Publications by authors named "Siew-Mei Yap"

Article Synopsis
  • Cervical dystonia (CD), while a movement disorder, has been recognized to significantly affect social cognition and psychological well-being, impacting quality of life beyond motor symptoms.
  • A study compared 20 individuals with CD to 20 healthy controls, utilizing emotional recognition tasks and assessments for anxiety and depression.
  • Results showed that participants with CD struggled more with recognizing complex emotions and had higher levels of anxiety and depression, underscoring the importance of addressing both cognitive and psychological challenges in CD treatment.
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Background: There is evidence that subjective fatigue can influence cognitive functioning in multiple sclerosis (MS). DeLuca et al.'s (2004) Relative Consequence Model proposes that impairments to other high-level cognitive functions, such as memory, result from the disease's effect on information processing speed.

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Background: Cognitive impairments are well-documented in multiple sclerosis (MS), while speech impairments are often overlooked despite their significant effect on quality of life. For effective clinical management of multisystem conditions such as MS, consideration should be given to the interaction between deficits in multiple domains, such as speech and cognition. To evaluate speech rate measures of spontaneous and read speech, in people with MS and to examine the link between speech and cognition.

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Article Synopsis
  • pwMS (people with multiple sclerosis) show significant impairments in word finding compared to healthy controls (HC), with slower processing speeds and worse outcomes in various language tasks.
  • Both types of MS (relapsing and progressive) demonstrated similar deficits, suggesting a consistent challenge in language areas across different MS stages.
  • Social cognition and prosody were not significantly different between MS patients and HC, indicating that word-finding issues may be more pronounced and not necessarily linked to mood disorders.
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Introduction: Cognitive impairment is common in multiple sclerosis at all stages of the condition. The natural history of cognition in multiple sclerosis has been considered to be deterioration of cognitive functioning over time. The development of the Brief International Cognitive Assessment for Multiple Sclerosis(BICAMS) has allowed standardization of a screening tool for cognitive impairment which can be easily performed in the neurology clinic.

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Article Synopsis
  • The study investigates vaccine hesitancy among people with multiple sclerosis (pwMS), noting that they are at a higher risk for complications from vaccine-preventable diseases.
  • pwMS showed a higher willingness to receive the SARS-CoV-2 vaccine compared to influenza and pneumococcal vaccines, with safety concerns being the main reason for hesitancy.
  • Recommendations from healthcare professionals significantly increased the likelihood of pwMS getting vaccinated, highlighting the importance of medical guidance in vaccination uptake.
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Background: Balance impairment is observed in up to 70% of people with MS (pwMS) and worsens with disease progression. Posturography using a force platform is the current gold standard in the measurement of balance. However, posturography has not been adequately studied or widely accepted for use as a disability outcome measure for pwMS.

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Clinical assessment of Multiple Sclerosis relies heavily on the Expanded Disability Status Scale, a non-linear rating system based on physician assessment of disease progression and walking ability. This inherently makes this method both subjective and limited in repeatability. This study developed a technically derived outcome measure of posture to compare a cohort of Multiple Sclerosis and Control subjects during an Eyes-Open and Eyes-closed task.

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Background: Autoimmune thyroid disease (AITD) occurs in 40%-50% of alemtuzumab-treated persons with multiple sclerosis (pwMS), most of whom will develop Graves' Disease (GD).

Objective: To explore contributory factors for alemtuzumab-related AITD in pwMS.

Methods: A retrospective patient chart review was performed.

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We report a patient with cat-scratch disease presenting with meningitis and neuroretinitis. This condition, caused by has a worldwide distribution and is among the most common infective causes of neuroretinitis. Bartonella neuroretinitis is a rare but under-recognised mimic of optic neuritis; it should be suspected in a patient with an infective prodrome whose fundus shows optic disc oedema and a macular star.

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Purpose: Ryanodine receptor 2 (RYR2) mutation is well-established in the aetiology of an inherited cardiac disorder known as catecholaminergic polymorphic ventricular tachycardia (CPVT). The RYR2 receptor is expressed in cardiomyocytes, and also in the hippocampus. The RYR2 mutation has not been reported as a potential cause of adult-onset genetic generalised epilepsy (GGE).

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A 15-year-old girl with a recent diagnosis of acute lymphoblastic leukaemia was admitted to hospital with pancytopaenia after having received high-dose intrathecal methotrexate 1 day prior. During the next week she had intermittent episodes of alternating hemiparesis associated with speech arrest lasting minutes to hours at a time. The episodes were not associated with altered level of consciousness or headache.

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Acute basilar artery occlusion is a neurological emergency. Unlike anterior circulation stroke presenting with hemiparesis, the symptoms of basilar artery occlusion are challenging to recognise in the emergency setting. Basilar artery occlusion can rarely lead to ischaemia of the auditory pathways, resulting in bizarre, positive auditory hallucinations.

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