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See AP, Smith ER. Management of Pediatric Intracranial Arteriovenous Malformations. J Korean Neurosurg Soc 2024; 67:289-298. [PMID: 38433517 PMCID: PMC11079567 DOI: 10.3340/jkns.2024.0027] [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: 01/23/2024] [Revised: 02/24/2024] [Accepted: 02/27/2024] [Indexed: 03/05/2024] Open
Abstract
Pediatric intracranial arteriovenous malformations (AVMs) are challenging lesions managed by pediatric neurosurgeons. The high risk of hemorrhage and neurologic injury is compounded by the unique anatomy of each malformation that requires individualizing treatment options. This article reviews the current status of pediatric AVM epidemiology, pathophysiology and clinical care, with a specific focus on the rationale and methodology of surgical resection.
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Affiliation(s)
- Alfred Pokmeng See
- Department of Neurosurgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA
| | - Edward R. Smith
- Department of Neurosurgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA
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Harrar DB, Sun LR, Goss M, Pearl MS. Cerebral Digital Subtraction Angiography in Acute Intracranial Hemorrhage: Considerations in Critically Ill Children. J Child Neurol 2022; 37:693-701. [PMID: 35673704 DOI: 10.1177/08830738221106818] [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] [Indexed: 01/10/2023]
Abstract
Cerebrovascular disorders are an important cause of morbidity and mortality in children. Although minimally invasive, cerebral digital subtraction angiography (DSA) has been shown to be safe in children and is a valuable, and perhaps underutilized, technique for the diagnosis and management of pediatric cerebrovascular disorders in the critical care setting. Through a case-based approach, we explore the utility of DSA in critically ill children with acute intracranial hemorrhage (ICH). We discuss the use of DSA in the acute management of aneurysm and arteriovenous malformation rupture as well as cerebral vasospasm. Those caring for critically ill children with acute ICH should consider cerebral DSA as part of a comprehensive approach to the diagnosis and management of these conditions.
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Affiliation(s)
- D B Harrar
- Division of Neurology, 8404Children's National Hospital, George Washington University School of Medicine, Washington, DC, USA
| | - L R Sun
- Division of Neurology, Johns Hopkins Hospital, Baltimore, MD, USA
| | - M Goss
- Division of Neurology, 72462Dell Children's Hospital, Austin, TX, USA
| | - M S Pearl
- Department of Radiology, 8404Children's National Hospital, Washington, DC, USA
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Ciochon UM, Bindslev JBB, Hoei-Hansen CE, Truelsen TC, Larsen VA, Nielsen MB, Hansen AE. Causes and Risk Factors of Pediatric Spontaneous Intracranial Hemorrhage—A Systematic Review. Diagnostics (Basel) 2022; 12:diagnostics12061459. [PMID: 35741269 PMCID: PMC9221737 DOI: 10.3390/diagnostics12061459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 01/10/2023] Open
Abstract
Previous studies suggest that the most common cause of spontaneous intracerebral hemorrhage in children and adolescents is arteriovenous malformations (AVMs). However, an update containing recently published data on pediatric spontaneous intracranial hemorrhages is lacking. The aim of this study is to systematically analyze the published data on the etiologies and risk factors of pediatric spontaneous intracranial hemorrhage. This systematic review was performed in compliance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. A search in PubMed, Embase, Scopus, Web of Science and Cochrane Library was conducted aiming for articles published in year 2000 and later, containing data on etiology and risk factors of spontaneous intracranial hemorrhages in unselected cohorts of patients aged between 1 month and 18 years. As a result, forty studies were eligible for data extraction and final analysis. These included 7931 children and adolescents with 4009 reported etiologies and risk factors. A marked variety of reported etiologies and risk factors among studies was observed. Vascular etiologies were the most frequently reported cause of pediatric spontaneous intracranial hemorrhages (n = 1727, 43.08% of all identified etiologies or risk factors), with AVMs being the most common vascular cause (n = 1226, 70.99% of all vascular causes). Hematological and systemic causes, brain tumors, intracranial infections and cardiac causes were less commonly encountered risk factors and etiologies.
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Affiliation(s)
- Urszula Maria Ciochon
- Department of Diagnostic Radiology, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
- Correspondence:
| | - Julie Bolette Brix Bindslev
- Department of Pediatrics and Adolescent Medicine, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
| | - Christina Engel Hoei-Hansen
- Department of Pediatrics and Adolescent Medicine, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Thomas Clement Truelsen
- Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
- Department of Neurology, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
| | - Vibeke Andrée Larsen
- Department of Diagnostic Radiology, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
| | - Michael Bachmann Nielsen
- Department of Diagnostic Radiology, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Adam Espe Hansen
- Department of Diagnostic Radiology, Copenhagen University Hospital—Rigshospitalet, 2200 Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
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Abstract
Intracranial vascular abnormalities rarely are encountered in primary care. Many of the pathologies are occult and prognosis varies widely between inconsequential variants of anatomy to acutely life-threatening conditions. Consequently, there often is a great deal of anxiety associated with any potential diagnosis. This article reviews anatomic intracranial vascular lesions, including vascular malformations (arteriovenous malformations/arteriovenous fistulae and cavernous malformations), structural arteriopathies (aneurysms and moyamoya), and common developmental anomalies of the vasculature. The focus includes a general overview of anatomy, pathology, epidemiology, and key aspects of evaluation for the primary care provider and a review of common questions encountered in practice.
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Guerrero WR, Dandapat S, Ortega-Gutierrez S. Hemorrhagic Cerebrovascular Pathology in the Pediatric Population. Front Neurol 2020; 11:1055. [PMID: 33041990 PMCID: PMC7527474 DOI: 10.3389/fneur.2020.01055] [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: 06/12/2020] [Accepted: 08/11/2020] [Indexed: 01/10/2023] Open
Abstract
Hemorrhagic cerebrovascular disease in the pediatric population can have devastating and long-term effects. Progress in the fields of genetics, neuroimaging, pharmacology, and surgical techniques has led to improved diagnosis and management of pediatric cerebrovascular diseases. In this review we discuss the current etiologies and medical and surgical treatments of hemorrhagic cerebrovascular pathology affecting infants and children. A special emphasis is placed on neuroendovascular treatment options. Increased knowledge about this unique pathology and the medical and therapeutic options will empower practitioners to more quickly and accurately identify and accurately treat hemorrhagic diseases in the pediatric population.
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Affiliation(s)
- Waldo R Guerrero
- Department of Neurosurgery, University of South Florida Morsani College of Medicine, Tampa, FL, United States
| | - Sudeepta Dandapat
- Department of Neurology, Radiology, and Neurosurgery, University of Iowa Carver College of Medicine, Comprehensive Stroke Center, Iowa City, IA, United States
| | - Santiago Ortega-Gutierrez
- Department of Neurology, Radiology, and Neurosurgery, University of Iowa Carver College of Medicine, Comprehensive Stroke Center, Iowa City, IA, United States
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Huang X, Cheng Z, Xu Y, Xia L, Zhan Z, Xu T, Cao Y, Han Z. Associations of Clinical Characteristics and Etiology With Death in Hospitalized Chinese Children After Spontaneous Intracerebral Hemorrhage: A Single-Center, Retrospective Cohort Study. Front Pediatr 2020; 8:576077. [PMID: 33614538 PMCID: PMC7890113 DOI: 10.3389/fped.2020.576077] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 12/31/2020] [Indexed: 01/10/2023] Open
Abstract
Objective: We retrospectively analyzed clinical characteristics, etiology, and mortality risk factors in pediatric cases of non-traumatic spontaneous intracerebral hemorrhage. Methods: This study involved children between 29 days and 18 years old with confirmed spontaneous intracerebral hemorrhage based on head CT or MRI at the Second Affiliated Hospital of Wenzhou Medical University and Yuying Children's Hospital from January 2008 to March 2020. Demographic and clinical characteristics, etiology, imaging, and treatment data were collected at baseline. Potential risk factors of in-hospital death were identified using univariate analysis and multivariate logistic regression. Result: A total of 200 children (126 males, median age 5 years) were included in the study. Clinical symptoms of spontaneous intracerebral hemorrhage were typically non-specific (79.5%). One third of patients (31.1%) had a Glasgow Coma Scale score (GCS) ≤ 8, and nearly two-thirds (60.5%) showed a combination of ventricular hemorrhage or subarachnoid hemorrhage. Supratentorial hemorrhage was more common. Cerebrovascular disease (37.0%) and hematological disease (33.5%) were the most frequent etiologies of spontaneous intracerebral hemorrhage. Most patients (74.5%) received non-surgical treatment, while 25.5% received surgical treatment. After an average of 12 days of treatment, 167 children (83.5%) survived and 33 (16.5%) died. Multivariate logistic regression showed herniation syndrome, and low GCS (≤ 8) to be associated with increased risk of mortality, while hemorrhage due to arteriovenous malformation was associated with lower risk of mortality. Conclusion: Our data suggest that cerebrovascular disease is the most common cause of spontaneous intracerebral hemorrhage among children, and that arteriovenous malformation is associated with lower risk of death in hospital. Conversely, the presence of herniation syndrome, low GCS (≤ 8) increase risk of in-hospital mortality. Our results underscore the importance of timely imaging and supplementary examinations in cases of suspected spontaneous intracerebral hemorrhage.
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Affiliation(s)
- Xiaoyan Huang
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zicheng Cheng
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ye Xu
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Lingfan Xia
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhenxiang Zhan
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Tong Xu
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yungang Cao
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhao Han
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
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Boulouis G, Blauwblomme T, Hak JF, Benichi S, Kirton A, Meyer P, Chevignard M, Tournier-Lasserve E, Mackay MT, Chabrier S, Cordonnier C, Kossorotoff M, Naggara O. Nontraumatic Pediatric Intracerebral Hemorrhage. Stroke 2019; 50:3654-3661. [DOI: 10.1161/strokeaha.119.025783] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Gregoire Boulouis
- From the Pediatric Radiology Department, Necker Enfants Malades (NEM), INSERM UMR1266, Sainte-Anne (G.B., J.F.H., O.N.)
| | - Thomas Blauwblomme
- Pediatric Neurosurgery Department, Institut Imagine, INSERM UMR 1163, NEM (T.B., S.B.)
| | - Jean François Hak
- From the Pediatric Radiology Department, Necker Enfants Malades (NEM), INSERM UMR1266, Sainte-Anne (G.B., J.F.H., O.N.)
- Neuroimaging Department, CHRU La Timone, Marseille, France (J.F.H.)
| | - Sandro Benichi
- Pediatric Neurosurgery Department, Institut Imagine, INSERM UMR 1163, NEM (T.B., S.B.)
| | - Adam Kirton
- Departments of Pediatrics and Clinical Neurosciences, Cumming School of Medicine, University of Calgary, AB, Canada (A.K.)
- Pediatric Neuro ICU (A.K.)
| | | | - Mathilde Chevignard
- Rehabilitation Department for Children with Acquired Neurological Injury, Saint-Maurice Hospitals (M.C.)
| | - Elisabeth Tournier-Lasserve
- Genetics of Neurovascular disorders, AP-HP, Hôpital Lariboisière and Université de Paris, NeuroDiderot, Inserm, F-75010 (E.T.-L.)
| | - Mark T. Mackay
- Neurology Department, Royal Children’s Hospital Melbourne, Murdoch Children’s Research Institute, and Department of Paediatrics, University of Melbourne, Australia (M.T.M.)
| | - Stéphane Chabrier
- CHU Saint-Étienne, French Center for Pediatic Stroke, F-42055 Saint-Étienne, France (S.C.)
| | - Charlotte Cordonnier
- Université Lille, Inserm U1171, Degenerative and Vascular Cognitive Disorders, CHU Lille, Neurology Department, France (C.C.)
| | - Manoëlle Kossorotoff
- Department of Pediatric Neurology, French Center for Pediatic Stroke, NEM (M.K.)
| | - Olivier Naggara
- From the Pediatric Radiology Department, Necker Enfants Malades (NEM), INSERM UMR1266, Sainte-Anne (G.B., J.F.H., O.N.)
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Williams V, Jayashree M, Bansal A, Baranwal A, Nallasamy K, Singhi SC, Singhi P, Gupta SK. Spontaneous intracranial haemorrhage in children-intensive care needs and predictors of in-hospital mortality: a 10-year single-centre experience. Childs Nerv Syst 2019; 35:1371-1379. [PMID: 31165253 DOI: 10.1007/s00381-019-04209-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 05/15/2019] [Indexed: 01/10/2023]
Abstract
PURPOSE Spontaneous intracranial haemorrhage (SICH) in children, although uncommon, is associated with significant mortality and morbidity. Paediatric data is however limited. MATERIAL AND METHODS Case records of 105 children with SICH, > 1 month to 12 years, admitted to a tertiary level PICU of a teaching and referral hospital between January 2009 and May 2018 were analysed retrospectively. In-hospital mortality was the primary outcome. Variables between survivors and non-survivors were compared to determine predictors of mortality. RESULTS The median (IQR) age of subjects was 6 (2.25, 70) months. Common clinical features were altered sensorium (n = 87, 82.9%), seizures (n = 73, 69.5%), pallor (n = 66, 62.9%) and bulging anterior fontanelle (n = 52, 49.5%). Median (IQR) Glasgow Coma Scale (GCS) at admission was 10 (6, 13) with herniation noted in 27 (25.7%) children. Vitamin K deficiency bleeding (VKDB) and arteriovenous malformation (AVM) were the most common etiology for bleeding among infants and older children respectively. The most common site of bleeding was intracerebral (n = 47, 44.8%) followed by subdural (n = 26; 24.8%). Sixteen (15.2%) children died during hospital stay. On univariate analysis, GCS < 8, Pediatric Risk of Mortality score (PRISM III) > 20, need for intubation, thiopentone coma for refractory intracranial pressure (ICP) and progression to shock and acute kidney injury (AKI) predicted mortality. Seizures were favourably associated with survival. Age, site of bleeding, etiology or type of management for raised ICP (conservative versus decompressive craniectomy) did not affect the outcome. On multivariable analysis, progression to AKI (OR 5.86; 95% CI, 1.53-22.4; p 0.01) predicted poor outcome. Seizures, however, were associated with better odds for survival (OR 0.12; 95% CI, 0.03-0.47; p 0.002). CONCLUSIONS VKDB and AVM were the common etiologies among infants and older children respectively. Age, site, etiology of bleeding and type of management did not affect outcome. Severe decompensation at presentation, thiopentone for refractory ICP and progression to multiorgan dysfunction determined mortality.
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Affiliation(s)
- Vijai Williams
- Division of Pediatric Critical Care, Department of Pediatrics, Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Muralidharan Jayashree
- Division of Pediatric Critical Care, Department of Pediatrics, Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.
| | - Arun Bansal
- Division of Pediatric Critical Care, Department of Pediatrics, Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Arun Baranwal
- Division of Pediatric Critical Care, Department of Pediatrics, Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Karthi Nallasamy
- Division of Pediatric Critical Care, Department of Pediatrics, Advanced Pediatrics Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | | | - Pratibha Singhi
- Department of Pediatrics, Medanta The Medicity, Gurgaon, India
| | - S K Gupta
- Department of Neurosurgery, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
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Lopez-Espejo M, Hernandez-Chavez M, Huete I. Risk factors for in-hospital and follow-up mortality after childhood arterial ischemic stroke. J Neurol 2019; 266:1526-1532. [DOI: 10.1007/s00415-019-09293-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2018] [Revised: 03/19/2019] [Accepted: 03/21/2019] [Indexed: 01/10/2023]
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Management of Stroke in Neonates and Children: A Scientific Statement From the American Heart Association/American Stroke Association. Stroke 2019; 50:e51-e96. [DOI: 10.1161/str.0000000000000183] [Citation(s) in RCA: 240] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Beslow LA, Dowling MM, Hassanein SMA, Lynch JK, Zafeiriou D, Sun LR, Kopyta I, Titomanlio L, Kolk A, Chan A, Biller J, Grabowski EF, Abdalla AA, Mackay MT, deVeber G. Mortality After Pediatric Arterial Ischemic Stroke. Pediatrics 2018; 141:peds.2017-4146. [PMID: 29695585 DOI: 10.1542/peds.2017-4146] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/14/2018] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVES Cerebrovascular disease is among the top 10 causes of death in US children, but risk factors for mortality are poorly understood. Within an international registry, we identify predictors of in-hospital mortality after pediatric arterial ischemic stroke (AIS). METHODS Neonates (0-28 days) and children (29 days-<19 years) with AIS were enrolled from January 2003 to July 2014 in a multinational stroke registry. Death during hospitalization and cause of death were ascertained from medical records. Logistic regression was used to analyze associations between risk factors and in-hospital mortality. RESULTS Fourteen of 915 neonates (1.5%) and 70 of 2273 children (3.1%) died during hospitalization. Of 48 cases with reported causes of death, 31 (64.6%) were stroke-related, with remaining deaths attributed to medical disease. In multivariable analysis, congenital heart disease (odds ratio [OR]: 3.88; 95% confidence interval [CI]: 1.23-12.29; P = .021), posterior plus anterior circulation stroke (OR: 5.36; 95% CI: 1.70-16.85; P = .004), and stroke presentation without seizures (OR: 3.95; 95% CI: 1.26-12.37; P = .019) were associated with in-hospital mortality for neonates. Hispanic ethnicity (OR: 3.12; 95% CI: 1.56-6.24; P = .001), congenital heart disease (OR: 3.14; 95% CI: 1.75-5.61; P < .001), and posterior plus anterior circulation stroke (OR: 2.71; 95% CI: 1.40-5.25; P = .003) were associated with in-hospital mortality for children. CONCLUSIONS In-hospital mortality occurred in 2.6% of pediatric AIS cases. Most deaths were attributable to stroke. Risk factors for in-hospital mortality included congenital heart disease and posterior plus anterior circulation stroke. Presentation without seizures and Hispanic ethnicity were also associated with mortality for neonates and children, respectively. Awareness and study of risk factors for mortality represent opportunities to increase survival.
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Affiliation(s)
- Lauren A Beslow
- Division of Neurology, Children's Hospital of Philadelphia, and Departments of Neurology and Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
| | - Michael M Dowling
- Departments of Pediatrics and Neurology, University of Texas Southwestern Medical Center, Dallas, Texas
| | | | - John K Lynch
- Section on Stroke Diagnostics and Therapeutics, National Institute of Neurologic Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
| | - Dimitrios Zafeiriou
- Division of Child Neurology and Developmental Pediatrics, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Lisa R Sun
- Department of Neurology, Johns Hopkins School of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Ilona Kopyta
- Department of Pediatric Neurology, School of Medicine, Medical University of Silesia, Katowice, Poland
| | - Luigi Titomanlio
- Pediatric Emergency Département, Hôpital Robert Debré, Paris, France
| | - Anneli Kolk
- Department of Neuropsychology, University of Tartu, Tartu, Estonia
| | - Anthony Chan
- Department of Pediatrics, McMaster Children's Hospital, McMaster University, Hamilton, Canada
| | - Jose Biller
- Department of Neurology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois
| | - Eric F Grabowski
- Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts
| | - Abdalla A Abdalla
- Department of Neurosciences, Al Jalila Children's Hospital, Dubai, United Arab Emirates
| | - Mark T Mackay
- Department of Neurology, The Royal Children's Hospital, Melbourne, Australia; and
| | - Gabrielle deVeber
- Division of Neurology, Department of Pediatrics, Hospital for Sick Children, University of Toronto, Toronto, Canada
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