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CE Workshop 03: Stroke in the Developing Brain: Mechanisms, Outcomes, and Intervention
- Robyn Westmacott
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- Journal:
- Journal of the International Neuropsychological Society / Volume 29 / Issue s1 / November 2023
- Published online by Cambridge University Press:
- 21 December 2023, p. 2
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Over the past 10-15 years, significant progress has been made in the diagnosis and treatment of pediatrics stroke. Accordingly, the focus of much research has turned to understanding factors that determine neurological and neuropsychological outcomes in this population. This Continuing Education (CE) course will start by defining key terms in the field of pediatric stroke and reviewing current understanding of epidemiology, pathophysiology, diagnosis, and medical treatment. Next, we will review recent neuropsychological literature on cognitive outcomes following pediatric stroke, highlighting the vulnerability of the developing brain, the long-term deficits that often result from early disruption of brain function and subsequent brain development, and the significant variability in outcomes seen across individuals. Heterogeneity in outcomes has been linked to a range of clinical and demographic factors, including those related to the brain (e.g., stroke type, lesion location and size, adaptive and maladaptive patterns of reorganization), the child (e.g., age at stroke, age at assessment, comorbid neurological conditions) and the environment (family stress, parent mental health, educational support). Multi-disciplinary approaches to intervention will also be discussed. Finally, directions for future research will also be outlined, as we are just starting to understand how these factors interact to impact neurocognitive outcome and resiliency following pediatric stroke.
Upon conclusion of this course, learners will be able to:
1. Describe the epidemiology, pathophysiology, and neurological outcomes associated with stroke in infants and children
2. Illustrate the variability in neuropsychological outcomes after pediatric stroke and highlight important determining factors of these outcomes
3. Apply current research into outcomes and treatments to neuropsychological practice
2 Associations Between Motor Functioning and Intellectual Abilities in Pediatric Arterial Ischemic Stroke
- Justine Ledochowski, Mahmoud Slim, Mary Desrocher, Robyn Westmacott, Nomazulu Dlamini
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- Journal:
- Journal of the International Neuropsychological Society / Volume 29 / Issue s1 / November 2023
- Published online by Cambridge University Press:
- 21 December 2023, pp. 94-95
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Objective:
Motor impairments are one of the most common adverse outcomes after pediatric arterial ischemic stroke (AIS), affecting approximately half of survivors. The development of motor and cognitive skills is closely interrelated, and they share common neural substrates. The objective of this study was to examine whether motor functioning after the acute phase of stroke is associated with school-age intellectual abilities. We also examined associations between concurrent motor functioning and intellectual abilities. Finally, we explored clinical features associated with motor impairments.
Participants and Methods:Participants were 64 children, 34 childhood AIS (Meanage= 11.90[2.38]); 30 perinatal AIS (Meanage= 8.75[2.22]), from the Children’s Stroke Program at SickKids Hospital. Motor functioning was assessed with the Pediatric Stroke Outcome Measure sensorimotor subscale at two timepoints, Time 1 or early recovery (childhood group between 30 days post-stroke to 1 year; perinatal group between 2-5 years of age) and Time 2, closest to neuropsychological testing. Intellectual abilities were measured using the Wechsler Intelligence Scale for Children 4th or 5th edition. Associations between motor and intellectual functioning were examined separately in childhood and perinatal AIS groups. Clinical features associated with motor impairment were examined across the full sample.
Results:Motor functioning during early recovery was significantly associated with processing speed (r= -.391, p= .036) in the perinatal group and with overall intellectual functioning (r= -.414, p= .018) verbal intellectual abilities (r= -.444, p= .011), working memory (r= .393, p= .026), and processing speed (r= -.351, p= .042) in the childhood group. There were no associations between concurrent motor and intellectual functioning in the perinatal group, and only with processing speed (r= -.525, p= .002) in the childhood group. When motor functioning was dichotomized as no/mild motor deficit and moderate/severe motor deficit at Time 1, children in the perinatal group with moderate/severe motor deficit had significantly lower perceptual reasoning scores (f[28]= 2.15, p= .040) and participants in the childhood group with moderate/severe motor deficit had significantly lower perceptual reasoning (f[32]= 2.35, p= .025) and processing speed (f[32]= 2.14, p= 0.41) scores. There were no differences between no/mild and moderate/severe motor deficit groups for either perinatal or childhood AIS at Time 2. Clinical features associated with moderate/severe motor deficit at Time 1 were cortical+subcortical infarcts, large lesions, presenting with hemiparesis and seizures at time of neuropsychological assessment, and accessing occupational therapy and physical therapy.
Conclusions:Results suggest that motor functioning during early stroke recovery is associated with intellectual outcome, whereas motor functioning at time closest to neuropsychological assessment is not. This may be related neuroplastic changes post-injury, likely in frontal-subcortical connections, that result in observable motor deficits after stroke and affect subsequent hierarchal brain maturational processes thereby impacting later cognitive outcome. Different patterns of associations between motor functioning and specific intellectual abilities in perinatal and childhood groups suggest possible age-mediated effects on this relationship.
3 The Lived Experiences of Pediatric Stroke Survivors: A Qualitative Perspective on Psychosocial Outcomes and Quality of Life
- Angela Deotto, Claire Champigny, Robyn Westmacott, Karen Fergus, Mary Desrocher
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- Journal:
- Journal of the International Neuropsychological Society / Volume 29 / Issue s1 / November 2023
- Published online by Cambridge University Press:
- 21 December 2023, pp. 95-96
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Objective:
Despite knowledge concerning the prevalence and adverse consequences of pediatric stroke, there is limited awareness of the immediate and long-term effects on social-emotional functioning and psychological adjustment. Evidence from the broader childhood literature suggests that young individuals living with disabilities or neurological conditions are at considerably greater risk for emotional and behavioral concerns and lower quality of life. Qualitative research methodology can elucidate personal and subjective aspects of experience that cannot be entirely represented through quantitative measures. Although the parent experience of pediatric stroke has been qualitatively investigated, we endeavored to fill a gap in the pediatric stroke literature by focusing on the youth voice. The current project aimed to qualitatively explore emotional, behavioral, and social outcomes in pediatric stroke and identify personal and environmental factors that can influence psychological risk and resilience.
Participants and Methods:Individual interviews were conducted with 14 children, aged 8 to 18 years, with a history of ischemic stroke. The semi-structured interview protocol aimed to capture the lived experience of survivors and encompassed open-ended questions about daily life, memories, perceptions, and psychosocial experiences. Interviews spanned 40-60 minutes in length, were audio recorded, transcribed verbatim, and qualitatively analyzed using reflexive Thematic Analysis methodology. Coding, theme generation, and data visualization were completed using NVivo12 software.
Results:Participants discussed their views and understanding of their stroke, the perceived impact of stroke on their daily life, and the meaning-making process surrounding this experience. Children shared their perceptions regarding their abilities, challenges, life circumstances, aspirations, and relations to peers. Prominent themes encompassed shyness and social anxiety, cognitive and learning troubles, test anxiety, concealing feelings of sadness, the stigma of physical disability and its impact on social participation, bullying, and loneliness/isolation. Insight into adaptive coping mechanisms was present, as was emphasis on family closeness and the importance of supportive peers. Participants described feeling unique and were proud of their values and personal identity. Gratitude was expressed regarding stroke medical care and rehabilitative services, with an emergent theme surrounding the desire to give back to society.
Conclusions:Taken together, our qualitative study findings illustrate the profound impact that pediatric stroke can have on children’s emotional experiences, personal identity, self-efficacy, learning, behavior, and psychosocial functioning. Despite these challenges, an enormous degree of resiliency was also demonstrated in youth’s insights into coping and adaptation to challenge. Our findings speak to the importance of psychological assessment and treatment planning surrounding internalizing symptoms in children with stroke. Given the potential for pervasive changes in various aspects of daily life, a comprehensive understanding of the personal psychological experiences and perceptions of pediatric stroke patients is essential, as it will facilitate opportunity for timely interventions that can improve coping and adaptive outcome. Implications will be discussed with regard to empowering pediatric stroke survivors, enhancing public education efforts about childhood acquired brain injury, and reducing stigma associated with disability and use of required supports.
1 Predictors of Neurocognitive Outcome in Pediatric Ischemic and Hemorrhagic Stroke
- Claire M Champigny, Samantha J Feldman, Nataly Beribisky, Mary Desrocher, Tamiko Isaacs, Pradeep Krishnan, Georges Monette, Nomazulu Dlamini, Peter Dirks, Robyn Westmacott
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- Journal:
- Journal of the International Neuropsychological Society / Volume 29 / Issue s1 / November 2023
- Published online by Cambridge University Press:
- 21 December 2023, pp. 93-94
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Objective:
Neurocognitive deficits commonly occur following pediatric stroke and can impact many neuropsychological domains. Despite awareness of these deleterious effects, neurocognitive outcome after pediatric stroke, especially hemorrhagic stroke, is understudied. This clinical study aimed to elucidate the impact of eight factors identified in the scientific literature as possible predictors of neurocognitive outcome following pediatric stroke: age at stroke, stroke type (i.e., ischemic vs. hemorrhagic), lesion size, lesion location (i.e., brain region, structures impacted, and laterality), time since stroke, neurologic severity, seizures post-stroke, and socioeconomic status.
Participants and Methods:Ninety-two patients, ages six to 25 and with a history of pediatric stroke, chose to participate in the study and were administered standardized neuropsychological tests assessing verbal reasoning, abstract reasoning, working memory, processing speed, attention, learning ability, long-term memory, and visuomotor integration. A standardized parent questionnaire provided an estimate of executive functioning. Statistical analyses included spline regressions to examine the impact of age at stroke and lesion size, further divided by stroke type; a series of one-way analysis of variance to examine differences in variables with three levels; Welch’s t-tests to examine dichotomous variables; and simple linear regressions for continuous variables.
Results:Lesion size, stroke type, age at stroke, and socioeconomic status were identified as predictors of neurocognitive outcome in our sample. Large lesions were associated with worse neurocognitive outcomes compared to small to medium lesions across neurocognitive domains. Exploratory spline regressions suggested that ischemic stroke was associated with worse neurocognitive outcomes than hemorrhagic stroke. Based on patterns shown in graphs, age at stroke appeared to have an impact on outcome depending on the neurocognitive domain and stroke type, with U-shaped trends suggesting worse outcome across most domains when stroke occurred at approximately 5 to 10 years of age. Socioeconomic status positively predicted outcomes across most neurocognitive domains. Participants with seizures had more severe executive functioning impairments than youth without seizures. Youth with combined cortical-subcortical lesions scored lower on abstract reasoning than youth with cortical and youth with subcortical lesions, and lower on attention than youth with cortical lesions. Neurologic severity predicted scores on abstract reasoning, attention, processing speed, and visuomotor integration, depending on stroke type. There was no evidence of differences on outcome measures based on time since stroke, lesion laterality, or lesion region defined as supra-versus infratentorial.
Conclusions:The current study contributed to the scientific literature by identifying lesion size, stroke type, age at stroke, and socioeconomic status as predictors of neurocognitive outcome following pediatric stroke. Future research should examine other possible predictors of neurocognitive outcome that remain unexplored. Multisite collaborations would provide larger sample sizes and allow teams to build models with better statistical power and more predictors. Enhancing understanding of neurocognitive outcomes following pediatric stroke is a first step towards improving appraisals of prognosis.
Findings are clinically applicable as they provide professionals with information that can help assess individual expected patterns of recovery and thus refer patients to appropriate support services.
4 The Association Between Pro-Inflammatory Cytokines and C-Reactive Protein and the Cognitive and Neurological Outcome in Stroke Survivors: A Systematic Review
- Leila Kahnami, Sam Feldman, Maria Orlando, Robyn Westmacott, Mary Desrocher
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- Journal:
- Journal of the International Neuropsychological Society / Volume 29 / Issue s1 / November 2023
- Published online by Cambridge University Press:
- 21 December 2023, p. 96
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Objective:
Childhood ischemic and hemorrhagic stroke is often associated with neuropsychological and cognitive deficits. Stroke induces an inflammatory response in the central and peripheral nervous systems. High levels of inflammatory markers in the plasma have been associated with poorer cognitive outcomes. The role of inflammation in neurological prognosis of stroke has been studied previously; however, there is a limited understanding of the association between inflammatory markers and neuropsychological outcome post-stroke. The present review examined the existing literature on the association between inflammatory markers and post-stroke functioning.
Participants and Methods:Data bases (PsycINFO, PubMed, Web of Science, and Ovid) were reviewed in October 2020. Articles were restricted to English-language literature. Articles were included regardless of recruitment setting, number of strokes, mechanism of stroke, timing of blood collection and outcome assessment. The articles focused on patients with stroke (between the ages of 0 to 95), measured post-stroke outcome by neurological and cognitive outcome measures (i.e., it included findings on any aspect of cognition such as memory, information processing, or attention), and on pro-inflammatory cytokines and c-reactive proteins as measures of inflammation. The systematic literature search retrieved 954 articles to review against inclusion criteria. Descriptive statistics were performed using IBM SPSS 27.0 Statistics Software.
Results:A total of 18 articles were included in this review. The population age ranged from 21 to 95, and, when reported (n=17), mean participant age was 66.31. Among stroke patient populations, ischemic stroke was most researched (n=15). The most widely investigated biomarkers were CRP (n=9), IL-6 (n=8), TNF- a (n=7), IL-1 b (n=5), and IL-10 (n=5). The time of initial blood collection ranged from on admission to within 3 months poststroke. Equal number of studies used both neurological and cognitive tests (n=7), or only neurological (n=7), 2 studies only used cognitive tests, and one study used all three types of measures. The most commonly used cognitive test was the Mini Mental State Examination, MMSE (n=7). The next commonly used cognitive test was the Montreal Cognitive Assessment (MoCA), (n=4). Only two studies used a comprehensive neuropsychological battery.
Conclusions:There is a lack of research into diverse stroke populations. All the studies examined the association between inflammatory markers and the post-stroke outcomes in adult populations and mostly in patients with ischemic stroke. The lack of research on pediatric and young adult stroke represents a significant gap in understanding predictors of neurological and cognitive outcomes. Further, the review revealed a lack of comprehensive neurocognitive assessment post stroke, with most studies measuring neuropsychological outcome using brief cognitive instruments. Our findings highlight a critical need for addressing the above gaps to help elucidate the role of inflammatory markers in the neuropsychological prognosis of stroke in younger populations.
Understanding Early Childhood Resilience Following Neonatal Brain Injury From Parents’ Perspectives Using a Mixed-Method Design
- Tricia S. Williams, Kyla P. McDonald, Samantha D. Roberts, Robyn Westmacott, Nomazulu Dlamini, Emily W.Y. Tam
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- Journal:
- Journal of the International Neuropsychological Society / Volume 25 / Issue 4 / April 2019
- Published online by Cambridge University Press:
- 03 May 2019, pp. 390-402
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Objectives: The current study used a mixed-method design to qualitatively examine parents’ definitions of resilience and factors they believed optimized their child’s early outcome following neonatal brain injury. This was followed by quantitative analyses of early developmental and mental health outcomes and their relation to salient biopsychosocial factors. Methods: Participants were parents of children diagnosed with neonatal brain injury due to stroke or hypoxic-ischemic encephalopathy (N=51; age range of children 18 months to 8 years). The Parent Experiences Questionnaire (PEQ) was used to qualitatively analyze parents’ open-ended responses about their child’s early experiences and outcome. The Child Behavior Checklist (CBCL) and Scales of Independent Behaviour Early Developmental Form (SIB-ED) parent ratings were used to measure child resilience from a quantitative perspective, identifying “at-risk” and “resilient” children using standard cutoffs. “Resilient” and “at-risk” children were compared on biopsychosocial variables using univariate t tests and chi-square analyses. Results: Parents provided five unique definitions of their child’s positive outcomes, and many children demonstrated resilience based on parent perspectives and quantitative definitions. Supporting factors included close medical follow-up, early intervention, and intrinsic factors within the child and parent. Group comparisons of “resilient” and “at-risk” children highlighted the importance of parent mental health across these early developmental and mental health outcomes. Conclusions: Many children were described as resilient during the early years by parents using qualitative and quantitative approaches. Findings highlighted the importance of parent well-being in promoting optimal early outcomes. (JINS, 2019, 25, 390–402.)
Chapter 13 - Stroke
- Edited by Jacobus Donders, Scott J. Hunter, University of Chicago
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- Book:
- Neuropsychological Conditions Across the Lifespan
- Published online:
- 27 July 2018
- Print publication:
- 16 August 2018, pp 244-267
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Language Representation Following Left MCA Stroke in Children and Adults: An fMRI Study
- Robyn Westmacott, Mary Pat McAndrews, Gabrielle deVeber
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- Journal:
- Canadian Journal of Neurological Sciences / Volume 44 / Issue 5 / September 2017
- Published online by Cambridge University Press:
- 04 May 2017, pp. 483-497
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Background: In this case series, functional magnetic resonance imaging was used to examine brain networks that mediate different aspects of language function in 4 young adults (17-22 years) with a history of left middle cerebral artery (MCA) stroke in childhood (<7 years of age but after the neonatal period), and five older individuals (42-57 years) with left MCA stroke as adults (>40 years of age). Although it is widely believed that altered lateralization patterns are more likely to occur following early brain injuries compared with later brain injuries, the presumed plasticity of the young brain has been challenged in recent years, particularly in the domain of language. Methods: We explored this issue by contrasting the brain activation patterns of individuals with childhood left MCA stroke and adult left MCA stroke while performing two language tasks: verb generation and picture-word matching. Importantly, both groups showed significant recovery of language function, based on standard clinical indicators. Results: Controls showed left lateralized activation for both tasks, although much more pronounced for verb generation. Adult stroke patients also showed left lateralization for both tasks, though somewhat weaker than controls. Childhood stroke patients exhibited significantly weaker lateralization than the adult group for verb generation, but there was no significant group difference for picture-word matching. Conclusions: These preliminary findings suggest that successful reorganization of language function is more likely to involve bilateral recruitment following left MCA stroke in childhood than in adulthood. Of importance, although childhood stroke patients had primarily subcortical lesions, there were substantial alterations in cortical activation patterns.