the local hemodynamics. In the patient-derived models, which were reconstructed from digital subtraction angiography (DSA) of 25 patients with bilateral CAS, a low time-average wall shear stress (TAWSS) and a high oscillatory shear index (OSI) were often found at the location of NIH. Larger difference values of the OSI percentage area (10.56±20.798% vs. -5.87±18.259%, P=0.048) and ECA/CCA diameter ratio (5.64±12.751% vs. -3.59±8.697%, P=0.047) were detected in the NIH-asymmetric group than in the NIH-symmetric group. CONCLUSIONS Changes in carotid bifurcation geometry can make apparent differences in hemodynamic distribution and lead to bilateral NIH asymmetry. It may therefore be reasonable to consider certain geometric variations as potential local risk factors for NIH.
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Affiliation(s)
- Xinke Yao
- School of Biological Science & Medical Engineering, Southeast University
| | - Zhengze Dai
- Department of Neurology, Jinling Clinical College of Nanjing Medical University.,Department of Neurology, Nanjing Pukou Hospital
| | - Xu Zhang
- School of Biological Science & Medical Engineering, Southeast University
| | - Jie Gao
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University
| | - Gelin Xu
- Department of Neurology, Jinling Clinical College of Nanjing Medical University.,Department of Neurology, Jinling Hospital, Medical School of Nanjing University
| | - Yan Cai
- School of Biological Science & Medical Engineering, Southeast University
| | - Zhiyong Li
- School of Biological Science & Medical Engineering, Southeast University.,School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology
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Lee HJ, Chang FC, Luo CB, Guo WY. Influence of stenting with open-cell stents vs close-cell stents on the outcomes of patients with bilateral carotid stenosis. J Chin Med Assoc 2019; 82:66-71. [PMID: 30839407 DOI: 10.1097/jcma.0000000000000006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Carotid artery stenting (CAS) is an effective way to prevent stroke in patients with severe carotid stenosis. However, several studies comparing the outcomes of stenting with open-cell stents (OCS) vs closed-cell stents (CCS) have yielded inconclusive results. This study aimed to compare the outcomes of CAS with OCS vs CCS in the same patients. METHODS From year 2000 to 2016, we included 52 patients with severe bilateral carotid stenosis who underwent OCS deployment in one artery and CCS deployment in the contralateral artery. Stents were selected according to arterial anatomy and lesion morphology, and the peri-procedural and long-term outcomes of treatment with OCS vs CCS, were compared in terms of rates of ischemic spot development on early post-procedural diffusion-weighted imaging (ISDWI), in-stent restenosis (ISR), and recurrent stroke. RESULTS After stenting with OCS vs CCS, the number (rate) of arteries with no lesion, < 5 lesions, and ≥ 5 lesions on DWI was 9 (32%) vs 8 (27%), 8 (29%) vs 17 (57%), and 11 (39%) vs 5 (17%) (p = .10); number (rate) of arteries with 0%, < 50%, and >50% ISR was 34 (65%) vs 34 (65%), 9 (17%) vs 11 (21%), and 9 (17%) vs 7 (13%) (p = .71); number (rate) of recurrent strokes after CAS was 2 (4%) vs 0 (0%). CONCLUSION The rates of peri-procedural cerebral ischemic insult, long-term stent patency, and stroke recurrence indicate that no one carotid stent cell design is superior to the other. We suggest both OCS and CCS are reasonable options for the treatment of severe carotid stenosis.
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Affiliation(s)
- Han-Jui Lee
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Feng-Chi Chang
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Chao-Bao Luo
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Wan-Yuo Guo
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
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15
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Campos JK, Lin LM, Beaty NB, Bender MT, Jiang B, Zarrin DA, Coon AL. Tandem cervical carotid stenting for stenosis with flow diversion embolisation for the treatment of intracranial aneurysms. Stroke Vasc Neurol 2018; 4:43-47. [PMID: 31105978 PMCID: PMC6475085 DOI: 10.1136/svn-2018-000187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 10/06/2018] [Accepted: 11/12/2018] [Indexed: 11/15/2022] Open
Abstract
Background An estimated 2%–3% of the population harbour an intracranial aneurysm. Concomitant atherosclerotic cervical carotid disease is not uncommon. The management of these two entities remains a challenge within the field. Case presentation We report a single case of concomitant carotid stenosis and two ipsilateral unruptured intracranial aneurysms treated with a single-staged cervical carotid stenting and cerebral aneurysm embolisation with the Pipeline embolisation device. Discussion No consensus currently exists to guide endovascular treatment of intracranial aneurysms associated with asymptomatic ipsilateral stenosis. Here, we present a case of asymptomatic moderate carotid stenosis with two ipsilateral intracranial aneurysms and suggest carotid artery stenting takes procedural priority over aneurysm embolisation in single-stage treatment. The rationale for the sequence of neurointerventions is based on the tracking a robust distal access system beyond a stenotic proximal carotid lesion and stabilisation of the ulcerated plaque to avoid thromboembolic complications associated with plaque irritation during aneurysm embolisation. Additional cases and longer follow-up will be needed to further assess the efficacy of this technique.
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Affiliation(s)
- Jessica K Campos
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Li-Mei Lin
- Department of Neurosurgery, University of California, Irvine, Orange, California, USA
| | - Narlin B Beaty
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Matthew T Bender
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Bowen Jiang
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - David A Zarrin
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alexander L Coon
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Texakalidis P, Giannopoulos S, Kokkinidis DG, Lanzino G. Effect of Open- vs Closed-Cell Stent Design on Periprocedural Outcomes and Restenosis After Carotid Artery Stenting: A Systematic Review and Comprehensive Meta-analysis. J Endovasc Ther 2018; 25:523-533. [DOI: 10.1177/1526602818783505] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
Purpose:To compare periprocedural complications and in-stent restenosis rates associated with open- vs closed-cell stent designs used in carotid artery stenting (CAS). Methods: A systematic search was conducted to identify all randomized and observational studies published in English up to October 31, 2017, that compared open- vs closed-cell stent designs in CAS. Identified studies were included if they reported the following outcomes: stroke, transient ischemic attack (TIA), myocardial infarction (MI), hemodynamic depression, new ischemic lesions detected on imaging, and death within 30 days, as well as the incidence of in-stent restenosis. A random-effects model meta-analysis was employed. Model results are reported as the odds ratio (OR) and 95% confidence interval (CI). The I2 statistic was used to assess heterogeneity. Results: Thirty-three studies (2 randomized trials) comprising 20, 291 patients (mean age 71.3±3.0 years; 74.6% men) were included. Patients in the open-cell stent group had a statistically significant lower risk of restenosis ⩾40% (OR 0.42, 95% CI 0.19 to 0.92; I2=0%) and ⩾70% (OR 0.23, 95% CI 0.10 to 0.52; I2=0%) at a mean follow-up of 24 months. No statistically significant differences were identified for periprocedural stroke, TIA, new ischemic lesions, MI, hemodynamic depression, or death within 30 days after CAS. Sensitivity analysis of the 2 randomized controlled trials only did not point to any significant differences either. Conclusion: Use of open-cell stent design in CAS is associated with a decreased risk for restenosis when compared to the closed-cell stent, without significant differences in periprocedural outcomes.
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Affiliation(s)
- Pavlos Texakalidis
- Department of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA
- Aristotle University of Thessaloniki, Greece
| | | | - Damianos G. Kokkinidis
- Department of Medicine, Jacobi Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Giuseppe Lanzino
- Department of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA
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17
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Mutzenbach SJ, Millesi K, Roesler C, Broussalis E, Pikija S, Sellner J, Machegger L, Griessenauer CJ, Killer-Oberpfalzer M. The Casper Stent System for carotid artery stenosis. J Neurointerv Surg 2018; 10:869-873. [DOI: 10.1136/neurintsurg-2017-013583] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/19/2017] [Accepted: 12/24/2017] [Indexed: 01/31/2023]
Abstract
PurposeTo report the results of a retrospective analysis of prospectively collected data evaluating the safety and efficacy of a double layer stent engineered for carotid artery occlusive disease.MethodsBetween January 2014 and February 2017, 138 patients (25.4% women; median age 71 years) underwent Casper stent implantation for carotid artery stenosis. Eligibility criteria included stenosis >70% of vessel diameter (or >50% diameter with ulceration) in symptomatic patients or asymptomatic patients with >80% stenosis at the carotid bifurcation or in the proximal internal carotid artery. For all procedures, a distal embolic protection device was used. The primary endpoint was the rate of 90 day major adverse neurological events, defined as minor stroke, major stroke, or death by independent neurological assessment.ResultsStent deployment was completed successfully in all cases without documented technical failure. There were no adverse neurological events or mortalities within 90 days. One thromboembolic occlusion of a small distal branch of the anterior cerebral artery occurred during the procedure and resolved with systemic recombinant tissue plasminogen activator administration. New ischemic lesions, all clinically silent, were seen in 6.5% of patients on post-procedure cerebral MRI.ConclusionThe Casper carotid stent demonstrated safety and efficacy in the treatment of carotid stenosis, with no technical failures and no adverse neurological events seen throughout the 90 day follow-up period. Its double layer structure seems to combine adequate plaque scaffolding with high vessel adaptability.
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18
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Zhang P, Chen D, Tian D, Zhang Q, Wang M, Li Q, Luo X. Simultaneous Kissing Stenting: A Valuable Technique for Reconstructing the Stenotic Initial Segment of the Right Subclavian Artery. INTERVENTIONAL NEUROLOGY 2017; 6:65-72. [PMID: 28611836 DOI: 10.1159/000455288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Accepted: 12/22/2016] [Indexed: 11/19/2022]
Abstract
Atherosclerotic stenosis or occlusion often involves the subclavian artery. For lesions that are close to the orifice of the right subclavian artery, stenting of the right subclavian artery itself blocks the pathway from the innominate artery to the right carotid artery and causes problems in patients with multiple angiostenosis, especially involving the right carotid system. In this study, we report 2 cases using simultaneous kissing stenting (SKS) of the right subclavian artery and the right carotid artery to relieve right subclavian stenosis and maintain right carotid system patency. Standard stenting methods were used to perform SKS. Two self-expanding stents were implanted simultaneously into the initial segment of the right subclavian artery and the right carotid artery, forming a "Y" shape, with the overlap of the proximal segments in the innominate artery ≥5 mm. After SKS, the stenosed right subclavian artery was dilated, and the patency of the right carotid system was maintained. The symptoms of patients were relieved and the stents were intact at several months of follow-up. In conclusion, SKS of the right subclavian artery and the right carotid artery might be a safe and effective procedure when the stenotic or occlusive lesion in the initial segment of the right subclavian artery is close to the orifice, and lesions (or potential ones) exist in the right carotid system.
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Affiliation(s)
- Ping Zhang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Daiqi Chen
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Daishi Tian
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Qiang Zhang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Minghuan Wang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Qian Li
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Xiang Luo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
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19
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Kang CH, Yang SB, Lee WH, Ahn JH, Goo DE, Han NJ, Ohm JY. Comparison of Open-Cell Stent and Closed-Cell Stent for Treatment of Central Vein Stenosis or Occlusion in Hemodialysis Patients. IRANIAN JOURNAL OF RADIOLOGY 2016; 13:e37994. [PMID: 27895880 PMCID: PMC5120236 DOI: 10.5812/iranjradiol.37994] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 08/02/2016] [Accepted: 08/16/2016] [Indexed: 11/25/2022]
Abstract
Background Central vein stenosis or occlusion is a common complication that can lead to significant morbidity and dysfunction of access in the hemodialysis patient. More lesions can develop over time, and preserving access becomes a challenge as life expectancy of the hemodialysis patient increases. Objectives The goal was to compare long-term results and determine the outcomes of open-cell stent versus closed-cell stent for central vein stenosis or occlusion in hemodialysis patients. Patients and Methods From 1997 to 2015, in 401 hemodialysis patients, stent placement for central vein stenosis or occlusion was performed if balloon angioplasty was unsatisfactory, due to elastic recoil or occurrence of restenosis within 3 months. When thrombus was present, primary stenting was performed. A total of 257 open-cell stents and 144 closed-cell stents were used. Angiographic findings including lesion site, central vein stenosis or occlusion, and presence of thrombosis and complication were evaluated. Primary patency rate and mean patency rate of the stent were compared between two stent groups by Kaplan-Meier survival analysis. Results For the open-cell stent group, 159 patients were diagnosed as central vein stenosis and 98 were occlusion. For the closed-cell stent group, 78 were stenosis and 66 were occlusion. There were two complications for central migration and two for procedure-related vein rupture. Open-cell stents and closed-cell stents had mean patency rates of 10.9 ± 0.80 months and 8.5 ± 10.87 months, respectively (P = 0.002). Conclusion The open-cell stent is effective and its performance is higher than that obtained with the closed-cell stent for treating central vein stenosis or occlusion in hemodialysis patients.
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Affiliation(s)
- Chae Hoon Kang
- Department of Radiology, Gangneung Asan Hospital, Gangneung, South Korea
| | - Seung Boo Yang
- Department of Radiology, Soonchunhyang University Hospital, Gumi, South Korea
- Corresponding author: Seung Boo Yang, Department of Radiology, Soonchunhyang University Hospital, Gumi, South Korea, E-mail:
| | - Woong Hee Lee
- Department of Radiology, Soonchunhyang University Hospital, Gumi, South Korea
| | - Jae Hong Ahn
- Department of Radiology, Gangneung Asan Hospital, Gangneung, South Korea
| | - Dong Erk Goo
- Department of Radiology, Soonchunhyang University Hospital, Gumi, South Korea
| | - Nae Jin Han
- Department of Radiology, Soonchunhyang University Hospital, Gumi, South Korea
| | - Joon Young Ohm
- Department of Radiology, Department of Radiology, Chungnam National University Hosiptal, Daejeon, South Korea
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20
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Kumar GP, Kabinejadian F, Liu J, Ho P, Leo HL, Cui F. Simulated Bench Testing to Evaluate the Mechanical Performance of New Carotid Stents. Artif Organs 2016; 41:267-272. [PMID: 27357068 DOI: 10.1111/aor.12745] [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] [Received: 10/12/2015] [Revised: 02/02/2016] [Accepted: 03/01/2016] [Indexed: 11/27/2022]
Abstract
Our group recently developed a novel covered carotid stent that can prevent emboli while preserving the external carotid artery (ECA) branch blood flow. However, our recent in vitro side-branch ECA flow preservation tests on the covered stents revealed the need for further stent frame design improvements, including the consideration to crimp the stent to a low profile for the delivery of the stent system and having bigger cells. Hence, the current work aims to design new bare metal stents with bigger cell size to improve the crimpability and to accommodate more slits so that the side-branch flow could be further increased. Three new stent designs were analyzed using finite element analysis and benchmarked against two commercially available carotid stents in terms of their mechanical performances such as crimpability, radial strength, and flexibility. Results indicated that the new bare metal stent designs matched well against the commercial stents. Hence our new generation covered stents based on these designs can be expected to perform better in side-branch flow preservation without compromising on their mechanical performances.
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Affiliation(s)
| | - Foad Kabinejadian
- Department of Bioengineering, National University of Singapore.,Department of Surgery, National University of Singapore
| | - Jianfei Liu
- Institute of High Performance Computing, A*STAR
| | - Pei Ho
- Department of Surgery, National University of Singapore.,Department of Cardiac, Thoracic & Vascular Surgery, National University Health System, Singapore
| | - Hwa Liang Leo
- Department of Bioengineering, National University of Singapore
| | - Fangsen Cui
- Institute of High Performance Computing, A*STAR
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21
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Stent linker effect in a porcine coronary restenosis model. J Mech Behav Biomed Mater 2016; 53:68-77. [DOI: 10.1016/j.jmbbm.2015.08.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/21/2015] [Accepted: 08/07/2015] [Indexed: 12/13/2022]
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22
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Galyfos G, Geropapas G, Sigala F, Aggeli K, Sianou A, Filis K. Meta-Analysis of Studies Evaluating the Effect of Cilostazol on Major Outcomes After Carotid Stenting. J Endovasc Ther 2015; 23:186-95. [PMID: 26620397 DOI: 10.1177/1526602815619409] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE To evaluate the effect of cilostazol on major outcomes after carotid artery stenting (CAS). METHODS A systematic literature review was conducted conforming to established criteria in order to identify articles published prior to May 2015 evaluating major post-CAS outcomes in patients treated with cilostazol vs patients not treated with cilostazol. Major outcomes included in-stent restenosis (ISR) within the observation period, the revascularization rate, major/minor bleeding, and the myocardial infarction/stroke/death rate (MI/stroke/death) at 30 days and within the observation period. Data were pooled for all studies containing adequate data for each outcome investigated; effect estimates are presented as the odds ratios (ORs) and 95 confidence intervals (CI). RESULTS Overall, 7 studies pertaining to 1297 patients were eligible. Heterogeneity was low among studies so a fixed-effect analysis was conducted. Six studies (n=1233) were compared for the ISR endpoint, showing a significantly lower ISR rate with cilostazol treatment after a mean follow-up of 20 months (OR 0.158, 95% CI 0.072 to 0.349, p<0.001). Five studies (n=649) were compared regarding 30-day MI/stroke/death (OR 0.724, 95% CI 0.293 to 1.789, p=0.484) and 3 studies (n=1076) were analyzed regarding MI/stroke/death within the entire follow-up period (OR 0.768, 95% CI 0.477 to 1.236, p=0.276); no significant difference was found between the groups. Data on bleeding rates and revascularization rates post ISR were inadequate to conduct further analysis. CONCLUSION Cilostazol seems to decrease total ISR rates in patients undergoing CAS without affecting MI/stroke/death events, both in the early and late settings.
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Affiliation(s)
- George Galyfos
- First Department of Propaedeutic Surgery, University of Athens Medical School, Hippocration Hospital, Athens, Greece Department of Vascular Surgery, KAT General Hospital, Athens, Greece
| | | | - Fragiska Sigala
- First Department of Propaedeutic Surgery, University of Athens Medical School, Hippocration Hospital, Athens, Greece
| | - Konstantina Aggeli
- First Department of Cardiology, University of Athens Medical School, Hippocration Hospital, Athens, Greece
| | - Argiri Sianou
- Department of Microbiology, University of Athens Medical School, Areteion Hospital, Athens, Greece
| | - Konstantinos Filis
- First Department of Propaedeutic Surgery, University of Athens Medical School, Hippocration Hospital, Athens, Greece
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Alparslan B, Nas OF, Eritmen UT, Duran S, Ozkaya G, Hakyemez B. The Effect of Stent Cell Geometry on Carotid Stenting Outcomes. Cardiovasc Intervent Radiol 2015; 39:507-13. [PMID: 26493821 DOI: 10.1007/s00270-015-1211-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 08/29/2015] [Indexed: 11/30/2022]
Abstract
PURPOSE The aim of this study was to investigate the effect of stent cell geometry on midterm results of carotid artery stenting (CAS). MATERIALS AND METHOD One hundred fifty-five patients underwent CAS between February 2010 and December 2012. Ninety-one open- and 84 closed-cell stents were used in this non-randomized, retrospective study. Periprocedural complications were defined as the ones happened during the procedure or within 30 days afterwards. Starting from the 6th month after the procedure, in-stent restenosis was detected with multidetector computed tomography angiography and classified into four groups from focal restenosis to occlusion. RESULTS Eleven complications were encountered in the periprocedural period (four on the open- and seven on the closed-cell group). Total complication rate was 6.3% (11/175). No significant difference was detected in terms of periprocedural complications between two groups (p = 0.643). There was statistically significant difference between stent design groups in regard to radiological findings (p = 0.002). Sixteen of open-cell stents and three of closed-cell stents had focal restenosis. One closed-cell stent had diffuse proliferative restenosis and one open-cell stent had total occlusion. CONCLUSION In-stent restenosis was more common in open-cell stent group, which have larger free cell area than closed-cell stents. Although our radiologic findings promote us to use closed-cell design if 'possible', no difference was detected in terms of clinical outcomes.
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Affiliation(s)
| | - Omer Fatih Nas
- Department of Radiology, Uludag University Faculty of Medicine, Bursa, Turkey.
| | | | - Selcen Duran
- Neurology Clinic, Yerkoy State Hospital, Yozgat, Turkey.
| | - Guven Ozkaya
- Department of Biostatistics, Uludag University Faculty of Medicine, Bursa, Turkey.
| | - Bahattin Hakyemez
- Department of Radiology, Uludag University Faculty of Medicine, Bursa, Turkey.
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Verma H, Meda N, Vora S, George RK, Tripathi RK. Contemporary management of symptomatic primary aortic mural thrombus. J Vasc Surg 2014; 60:1524-34. [DOI: 10.1016/j.jvs.2014.08.057] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 08/04/2014] [Indexed: 10/24/2022]
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25
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Morr S, Lin N, Siddiqui AH. Carotid artery stenting: current and emerging options. MEDICAL DEVICES-EVIDENCE AND RESEARCH 2014; 7:343-55. [PMID: 25349483 PMCID: PMC4208632 DOI: 10.2147/mder.s46044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Carotid artery stenting technologies are rapidly evolving. Options for endovascular surgeons and interventionists who treat occlusive carotid disease continue to expand. We here present an update and overview of carotid stenting devices. Evidence supporting carotid stenting includes randomized controlled trials that compare endovascular stenting to open surgical endarterectomy. Carotid technologies addressed include the carotid stents themselves as well as adjunct neuroprotective devices. Aspects of stent technology include bare-metal versus covered stents, stent tapering, and free-cell area. Drug-eluting and cutting balloon indications are described. Embolization protection options and new direct carotid access strategies are reviewed. Adjunct technologies, such as intravascular ultrasound imaging and risk stratification algorithms, are discussed. Bare-metal and covered stents provide unique advantages and disadvantages. Stent tapering may allow for a more fitted contour to the caliber decrement between the common carotid and internal carotid arteries but also introduces new technical challenges. Studies regarding free-cell area are conflicting with respect to benefits and associated risk; clinical relevance of associated adverse effects associated with either type is unclear. Embolization protection strategies include distal filter protection and flow reversal. Though flow reversal was initially met with some skepticism, it has gained wider acceptance and may provide the advantage of not crossing the carotid lesion before protection is established. New direct carotid access techniques address difficult anatomy and incorporate sophisticated flow-reversal embolization protection techniques. Carotid stenting is a new and exciting field with rapidly advancing technologies. Embolization protection, low-risk deployment, and lesion assessment and stratification are active areas of research. Ample room remains for further innovations and developments.
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Affiliation(s)
- Simon Morr
- Department of Neurosurgery, School of Medicine and Biomedical Sciences, Buffalo, NY, USA ; Department of Neurosurgery, Gates Vascular Institute, Kaleida Health, Buffalo, NY, USA
| | - Ning Lin
- Department of Neurosurgery, School of Medicine and Biomedical Sciences, Buffalo, NY, USA ; Department of Neurosurgery, Gates Vascular Institute, Kaleida Health, Buffalo, NY, USA
| | - Adnan H Siddiqui
- Department of Neurosurgery, School of Medicine and Biomedical Sciences, Buffalo, NY, USA ; Department of Radiology, School of Medicine and Biomedical Sciences, Buffalo, NY, USA ; Toshiba Stroke and Vascular Research Center, University at Buffalo, State University of New York, Buffalo, NY, USA ; Department of Neurosurgery, Gates Vascular Institute, Kaleida Health, Buffalo, NY, USA ; Jacobs Institute, Buffalo, NY, USA
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26
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Schönholz C, Yamada R, Montgomery W, Brothers T, Guimaraes M. First-in-Man Implantation of a New Hybrid Carotid Stent to Prevent Periprocedural Neurological Events During Carotid Artery Stenting. J Endovasc Ther 2014; 21:601-4. [DOI: 10.1583/14-4735r.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Uemiya N, Lee CJ, Ishihara S, Yamane F, Zhang Y, Qian Y. Analysis of restenosis after carotid artery stenting: preliminary results using computational fluid dynamics based on three-dimensional angiography. J Clin Neurosci 2013; 20:1582-7. [PMID: 24035423 DOI: 10.1016/j.jocn.2013.03.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 03/30/2013] [Indexed: 10/26/2022]
Abstract
Currently carotid artery stenting (CAS) is a widely used technique for the treatment of carotid artery stenosis. However, some patients with restenosis following CAS have been reported, resulting in potential clinical problems. The purpose of this study was to investigate the hemodynamic changes before and after CAS to find the factors that may influence restenosis. Five patients (two with restenosis, three without restenosis) were included in this study. The geometry and rheological conditions of the carotid arteries were obtained from three-dimensional digital subtraction angiography and ultrasound measurements. Computational fluid dynamics (CFD) modelling was performed to calculate wall shear stress (WSS), wall shear stress gradient (WSSG) and internal carotid artery (ICA) flow ratio. In addition, morphologic analysis was carried out. CFD results indicated that the WSSG of the restenosis group was significantly larger than that of the no-restenosis group. In the restenosis group, the WSS distribution after CAS showed a significant variation at the ICA. The average ICA flow ratio of the restenosis group was 43.5%, while in the no-restenosis group it was 68.6%. Furthermore, there were similar significant differences between the two groups during morphology analysis. CFD technology is useful for physicians in estimating haemodynamic changes during ICA stenosis treatment. These parameters, including ICA flow ratio and WSS distribution, may help to predict carotid restenosis. In future, CFD combined with other medical techniques such as digital subtraction angiography, MRI and pathology technologies will be available for the clinical estimation of ICA restenosis.
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Affiliation(s)
- Nahoko Uemiya
- Australian School of Advanced Medicine, Macquarie University, 2 Technology Place, Macquarie Park, Sydney, NSW 2109, Australia; Department of Endovascular Neurosurgery, Saitama Medical University International Medical Center, Saitama, Japan
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28
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Park KY, Kim DI, Kim BM, Nam HS, Kim YD, Heo JH, Kim DJ. Incidence of embolism associated with carotid artery stenting: open-cell versus closed-cell stents. J Neurosurg 2013; 119:642-7. [PMID: 23790113 DOI: 10.3171/2013.5.jns1331] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
Carotid artery stenting (CAS) can be an alternative option for carotid endarterectomy in the prevention of ischemic stroke caused by carotid artery stenosis. The purpose of this study was to evaluate the influence of stent design on the incidence of procedural and postprocedural embolism associated with CAS treatment.
Methods
Ninety-six symptomatic and asymptomatic patients, consisting of 79 males and 17 females, with moderate to severe carotid artery stenosis and a mean age of 69.0 years were treated with CAS. The stent type (48 closed-cell and 48 open-cell stents) was randomly allocated before the procedure. Imaging, procedural, and clinical outcomes were assessed and compared. The symptomatic subgroup (76 patients) was also analyzed to determine the influence of stent design on outcome.
Results
New lesions on postprocedural diffusion-weighted imaging (DWI) were significantly more frequent in the open-cell than in the closed-cell stent group (24 vs 12, respectively; p = 0.020). The 30-day clinical outcome was not different between the 2 stent groups. In the symptomatic patient group, stent design (p = 0.017, OR 4.173) and recent smoking history (p = 0.036, OR 4.755) were strong risk factors for new lesions on postprocedural DWI.
Conclusions
Stent design may have an influence on the risk of new embolism, and selecting the appropriate stent may improve outcome.
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Affiliation(s)
- Keun Young Park
- 1Departments of Radiology and
- 3Department of Neurosurgery, National Health Insurance Corporation Ilsan Hospital, Goyang-si, Gyeonggi-do, Republic of Korea
| | | | | | - Hyo Suk Nam
- 2Neurology, Yonsei University College of Medicine, Seoul; and
| | - Young Dae Kim
- 2Neurology, Yonsei University College of Medicine, Seoul; and
| | - Ji Hoe Heo
- 2Neurology, Yonsei University College of Medicine, Seoul; and
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29
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Interprocedural Comparison of Changes in Natural Flow Velocity Patterns in the Internal Carotid Artery Following CAS or CEA. Eur J Vasc Endovasc Surg 2013; 45:554-61. [DOI: 10.1016/j.ejvs.2013.02.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 02/18/2013] [Indexed: 11/22/2022]
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30
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Tadros RO, Malik RK, Vouyouka AG, Ellozy SH, Marin ML, Faries PL. A systematic review of carotid stent design and selection: strategies to optimize procedural outcomes. Interv Cardiol 2013. [DOI: 10.2217/ica.13.8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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31
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Szczerbo-Trojanowska M, Jargiełło T, Drelich-Zbroja A. Management of carotid stenosis. History and today. J Ultrason 2013; 13:6-20. [PMID: 26675711 PMCID: PMC4613569 DOI: 10.15557/jou.2013.0001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 02/15/2013] [Accepted: 03/22/2013] [Indexed: 11/22/2022] Open
Abstract
Internal carotid stenosis constitutes a significant clinical challenge, since it is the cause of 20–25% of ischemic brain strokes. The management of the internal carotid stenosis for many years has been raising controversies amongst neurologists, vascular surgeons and interventional radiologists mainly due to the introduction of endovascular stenting as an alternative to surgical treatment. Its application, however, requires knowledge of specific selection criteria for this kind of treatment as well as of the methods of monitoring patients after stent implantation into the internal carotid artery. Duplex Doppler ultrasound examination is currently a basis for the diagnosis of the arterial stenosis of precranial segments of the carotid arteries. It allows a reliable assessment of not only the course and morphology of the walls, but also of the hemodynamics of blood flow. Interventional treatment is applicable in patients with internal carotid stenosis of ≥70%, which is accompanied by an increase of the systolic flow velocity above 200 cm/s and the end-diastolic velocity above 50–60 cm/s in the stenotic lumen. In most cases, such a diagnosis in duplex Doppler ultrasound examination does not require any confirmation by additional diagnostic methods and if neurological symptoms are also present, it constitutes a single indication for interventional treatment. When deciding about choice of surgical or endovascular method of treatment, the following factors are of crucial importance: morphology of atherosclerotic plaque, its size, echogenicity, homogeneity of its structure, its surface and outlines. By means of ultrasound examinations, patients can be monitored after endovascular stent implantation. They enable evaluation of the degree of stent patency and allow for an early detection of symptoms indicating stenosis recurrence or presence of in-stent thrombosis. When interpreting the findings of the US checkup, it is essential to refer to the initial examination performed in the first days after the procedure and the next ones conducted during the monitoring period.
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Affiliation(s)
| | - Tomasz Jargiełło
- Katedra Radiologii, Zakład Radiologii Zabiegowej i Neuroradiologii, Uniwersytet Medyczny w Lublinie, Lublin, Polska
| | - Anna Drelich-Zbroja
- Katedra Radiologii, Zakład Radiologii Zabiegowej i Neuroradiologii, Uniwersytet Medyczny w Lublinie, Lublin, Polska
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Pizzolato R, Hirsch JA, Romero JM. Imaging challenges of carotid artery in-stent restenosis. J Neurointerv Surg 2013; 6:32-41. [DOI: 10.1136/neurintsurg-2012-010618] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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33
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Hakimi M, Knez P, Lippert M, Attigah N, Nelson K, Laub T, Böckler D, Schmitz-Rixen T, Schmandra T. Altered in-stent hemodynamics may cause erroneous upgrading of moderate carotid artery restenosis when evaluated by duplex ultrasound. J Vasc Surg 2012; 56:1403-8. [PMID: 22608183 DOI: 10.1016/j.jvs.2012.03.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 03/06/2012] [Accepted: 03/10/2012] [Indexed: 10/28/2022]
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Ahn SJ, Bae JI, Han TS, Won JH, Kim JD, Kwack KS, Lee JH, Kim YC. Percutaneous biliary drainage using open cell stents for malignant biliary hilar obstruction. Korean J Radiol 2012; 13:795-802. [PMID: 23118579 PMCID: PMC3484301 DOI: 10.3348/kjr.2012.13.6.795] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 05/14/2012] [Indexed: 12/17/2022] Open
Abstract
Objective To evaluate the feasibility, safety and the effectiveness of the complex assembly of open cell nitinol stents for biliary hilar malignancy. Materials and Methods During the 10 month period between January and October 2007, 26 consecutive patients with malignant biliary hilar obstruction underwent percutaneous insertion of open cell design nitinol stents. Four types of stent placement methods were used according to the patients' ductal anatomy of the hilum. We evaluated the technical feasibility of stent placement, complications, patient survival, and the duration of stent patency. Results Bilobar biliary stent placement was conducted in 26 patients with malignant biliary obstruction-T (n = 9), Y (n = 7), crisscross (n = 6) and multiple intersecting types (n = 4). Primary technical success was obtained in 24 of 26 (93%) patients. The crushing of the 1st stent during insertion of the 2nd stent occurred in two cases. Major complications occurred in 2 of 26 patients (7.7%). One case of active bleeding from hepatic segmental artery and one case of sepsis after procedure occurred. Clinical success was achieved in 21 of 24 (87.5%) patients, who were followed for a mean of 141.5 days (range 25-354 days). The mean primary stent patency period was 191.8 days and the mean patient survival period was 299 days. Conclusion Applying an open cell stent in the biliary system is feasible, and can be effective, especially in multiple intersecting stent insertions in the hepatic hilum.
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Affiliation(s)
- Sun Jun Ahn
- Department of Radiology, Ajou University School of Medicine, Suwon 443-380, Korea
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35
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Kim ESH, Sun Z, Kapadia S, Bajzer C, Arrigain S, Gornik HL. Characteristics of duplex sonographic parameters over time after successful carotid artery stenting. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2012; 31:1169-1174. [PMID: 22837280 DOI: 10.7863/jum.2012.31.8.1169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
OBJECTIVES Carotid duplex sonography is the primary tool for surveillance after carotid artery stenting, but the course of sonographic velocities over time after successful stenting is unclear. The purpose of this study was to describe carotid duplex sonographic velocity parameters after successful carotid artery stenting and to determine the predictors of poststent sonographic velocities. METHODS We queried institutional carotid stent and noninvasive vascular laboratory databases for internal carotid artery stents placed between January 2004 and June 2007. We included patients with stenosis of 20% or less on completion angiograms who had carotid duplex sonography within 30 days before and 7 days after stenting. The prestent peak systolic velocity (PSV), end-diastolic velocity (EDV), internal-to-common carotid artery PSV ratio, contralateral internal carotid artery velocities, stent type, open- versus closed-cell stent design, and days of follow-up were tested as potential predictors of poststent velocities. RESULTS Eighty-two of 498 patients met inclusion criteria. The mean PSV and PSV ratio decreased from 423.6 cm/s and 7.1 before stenting to 98.5 cm/s and 1.3 after stenting (both P < .001). During a median follow-up of 370 days, poststent velocities remained stable. All poststent velocities (PSV, EDV, and PSV ratio) were dependent on prestent ipsilateral and contralateral velocities. The poststent EDV was dependent on the type of stent. The upper range for 0% to 20% stenosis in the stented internal carotid artery was a PSV of 141 cm/s, an EDV of 42 cm/s, and a PSV ratio of 2.1 or lower. CONCLUSIONS With a median follow-up of 1 year, the PSV and PSV ratio remained stable over time in successfully stented carotid arteries. Deviations in sonographic parameters after initial poststent carotid duplex sonography should prompt an investigation for possible in-stent restenosis.
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Affiliation(s)
- Esther S H Kim
- Section of Vascular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA.
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Park HR, Yoon SM, Shim JJ, Kim SH. Waffle-Cone Technique Using Solitaire AB Stent. J Korean Neurosurg Soc 2012; 51:222-6. [PMID: 22737303 PMCID: PMC3377880 DOI: 10.3340/jkns.2012.51.4.222] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Revised: 11/28/2011] [Accepted: 04/15/2012] [Indexed: 11/27/2022] Open
Abstract
The waffle-cone technique is a modified stent application technique, which involves protrusion of the distal portion of a stent into an aneurysm fundus to provide neck support for subsequent coiling. The authors report two cases of wide necked basilar bifurcation aneurysms, which were not amenable to stent assisted coiling, that were treated using the waffle-cone technique with a Solitaire AB stent. A 58-year-old woman presented with severe headache. Brain CT showed subarachnoid hemorrhage and angiography demonstrated a ruptured giant basilar bifurcation aneurysm with broad neck, which was treated with a Solitaire AB stent and coils using the waffle-cone technique. The second case involved an 81-year-old man, who presented with dizziness caused by brain stem infarction. Angiography also demonstrated a large basilar bifurcation unruptured aneurysm with broad neck. Solitaire AB stent deployment using the waffle-cone technique, followed by coiling resulted in near complete obliteration of aneurysm. The waffle-cone technique with a Solitaire AB stent can be a useful alternative to conventional stent application when it is difficult to catheterize bilateral posterior cerebral arteries in patients with a wide-necked basilar bifurcation aneurysm.
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Affiliation(s)
- Hye-Ran Park
- Department of Neurosurgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea
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37
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Shankar JJS, Zhang J, dos Santos M, Lesiuk H, Mohan R, Lum C. Factors affecting long-term restenosis after carotid stenting for carotid atherosclerotic disease. Neuroradiology 2012; 54:1347-53. [DOI: 10.1007/s00234-012-1031-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 03/14/2012] [Indexed: 10/28/2022]
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Hussain HG, Aparajita R, Khan SZ, Rezayat C, McKinsey JF, Dayal R. Closed-Cell Stents Present With Higher Velocities on Duplex Ultrasound Compared With Open-Cell Stents After Carotid Intervention: Short- and Mid-Term Results. Ann Vasc Surg 2011; 25:55-63. [DOI: 10.1016/j.avsg.2010.07.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 07/12/2010] [Accepted: 07/17/2010] [Indexed: 10/19/2022]
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Fleming SH, Davis RP, Craven TE, Deonanan JK, Godshall CJ, Hansen KJ. Accuracy of duplex sonography scans after renal artery stenting. J Vasc Surg 2010; 52:953-7; discussion 958. [DOI: 10.1016/j.jvs.2010.04.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 04/20/2010] [Accepted: 04/20/2010] [Indexed: 10/19/2022]
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Moulakakis KG, Mylonas S, Avgerinos E, Kotsis T, Liapis CD. An update of the role of endovascular repair in blunt carotid artery trauma. Eur J Vasc Endovasc Surg 2010; 40:312-9. [PMID: 20573526 DOI: 10.1016/j.ejvs.2010.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Accepted: 05/11/2010] [Indexed: 12/26/2022]
Abstract
Blunt carotid injury (BCAI) is an increasingly recognised entity in trauma patients. Without a prompt diagnosis and a proper treatment, they can result in devastating consequences with cerebral ischaemia rate of 40-80% and mortality rate of 25-60%. Several applied screening protocols and continuously improving diagnostic modalities have been developed to identify patients with BCAI. The appropriate treatment of BCAI still remains controversial and strictly individualised. Besides anti-thrombotic/anticoagulation therapy and surgical intervention, continuously evolving endovascular techniques emerge as an additional treatment option for patients with BCAI. We provide an update on blunt carotid trauma, emphasising the role of endovascular approaches.
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Affiliation(s)
- K G Moulakakis
- Department of Vascular Surgery, Athens University Medical School, Attikon University Hospital, Athens, Greece.
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41
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Impact of Stent Design on In-Stent Stenosis in a Rabbit Iliac Artery Model. Cardiovasc Intervent Radiol 2009; 33:565-75. [DOI: 10.1007/s00270-009-9757-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Accepted: 11/02/2009] [Indexed: 10/20/2022]
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de Borst GJ, Moll FL, Vos JA. Regarding “Open-cell versus closed-cell stent design differences in blood flow velocities after carotid stenting”. J Vasc Surg 2009; 50:476-7; author reply 477. [DOI: 10.1016/j.jvs.2009.04.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Revised: 04/03/2009] [Accepted: 04/06/2009] [Indexed: 11/16/2022]
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