Publications by authors named "Mark T MacKay"

Introduction: Arterial ischemic stroke (AIS) represents a significant cause of neurological morbidity and mortality in the pediatric population, with reported mortality rates ranging from 2% to 9%. The growing evidence supporting the efficacy and safety of reperfusion therapies in pediatric AIS underscores the critical importance of timely and accurate diagnosis. There are many barriers to achieving this, including a lack of clinical recognition and diagnostic imaging delays.

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Background And Objectives: Developmental impairment is common in individuals with -related disorders, although descriptions are limited. We aimed to determine trajectories and outcomes of development and adaptive function.

Methods: This was a mixed retrospective cross-sectional study of individuals from an international Natural History Study, who had neurologic/neurodevelopmental disorders due to an variant.

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Objective: Bell's palsy is a sudden unilateral weakness of the facial muscles due to idiopathic lower motor neuron palsy of cranial nerve VII. We set out to determine the level of agreement in the severity of facial palsy based on the House-Brackmann scale between face-to-face assessment by clinicians, and independent clinician assessment of photographs and videos.

Design: Secondary analysis of children enrolled in a triple blind, randomised controlled trial assessing recovery rates following steroid treatment versus placebo for Bell's palsy who had photographs and videos recorded initially and at subsequent reviews.

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Background: Childhood arterial ischemic stroke (AIS) is associated with substantial long-term morbidity. This study aims to describe factors associated with recurrence, mortality, and neurological disability.

Methods: Australian children with radiologically confirmed AIS were enrolled prospectively to the Royal Children's Hospital stroke registry from 2003 to 2017.

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Background: Pediatric hemorrhagic stroke (HS) poses a significant burden. We aimed to examine the incidence rate of pediatric hemorrhagic stroke globally.

Method: This systematic review and meta-analysis searched Medline via Ovid, Embase, EBCOHOST, Scopus and Google Scholar up to 6 March 2024 for observational studies included pediatrics' incidence rate of hemorrhagic stroke (PROSPERO: CRD42022312643).

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Purpose: This scoping review aimed to inform future research priorities by collating evidence on neural correlates of speech and language recovery following childhood stroke.

Methods: Neuroimaging, motor speech, or language outcomes following childhood stroke (28 days to 18 years age) in the subacute to chronic community stages (care occurring after acute medical management, including inpatient and outpatient rehabilitation, and community-based programs) were identified and extracted from Medline, Embase, PsycInfo, and Clinical databases.

Results: Of the 3990 studies screened, 11 met the inclusion criteria.

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Background: Information on the medium-term recovery of children with Bell palsy or acute idiopathic lower motor neuron facial paralysis is limited.

Methods: We followed up children aged 6 months to <18 years with Bell palsy for 12 months after completion of a randomized trial on the use of prednisolone. We assessed facial function using the clinician-administered House-Brackmann scale and the modified parent-administered House-Brackmann scale.

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Article Synopsis
  • - The study aimed to determine the birth prevalence of perinatal stroke in term infants and identify associated risk factors, despite some factors being present in healthy infants, which complicates risk assessment.
  • - Researchers analyzed perinatal stroke data from 2017 to 2019, finding a prevalence of 9.6 per 100,000 live births, with most cases (87%) showing multiple risk factors like cesarean section and low Apgar scores.
  • - The study concluded that while certain risk factors are statistically significant, they do not fully explain the causes of perinatal stroke, indicating a need for further validation through case-control studies.
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Purpose: To study seizure manifestations and outcomes in children with cortical versus white matter injury, differences potentially explaining variability of epilepsy in children with cerebral palsy.

Methods: In this population-based retrospective cohort study, MRIs of children with cerebral palsy due to ischemia or haemorrhage were classified according to presence or absence of cortical injury. MRI findings were then correlated with history of neonatal seizures, seizures during childhood, epilepsy syndromes, and seizure outcomes.

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Objective: To describe the prevalence and severity of pain experienced by children with Bell's palsy over the first 6 months of illness and its association with the severity of facial paralysis.

Methods: This was a secondary analysis of data obtained in a phase III, triple-blinded, randomised, placebo-controlled trial of prednisolone for the treatment of Bell's palsy in children aged 6 months to <18 years conducted between 13 October 2015 and 23 August 2020 in Australia and New Zealand. Children were recruited within 72 hours of symptom onset and pain was assessed using a child-rated visual analogue scale (VAS), a child-rated Faces Pain Score-Revised (FPS-R) and/or a parent-rated VAS at baseline, and at 1, 3 and 6 months until recovered, and are reported combined across treatment groups.

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Objective: To describe and assess performance of the Correlate Of Injury to the Nervous system (COIN) index, a quantitative electroencephalography (EEG) metric designed to identify areas of cerebral dysfunction concerning for stroke.

Methods: Case-control study comparing continuous EEG data from children with acute ischemic stroke to children without stroke, with or without encephalopathy. COIN is calculated continuously and compares EEG power between cerebral hemispheres.

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Background And Objectives: Research investigating neonatal arterial ischemic stroke (NAIS) outcomes have shown that combined cortical and basal ganglia infarction or involvement of the corticospinal tract predict cerebral palsy (CP). The research question was whether voxel-based lesion-symptom mapping (VLSM) on acute MRI can identify brain regions associated with CP and neurodevelopmental impairments in NAIS.

Methods: Newborns were recruited from prospective Australian and Swiss pediatric stroke registries.

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Article Synopsis
  • A study focused on children with cerebral palsy and epilepsy aimed to determine how often they experience paroxysmal nonepileptic events and identify any related factors.
  • Analyzing data from 256 children, researchers found that 26% experienced paroxysmal nonepileptic events, with many of these children also having epileptic events.
  • Parents often misidentified nonepileptic events as epileptic, emphasizing the importance of better education and counseling for families about seizure types and their characteristics.
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Background And Objectives: Bell palsy is the third most frequent diagnosis in children with sudden-onset neurologic dysfunction. The cost-effectiveness of treating Bell palsy with prednisolone in children is unknown. We aimed to assess the cost-effectiveness of prednisolone in treating Bell palsy in children compared with placebo.

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Objective: Currently there is no parent administered scale for facial nerve function in children. We set out to assess the agreement between a newly developed parent-administered modified version of the House-Brackmann (HB) scale and the standard clinician-administered HB scale in children with Bell's palsy.

Study Design: Secondary analysis of a triple-blind, randomized, placebo-controlled trial of corticosteroids to treat idiopathic facial paralysis (Bell's palsy) in children (6 months to <18 years).

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Background: Despite its importance in being among the top 10 causes of childhood death, there is limited data on the incidence of stroke in children and whether this has changed over time.

Aims: We performed a systematic review and meta-analysis to estimate the worldwide incidence rate of pediatric ischemic stroke, identify population differences, and assess trends in incidence.

Methods: We screened three databases (Medline, Embase, and Cumulative Index of Nursing and Allied Health Literature (CINAHL)) and a Google Search was performed up to October 2021.

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Pediatric stroke is unfortunately not a rare condition. It is associated with severe disability and mortality because of the complexity of potential clinical manifestations, and the resulting delay in seeking care and in diagnosis. Neuroimaging plays an important role in the multidisciplinary response for pediatric stroke patients.

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Cerebral palsy (CP) is a broad diagnosis unbound by aetiology and is based on a clinical examination demonstrating abnormalities of movement or posture. CP represents a static neurological condition, provided that neurodegenerative conditions, leukoencephalopathies and neuromuscular disorders are excluded. In paediatrics, the genetic conditions associated with CP are rapidly increasing, with primary and overlapping neurodevelopmental conditions perhaps better categorised by the predominant clinical feature such as CP, intellectual disability, autism spectrum disorder or epilepsy.

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Background And Objectives: Corticosteroids are used to treat the early stages of idiopathic facial paralysis (Bell palsy) in children, but their effectiveness is uncertain. We set out to determine whether prednisolone improves the proportion of children with Bell palsy with complete recovery at 1 month.

Methods: We conducted a double-blind, placebo-controlled, randomized trial of prednisolone in children presenting to emergency departments with Bell palsy.

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Introduction: Adolescents and adults with a Fontan circulation are at risk of cognitive dysfunction; Attention and processing speed are notable areas of concern. Underlying mechanisms and brain alterations associated with worse long-term cognitive outcomes are not well determined. This study investigated brain white matter microstructure in adolescents and adults with a Fontan circulation and associations with resting and peak exercise oxygen saturations (SaO), predicted maximal oxygen uptake during exercise (% pred VO), and attention and processing speed.

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Article Synopsis
  • The study focused on children with cerebral palsy from vascular injuries to determine the prevalence of epilepsy syndromes and understand their treatment needs and prognosis.* -
  • Out of 256 children studied, 36% experienced seizures, with the majority showing a self-limited focal epilepsy-variant linked to various types of brain injuries, particularly in those classified with severe motor impairments.* -
  • The research found that some children's epilepsy syndromes changed over time, highlighting the complexity of their conditions and the need for ongoing monitoring and adjustment in diagnoses.*
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Objective: In paediatric migraine, ibuprofen, acetaminophen and triptans are safe, effective therapies but there is scant paediatric data informing second-line emergency treatment.

Methods: Retrospective cohort study of children diagnosed with migraine at a tertiary children's hospital ED.

Results: There were 207 children with migraine over a 1 year period.

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Stroke is an important cause of neurological morbidity in children; most survivors have permanent neurological deficits that affect the remainder of their life. Stroke in childhood, the focus of this Primer, is distinguished from perinatal stroke, defined as stroke before 29 days of age, because of its unique pathogenesis reflecting the maternal-fetal unit. Although approximately 15% of strokes in adults are haemorrhagic, half of incident strokes in children are haemorrhagic and half are ischaemic.

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Recent trials provide high-quality evidence for second-line treatment of convulsive status epilepticus (CSE) in children. However, the most effective medications for other seizure emergencies are poorly understood without established treatment algorithms. We investigated children presenting to the emergency department with repetitive or prolonged convulsions who required intravenous long-acting antiseizure medications, to determine the relative importance and treatment responsiveness of status epilepticus and seizure clusters.

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Early evidence for the benefit of mechanical thrombectomy (MT) in pediatric patients with intracranial large vessel occlusion has been shown in previous retrospective cohorts. Higher-level evidence is needed to overcome the limitations of these studies such as the lack of a control group and the retrospective design. Randomized trials will very likely not be feasible, and several open questions remain, for example, the impact of arteriopathic etiologies or a possible lower age limit for MT.

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