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Zhang X, Fan Z, Zhao P, Ye X, Deng X, Guidoin R, Liu M. Elucidating the hemodynamic impact of residual stenosis post-carotid artery stenting: A numerical study. Med Phys 2024. [PMID: 39255333 DOI: 10.1002/mp.17386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 07/24/2024] [Accepted: 08/23/2024] [Indexed: 09/12/2024] Open
Abstract
BACKGROUND Residual stenosis (RS) and hemodynamics demonstrate a significant correlation with postoperative in-stent restenosis/thrombosis following carotid artery stenting (CAS). PURPOSE This study endeavors to elucidate the potential associations between RS and adverse postoperative hemodynamic factors. METHODS This study utilized 46 patient-specific carotid artery models post-stenting, which were categorized into two groups based on the presence of RS: the normal group (N, n = 23) and the RS group (RS, n = 23). A comparative analysis was conducted to evaluate the discrepancies in geometry and adverse hemodynamic parameters, alongside investigating the potential correlation between hemodynamic and geometric parameters. RESULTS The results reveal that a higher reflux flow volume is discernible in the RS group during low-velocity phases of the cardiac cycle, concomitant with an augmented extent of areas exposed to oscillatory shear stress and extended particle residence time. Moreover, the adverse hemodynamic parameters exhibit a positive correlation with the degree of stent expansion, stent length in the common carotid artery (CCA), and the distal slope of the RS. CONCLUSION The distal slope and tortuosity of RS significantly influence the development of adverse hemodynamic conditions post-stenting, exacerbating the hemodynamic environment near the stenosis. Interestingly, while an extended stent length in the internal carotid artery (ICA) region improves hemodynamics by reducing flow disturbance, a longer stent in the CCA significantly worsens these conditions. Hence, it is prudent to analyze the characteristics of the local lesion regions to optimize the strategy for stent implantation.
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Affiliation(s)
- Xianghao Zhang
- School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, China
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Zhenmin Fan
- School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, China
| | - Pengfei Zhao
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xia Ye
- School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, China
| | - Xiaoyan Deng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Robert Guidoin
- Department of Surgery, Universit´e Laval and Division of Regenerative Medicine, CHU de Qu´ebec Research Centre, Québec City, Quebec, Canada
| | - Mingyuan Liu
- Department of Vascular Surgery, Beijing Friendship Hospital, Beijing Center for Vascular Surgery, Capital Medical University, Beijing, China
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Li S, Zhao W, Jian T, Xu F, Li Z, Yang X, Wang S, Wu W, Wang J, Lou J, Li J. Quantitative assessment of retinochoroidal microvasculature in patients with carotid artery stenosis using OCT angiography. Photodiagnosis Photodyn Ther 2024; 46:104082. [PMID: 38588872 DOI: 10.1016/j.pdpdt.2024.104082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/27/2024] [Accepted: 04/05/2024] [Indexed: 04/10/2024]
Abstract
PURPOSE To investigate the alterations in retinochoroidal parameters measured by optical coherence tomography (OCT) and OCT angiography (OCTA) in patients with carotid artery stenosis (CAS) and assess their associations with digital subtraction angiography (DSA) data. METHOD This study enrolled patients diagnosed with CAS and age-matched healthy controls. Both groups underwent OCT and OCTA examinations. DSA and assessment of carotid artery stenosis were performed only in the CAS group. The study evaluated various retinochoroidal parameters from OCT and OCTA, including linear vessel density (LVD), foveal avascular zone (FAZ), choroidal thickness (ChT), and retinal nerve fiber layer (RNFL) thickness. DSA-derived measures included cervical segment (C1) diameter, cavernous segment (C4) diameter, stenosis percentage, ophthalmic artery (OA) filling time, C1-OA filling time, and residual stenosis. RESULTS A total of 42 eyes from 30 CAS patients and 60 eyes from 30 healthy controls were included. Patients with CAS displayed significantly decreased LVD compared to controls (p < 0.001). Additionally, the CAS group had thinner choroid and RNFL (p = 0.047 and p < 0.001, respectively). Macular LVD negatively correlated with both stenosis percentage and C1-OA filling time (p = 0.010 and p = 0.014, respectively). In patients who underwent carotid artery stenting, preoperative ChT significantly correlated with residual stenosis (Pearson r = -0.480, p = 0.020). CONCLUSION OCT and OCTA provide a quantitative assessment of retinochoroidal microstructural changes associated with CAS, suggesting potential for noninvasive evaluation of the disease. This might contribute to the prevention of irreversible ocular complications and early detection of CAS. Furthermore, ChT may not only aid in diagnosing CAS more reliably but also offer prognostic information.
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Affiliation(s)
- Shiqiang Li
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Wenjuan Zhao
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Tianzi Jian
- Department of Hematology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Fabao Xu
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Zhiwen Li
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Xueying Yang
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Shaopeng Wang
- Zibo Central Hospital, Binzhou Medical University, Zibo, Shandong province, China
| | - Wei Wu
- Department of Neurology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.
| | - Jiawei Wang
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.
| | - Jianwei Lou
- Department of Neurology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.
| | - Jianqiao Li
- Department of Ophthalmology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.
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Nunna RS, Ma X, Genovese S, Lodhi A, Bains NK, Cohen D, Smith C, Ortiz MJ, Siddiq F, Gomez CR, Qureshi AI. Impact of post-procedure stenosis on outcomes of patients with severe intracranial stenosis treated with intracranial stent placement. J Neurointerv Surg 2024:jnis-2023-021223. [PMID: 38471761 DOI: 10.1136/jnis-2023-021223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 02/12/2024] [Indexed: 03/14/2024]
Abstract
BACKGROUND The optimal target post-procedure stenosis after percutaneous angioplasty and stent placement (PTAS) for intracranial stenosis is unknown. We determined the effect of post-procedure stenosis after intracranial PTAS on subsequent clinical events in patients with severe symptomatic intracranial stenosis. METHODS We categorized the severity of post-procedure stenosis as '<30%', '30-49%', and '≥50%' among 207 patients who underwent PTAS in a multicenter randomized clinical trial. Outcomes included stroke or death within 72 hours and within 30 days, ipsilateral stroke beyond 30 days of treatment, and stroke or death within 30 days or stroke in the qualifying artery beyond 30 days (primary endpoint of the trial). Cox proportional hazards analysis was performed with adjustments for age, initial severity of stenosis, location of stenosis, and qualifying event. Kaplan-Meier curves were generated for the primary endpoint stratified by post-procedure stenosis with log-rank analysis. RESULTS The severity of post-procedure stenosis was categorized as <30%, 30-49%, and ≥50% in 112, 73, and 22 patients, respectively. Compared with patients with post-procedure stenosis <30%, there was no difference in the risk of primary endpoint among patients with post-procedure stenoses of 30-49% (hazards ratio (HR) 0.85, 95% confidence interval (95% CI) 0.64 to 1.15) or those with ≥50% (HR 0.91, 95% CI 0.57 to 1.43). Log-rank analysis did not demonstrate a difference in rates of primary endpoint between groups stratified by post-procedure stenosis (P=0.70). CONCLUSION In the absence of any benefit on short- and long-term outcomes, strategies to achieve a low severity of post-procedure stenosis among patients with severe intracranial stenosis may not be warranted.
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Affiliation(s)
- Ravi S Nunna
- Department of Neurosurgery, University of Missouri, Columbia, Missouri, USA
| | - Xiaoyu Ma
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Sabrina Genovese
- University of Missouri School of Medicine, Columbia, Missouri, USA
| | - Abdullah Lodhi
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Navpreet K Bains
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - David Cohen
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Caitlyn Smith
- University of Missouri School of Medicine, Columbia, Missouri, USA
| | - Michael J Ortiz
- Department of Neurosurgery, University of Missouri, Columbia, Missouri, USA
| | - Farhan Siddiq
- Department of Neurosurgery, University of Missouri, Columbia, Missouri, USA
| | - Camilo R Gomez
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Adnan I Qureshi
- Zeenat Qureshi Stroke Institute and Department of Neurology, University of Missouri, Columbia, Missouri, USA
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Ginanni Corradini L, Maresca L, Lucatelli P, Balocco S, D'Onofrio A, Stefanini M. The role of post-dilatation in carotid MicroNet-covered stent implantation, evaluated using 3D cone-beam CT angiography. THE JOURNAL OF CARDIOVASCULAR SURGERY 2023; 64:608-614. [PMID: 38015552 DOI: 10.23736/s0021-9509.23.12756-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
BACKGROUND This study aims to assess the role and safety of post-dilatation in protected carotid artery stenting (PCAS) using the new MicroNet-covered 2nd-generation stent assessed by cone beam CT scans. METHODS From March 2020 to March 2022, patients were enrolled in the study according to CT angiography results based on the following criteria: Evidence of 70% to 99% carotid stenosis in asymptomatic patients and 50% to 99% in symptomatic patients, per the NASCET index. Using a FilterWire EZ™ (Boston Scientific, Natick, MA, USA) embolic protection system (EPS), MicroNet-covered stent PCAS was performed by two interventional radiologists with at least 8 years of experience in endovascular intervention. Each patient underwent post-dilatation following stent placement. Finally, a third radiologist (not participating in the interventional procedures) evaluated the cone beam CT scans and calculated residual stenosis. Major and minor complications were recorded in the 30 days following the procedure. RESULTS A total of 192 patients (121 male, mean age 73±10 years) were included in the study, and all patients received post-dilatation following stent implantation. Technical successes were achieved in all procedures. Adverse events noted in this study were limited to periprocedural transient ischemic attacks that occurred in three out of 192 patients (1.6%) and showed a swift complete recovery. The post-dilatation balloon diameters used in the study were: 5.0 mm (30.3%), 5.5 mm (39.3%) and 6 mm (30.3%). Optimized postdilatation resulted in a significant increase in the final luminal area. Similar improvements were observed in all subtypes of plaque. CONCLUSIONS Post-dilatation in protected CAS is safe and induces a significant improvement in the cross-sectional area regardless of the stenotic plaque.
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Affiliation(s)
| | - Luciano Maresca
- Department of Radiology and Interventional Radiology, Casilino Hospital, Rome, Italy
| | | | - Simone Balocco
- Department of Mathematics and Informatics, University of Barcelona, Barcelona, Spain
- Computer Vision Center, Bellaterra, Spain
| | - Adolfo D'Onofrio
- Department of Radiology and Interventional Radiology, Casilino Hospital, Rome, Italy
| | - Matteo Stefanini
- Department of Radiology and Interventional Radiology, Casilino Hospital, Rome, Italy
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Roh J, Baik SK, Yeom JA, Park KP, Ahn SH, Park MG. Usefulness of cone-beam computed tomography to predict residual stenosis after carotid artery stenting. Interv Neuroradiol 2022:15910199221143259. [PMID: 36523192 DOI: 10.1177/15910199221143259] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024] Open
Abstract
OBJECTIVES The long-term durability of carotid artery stenting (CAS) may be determined by various factors; however, residual stenosis is a known risk factor for in-stent restenosis. The authors of this article utilized cone-beam computed tomography (CBCT) in angiosuite to investigate plaque features affecting the character and quality of stent expansion after CAS. METHODS Forty-two CAS cases with both pre- and post-CAS CBCT evaluations were included in this retrospective analysis. Five features derived from pre-CAS images were tested: (1) eccentricity, (2) overballoon, (3) maximum plaque thickness, (4) calcification barrier, and (5) stenotic degree. For post-CAS CBCT, stent configuration was assessed if the stent was expanded and oval or round in shape as well as outward or inward in orientation. Variables were tested if they were associated with oval expansion, outward expansion, and 20% residual stenosis after CAS. RESULTS Oval or outward expansion is directly related to residual stenosis. The oval expansion was associated with maximum plaque thickness, and outward expansion was associated with the presence of a calcification barrier. Variables related to > 20% residual stenosis were the maximum plaque thickness, calcification barrier, and pre-CAS stenotic degree. CONCLUSIONS CBCT for carotid stenosis may provide valuable information about plaque features, especially calcification features that may interfere with the angioplasty effect, as well as the characteristics and quality of stent expansion. Residual stenosis > 20% was associated with calcification barrier, maximum plaque thickness, and pre-CAS stenotic degree.
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Affiliation(s)
- Jieun Roh
- Department of Radiology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
| | - Seung Kug Baik
- Department of Radiology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
| | - Jeong A Yeom
- Department of Radiology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
| | - Kyung-Pil Park
- Department of Neurology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
| | - Sung-Ho Ahn
- Department of Neurology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
| | - Min-Gyu Park
- Department of Neurology, 194197Pusan National University Yangsan Hospital, Yangsan-si, South Korea
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Factors contributing to restenosis after carotid artery stenting and the usefulness of magnetic resonance plaque imaging: A study of 308 consecutive patients. Eur J Radiol 2022; 154:110398. [DOI: 10.1016/j.ejrad.2022.110398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/29/2022] [Accepted: 06/03/2022] [Indexed: 11/20/2022]
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Balloon Dilation Strategy Does Not Affect Outcomes for Transcarotid Artery Revascularization (TCAR) in Prospective Trials. J Vasc Surg 2022; 76:202-208. [PMID: 35149162 DOI: 10.1016/j.jvs.2022.01.124] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 01/21/2022] [Indexed: 11/21/2022]
Abstract
OBJECTIVES Strategies of balloon dilation during trans-femoral carotid artery stenting (TFCAS) include pre-stent dilation only (PRE), post-stent dilation only (POST), or both pre- and post- dilation (PRE+POST). Concerns over higher neurological risk have been raised with POST and PRE+POST during TFCAS. Whether these concerns are applicable to Transcarotid Artery Revascularization (TCAR) which utilizes proximal clamping and cerebral blood flow reversal during stent deployment and balloon angioplasty remains unknown. Our aim is to analyze outcomes of PRE, POST or PRE+POST balloon dilation strategies during TCAR. METHODS We analyzed the prospectively collected data from the ROADSTER1 (pivotal), ROADSTER2 (FDA indicated post-market), and Roadster Extended Access TCAR trials. All trial patients had high risk anatomic or clinical factors for carotid endarterectomy and were included unless they did not undergo stent deployment nor balloon dilation. For trial inclusion, asymptomatic patients had >80% carotid stenosis, and symptomatic patients had >50% stenosis. Primary outcome measures were stroke, death, and myocardial infarction (MI) at 30 days. Data were statistically analyzed with chi-square, ANOVA, and multivariable analysis as appropriate. RESULTS There were 851 patients (566 male) who underwent dilation by PRE (N=216), POST (N=249), or PRE+POST (N=386). Patients had carotid stenosis >70% (N=828, 97%), and 207 (24%) were symptomatic. Flow reversal times were longer in the PRE+POST group (PRE 10.2mins, POST 9.8mins, PRE+ POST 13.3mins, P<.001). The 30-day stroke rate for the whole cohort was 1.9%, mortality was 0.5%, and MI rate was 0.94%. Stroke rates for the PRE cohort (1.9%), POST cohort (2.0%), and PRE+POST cohort (1.8%, P=.98) were similar. Also, death rates at 30 days, and composite stroke/death/myocardial infarction rates were similar in the three cohorts. No significant differences in adverse outcomes were noted among the various dilation strategies for both symptomatic and asymptomatic patients. CONCLUSION Based on these prospective trial data, there is no difference in neurological complications due to balloon dilation strategy during TCAR. Balloon dilation technique best suited to the patient's specific lesion morphology should be utilized. Further studies are needed to evaluate the relationship of these dilation strategies to long term outcomes including stent patency, restenosis and reintervention.
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Dakour-Aridi H, Cui CL, Barleben A, Schermerhorn ML, Eldrup-Jorgensen J, Malas MB. Poststent ballooning during transcarotid artery revascularization. J Vasc Surg 2020; 73:2041-2049.e1. [PMID: 33253868 DOI: 10.1016/j.jvs.2020.10.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 10/18/2020] [Indexed: 11/24/2022]
Abstract
BACKGROUND Poststent ballooning/angioplasty (post-SB) have been shown to increase the risk of stroke risk after transfemoral carotid artery stenting. With the advancement of transcarotid artery revascularization (TCAR) with dynamic cerebral blood flow reversal, we aimed to study the impact of post-SB during TCAR. METHODS Patients undergoing TCAR in the Vascular Quality Initiative between September 2016 and May 2019 were included and were divided into three groups: those who received prestent deployment angioplasty only (pre-SB, reference group), those who received poststent deployment ballooning only (post-SB), and those who received both prestent and poststent deployment ballooning (prepost-SB). Patients who did not receive any angioplasty during their procedure (n = 367 [6.7%]) were excluded because these represent a different group of patients with less complex lesions than those requiring angioplasty. Primary outcome was in-hospital stroke or death. Analysis was performed using univariable and multivariable logistic regression models. RESULTS Of 5161 patients undergoing TCAR, 34.7% had pre-SB only, 25% had post-SB only, and 40.3% had both (prepost-SB). No differences in the rates of in-hospital and 30-day stroke, death, and stroke/death were observed among the three groups; in-hospital stroke/death in the pre-SB group was 1.4% (n = 25), post-SB 1.2% (n = 16), and prepost-SB 1.4% (n = 29; P = .92). However, patients undergoing post-SB and prepost-SB had higher rates of in-hospital transient ischemic attacks (TIA) (post-SB, 0.9%; prepost-SB, 1% vs pre-SB, 0.2%, P < .01) and postprocedural hypotension (16.6% and 16.8% vs 13.1%, respectively; P < .001). Post-SB also had longer operative times, as well as flow reversal and fluoroscopy times. On multivariable analysis, no association was seen between post-SB and the primary outcome of in-hospital stroke/death (post-SB odds ratio [OR], 0.88; 95% confidence interval [CI], 0.44-1.73; prepost-SB OR, 0.98; 95% CI, 0.57-1.70). Similarly, no significant differences were noted in terms of postprocedural hemodynamic instability and 30-day outcomes. However, post-SB and prepost-SB were associated with four times the odds of in-hospital TIA compared with pre-SB alone (post-SB OR, 4.24 [95% CI, 1.51-11.8]; prepost-SB OR, 4.76 [95% CI, 1.53-14.79]; P = .01). Symptomatic patients had higher rates of in-hospital stroke/death compared with their asymptomatic counterparts; however, there was no significant interaction between symptomatic status and ballooning in predicting the primary outcome. CONCLUSIONS Post-SB was used in 65.3% of TCAR patients. This maneuver seems to be safe without an increase in the odds of postoperative in-hospital stroke/death. However, the increased rates of TIA associated with post-SB requires further investigation.
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Affiliation(s)
- Hanaa Dakour-Aridi
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Diego, Calif
| | - Christina L Cui
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Diego, Calif
| | - Andrew Barleben
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Diego, Calif
| | - Marc L Schermerhorn
- Division of Vascular and Endovascular Surgery, Beth Israel Deaconess Medical Center, Boston, Mass
| | | | - Mahmoud B Malas
- Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Diego, Calif.
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