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Gilardone G, Viganò M, Cassinelli D, Fumagalli FM, Calvo I, Gilardone M, Sozzi M, Corbo M. [Formula: see text] Post-stroke acquired childhood aphasia. A scoping review. Child Neuropsychol 2023; 29:1268-1293. [PMID: 36548197 DOI: 10.1080/09297049.2022.2156992] [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: 03/03/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022]
Abstract
Aphasia has a great impact on children's lives, with stroke being its most common and studied etiology. However, our knowledge about this disorder is limited, the studies on this topic are sparse, and a consensus regarding its definition is lacking. In particular, the interpretation of this condition varied over time: from the rigid description of the so-called "standard doctrine" to the adoption of adult models for post-stroke aphasia. Therefore, this review provides a critical overview of childhood aphasia after stroke, focusing on its epidemiology, definition, diagnosis, and clinical manifestation. The scoping review approach was adopted, following PRISMA-ScR guidelines. PubMed, Web of Science, and PsycInfo databases were searched for related peer-review papers in English. Forty-six records were identified; the majority were single cases and case series, only a few were reviews and observational studies. Epidemiologic data are scarce; a few studies report that aphasia affects about one-third of children post-stroke. Despite terminological differences, there is an overall agreement on the definition of post-stroke aphasia in children as a language disorder acquired after the age of two. Approaches for the diagnosis and evaluation vary widely, including both assessments for developmental language disorders and tests for aphasia in adults. The clinical manifestations described in children are numerous and varied, similar to those found in adults, in contrast with the "standard doctrine." This review highlights the need for further studies to improve the knowledge of this condition, develop validated and specific assessment tools, and standardize clinical management.
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Affiliation(s)
- Giulia Gilardone
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
| | - Mauro Viganò
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
- UMR 7023 Structures Formelles du Langage, CNRS & Université de Paris 8, Paris, France
| | - Dario Cassinelli
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
| | | | - Irene Calvo
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
| | - Marco Gilardone
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
| | - Matteo Sozzi
- Neurology Unit, Neuroscience Department ASST "A. Manzoni", Lecco, Italy
| | - Massimo Corbo
- Department of Neurorehabilitation Sciences, Casa di Cura del Policlinico, Milan, Italy
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Hahn Arkenberg RE, Brown B, Mitchell S, Craig BΑ, Goffman L, Malandraki GA. Shared and Separate Neuromuscular Underpinnings of Swallowing and Motor Speech Development in the School-Age Years. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2023; 66:3260-3275. [PMID: 37549377 PMCID: PMC10558144 DOI: 10.1044/2023_jslhr-23-00059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/17/2023] [Accepted: 05/04/2023] [Indexed: 08/09/2023]
Abstract
PURPOSE Despite co-occurrence of swallowing and speech disorders in childhood, there is limited research on shared and separate neuromuscular underpinnings of these functions. The purpose of this study was to (a) compare neuromuscular control of swallowing and speech between younger and older children and (b) determine similarities and differences in neuromuscular control of swallowing and speech. METHOD Twenty-six typically developing children (thirteen 7- to 8-year-olds and thirteen 11- to 12-year-olds) completed this cross-sectional study. Neuromuscular control was evaluated using surface electromyography of submental muscles and superior and inferior orbicularis oris muscles during parallel tasks of swallowing and speech. Outcome measures included normalized mean amplitude, burst duration, time to peak amplitude, and bilateral synchrony, which were examined using mixed-effects models. RESULTS For normalized mean amplitude, burst duration, and time to peak amplitude, there were significant two- and three-way interactions between muscle group, task, and age group, indicating that older and younger children demonstrated different muscle activation patterns, and these patterns varied by muscle and task. No differences were noted between groups for bilateral synchrony. For parallel tasks, children demonstrated different magnitudes of normalized mean amplitude and time to peak amplitude of speech and swallowing. However, they demonstrated a similar pattern: increases in magnitude as task complexity increased. CONCLUSIONS Children continue to demonstrate refinement of their neuromuscular control of swallowing and speech between 7-8 and 11-12 years of age, and there are both shared and separate elements of neuromuscular control between these two vital functions. To improve generalizability of findings, future research should include longitudinal analysis of swallowing and speech development, as well as measures of central neurophysiology. SUPPLEMENTAL MATERIAL https://doi.org/10.23641/asha.23796258.
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Affiliation(s)
| | - Barbara Brown
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN
| | - Samantha Mitchell
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN
| | - Bruce Α. Craig
- Department of Statistics, Purdue University, West Lafayette, IN
| | - Lisa Goffman
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson
| | - Georgia A. Malandraki
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN
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Panova M, Pacheva I, Gaberova K, Iordanova R, Sotkova I, Galabova F, Tartova D, Dimitrova-Popova D, Ivanov I. Cases of acute hemiparesis in childhood. Folia Med (Plovdiv) 2023; 65:420-426. [PMID: 38351818 DOI: 10.3897/folmed.65.e81368] [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: 01/28/2022] [Accepted: 09/15/2022] [Indexed: 02/16/2024] Open
Abstract
INTRODUCTION Acute hemiparesis is an emergency of various etiologies and possible fatal outcome.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Ivan Ivanov
- Medical University of Plovdiv, Plovdiv, Bulgaria
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4
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Felling RJ, Jordan LC, Mrakotsky C, deVeber G, Peterson RK, Mineyko A, Feldman SJ, Shapiro K, Lo W, Beslow LA. Roadmap for the Assessment and Management of Outcomes in Pediatric Stroke. Pediatr Neurol 2023; 141:93-100. [PMID: 36805967 DOI: 10.1016/j.pediatrneurol.2023.01.008] [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: 11/20/2022] [Revised: 01/04/2023] [Accepted: 01/16/2023] [Indexed: 01/22/2023]
Abstract
Neurological morbidity is common after pediatric stroke, with moderate to severe deficits that can significantly impact education and social function. Care and recovery occur in phases distinguished by the time interval after stroke onset. These phases include the hyperacute and acute periods in which the focus is on cerebral reperfusion and prevention of neurological deterioration, followed by the subacute and chronic phases in which the focus is on secondary stroke prevention and mitigation of disability through rehabilitation, adaptation, and reintegration into the community. In this article, a multidisciplinary group of pediatric stroke experts review the stages of recovery after pediatric stroke with an emphasis on critical assessment time points. Our goal is to encourage increased standardization of outcome assessment to facilitate future clinical trials comparing various treatment and intervention options and advance optimized care for children with stroke.
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Affiliation(s)
- Ryan J Felling
- Departments of Neurology and Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland.
| | - Lori C Jordan
- Division of Pediatric Neurology, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Christine Mrakotsky
- Departments of Psychiatry & Neurology, Center for Neuropsychology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Gabrielle deVeber
- Child Health Evaluative Sciences Program, Hospital for Sick Children Research Institute, Toronto, Ontario, Canada
| | - Rachel K Peterson
- Neuropsychology Department, Kennedy Krieger Institute, Baltimore, Maryland; Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, Maryland
| | - Aleksandra Mineyko
- Section of Neurology, Department of Pediatrics, University of Calgary, Alberta, Canada
| | - Samantha J Feldman
- Neurosciences and Mental Health Research Program, Hospital for Sick Children Research Institute, Toronto, Ontario, Canada
| | - Kevin Shapiro
- Cortica Healthcare, Westlake Village, California; Division of Neurology, Children's Hospital Lost Angeles, Los Angeles, California
| | - Warren Lo
- Departments of Pediatrics and Neurology, The Ohio State University Nationwide Children's Hospital, Columbus, Ohio
| | - Lauren A Beslow
- Division of Neurology, Children's Hospital of Philadelphia, Departments of Neurology and Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
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Rivella C, Zanetti A, Bertamino M, Severino M, Primavera L, Signa S, Moretti P, Viterbori P. [Formula: see text] Executive functions and psychosocial impairment in children following arterial ischemic stroke. Child Neuropsychol 2023; 29:276-298. [PMID: 35668031 DOI: 10.1080/09297049.2022.2083093] [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: 01/11/2023]
Abstract
This study examined the executive function (EF) of children with a history of arterial ischemic stroke (AIS) and preserved intellectual abilities, with reference to age at stroke onset, lesion characteristics, language, and motor functioning. In addition, the associations between EF and emotional and behavioral functioning were investigated. A battery of standardized neuropsychological tests was administered to children with previous AIS aged 7-12 in order to assess EF, including inhibition, working memory, cognitive flexibility, and attention. Parents rated questionnaires regarding real-life emotional and behavioral functioning. Finally, clinical and neuroradiological data were also gathered. Thirty patients were enrolled. Eight children fall in the lower end of the normative range or below in more than half of the EF measures, with working memory, inhibition and cognitive flexibility equally impaired, and attention relatively better preserved. Larger lesion size and language deficits were significantly associated with higher EF impairment. Emotional and behavioral functioning was lower in children with weaker EF. Children with a history of AIS, even those with preserved intellectual functioning, have a high risk of showing poor EF, mostly regardless of clinical features or functional impairment. EF difficulties are in turn associated with emotional and behavioral problems. Therefore, a standardized evaluation of EF in this population is mandatory as part of the follow-up, in order to ensure an early intervention and prevent related difficulties.
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Affiliation(s)
- Carlotta Rivella
- Department of Educational Science, University of Genoa, Genoa, Italy
| | - Alice Zanetti
- Physical Medicine and Rehabilitation Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Marta Bertamino
- Physical Medicine and Rehabilitation Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | | | - Ludovica Primavera
- Physical Medicine and Rehabilitation Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Sara Signa
- Department of Neuroscience, Ophthalmology, Genetics and Maternal Infantile Sciences (DINOGMI), University of Genoa, Genoa, Italy.,Autoinflammatory Diseases and Immunodeficiencies Center, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Paolo Moretti
- Physical Medicine and Rehabilitation Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Paola Viterbori
- Department of Educational Science, University of Genoa, Genoa, Italy
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He Y, Ying J, Tang J, Zhou R, Qu H, Qu Y, Mu D. Neonatal Arterial Ischaemic Stroke: Advances in Pathologic Neural Death, Diagnosis, Treatment, and Prognosis. Curr Neuropharmacol 2022; 20:2248-2266. [PMID: 35193484 PMCID: PMC9890291 DOI: 10.2174/1570159x20666220222144744] [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: 11/29/2021] [Revised: 02/04/2022] [Accepted: 02/18/2022] [Indexed: 12/29/2022] Open
Abstract
Neonatal arterial ischaemic stroke (NAIS) is caused by focal arterial occlusion and often leads to severe neurological sequelae. Neural deaths after NAIS mainly include necrosis, apoptosis, necroptosis, autophagy, ferroptosis, and pyroptosis. These neural deaths are mainly caused by upstream stimulations, including excitotoxicity, oxidative stress, inflammation, and death receptor pathways. The current clinical approaches to managing NAIS mainly focus on supportive treatments, including seizure control and anticoagulation. In recent years, research on the pathology, early diagnosis, and potential therapeutic targets of NAIS has progressed. In this review, we summarise the latest progress of research on the pathology, diagnosis, treatment, and prognosis of NAIS and highlight newly potential diagnostic and treatment approaches.
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Affiliation(s)
- Yang He
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
| | - Junjie Ying
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
| | - Jun Tang
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
| | - Ruixi Zhou
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
| | - Haibo Qu
- Department of Radiology, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Yi Qu
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
| | - Dezhi Mu
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China
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Umay E, Eyigor S, Giray E, Karadag Saygi E, Karadag B, Durmus Kocaaslan N, Yuksel D, Demir AM, Tutar E, Tikiz C, Gurcay E, Unlu Z, Celik P, Unlu Akyuz E, Mengu G, Bengisu S, Alicura S, Unver N, Yekteusaklari N, Uz C, Cikili Uytun M, Bagcier F, Tarihci E, Akaltun MS, Ayranci Sucakli I, Cankurtaran D, Aykın Z, Aydın R, Nazli F. Pediatric dysphagia overview: best practice recommendation study by multidisciplinary experts. World J Pediatr 2022; 18:715-724. [PMID: 35821340 DOI: 10.1007/s12519-022-00584-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 06/19/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Currently, there is no comprehensive and multidisciplinary recommendation study covering all aspects of pediatric dysphagia (PD). This study aimed to generate PD management recommendations with methods that can be used in clinical practice to fill this gap in our country and in the world, from the perspective of experienced multidisciplinary experts. METHODS This recommendation paper was generated by a multidisciplinary team, using the seven-step process and a three-round modified Delphi survey via e-mail. First, ten open-ended questions were created, and then detailed recommendations including management, diagnosis, treatment, and follow-up were created with the answers from these questions. Each recommendation item was voted on by the experts as overall consensus (strong recommendation), approaching consensus (weak recommendation) and divergent consensus (not recommended). RESULTS In the 1st Delphi round, a questionnaire of 414 items was prepared based on the experts' responses to ten open-ended questions. In the 2nd Delphi round, 59.2% of these items were accepted as pre-recommendation. In the 3rd Delphi round, 62.6% of 246 items were accepted for inclusion in the proposals. The final version recommendations consisted of 154 items. CONCLUSIONS This study includes comprehensive and detailed answers for every problem that could be posed in clinical practice for the management of PD, and recommendations are for all pediatric patients with both oropharyngeal and esophageal dysphagia.
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Affiliation(s)
- Ebru Umay
- Department of Physical Medicine and Rehabilitation Ankara, University of Health Sciences Turkey, Ankara Diskapi Yildirim Beyazit Training and Research Hospital, Istanbul, Turkey.
| | - Sibel Eyigor
- Department of Physical Medicine and Rehabilitation, Ege University, Izmir, Turkey
| | - Esra Giray
- Department of Physical Medicine and Rehabilitation, Fatih Sultan Mehmet Training and Research Hospıtal, Istanbul, Turkey
| | - Evrim Karadag Saygi
- Department of Physical Medicine and Rehabilitation, Marmara University, Istanbul, Turkey
| | - Bulent Karadag
- Department of Pediatric Pulmonology, Marmara University, Istanbul, Turkey
| | - Nihal Durmus Kocaaslan
- Department of Plastic, Reconstructive and Aesthetic Surgery, Marmara University, Istanbul, Turkey
| | - Deniz Yuksel
- Department of Pediatric Neurology, University of Health Sciences, Ankara Dr Sami Ulus Maternity, Children's Health and Diseases Training and Research Hospital, Ankara, Turkey
| | - Arzu Meltem Demir
- Department of Pediatric Gastroenterology, Ankara City Hospital, Ankara, Turkey
| | - Engin Tutar
- Department of Pediatric Gastroenterology, Marmara University, Ankara, Turkey
| | - Canan Tikiz
- Department of Physical Medicine and Rehabilitation, Celal Bayar University, Manisa, Turkey
| | - Eda Gurcay
- University of Health Sciences Turkey, Gaziler Physical Medicine and Rehabilitation Training and Research Hospital, Ankara, Turkey
| | - Zeliha Unlu
- Department of Physical Medicine and Rehabilitation, Celal Bayar University, Manisa, Turkey
| | - Pelin Celik
- Department of Developmental Pediatric, Ankara City Hospital, Ankara, Turkey
| | - Ece Unlu Akyuz
- Department of Physical Medicine and Rehabilitation Ankara, University of Health Sciences Turkey, Ankara Diskapi Yildirim Beyazit Training and Research Hospital, Istanbul, Turkey
| | - Guven Mengu
- Department of Western Languages and Literatures, Ankara Haci Bayram Veli University, English Language and Literature Division, Ankara, Turkey
| | - Serkan Bengisu
- Department of Speech and Language Therapy, Uskudar University, Istanbul, Turkey
| | - Sibel Alicura
- Department of Otolaryngology, Head and Neck Surgery, University of Health Sciences, Ankara Diskapi Yildirim Beyazit Training and Research Hospital, Ankara, Turkey
| | - Necati Unver
- Department of Otolaryngology, Head and Neck Surgery, Marmara University, Istanbul, Turkey
| | - Nida Yekteusaklari
- Department of Physical Medicine and Rehabilitation, Marmara University, Istanbul, Turkey
| | - Cuma Uz
- Department of Physical Medicine and Rehabilitation Ankara, University of Health Sciences Turkey, Ankara Diskapi Yildirim Beyazit Training and Research Hospital, Istanbul, Turkey
| | - Merve Cikili Uytun
- Department of Child and Adolescent Psychiatry, Ankara University, Ankara, Turkey
| | - Fatih Bagcier
- Department of Physical Medicine and Rehabilitation, Istanbul Basaksehir Cam and Sakura City Hospital, Istanbul, Turkey
| | - Elif Tarihci
- Department of Physical Medicine and Rehabilitation, Istanbul University, Istanbul, Turkey
| | - Mazlum Serdar Akaltun
- Department of Physical Medicine and Rehabilitation, Gaziantep University, Gaziantep, Turkey
| | - Iclal Ayranci Sucakli
- University of Health Sciences Turkey, Gaziler Physical Medicine and Rehabilitation Training and Research Hospital, Ankara, Turkey
| | - Damla Cankurtaran
- Department of Physical Medicine and Rehabilitation Ankara, University of Health Sciences Turkey, Ankara Diskapi Yildirim Beyazit Training and Research Hospital, Istanbul, Turkey
| | - Zeynep Aykın
- Ministry of Health, Mamak Public Hospital, Ankara, Turkey
| | - Resa Aydın
- Department of Physical Medicine and Rehabilitation, Istanbul University, Istanbul, Turkey
| | - Fatma Nazli
- Department of Physical Medicine and Rehabilitation, Kirikkale University, Kirikkale, Turkey
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Malandraki GA, Arkenberg RH. Advances in Swallowing Neurophysiology across Pediatric Development: Current Evidence and Insights. CURRENT PHYSICAL MEDICINE AND REHABILITATION REPORTS 2021; 9:267-276. [PMID: 34956736 DOI: 10.1007/s40141-021-00334-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Purpose of Review This review article analyzes current evidence on the neurophysiology of swallowing during development and offers expert opinion on clinical implications and future research directions. Recent Findings In the past five years, basic and clinical research has offered advances in our understanding of pediatric swallowing neurophysiology. Animal models have elucidated the role of brainstem circuits and the peripheral and central nervous system in neonatal swallowing. Recent human studies have further showcased that fetal and infant swallowing require cerebral inputs in order to develop functionally. Finally, neurophysiological and neuroimaging studies are starting to better define these cerebral inputs, as well as neuroplastic adaptations that may be needed for optimal feeding development. Summary The neural development of swallowing is a complex and dynamic process. Continued research is needed to better understand influences on swallowing neural development, which can be essential for improving prevention, diagnosis, and interventions for pediatric dysphagia.
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Affiliation(s)
- Georgia A Malandraki
- Purdue University, Speech, Language, & Hearing Sciences, West Lafayette, Indiana, United States of America
- Purdue University, Weldon School of Biomedical Engineering, West Lafayette, Indiana, United States of America
| | - Rachel Hahn Arkenberg
- Purdue University, Speech, Language, & Hearing Sciences, West Lafayette, Indiana, United States of America
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Jordan LC, Beslow LA. Hard to Swallow: Dysphagia and Feeding After Ischemic Stroke in Children and Neonates. Stroke 2021; 52:1319-1321. [PMID: 33641381 DOI: 10.1161/strokeaha.120.033524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lori C Jordan
- Division of Pediatric Neurology, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN (L.C.J.)
| | - Lauren A Beslow
- Division of Child Neurology, Departments of Neurology and Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania (L.A.B.)
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