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Jee TK, Yeon JY, Kim KH, Kim JS, Jeon P. Flow Diversion for Cerebral Aneurysms: A Decade-Long Experience with Improved Outcomes and Predictors of Success. Brain Sci 2024; 14:847. [PMID: 39199538 PMCID: PMC11353241 DOI: 10.3390/brainsci14080847] [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: 07/22/2024] [Revised: 08/15/2024] [Accepted: 08/19/2024] [Indexed: 09/01/2024] Open
Abstract
BACKGROUND Flow diversion has significantly improved the management of cerebral aneurysms. Technological advancements and increased clinical experience over the past decade have led to better outcomes and fewer complications. This study provides updated results and examines the factors that influence the success of flow diversion. METHODS We reviewed records of 115 patients with 121 intracranial aneurysms treated from July 2014 to August 2023. All patients had unruptured aneurysms in the anterior and posterior circulation. RESULTS Complete aneurysm occlusion was achieved in 72.7% of cases, with a complication rate of 9.1%. Significant predictors of complete occlusion included aneurysm diameter (OR = 0.89, 95% CI 0.82-0.97, p = 0.009) and the presence of incorporated branches (OR = 0.22, 95% CI 0.08-0.59, p = 0.003). Cox analysis identified neck diameter (HR = 0.92, 95% CI 0.87-0.98, p = 0.009) and incorporated branch (HR = 0.40, 95% CI 0.24-0.69, p = 0.001) as significant for occlusion. Multivariable analysis identified aneurysm diameter (OR = 1.21, 95% CI 1.09-1.37, p = 0.001) as significant for safety outcomes. Improved outcomes were observed in recent treatments, with higher occlusion rates (79.7% vs. 61.7%, p = 0.050) and lower complication rates (4.1% vs. 14.9%, p = 0.011). CONCLUSIONS Enhanced technical proficiency, better devices, and refined patient selection have significantly improved the efficacy and safety of flow diversion for cerebral aneurysms. Identifying significant predictors for treatment success and safety outcomes can inform clinical practice, aiding in patient selection.
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Affiliation(s)
- Tae Keun Jee
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea; (T.K.J.); (J.Y.Y.)
| | - Je Young Yeon
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea; (T.K.J.); (J.Y.Y.)
| | - Keon Ha Kim
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea
| | - Jong-Soo Kim
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea; (T.K.J.); (J.Y.Y.)
| | - Pyoung Jeon
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea
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Ramirez-Velandia F, Enriquez-Marulanda A, Filo J, Fodor TB, Sconzo D, Mensah E, Young M, Muram S, Granstein JH, Shutran M, Taussky P, Ogilvy CS. A Novel Scoring System Predicting Aneurysm Incomplete Occlusion After Flow Diversion: A 10-Year Experience. World Neurosurg 2024:S1878-8750(24)01323-8. [PMID: 39094933 DOI: 10.1016/j.wneu.2024.07.183] [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: 05/08/2024] [Revised: 07/23/2024] [Accepted: 07/24/2024] [Indexed: 08/04/2024]
Abstract
BACKGROUND Factors impacting the rate of aneurysm occlusion after flow diversion (FD) have been well described in the literature. In this article, we sought to evaluate those variables to develop and validate a scoring system predicting aneurysm incomplete occlusion after FD. METHODS Retrospective review of patients with intracranial aneurysms treated with FD at a single institution between March 2013 and March 2023. Multivariable logistic regression model was developed using factors associated with aneurysm incomplete occlusion. The ABC scoring system consisted of: Age (<60 years old: 0, 60-69 years: 1, 70-79: 2, and ≥80: 3), Branch coming out of the aneurysm dome/neck (yes: 2, no: 0), and Cigarette smoking history (never smoker: 1, current or past smoker: 0). The scoring system performance was evaluated with receiver operating characteristic curve and calculating the area under the curve. RESULTS A total of 449 patients with 563 aneurysms treated in 482 procedures were evaluated. Most cases were females (81.7%) with a median age of 59 years old. At a median follow-up of 13.2 months, 84.0% of aneurysms were completely or near-complete occluded. The scoring system had an area under the curve of 0.71. A value ≥ 2, reached a sensitivity of 74.4%, a specificity of 60.9%, a likelihood ratio+ of 1.90, and proved to be reliable in predicting the risk of incomplete occlusion (odds ratio = 4.53; 95% confidence interval: 2.73-7.54; P < 0.001). CONCLUSIONS The proposed ABC scoring system can be used to evaluate the risk of aneurysm incomplete occlusion after treatment with FD, identifying patients who would benefit from adjunctive coiling or alternative treatment modalities.
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Affiliation(s)
- Felipe Ramirez-Velandia
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | | | - Jean Filo
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Thomas B Fodor
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Daniel Sconzo
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Emmanuel Mensah
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Michael Young
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Sandeep Muram
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Justin H Granstein
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Max Shutran
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Philipp Taussky
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Christopher S Ogilvy
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.
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Wang J, Deng X, Li D, Yang Z, Guo XB. Pipeline embolization of complex, wide-necked middle cerebral artery bifurcation aneurysms: A single-center experience. Interv Neuroradiol 2024; 30:227-233. [PMID: 35876346 PMCID: PMC11095361 DOI: 10.1177/15910199221115924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/23/2022] [Accepted: 06/27/2022] [Indexed: 11/16/2022] Open
Abstract
PURPOSE To evaluate the performance of Pipeline Embolization Device (PED) in complex, wide-necked middle cerebral artery (MCA) bifurcation aneurysms. METHODS We performed a retrospective review of patients treated with PED for complex, wide-necked MCA bifurcation aneurysms between August 2016 and March 2021. In addition to demographic data, we collected aneurysmal neck width, dome-to-neck ratio, complications, and clinical and angiographic follow-up. The embolization degree of aneurysms was evaluated by O'Kelly-Marotta (OKM) grading scale, and the prognosis was assessed with the modified Rankin Scale (mRS). RESULTS From August 2016 to March 2021, a total of 46 patients with 49 MCA bifurcation aneurysms in our center were enrolled, of whom all received PEDs successfully. The O'Kelly-Marotta (OKM) grading showed that post-procedure 15 patients (32.6%) were grade C, another 8 patients (17.4%) were grade D. Aneurysms with small remnant or complete occlusion were 50%, symptomatic ischemic events occurred in 3 (6.5%), and bleeding events in 1 (2.2%). 41 patients underwent a 6-month angiography follow-up, in which 7 patients (17.1%) remained OKM grade C and 30 patients (73.2%) achieved OKM grade D. Complete occlusion and small remnant aneurysms were up to 90.3%. 40 (97.6%) patients' mRS scores were 0, and 1 (2.4%) patient was 2. No new bleeding and ischemic events occurred during the 6-month. CONCLUSIONS The Pipeline Embolization Device provides a safe and effective treatment alternative for complex, wide-necked MCA aneurysms. A larger number with longer-term follow-up data is needed for further verification.
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Affiliation(s)
- Jingjing Wang
- Department of Neuro-interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xin Deng
- Department of Neuro-interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Dong Li
- Department of Neuro-interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zhen Yang
- Department of Neuro-interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xin-bin Guo
- Department of Neuro-interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Ramirez-Velandia F, Young M, Alwakaa O, Han K, Ogilvy CS. Flow Diversion as a Definitive Treatment for Recurrently Ruptured A1-A2 Anterior Cerebral Artery Aneurysm Following Clipping and Coiling. Cureus 2024; 16:e57103. [PMID: 38681287 PMCID: PMC11054312 DOI: 10.7759/cureus.57103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Accepted: 03/27/2024] [Indexed: 05/01/2024] Open
Abstract
Even after clipping of intracranial aneurysms, patients may experience incomplete occlusion or the future recurrence of their treated aneurysm. This paper presents a distinctive case of a recurrent A1-A2 anterior cerebral artery aneurysm that underwent four interventions over 16 years. The aneurysm was treated with two clippings, subsequent coiling, and flow diversion for definitive treatment. The challenges encountered in managing bifurcation aneurysms are discussed, emphasizing the importance of considering hemodynamic factors, vessel geometry, and recurrence risk factors in treatment decisions. The case highlights the need for closer follow-up of ruptured bifurcation aneurysms due to the higher likelihood of recurrence. The role of flow diverters in reinforcing vessel anatomy and preventing recurrence is also highlighted.
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Affiliation(s)
- Felipe Ramirez-Velandia
- Neurological Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
| | - Michael Young
- Neurological Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
| | - Omar Alwakaa
- Neurological Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
| | - Kimberly Han
- Neurological Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
| | - Christopher S Ogilvy
- Neurological Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
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5
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Fisher WAM, David CA. Microsurgical Management of Internal Carotid Artery Bifurcation Aneurysm After Failure of Endovascular Coiling and Flow Diversion: 2-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2024:01787389-990000000-01052. [PMID: 38329341 DOI: 10.1227/ons.0000000000001081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/17/2023] [Indexed: 02/09/2024] Open
Abstract
We describe the case of a 51-year-old woman who underwent craniotomy and surgical clipping of a large internal carotid bifurcation aneurysm that was refractory to treatment with 2 rounds of endovascular coiling and internal carotid artery (ICA) to middle cerebral artery pipeline placement. The patient initially presented in 2004 with a 3-week history of sudden-onset headache with associated nausea. Computed tomography and lumbar puncture on presentation in 2004 were negative for subarachnoid hemorrhage. Digital subtraction angiography, however, demonstrated a large left ICA bifurcation aneurysm. The decision was made to proceed with endovascular coiling of the aneurysm. Six-month and 1-year follow-up imaging showed incomplete resolution of the aneurysm, and retreatment coiling was completed in 2005. After recoiling in 2005, the patient was lost to follow-up. During this period, she underwent pipeline placement from the ICA to the middle cerebral artery across the A1 segment at a different institution. Two years after flow diversion, the patient was referred back to our institution with further worsening of the aneurysm. Our surgical team opted for craniotomy and surgical clipping given the limited management options that this extremely complex case now presented. The patient consented to the procedure. Postoperative imaging demonstrated marked improvement in aneurysm severity. Although the current neurosurgical trend favors endovascular treatment over craniotomy, this case shows the vital importance of craniotomy and aneurysm clipping in the treatment of select patients. We also provide high-quality operative video of aneurysm clipping.1-7.
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Affiliation(s)
- Wilson A M Fisher
- University of North Carolina School of Medicine, Department of Neurosurgery, Chapel Hill, North Carolina, USA
| | - Carlos A David
- Department of Neurosurgery, University of North Carolina, Chapel Hill, North Carolina, USA
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Kashkoush A, El-Abtah ME, Davison MA, Toth G, Moore N, Bain M. Repeat Flow Diversion for Retreatment of Incompletely Occluded Large Complex Symptomatic Cerebral Aneurysms: A Retrospective Case Series. Oper Neurosurg (Hagerstown) 2024:01787389-990000000-01027. [PMID: 38251895 DOI: 10.1227/ons.0000000000001056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 12/01/2023] [Indexed: 01/23/2024] Open
Abstract
BACKGROUND AND OBJECTIVES Data regarding radiographic occlusion rates after repeat flow diversion after initial placement of a flow diverter (FD) in large intracranial aneurysms are limited. We report clinical and angiographic outcomes on 7 patients who required retreatment with overlapping FDs after initial flow diversion for large intracranial aneurysms. METHODS We performed a retrospective review of a prospectively maintained database of cerebrovascular procedures performed at our institution from 2017 to 2021. We identified patients who underwent retreatment with overlapping FDs for large (>10 mm) cerebral aneurysms after initial flow diversion. At last angiographic follow-up, occlusion grade was evaluated using the O'Kelly-Marotta (OKM) grading scale. RESULTS Seven patients (median age 57 years) with cerebral aneurysms requiring retreatment were identified. The most common aneurysm location was the ophthalmic internal carotid artery (n = 3) and basilar trunk (n = 3). There were 4 fusiform and 3 saccular aneurysms. The median aneurysm width was 18 mm; the median neck size for saccular aneurysms was 7 mm; and the median dome-to-neck ratio was 2.8. The median time to retreatment was 9 months, usually due to symptomatic mass effect. After retreatment, the median clinical follow-up was 36 months, MRI/magnetic resonance angiography follow-up was 15 months, and digital subtraction angiography follow-up was 14 months. Aneurysm occlusion at last angiographic follow-up was graded as OKM A (total filling, n = 1), B (subtotal filling, n = 2), C (early neck remnant, n = 3), and D (no filling, n = 0). All patients with symptomatic improvement were OKM C, whereas patients with worsened symptom burden were OKM A or B. Two patients required further open surgical management for definitive management of the aneurysm remnant. CONCLUSION Although most patients demonstrated a decrease in aneurysm remnant size, many had high-grade persistent filling (OKM grades A or B) in this subset of mostly large fusiform aneurysms. Larger studies with longer follow-up are warranted to optimize treatment strategies for atypical aneurysm remnants after repeat flow diversion.
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Affiliation(s)
- Ahmed Kashkoush
- Department of Neurological Surgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Cerebrovascular Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Mohamed E El-Abtah
- Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Mark A Davison
- Department of Neurological Surgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Cerebrovascular Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Gabor Toth
- Cerebrovascular Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA
- Department of Neurology, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Nina Moore
- Department of Neurological Surgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Cerebrovascular Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA
| | - Mark Bain
- Department of Neurological Surgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Cerebrovascular Center, Cleveland Clinic Foundation, Cleveland, Ohio, USA
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Long S, Shi S, Tian Q, Wei Z, Ma J, Wang Y, Yang J, Han X, Li T. Correlation of Flow Diverter Malapposition at the Aneurysm Neck with Incomplete Aneurysm Occlusion in Patients with Small Intracranial Aneurysms: A Single-Center Experience. AJNR Am J Neuroradiol 2023; 45:16-21. [PMID: 38164561 PMCID: PMC10756576 DOI: 10.3174/ajnr.a8079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 10/29/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND AND PURPOSE Flow diversion treatment repairs aneurysms by altering the hemodynamics of the aneurysmal sac and providing a scaffold for endothelial cell adhesion. The purpose of this study was to investigate the correlation of flow diverter (FD) malapposition at the aneurysm neck with incomplete occlusion of small intracranial aneurysms (IAs) and investigate other factors that are possibly related to incomplete occlusion. MATERIALS AND METHODS From January 2019 to June 2022, the clinical and imaging data for 153 patients (175 aneurysms) with unruptured small IAs treated with flow diversion were retrospectively analyzed. FD apposition at the aneurysm neck was evaluated by high-resolution conebeam CT (HR-CBCT), and the complete occlusion rate for aneurysms was judged according to the latest follow-up conventional angiography findings (≥6 months). Multivariate logistic regression analysis was used to determine factors associated with incomplete aneurysm occlusion. RESULTS In total, 159 FDs were implanted in 153 patients. HR-CBCT performed after the deployment revealed FD malapposition at the aneurysm neck in 18 cases. According to the latest follow-up angiograms (average: 9.47 ± 3.35 months), the complete aneurysm occlusion rate was 66.9%. The complete occlusion rates for incomplete and complete stent apposition at the neck were 38.9% (7/18) and 70.1% (110/157), respectively. The results of regression analysis showed that an aneurysm sac with branch vessels (OR, 2.937; P = .018), incomplete stent apposition at the aneurysm neck (OR, 3.561; P = .023), and a large aneurysm diameter (OR, 1.533; P = .028) were positive predictors of incomplete aneurysm occlusion. CONCLUSIONS An aneurysm sac with branch vessels, a large aneurysm diameter, and malapposition at the aneurysm neck significantly affect aneurysm repair after FD stent-only treatment for small IAs.
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Affiliation(s)
- Shuhai Long
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Shuailong Shi
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Qi Tian
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zhuangzhuang Wei
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ji Ma
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ye Wang
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jie Yang
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xinwei Han
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Tengfei Li
- From the Department of Interventional Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
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Naylor RM, Abbasi M, Brinjikji W, Cloft HJ, Kallmes DF, Lanzino G. Long-term outcomes following pipeline embolization of unruptured aneurysms. Acta Neurochir (Wien) 2023:10.1007/s00701-023-05619-1. [PMID: 37191722 DOI: 10.1007/s00701-023-05619-1] [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: 01/18/2023] [Accepted: 05/05/2023] [Indexed: 05/17/2023]
Abstract
BACKGROUND Flow diversion using the pipeline embolization device (PED) for unruptured aneurysms is associated with high occlusion and low morbidity and mortality. However, most reports have limited follow-up of 1-2 years. Therefore, we sought to report our outcomes after PED for unruptured aneurysms in patients with at least 5-years of follow-up. METHODS Review of patients undergoing PED for unruptured aneurysms from 2009 to 2016. RESULTS Overall, 135 patients with 138 aneurysms were included for analysis. Seventy-eight percent of aneurysms (n=107) over a median radiographic follow-up of 5.0 years underwent complete occlusion. Among aneurysms with at least 5-years of radiographic follow-up (n=71), 79% (n=56) achieved complete obliteration. No aneurysm recanalized after radiographic obliteration. Furthermore, over a median clinical follow-up period of 4.9 years, 84% of patients (n=115) self-reported mRS scores between 0 and 2. For patients with at least 5-years of clinical follow-up, 88% (n=61) reported mRS between 0 and 2. In total, 3% (n=4) of patients experienced a major, non-fatal neurologic complication related to the PED, 5% (n=7) of patients experienced a minor neurologic complication related to PED placement, and 2% (n=3) died from either delayed aneurysm rupture, delayed ipsilateral hemorrhage after PED placement, or delayed (9 months after treatment) neural compression after progressive thrombosis of a PED-treated dolichoectactic vertebrobasilar aneurysm. CONCLUSIONS Treatment of unruptured aneurysms with the PED is associated with high rates of long-term angiographic occlusion and low, albeit clinically important, rates of major neurologic morbidity and mortality. Thus, flow diversion via PED placement is safe, effective, and durable.
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Affiliation(s)
- Ryan M Naylor
- Department of Neurosurgery, Mayo Clinic, 200 First St. SW, Rochester, MN, 55905, USA
| | - Mehdi Abbasi
- Department of Radiology, Mayo Clinic, Rochester, MN, USA
- Department of Neurology, Yale University, New Haven, CT, USA
| | | | - Harry J Cloft
- Department of Radiology, Mayo Clinic, Rochester, MN, USA
| | | | - Giuseppe Lanzino
- Department of Neurosurgery, Mayo Clinic, 200 First St. SW, Rochester, MN, 55905, USA.
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9
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Vladev G, Sirakov A, Sirakova K, Sirakov SS. Mechanical Comaneci 17-stent angioplasty for a sub-optimally deployed flow-diverter stent. Interv Neuroradiol 2022:15910199221149633. [PMID: 36583607 DOI: 10.1177/15910199221149633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Flow diverter stents are increasingly used as the sole endovascular treatment method for complex or wide-necked intracranial aneurysms.1 Technical complications related to stent deployment are infrequently reported in the literature. During treatment, implant misbehaviors may occur, including incomplete tubular expansion with insufficient aneurysmal coverage and wall apposition, proximal or distal narrowing, and twisting along the axis.2- 4 Little is known about this phenomenon, especially if it relates to the operator experience, deployment techniques, different devices, and implant properties. The management of these complications requires technical precision and is often remediated by "massaging" the stent with the delivery system, balloon angioplasty, or placement of additional self-expandable stents. Lastly, if critically damaged, the stent could be taken out of the vessel with a combination of maneuvers called "stentectomy."5 These techniques often necessitate multiple navigations and the utilization of a larger microcatheter. We aim to highlight the feasibility of Comaneci 17 stent-angioplasty as an effective bailout strategy for inadequately deployed flow diverter stents. The suggested approach's technical aspects, including pros and cons, have been discussed.
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Affiliation(s)
- Georgi Vladev
- Radiology Department, 266309UH St Ivan Rilski, Sofia, Bulgaria
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10
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Abdelkhalek H, Abdelhameed EA, Zakarea A, El Malky I. Predictors of flow diverter stent in large and giant unruptured intracranial aneurysms, single-center experience. Neurol Sci 2022; 43:6399-6405. [PMID: 35984605 PMCID: PMC9616764 DOI: 10.1007/s10072-022-06336-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 08/07/2022] [Indexed: 11/29/2022]
Abstract
Background Flow diversion with or without coiling has been established as the treatment of choice for large unruptured aneurysms. This study aims to assess possible predictors for radiological and clinical outcome such as location of the aneurysm (anterior or posterior circulation), complexity by a branching artery, bifurcation, and adjuvant coiling. Methods This study was conducted on 65 consecutive patients with 65 large, unruptured intracranial aneurysms (size ≥ 10 mm) treated with flow diverters. Follow-up angiography was done for 60 patients (92.3%) at 12 ± 8.6 months range from 3 to 36 months. Results Complete occlusion was achieved in 50 from 60 aneurysms (83.4%), while 8 aneurysms (13.3%) had neck remnant, and another two aneurysms (3.3%) remained with aneurysmal remnant. Periprocedural complications were encountered in 14 patients (21.5%) with morbidity in six patients (9.2%) and mortality in one patient (1.5%). In a multivariate logistic regression, anterior versus posterior location was less likely associated with worse outcome; adjusted OR (95% CI) of 0.16 (0.07–0.01), p = 0.006. Complete occlusion in complex aneurysms with branching artery was 60% versus 88% in simple aneurysms without branching artery (p-value = 0.04). Conclusions Flow diverter deployment of a large, unruptured aneurysm in the anterior circulation might have a better outcome than one in the posterior circulation. Flow diverter of aneurysms with branching artery or at bifurcation might be associated with aneurysm persistence and complications respectively.
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Affiliation(s)
| | | | - Ayman Zakarea
- Department of Radiology, Kasr Alainy University, Cairo, Egypt
| | - Islam El Malky
- Department of Neurology, South Valley University, Qena, Egypt.
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11
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Li S, Zeng C, Tao W, Huang Z, Yan L, Tian X, Chen F. The Safety and Efficacy of Flow Diversion versus Conventional Endovascular Treatment for Intracranial Aneurysms: A Meta-analysis of Real-world Cohort Studies from the Past 10 Years. AJNR Am J Neuroradiol 2022; 43:1004-1011. [PMID: 35710123 DOI: 10.3174/ajnr.a7539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/16/2022] [Indexed: 11/07/2022]
Abstract
BACKGROUND Although the flow diverter has advantages in the treatment of intracranial aneurysms, pooled studies that directly compare it with conventional endovascular treatments are rare. PURPOSE Our aim was to compare the safety and efficacy of flow-diverter and conventional endovascular treatments in intracranial aneurysms. DATA SOURCES We performed a comprehensive search of the literature using PubMed, EMBASE, and the Cochrane Database. STUDY SELECTION We included only studies that directly compared the angiographic and clinical outcomes of flow-diverter and conventional endovascular treatments. DATA ANALYSIS Random effects or fixed effects meta-analysis was used to pool the cumulative rate of short- and long-term angiographic and clinical outcomes. DATA SYNTHESIS Eighteen studies with 1001 patients with flow diverters and 1133 patients with conventional endovascular treatments were included; 1015 and 1201 aneurysm procedures were performed, respectively. The flow-diverter group had aneurysms of a larger size (standard mean difference, 0.22; 95% CI, 0.03-0.41; P = .026). There was a higher risk of complications in the flow-diverter group compared with the conventional endovascular group (OR, 1.4; 95% CI, 1.01-1.96; P = .045) during procedures. The follow-up angiographic results of flow-diverter treatment indicated a higher rate of complete occlusion (OR, 2.55; 95% CI, 1.70-3.83; P < .001) and lower rates of recurrence (OR, 0.24; 95% CI, 0.12-0.46; P < .001) and retreatment (OR, 0.31; 95% CI, 0.21-0.47; P < .001). LIMITATIONS Limitations include a retrospective, observational design in some studies, high heterogeneity, and selection bias. CONCLUSIONS Compared with the conventional endovascular treatments, the placement of a flow diverter may lead to more procedure-related complications, but there is no difference in safety, and it is more effective in the long term.
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Affiliation(s)
- S Li
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - C Zeng
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - W Tao
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Z Huang
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - L Yan
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - X Tian
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - F Chen
- From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
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12
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Chung CY, Peterson RB, Howard BM, Zygmont ME. Imaging Intracranial Aneurysms in the Endovascular Era: Surveillance and Posttreatment Follow-up. Radiographics 2022; 42:789-805. [PMID: 35333634 DOI: 10.1148/rg.210131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
While most intracranial aneurysms (IAs) remain asymptomatic over a patient's lifetime, those that rupture can cause devastating outcomes. The increased usage and quality of neuroimaging has increased detection of unruptured IAs and driven an increase in surveillance and treatment of these lesions. Standard practice is to treat incidentally discovered unruptured IAs that confer high rupture risk as well as ruptured IAs to prevent rehemorrhage. IAs are increasingly treated with coil embolization instead of microsurgical clipping; more recently, flow diversion and intrasaccular flow disruption have further expanded the versatility and utility of endovascular IA treatment. Imaging is increasingly used for posttreatment IA follow-up in the endovascular era. While cerebral angiography remains the standard for IA characterization and treatment planning, advances in CT and CT angiography and MR angiography have improved the diagnostic accuracy of noninvasive imaging for initial diagnosis and surveillance. IA features including size, dome-to-neck ratio, location, and orientation allow rupture risk stratification and determination of optimal treatment strategy and timing. The radiologist should be familiar with the imaging appearance of common IA treatment devices and the expected imaging findings following treatment. In distinction to clipping and coil embolization, flow diversion and intrasaccular flow disruption induce progressive aneurysm obliteration over months to years. Careful assessment of the device; the treated IA; adjacent brain, bone, meninges; and involved extracranial and intracranial vasculature is crucial at posttreatment follow-up imaging to confirm aneurysm obliteration and identify short-term and long-term posttreatment complications. An invited commentary by Chatterjee is available online. Online supplemental material and the slide presentation from the RSNA Annual Meeting are available for this article. ©RSNA, 2022.
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Affiliation(s)
- Charlotte Y Chung
- From the Departments of Radiology and Imaging Sciences (C.Y.C., R.B.P., B.M.H., M.E.Z.) and Neurosurgery (B.M.H.), Emory University School of Medicine, Atlanta, Ga
| | - Ryan B Peterson
- From the Departments of Radiology and Imaging Sciences (C.Y.C., R.B.P., B.M.H., M.E.Z.) and Neurosurgery (B.M.H.), Emory University School of Medicine, Atlanta, Ga
| | - Brian M Howard
- From the Departments of Radiology and Imaging Sciences (C.Y.C., R.B.P., B.M.H., M.E.Z.) and Neurosurgery (B.M.H.), Emory University School of Medicine, Atlanta, Ga
| | - Matthew E Zygmont
- From the Departments of Radiology and Imaging Sciences (C.Y.C., R.B.P., B.M.H., M.E.Z.) and Neurosurgery (B.M.H.), Emory University School of Medicine, Atlanta, Ga
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13
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Roloff C, Berg P. Effect of flow diverter stent malposition on intracranial aneurysm hemodynamics—An experimental framework using stereoscopic particle image velocimetry. PLoS One 2022; 17:e0264688. [PMID: 35235597 PMCID: PMC8890739 DOI: 10.1371/journal.pone.0264688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 02/15/2022] [Indexed: 12/04/2022] Open
Abstract
Background Flow-diverting stents are increasingly used for the minimally-invasive treatment of intracranial aneurysms. However, a correct positioning of such devices can be challenging due to varying vessel diameters as well as the complex anatomy of the neurovasculature. As a consequence, unsuccessful treatment outcomes are increasingly reported requiring an improvement of the understanding of stent-induced flow modification. Methods To evaluate the effect of different degrees of flow diverter stent malposition on intra-aneurysmal hemodynamic changes, a controlled hemodynamic configuration was created using an idealized intracranial aneurysms model. Afterwards, four different treatment scenarios were reproduced comprising of 1) the ideal treatment, 2) an insufficient wall apposition in the region of the ostium, 3) a distorted device migrating into the aneurysm sac and 4) an inaccurately deployed stent due to wrong release location. For the assessment of the individual flow modifications, high-resolution stereoscopic particle image velocimetry (PIV) measurements were carried out. Results The analysis of the precise in-vitro PIV measurements reveals that in all cases a considerable reduction of the cycle-averaged and peak-systolic velocity was obtained. Compared to the untreated aneurysm configuration, the flow reduction ranged from 63% (scenario 4) up to 89% (scenario 3). The ideal treatment reached a reduction of 78%, which is known to be sufficient for a successful therapy. However, inaccurate device positioning leads to increased oscillating flow towards the lateral directions reducing the chances of sufficient thrombus formation. Conclusions High-resolution in-vitro PIV measurements enable an accurate quantification of the treatment efficacy for flow-diverting devices. Furthermore, insufficient treatment outcomes can be reproduces allowing for an assessment of intra-aneurysmal hemodynamic changes.
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Affiliation(s)
- Christoph Roloff
- Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, Germany
| | - Philipp Berg
- Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, Germany
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, Germany
- * E-mail:
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14
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Akiyama T, Imamura H, Goto M, Fukumitsu R, Sunohara T, Matsumoto S, Fukui N, Omura Y, Fukuda T, Go K, Kajiura S, Shigeyasu M, Asakura K, Horii R, Naramoto Y, Nishii R, Yamamoto Y, Sakai C, Sakai N. Pipeline flow diversion with adjunctive coil embolization for internal carotid artery aneurysms following an intradural component: results in 46 consecutive aneurysms from a Japanese single-center experience. Neurosurg Rev 2022; 45:2221-2230. [PMID: 35066661 DOI: 10.1007/s10143-021-01719-7] [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] [Received: 06/08/2021] [Revised: 10/19/2021] [Accepted: 12/13/2021] [Indexed: 10/19/2022]
Abstract
In the treatment of an intracranial aneurysm with the flow diverter, the combined use of coil embolization can help promote subsequent progressive thrombosis within the aneurysm sac and reduce the risk of delayed aneurysm rupture. This study retrospectively reviewed outcomes of patients who had undergone the Pipeline Embolization Device (PED) with adjunctive coil embolization (PED/coil) at a single center to determine its safety and efficiency. Patients with internal carotid artery aneurysms following an intradural component were selected for PED/coil between 2015 and 2020. All patients were premedicated with dual antiplatelet therapy of aspirin plus clopidogrel or prasugrel. A minimal number of PEDs were deployed, with coils inserted using a stent-jail technique, avoiding dense packing. A total of 46 aneurysms (43 patients; median dome size, 11.6 mm; median neck width, 6.3 mm) were treated with PED/coil. The median volume embolization ratio was 14.8%. The degree of angiographic filling at the 6-month and latest angiography showed complete occlusion in 60.5% (26/43) and 70.5% (31/44), respectively. Small (< 10 mm) aneurysms achieved a higher complete occlusion rate in the early period; a lower cumulative incidence of aneurysm occlusion was observed in large and giant (≥ 10 mm) aneurysms (P = .024). The median clinical follow-up was 22 months, and no aneurysm ruptures occurred. Favorable clinical outcomes were achieved, with permanent neurological morbidity of 4.7% and no mortality. PED/coil demonstrated a high angiographic occlusion rate at an early stage. Loosely packed coils are sufficient to obliterate aneurysms effectively.
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Affiliation(s)
- Tomoaki Akiyama
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan.
| | - Hirotoshi Imamura
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Masanori Goto
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Ryu Fukumitsu
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Tadashi Sunohara
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Shirabe Matsumoto
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Nobuyuki Fukui
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Yoshihiro Omura
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Tatsumaru Fukuda
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Koichi Go
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Shinji Kajiura
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Masashi Shigeyasu
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Kento Asakura
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Ryo Horii
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Yuji Naramoto
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Rikuo Nishii
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Yasuhiro Yamamoto
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Chiaki Sakai
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Nobuyuki Sakai
- Department of Neurosurgery, Kobe City Medical Center General Hospital, 2-1-1 Minatojima-Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
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15
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Hanel RA, Monteiro A, Nelson PK, Lopes DK, Kallmes DF. Predictors of incomplete aneurysm occlusion after treatment with the Pipeline Embolization Device: PREMIER trial 1 year analysis. J Neurointerv Surg 2021; 14:1014-1017. [PMID: 34716215 DOI: 10.1136/neurintsurg-2021-018054] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 10/04/2021] [Indexed: 11/03/2022]
Abstract
BACKGROUND Flow diverters have revolutionized the treatment of intracranial aneurysms. Nevertheless, some aneurysms fail to occlude with flow diversion. The Prospective Study on Embolization of Intracranial Aneurysms with the Pipeline Device (PREMIER) was a prospective, multicenter and single-arm trial of small and medium wide-necked unruptured aneurysms. In the current study, we evaluate the predictors of treatment failure in the PREMIER cohort. METHODS We analyzed PREMIER patients who had incomplete occlusion (Raymond-Roy >1) at 1 year angiographic follow-up and compared them with those who achieved Raymond-Roy 1, aiming to identify predictors of treatment failure. RESULTS 25 aneurysms demonstrated incomplete occlusion at 1 year. There was a median reduction of 0.9 mm (IQR 0.41-2.43) in maximum diameter between pre-procedure and 1 year measurements, with no aneurysmal hemorrhage. Patients with incomplete occlusion were significantly older than those with complete occlusion (p=0.011). Smoking (p=0.045) and C6 segment location (p=0.005) were significantly associated with complete occlusion, while location at V4 (p=0.01) and C7 (p=0.007) and involvement of a side branch (p<0.001) were significantly associated with incomplete occlusion. In multivariable logistic regression, significant predictors of incomplete occlusion were non-smoker status (adjusted OR 4.49, 95% CI 1.11 to 18.09; p=0.03) and side branch involvement (adjusted OR 11.68, 95% CI 3.84 to 35.50; p<0.0001), while C6 location had reduced odds of incomplete occlusion (adjusted OR 0.29, 95% CI 0.10 to 0.84; p=0.02). CONCLUSIONS The results of our study are consistent with previous retrospective series and warrant consideration for technique adaptations to achieve higher occlusion rates. Further follow-up is needed to assess progression of aneurysm occlusion and clinical behavior in these cases.
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Affiliation(s)
- Ricardo A Hanel
- Cerebrovascular and Endovascular Surgery, Lyerly Neurosurgery and Baptist Medical Center, Jacksonville, FL, USA
| | - Andre Monteiro
- Cerebrovascular and Endovascular Surgery, Lyerly Neurosurgery and Baptist Medical Center, Jacksonville, FL, USA
| | - Peter K Nelson
- Radiology, NYU Langone Medical Center Neuroradiology Section, New York, New York, USA
| | - Demetrius K Lopes
- Brain and Spine Institute, Advocate Aurora Health, Park Ridge, Illinois, USA
| | - David F Kallmes
- Interventional Neuroradiology, Mayo Clinic, Rochester, Minnesota, USA
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16
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Prediction of atherosclerotic changes in cavernous carotid aneurysms based on computational fluid dynamics analysis: a proof-of-concept study. Neuroradiology 2021; 64:575-585. [PMID: 34505180 DOI: 10.1007/s00234-021-02803-x] [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: 05/03/2021] [Accepted: 09/01/2021] [Indexed: 10/20/2022]
Abstract
PURPOSE Recent computational fluid dynamics (CFD) studies have demonstrated the concurrence of atherosclerotic changes in regions exposed to prolonged blood residence. In this proof-of-concept study, we investigated a small but homogeneous cohort of large, cavernous carotid aneurysms (CCAs) to establish the clinical feasibility of CFD analysis in treatment planning, based on the association between pathophysiology and hemodynamics. METHODS This study included 15 patients with individual large CCAs. We identified calcifications, which indicated atherosclerotic changes, using the masking data of digital subtraction angiography. We conducted a CFD simulation under patient-specific inlet flow rates measured using magnetic resonance (MR) velocimetry. In the post-CFD analysis, we calculated the blood residence time ([Formula: see text]) and segmented the surface exposed to blood residence time over 1 s ([Formula: see text]). We measured the decrease in volume after flow diversion using the original time-of-flight MR angiography data. RESULTS Calcifications were observed in the region with [Formula: see text]. In addition, the ratio of [Formula: see text] to the surface of the aneurysmal domain exhibited a negative relationship with the rate of volume reduction at the 6- and 12-month follow-ups. Post-CFD visualization demonstrated that intra-aneurysmal swirling flow prolonged blood residence time under the condition of a small inlet flow rate, when compared to the aneurysmal volume. CONCLUSION The results of this study suggest the usefulness of CFD analysis for the diagnosis of atherosclerotic changes in large CCAs that may affect the therapeutic response after flow diversion.
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17
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In-silico trial of intracranial flow diverters replicates and expands insights from conventional clinical trials. Nat Commun 2021; 12:3861. [PMID: 34162852 PMCID: PMC8222326 DOI: 10.1038/s41467-021-23998-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 05/25/2021] [Indexed: 01/18/2023] Open
Abstract
The cost of clinical trials is ever-increasing. In-silico trials rely on virtual populations and interventions simulated using patient-specific models and may offer a solution to lower these costs. We present the flow diverter performance assessment (FD-PASS) in-silico trial, which models the treatment of intracranial aneurysms in 164 virtual patients with 82 distinct anatomies with a flow-diverting stent, using computational fluid dynamics to quantify post-treatment flow reduction. The predicted FD-PASS flow-diversion success rates replicate the values previously reported in three clinical trials. The in-silico approach allows broader investigation of factors associated with insufficient flow reduction than feasible in a conventional trial. Our findings demonstrate that in-silico trials of endovascular medical devices can: (i) replicate findings of conventional clinical trials, and (ii) perform virtual experiments and sub-group analyses that are difficult or impossible in conventional trials to discover new insights on treatment failure, e.g. in the presence of side-branches or hypertension. In-silico trials rely on virtual populations and interventions simulated using patient-specific models and may offer a solution to lower costs. Here, the authors present the flow diverter performance assessment in-silico trial, which models the treatment of intracranial aneurysms with a flow-diverting stent.
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18
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Perez-Raya I, Fathi MF, Baghaie A, Sacho R, D'Souza RM. Modeling and Reducing the Effect of Geometric Uncertainties in Intracranial Aneurysms with Polynomial Chaos Expansion, Data Decomposition, and 4D-Flow MRI. Cardiovasc Eng Technol 2021; 12:127-143. [PMID: 33415699 DOI: 10.1007/s13239-020-00511-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 12/16/2020] [Indexed: 11/27/2022]
Abstract
PURPOSE Variations in the vessel radius of segmented surfaces of intracranial aneurysms significantly influence the fluid velocities given by computer simulations. It is important to generate models that capture the effect of these variations in order to have a better interpretation of the numerically predicted hemodynamics. Also, it is highly relevant to develop methods that combine experimental observations with uncertainty modeling to get a closer approximation to the blood flow behavior. METHODS This work applies polynomial chaos expansion to model the effect of geometric uncertainties on the simulated fluid velocities of intracranial aneurysms. The radius of the vessel is defined as the uncertainty variable. Proper orthogonal decomposition is applied to characterize the solution space of fluid velocities. Next, a process of projecting the 4D-Flow MRI velocities on the basis vectors followed by coefficient mapping using generalized dynamic mode decomposition enables the merging of 4D-Flow MRI with the uncertainty propagated fluid velocities. RESULTS Polynomial chaos expansion propagates the fluid velocities with an error of 2% in velocity magnitude relative to computer simulations. Also, the bifurcation region (or impingement location) shows a standard deviation of 0.17 m/s (since an available reported variance in the vessel radius is adopted to model the uncertainty, the expected standard deviation may be different). Numerical phantom experiments indicate that the proposed approach reconstructs the fluid velocities with 0.3% relative error in presence of geometric uncertainties. CONCLUSION Polynomial chaos expansion is an effective approach to propagate the effect of the uncertainty variable in the blood flow velocities of intracranial aneurysms. Merging 4D-Flow MRI and uncertainty propagated fluid velocities leads to more realistic flow trends relative to ignoring the uncertainty in the vessel radius.
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Affiliation(s)
- Isaac Perez-Raya
- Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA.
| | - Mojtaba F Fathi
- Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Ahmadreza Baghaie
- Department of Electrical and Computer Engineering, New York Institute of Technology, Old Westbury, NY, 11568, USA
| | - Raphael Sacho
- Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Roshan M D'Souza
- Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
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19
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Enriquez-Marulanda A, Thomas AJ. Commentary: Failure of Flow Diverter Therapy: Predictors and Management Strategies. Neurosurgery 2020; 86:S74-S75. [PMID: 31838520 DOI: 10.1093/neuros/nyz410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 08/06/2019] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Ajith J Thomas
- Neurosurgical Service, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
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