Publications by authors named "Ung D"

Background And Purpose: Cultural and language barriers may affect quality of care, such as adherence to medications. We examined whether adherence to prevention medications within the year after stroke/transient ischemic attack (TIA) differed by region of birth.

Methods: An observational study of adults with stroke/TIA admitted to hospitals in the Australian Stroke Clinical Registry (Queensland, Victoria; 2012-2016; n=45 hospitals), with linked administrative data.

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Background: Given nurses' increasing international mobility, Asian internationally educated nurses (IENs) represent a critical human resource highly sought after within the global healthcare workforce. Developed countries have grown excessively reliant on them, leading to heightened competition among these countries. Hence, this review aims to uncover factors underlying the retention of Asian IENs in host countries to facilitate the development of more effective staff retention strategies.

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The ionotropic glutamate delta receptor GluD1, encoded by the GRID1 gene, is involved in synapse formation, function, and plasticity. GluD1 does not bind glutamate, but instead cerebellin and D-serine, which allow the formation of trans-synaptic bridges, and trigger transmembrane signaling. Despite wide expression in the nervous system, pathogenic GRID1 variants have not been characterized in humans so far.

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Article Synopsis
  • A study assessed the cost-effectiveness of an Individualised Management Program (IMP) for patients post-stroke or transient ischaemic attack (TIA) compared to usual care (UC).
  • The research involved a randomized controlled trial with 502 participants over 24 months, evaluating costs in Australian dollars and quality-adjusted life years (QALYs).
  • Results showed that the IMP was cost-effective from both health system and societal perspectives, with a probability of cost-effectiveness of 46.7% and 60.5%, respectively.
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Introduction: Little is known about the cost-effectiveness of government policies that support primary care physicians to provide comprehensive chronic disease management (CDM). This paper aimed to estimate the potential cost-effectiveness of CDM policies over a lifetime for long-time survivors of stroke.

Methods: A Markov model, using three health states (stable, hospitalised, dead), was developed to simulate the costs and benefits of CDM policies over 30 years (with 1-year cycles).

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Background: Understanding factors that influence the transition to permanent residential aged care following a stroke or transient ischemic attack may inform strategies to support people to live at home longer. We aimed to identify the demographic, clinical, and system factors that may influence the transition from living in the community to permanent residential care in the 6 to 18 months following stroke/transient ischemic attack.

Methods: Linked data cohort analysis of adults from Queensland and Victoria aged ≥65 years and registered in the Australian Stroke Clinical Registry (2012-2016) with a clinical diagnosis of stroke/transient ischemic attack and living in the community in the first 6 months post-hospital discharge.

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Article Synopsis
  • Governments are putting money into primary care policies aimed at chronic disease management, but there hasn't been enough large-scale evaluation on their effectiveness, especially after events like strokes or TIAs.
  • A study used data from the Australian Stroke Clinical Registry to look at whether these government-funded policies improve outcomes such as survival rates, hospital visits, and medication adherence post-stroke or TIA, comparing patients under these policies with those receiving usual care.
  • Findings showed that patients with chronic disease management claims had a 26% lower mortality rate and higher adherence to preventive medications, indicating that such policies can significantly improve long-term health outcomes after a stroke or TIA.
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The dihydropyrimidinase-like (DPYSL) proteins, also designated as the collapsin response mediators (CRMP) proteins, constitute a family of five cytosolic phosphoproteins abundantly expressed in the developing nervous system but down-regulated in the adult mouse brain. The DPYSL proteins were initially identified as effectors of semaphorin 3A (Sema3A) signaling and consequently involved in regulation of growth cone collapse in young developing neurons. To date, it has been established that DPYSL proteins mediate signals for numerous intracellular/extracellular pathways and play major roles in variety of cellular process including cell migration, neurite extension, axonal guidance, dendritic spine development and synaptic plasticity through their phosphorylation status.

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Background: Untreated poststroke mood problems may influence long-term outcomes. We aimed to investigate factors associated with receiving mental health treatment following stroke and impacts on long-term outcomes.

Methods: Observational cohort study derived from the Australian Stroke Clinical Registry (AuSCR; Queensland and Victorian registrants: 2012-2016) linked with hospital, primary care billing and pharmaceutical dispensing claims data.

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Article Synopsis
  • The study investigates the role of the ubiquitin pathway in amyotrophic lateral sclerosis (ALS) by analyzing genes associated with this pathway in 176 ALS patients.
  • Through next-generation sequencing, researchers identified both known and new pathogenic variants in these genes, highlighting the significance of the ubiquitin system in ALS.
  • One notable finding was the role of the NEDL1 gene, which encodes a protein linked to increased cell death and mislocalization of TDP-43, a protein critical to ALS pathology, suggesting a need for further research on NEDL1’s involvement in the disease.
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Background: Administrative data are used extensively for research purposes, but there remains limited information on the quality of these data for identifying comorbidities related to stroke.

Objective: To compare the prevalence of comorbidities of stroke identified using International Classification Diseases, Australian Modification (ICD-10-AM) or Anatomical Therapeutic Chemical codes, with those from (i) self-reported data and (ii) published studies.

Method: The cohort included patients with stroke or transient ischaemic attack admitted to hospitals (2012-2016; Victoria and Queensland) in the Australian Stroke Clinical Registry = 26,111).

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Background: Real-world evidence is limited on whether antihypertensive medications help avert major adverse cardiovascular events (MACE) after stroke without increasing the risk of falls. We investigated the association of adherence to antihypertensive medications on the incidence of MACE and falls requiring hospitalization after stroke.

Methods: A retrospective cohort study of adults who were newly dispensed antihypertensive medications after an acute stroke (Australian Stroke Clinical Registry 2012-2016; Queensland and Victoria).

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Background: Australian Primary Care Practitioners are incentivised through Medicare funded policies to provide chronic disease management and facilitate multidisciplinary care. Little is known about how these policies are claimed in the long-term management of stroke. The objective of this study was to describe the use of funded primary care policies for people with stroke by impairment status.

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Background: Evidence is growing on anticancer effects of statins. We investigated whether the effectiveness of treatment with statins after ischemic stroke on mortality is influenced by a history of cancer.

Methods: Analyses of 90-day survivors of ischemic stroke (2012-2016; 45 hospitals) using linked registry and administrative data.

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Introduction: Observational studies are increasingly being used to provide evidence on the real-world effectiveness of medications for preventing vascular diseases, such as stroke. We investigated whether the real-world effectiveness of treatment with lipid-lowering medications after ischemic stroke is affected by prevalent-user bias.

Methods: An observational cohort study of 90-day survivors of ischemic stroke using person-level data from the Australian Stroke Clinical Registry (2012-2016; 45 hospitals) linked to administrative (pharmaceutical, hospital, death) records.

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Purpose: To describe types of mental health treatment accessed by community-based stroke survivors and factors associated with access.

Methods: A sub-group of registrants from the Australian Stroke Clinical Registry completed a supplementary survey 2.5 years post-stroke.

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Purpose: Health-related quality of life (QoL) is poor after stroke, but may be improved with comprehensive care plans. We aimed to determine the effects of an individualized management program on QoL in people with stroke or transient ischemic attack (TIA), describe changes in QoL over time, and identify variables associated with QoL.

Methods: This was a multicenter, cluster randomized controlled trial with blinded assessment of outcomes and intention-to-treat analysis.

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Background And Purpose: Primary care physicians (PCPs) provide ongoing management after stroke. However, little is known about how best to measure physician encounters with reference to longer term outcomes. We aimed to compare methods for measuring regularity and continuity of PCP encounters, based on survival following stroke using linked healthcare data.

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Background: Mutations in the X-linked gene DDX3X account for approximately 2% of intellectual disability in females, often comorbid with behavioral problems, motor deficits, and brain malformations. DDX3X encodes an RNA helicase with emerging functions in corticogenesis and synaptogenesis.

Methods: We generated a Ddx3x haploinsufficient mouse (Ddx3x females) with construct validity for DDX3X loss-of-function mutations.

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Purpose: Breast cancer survivors (BrCS) experience many psychosocial difficulties following treatment, leading to an increased risk of psychological distress compared to the general population. This is especially true for underserved BrCS whose unmet supportive care needs can result in worse physical and mental health outcomes. This qualitative study compared healthcare and support providers' perceptions of BrCS' needs to survivors' perceptions of their own needs.

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Article Synopsis
  • * A study investigated 13 missense variants of PTCHD1, including both previously known and novel mutations found in male patients with intellectual disability (ID) and autism spectrum disorder (ASD).
  • * Functional tests revealed that six of these variants disrupt PTCHD1 protein levels and cause retention in the endoplasmic reticulum, indicating they may be pathogenic and supporting PTCHD1's role in ID and ASD.
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The 22q11.2 deletion syndrome (22q11DS) is associated with a wide spectrum of cognitive and psychiatric symptoms. Despite the considerable work performed over the past 20 years, the genetic etiology of the neurodevelopmental phenotype remains speculative.

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Purpose: Prescribed daily dose (PDD), the number of doses prescribed to be taken per day, is used to calculate medication adherence using pharmacy claims data. PDD can be substituted by (i) one dose per day (1DD), (ii) an estimate based on the 75th percentile of days taken by patients to refill a script (PDD ) or (iii) the World Health Organization's defined daily dose (DDD). We aimed to compare these approaches for estimating the duration covered by medications and whether this affects calculated 1-year adherence to antihypertensive medications post-stroke.

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Interfaces are an intrinsic component of nanoparticle catalysts and play a critical role in directing their function. Our understanding of the complexity of the nanoparticle interface and how to manipulate it at the molecular level has advanced significantly in recent years. Given this, attention is shifting towards the creation of designer nanoparticle interfaces that impact the activity and direct the mechanisms of inner-sphere catalytic reactions.

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Cobalt phosphide (CoP) is one of the most promising earth-abundant replacements for noble metal catalysts for the hydrogen evolution reaction (HER). Critical to HER is the binding of H atoms. While theoretical studies have computed preferred sites and energetics of hydrogen bound to transition metal phosphide surfaces, direct experimental studies are scarce.

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