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Charles JH, Desai S, Jean Paul A, Hassan A. Multimodal imaging approach for the diagnosis of intracranial atherosclerotic disease (ICAD): Basic principles, current and future perspectives. Interv Neuroradiol 2024; 30:105-119. [PMID: 36262087 PMCID: PMC10956456 DOI: 10.1177/15910199221133170] [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: 09/17/2022] [Accepted: 09/29/2022] [Indexed: 02/05/2023] Open
Abstract
PURPOSE To review the different imaging modalities utilized in the diagnosis of Intracranial Atherosclerotic Disease (ICAD) including their latest development and relevance in management of ICAD. METHODS A review of the literature was conducted through a search in google scholar, PubMed/Medline, EMBASE, Scopus, clinical trials.gov and the Cochrane Library. Search terms included, "imaging modalities in ICAD," "ICAD diagnostic," "Neuroimaging of ICAD," "Evaluation of ICAD". A summary and comparison of each modality's basic principles, advantages and disadvantages were included. RESULTS A total of 144 articles were identified and reviewed. The most common imaging used in ICAD diagnoses were DSA, CTA, MRA and TCD. They all had proven accuracy, their own benefits, and limitations. Newer modalities such as VWI, IVUS, OCT, PWI and CFD provide more detailed information regarding the vessel walls, plaque characteristics, and flow dynamics, which play a tremendous role in treatment guidance. In certain clinical scenarios, using more than one modality has been shown to be helpful in ICAD identification. The rapidly evolving software related to imaging studies, such as virtual histology, are very promising for the diagnostic and management of ICAD. CONCLUSIONS ICAD is a common cause of recurrent ischemic stroke. Its management can be both medical and/or procedural. Many different imaging modalities are used in its diagnosis. In certain clinical scenario, a combination of two more modalities can be critical in the management of ICAD. We expect that continuous development of imaging technique will lead to individualized and less invasive management with adequate outcome.
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Affiliation(s)
| | - Sohum Desai
- Department of Endovascular Surgical Neuroradiology, Valley Baptist Medical Center, Harlingen, Texas, USA
| | - Axler Jean Paul
- School of Medicine, State University of Haiti, Port Au Prince, Haiti
| | - Ameer Hassan
- Department of Endovascular Surgical Neuroradiology, Valley Baptist Medical Center, Harlingen, Texas, USA
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2
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Mekonnen EA, Tekle WG, Desai SK, Hassan AE. Angioplasty And stenting For symptomatic intracranial atherosclerotic disease: How I Do It. Interv Neuroradiol 2023; 29:459-465. [PMID: 35331035 PMCID: PMC10399498 DOI: 10.1177/15910199221090430] [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: 01/15/2022] [Accepted: 03/06/2022] [Indexed: 11/16/2022] Open
Abstract
Intracranial atherosclerotic disease (ICAD) is a common cause of acute ischemic stroke. ICAD has a high rate of recurrent ischemic stroke despite recommended adequate medical treatment. Endovascular treatment of ICAD has been controversial due to high periprocedural complication in historic randomized clinical trials (RCTs). Recently, a multicenter prospective study of stent placement in patients with high grade intracranial stenosis that evaluated safety and efficacy of Balloon-mounted stents (BMS) in symptomatic ICAD showed low rates of periprocedural stroke (5.6%) than the SAMMPRIS (14.7%) and VISSIT (21.4%) trials. This review highlights the recent evolution of endovascular therapy for symptomatic ICAD.
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Affiliation(s)
- Ermias A. Mekonnen
- Department of Neuroscience, Valley Baptist Medical Center, Harlingen, TX, USA
| | - Wondwossen G. Tekle
- Department of Neuroscience, Valley Baptist Medical Center, Harlingen, TX, USA
- Department of Neurology, School of Medicine, University of Texas Rio Grande Valley, Edinburg, TX, USA
| | - Sohum K. Desai
- Department of Neuroscience, Valley Baptist Medical Center, Harlingen, TX, USA
- Department of Neurology, School of Medicine, University of Texas Rio Grande Valley, Edinburg, TX, USA
| | - Ameer E. Hassan
- Department of Neuroscience, Valley Baptist Medical Center, Harlingen, TX, USA
- Department of Neurology, School of Medicine, University of Texas Rio Grande Valley, Edinburg, TX, USA
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3
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Akbarzadeh MA, Sanaie S, Kuchaki Rafsanjani M, Hosseini MS. Role of imaging in early diagnosis of acute ischemic stroke: a literature review. THE EGYPTIAN JOURNAL OF NEUROLOGY, PSYCHIATRY AND NEUROSURGERY 2021. [DOI: 10.1186/s41983-021-00432-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
AbstractStroke is a serious health condition that is responsible for more than 5% of total deaths. Near 20% of patients experiencing stroke die every year, resulting in the stroke being at the top of the list of preventable causes of death. Once an acute stroke is suspected, a golden hour of less than an hour is available to prevent the undesirable consequences. Since neuroimaging is mandatory in the diagnosis of stroke, the proper use of neuroimaging could help saving time and planning the right treatment for the patient. Some of the available imaging methods help us with rapid results, while others benefit us from a more accurate diagnosis. Hereby, we aim to provide a clinical review of the advantages and disadvantages of different available neuroimaging methods in approaching acute stroke to help clinicians choose the best method according to the settings.
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Tekle WG, Hassan AE. Intracranial Atherosclerotic Disease: Current Concepts in Medical and Surgical Management. Neurology 2021; 97:S145-S157. [PMID: 34785613 DOI: 10.1212/wnl.0000000000012805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Accepted: 03/05/2021] [Indexed: 11/15/2022] Open
Abstract
PURPOSE OF THE REVIEW This article reviews the current concepts in intracranial atherosclerotic disease (ICAD) as a common etiology of ischemic stroke; pathophysiologic mechanisms of ischemic stroke; diagnostic evaluation; and therapeutic modalities, including maximal medical therapy (MMT), percutaneous transluminal angioplasty and stenting (PTAS), and bypass surgery. RECENT FINDINGS Data from recent studies demonstrate that proper patient selection and timing of procedure and standardized PTAS techniques by experienced operators resulted in acceptably low periprocedural adverse events for patients who failed MMT. SUMMARY ICAD is a common cause of ischemic stroke. Complex pathology and high rates of recurrent and disabling ischemic strokes despite currently available treatments make ICAD the most challenging to treat of all ischemic stroke etiologies. Randomized trials previously showed that MMT, which involves the use of combinations of antiplatelet medications, targeted control of hypertension and serum low-density lipoprotein cholesterol, and adequate management of body weight through lifestyle modification, was superior to PTAS in decreasing rates of recurrent ischemic strokes from symptomatic ICAD. MMT performed better than expected, while periprocedural complications were significantly higher than expected in PTAS. Meanwhile, high rates of recurrent ischemic stroke despite MMT remain a great challenge. New clinical evidence continues to emerge on a safer application of PTAS, which is currently offered to a subset of patients who present with recurrent ischemic strokes despite MMT.
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Affiliation(s)
- Wondwossen G Tekle
- From the University of Texas Rio Grande Valley (W.G.T., A.E.H.), Edinburg; and Valley Baptist Medical Center (W.G.T., A.E.H.), Harlingen, TX.
| | - Ameer E Hassan
- From the University of Texas Rio Grande Valley (W.G.T., A.E.H.), Edinburg; and Valley Baptist Medical Center (W.G.T., A.E.H.), Harlingen, TX
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5
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Kleindorfer DO, Towfighi A, Chaturvedi S, Cockroft KM, Gutierrez J, Lombardi-Hill D, Kamel H, Kernan WN, Kittner SJ, Leira EC, Lennon O, Meschia JF, Nguyen TN, Pollak PM, Santangeli P, Sharrief AZ, Smith SC, Turan TN, Williams LS. 2021 Guideline for the Prevention of Stroke in Patients With Stroke and Transient Ischemic Attack: A Guideline From the American Heart Association/American Stroke Association. Stroke 2021; 52:e364-e467. [PMID: 34024117 DOI: 10.1161/str.0000000000000375] [Citation(s) in RCA: 1140] [Impact Index Per Article: 380.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Li H, Liu P, Liu P, Hua W, Yang W, Zhang Y, Zhang L, Xing P, Li Z, Zhang Y, Hong B, Yang P, Liu J. Current knowledge of large vascular occlusion due to intracranial atherosclerosis: focusing on early diagnosis. Chin Neurosurg J 2020; 6:32. [PMID: 33014427 PMCID: PMC7528346 DOI: 10.1186/s41016-020-00213-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 08/27/2020] [Indexed: 11/16/2022] Open
Abstract
Intracranial atherosclerosis (ICAS)-related large vascular occlusion (LVO) was an intractable subtype of acute ischemic stroke (AIS), which always needed rescue angioplasty and stenting and complicated the procedure of endovascular recanalization. Diagnosing ICAS-LVO accurately and early was helpful for both clinical treatment and trials. Digital subtraction angiography (DSA) was unable to provide an early and rapid diagnosis of ICAS-LVO based on current studies. A variety of pre-DSA methods had been used to distinguish ICAS-LVO with other subtypes of ischemic stroke, such as medical histories, clinical presentations, computed tomography or angiography (CT/CTA), and magnetic resonance imaging (MRI/MRA). This article briefly reviewed the status quo of the diagnosis and treatment of ICAS-LVO and summarized early diagnostic methods of ICAS-LVO from different aspects.
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Affiliation(s)
- He Li
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Peng Liu
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Pei Liu
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Weilong Hua
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Wenjin Yang
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Yongxin Zhang
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Lei Zhang
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Pengfei Xing
- Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Zifu Li
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Yongwei Zhang
- Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Bo Hong
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Pengfei Yang
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
| | - Jianmin Liu
- Department of Neurosurgery, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China.,Stroke Center, Changhai Hospital, Changhai Road Num. 168, Shanghai, 200433 China
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Apolipoproteins B and A1 in Ischemic Stroke Subtypes. J Stroke Cerebrovasc Dis 2020; 29:104670. [PMID: 32057650 DOI: 10.1016/j.jstrokecerebrovasdis.2020.104670] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 01/05/2020] [Accepted: 01/12/2020] [Indexed: 11/20/2022] Open
Abstract
INTRODUCTION Elevated serum apolipoprotein B and the apolipoprotein B/A1 ratio have been associated with ischemic stroke and intracranial atherosclerotic disease. We sought to assess the relationship between serum levels of apolipoprotein B, apolipoprotein A1, and the apolipoprotein B/A1 ratio with ischemic stroke subtypes and large artery atherosclerosis location. MATERIALS AND METHODS We evaluated serum apolipoprotein B and apolipoprotein A1 levels in consecutive, statin-naïve, adult ischemic stroke patients admitted to an academic medical center in southern India. We evaluated for differences in the mean serum levels of apolipoprotein B, apolipoprotein A1, and the apolipoprotein B/A1 ratio between patients with ischemic stroke attributed to intracranial atherosclerotic disease, extracranial atherosclerotic disease, small vessel disease, and cardioembolism. In secondary analysis, we assessed for differences in these serum apolipoproteins between patients with moderate-severe intracranial atherosclerotic disease and extracranial atherosclerotic disease, irrespective of ischemic stroke subtype. RESULTS Among the 156 ischemic stroke patients enrolled in this study, there were no significant differences in serum levels of apolipoprotein B, apolipoprotein A1, and the apolipoprotein B/A1 ratio between patients with distinct ischemic stroke subtypes. No significant differences were found in serum levels of apolipoprotein B, A1 and the apolipoprotein B/A1 ratio between patients with moderate-severe intracranial atherosclerotic disease and moderate-severe extracranial atherosclerotic disease. DISCUSSION Serum levels of apolipoprotein B and A1 did not differ between ischemic stroke subtypes. Additional studies are needed to validate our findings and to better understand the relationship between serum apolipoproteins and stroke.
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8
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Xiao L, Chu W, Wang H. Color-coded duplex sonography vs. 3.0 Tesla magnetic resonance angiography for detection of intracranial stenosis of the internal carotid artery: A prospective cohort study. Exp Ther Med 2019; 19:473-480. [PMID: 31885696 PMCID: PMC6913323 DOI: 10.3892/etm.2019.8255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 09/26/2019] [Indexed: 11/29/2022] Open
Abstract
Hemodynamic changes may provide important information for clinical decision-making in internal carotid artery (ICA) stenosis. The degree of stenosis is responsible for the hemodynamic changes. For detection of intracranial stenosis, each diagnostic method has its own advantages and disadvantages. The goal of the present study was to compare the sensitivity and accuracy of color-coded duplex sonography with that of magnetic resonance angiography (MRA) for the detection of intracranial stenosis. Patients with 3 vessels and/or left stem coronary artery disease were subjected to transcranial and extracranial color-coded duplex sonography (n=998), MRA (n=998) and invasive catheter angiography (n=939). The degree of stenosis was defined according to the Warfarin-Aspirin Symptomatic Intracranial Disease methodology. A ≥50% reduction in artery diameter was considered as a positive obstructive lesion. The benefits of each imaging method were assessed by clinical decision-making analysis. Color-coded duplex sonography and MRA, had sensitivities of 0.935 and 0.957 and accuracies of 0.92 and 0.974, respectively, when using invasive catheter angiography as a gold standard. The number of false-positive obstructive lesions detected by MRA was significantly higher than that for color-coded duplex sonography (53 vs. 13, P<0.0001). Color-coded duplex sonography was able to detect an obstructive lesion in one single image for ICAs with ≥57% stenosis, while MRA was only capable of detecting an obstructive lesion in one single image for ICAs with ≥80% stenosis. In conclusion, color-coded duplex sonography is a reliable method for the detection of intracranial stenosis in patients with coronary artery disease.
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Affiliation(s)
- Lu Xiao
- Department of Ultrasound, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, Henan 471000, P.R. China
| | - Wen Chu
- Department of Ultrasound, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, Henan 471000, P.R. China
| | - Hua Wang
- Department of Ultrasound, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, Henan 471000, P.R. China
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9
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van den Wijngaard IR, Holswilder G, van Walderveen MAA, Algra A, Wermer MJH, Zaidat OO, Boiten J. Treatment and imaging of intracranial atherosclerotic stenosis: current perspectives and future directions. Brain Behav 2016; 6:e00536. [PMID: 27843693 PMCID: PMC5102638 DOI: 10.1002/brb3.536] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 05/08/2016] [Accepted: 06/08/2016] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND PURPOSE Intracranial atherosclerosis is a common cause of stroke worldwide. It results in ischemic stroke due to different mechanisms including artery-to-artery embolism, in situ thrombo-occlusion, occlusion of perforating arteries, and hemodynamic failure. In this review, we present an overview of current treatment and imaging modalities in intracranial atherosclerotic stenosis. METHODS PubMed was searched for relevant articles in English that evaluated the treatment and imaging of intracranial atherosclerotic stenosis (ICAS). RESULTS Aggressive medical management, consisting of dual antiplatelet therapy and intensive risk factor management, is important in patients with ICAS because of a substantial risk of recurrent stroke, approximately 20% in the first year, in patients on aspirin or warfarin alone. Recent trials have suggested that, aggressive medical therapy results in better outcome as compared with intracranial stenting. However, the question remains what the optimal treatment strategy would be in patients with recurrent strokes in the setting of failed aggressive medical therapy. Moreover, controversy exists whether a subgroup of patients with symptomatic ICAS could benefit from intracranial stenting if selection is based on radiological evidence of hemodynamic failure. With regard to imaging, transcranial Doppler ultrasound and magnetic resonance angiography are useful screening tests for exclusion of ICAS, but need confirmation by other imaging modalities when stenosis is suggested. Computed tomography angiography has a high positive and negative predictive value for detection of intracranial luminal stenosis of 50% or higher, but performs worse than digital subtraction angiography with regard to establishing the exact degree of luminal stenosis. Novel imaging techniques including high-resolution CT and MRI better identify plaque characteristics than conventional imaging methods. CONCLUSIONS Currently, aggressive medical management remains the standard of care for patients with ICAS. Further research is needed to identify high-risk subgroups and to develop more effective treatments for ICAS patients.
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Affiliation(s)
- Ido R. van den Wijngaard
- Department of RadiologyLeiden University Medical CenterLeidenthe Netherlands
- Department of NeurologyMedical Center Haaglandenthe Haguethe Netherlands
| | | | | | - Ale Algra
- Department of Clinical EpidemiologyLeiden University Medical CenterLeidenthe Netherlands
- Department of Neurology and NeurosurgeryBrain Center Rudolf MagnusUniversity Medical Center UtrechtUtrechtthe Netherlands
| | | | - Osama O. Zaidat
- Department of NeurologyMedical College of Wisconsin/Froedtert HospitalMilwaukeeWIUSA
| | - Jelis Boiten
- Department of NeurologyMedical Center Haaglandenthe Haguethe Netherlands
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10
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Jia B, Scalzo F, Agbayani E, Woolf GW, Liu L, Miao Z, Liebeskind DS. Multimodal CT techniques for cerebrovascular and hemodynamic evaluation of ischemic stroke: occlusion, collaterals, and perfusion. Expert Rev Neurother 2016; 16:515-25. [PMID: 26967556 DOI: 10.1586/14737175.2016.1165094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Neuroimaging of cerebrovascular status and hemodynamics has vastly improved our understanding of stroke mechanisms and provided information for therapeutic decision-making. CT techniques are the most commonly used techniques due to wide availability, rapid acquisition and acceptable tolerance. Numerous multimodal CT techniques have been developed in the last few years. We summarize and explain the various multimodal CT acquisition techniques within three categories based on the scanning mode, namely static mode (single-phase CTA), multiple static mode (multi-phase CTA) and continuous mode (CT perfusion and dynamic CTA). Post-processing methods based on different acquisition modes are also introduced in an easy manner by focusing on the information extracted and products generated. We also describe the applications for these techniques along with their advantages and disadvantages.
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Affiliation(s)
- Baixue Jia
- a Department of Neuroradiology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China.,b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China
| | - Fabien Scalzo
- e Neurovascular Imaging Research Core , UCLA Stroke Center, University of California , Los Angeles , CA
| | - Elijah Agbayani
- f Henry Samueli School of Engineering and Applied Science , Computer Science Department, University of California , Los Angeles , CA , USA
| | - Graham W Woolf
- e Neurovascular Imaging Research Core , UCLA Stroke Center, University of California , Los Angeles , CA
| | - Liping Liu
- b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China.,g Department of Neurology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China
| | - Zhongrong Miao
- a Department of Neuroradiology , Beijing Tiantan Hospital, Capital Medical University , Beijing , China.,b China National Clinical Research Center for Neurological Diseases , Beijing , China.,c Center of Stroke , Beijing Institute for Brain Disorders , Beijing , China.,d Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease , Beijing , China
| | - David S Liebeskind
- h Department of Neurology , Stroke Center, University of California , Los Angeles , CA , USA
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11
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Nam HS, Scalzo F, Leng X, Ip HL, Lee HS, Fan F, Chen X, Soo Y, Miao Z, Liu L, Feldmann E, Leung T, Wong KS, Liebeskind DS. Hemodynamic Impact of Systolic Blood Pressure and Hematocrit Calculated by Computational Fluid Dynamics in Patients with Intracranial Atherosclerosis. J Neuroimaging 2015; 26:331-8. [PMID: 26598796 DOI: 10.1111/jon.12314] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Accepted: 10/09/2015] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE Success in clinical trials of intracranial atherosclerosis (ICAS) is related to accurate identification of high-risk patients. Noninvasive computational fluid dynamics (CFD) of stenotic lesions may enhance therapeutic decision-making. We determined whether physiologic parameters change downstream cerebral hemodynamics in patients with ICAS. METHODS Consecutive ICAS patients who underwent both CT angiography (CTA) and digital subtraction angiography were enrolled. CFD models were made using CTA source images. Inlet boundary conditions were defined using three ranges of systolic blood pressure (BP) (109.2, 158, and 225 mmHg) and hematocrit (27.3, 40.2, and 48.8). Ratios of pressure, shear strain rates (SSR), and flow velocity across the lesion were calculated using CFD simulations. A linear mixed model was used for the statistical analysis of repeated simulations. RESULTS Among the 56 patients, 32 had moderate stenosis (50-69%) and 24 had severe stenosis (70-99%). A linear mixed model revealed that the ratio of pressure was predicted by systolic BP and stenosis group interaction (P = .036). These pressure decreases were associated with systolic BP (P < .001) and stenosis group (P < .001), but not with hematocrit (P = .337). Post-hoc analysis revealed that pressure decreases were more profound in the severe stenosis than the moderate stenosis group when comparing high and low systolic BP (P = .0108). Ratios of SSR and velocity were only associated in the stenosis group. CONCLUSIONS Our study showed that systolic BP along with the degree of stenosis was associated with pressure decreases across stenotic lesions. Physiologic conditions may superimpose further changes in post-stenotic or downstream blood flow.
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Affiliation(s)
- Hyo Suk Nam
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Fabien Scalzo
- Neurovascular Imaging Research Core, University of California, Los Angeles, CA
| | - Xinyi Leng
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Hing Lung Ip
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Hye Sun Lee
- Department of Biostatistics, Yonsei University College of Medicine, Seoul, Korea
| | - Florence Fan
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Xiangyan Chen
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Yannie Soo
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Zhongrong Miao
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Liping Liu
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | | | - Thomas Leung
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ka Sing Wong
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong SAR, China
| | - David S Liebeskind
- Neurovascular Imaging Research Core, University of California, Los Angeles, CA
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