Publications by authors named "Kyung-Bok Lee"

Background And Purpose: Neuronal intranuclear inclusion disease (NIID) is a progressive neurodegenerative disease characterized by a wide range of clinical manifestations. GGC-repeat expansion in was recently identified as the genetic cause of NIID. Here we report clinical, radiological, pathological, and genetic findings in NIID patients.

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Seawater electrolysis is a promising approach for sustainable and environmentally friendly hydrogen production, primarily because it has zero carbon emissions and mitigates freshwater resource scarcity. However, seawater electrolysis requires high selectivities for both the oxygen and hydrogen evolution reactions in an environment characterized by a high concentration of impurity ions, particularly Cl. In addition, the corrosion resistance of materials to byproducts is essential.

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Interactions between chemical drugs and their target proteins are fundamental to drug screening and precision therapy in modern clinical medicine. However, elucidating these interactions within living cells remains challenging due to the limited availability of efficient detection methods. Despite substantial efforts, technical limitations still impede the identification of direct interactors.

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Background And Purpose: The Treat Stroke to Target (TST) was a randomized clinical trial involving French and Korean patients demonstrating that a lower low-density lipoprotein cholesterol (LDL-C, <70 mg/dL) target group (LT) experienced fewer cerebro-cardiovascular events than a higher target (90-110 mg/dL) group (HT). However, whether these results can be applied to Asian patients with different ischemic stroke subtypes remains unclear.

Methods: Patients from 14 South Korean centers were analyzed separately.

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Probiotic oral delivery is challenged by harsh gastrointestinal conditions and environmental stressors in the body. This study presents the construction of durable nanoshells composed of an Fe-phytic acid metal-organic complex around individual probiotic cells, providing exceptional cytoprotective properties, in single-cell nanoencapsulation. Nanoencapsulated maintains high viability under simulated gastric fluid and the antibiotic tetracycline.

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We explored effects of (1) training with various sample sizes of multi-site vs. single-site training data, (2) cross-site domain adaptation, and (3) data sources and features on the performance of algorithms segmenting cerebral infarcts on Magnetic Resonance Imaging (MRI). We used 10,820 annotated diffusion-weighted images (DWIs) from 10 university hospitals.

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Background: Elevated heart rate in patients with acute ischemic stroke is associated with increased risk of mortality. Beta-blocker therapy is well known to reduce heart rate.

Methods And Results: This study was a post hoc analysis of patients with acute ischemic stroke with maximum heart rates ≥100 bpm.

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Objective: Pelvic inflammatory disease (PID) is an infection of female reproductive organs mainly in sexually active patients, which can cause serious complications throughout life. We aimed to analyze the risk factors and differences in sexually transmitted infections (STIs) between adolescents and adult PID patients.

Materials And Methods: We conducted a retrospective study based on descriptive and statistical analyses of the clinical records of patients with PID treated with antibiotics between January 2013 and December 2023 at Busan Paik Hospital.

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Article Synopsis
  • - This research presents a non-destructive technique for studying cellular signaling by using live cell imaging of fluorescent-tagged proteins, allowing the monitoring of signal transduction in real time.
  • - The study focuses on tracking the movement of protein kinase C (PKC) from the cytoplasm to the plasma membrane, by attaching RFP (red fluorescent protein) to a bait protein and GFP (green fluorescent protein) to the target protein.
  • - The effective visualization of the Raf-MEK-ERK signaling pathway demonstrated that the interaction between these proteins is influenced by the presence of the KSR1 scaffold protein, highlighting the complexity of cellular signaling networks.
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  • A study was conducted to develop deep learning algorithms for the automatic segmentation of white matter hyperintensity (WMH) lesions in patients with cerebral infarction, involving a large dataset of 8,421 patients from multiple hospitals in Korea.
  • Two models, 2D UNet and SE-Unet, were trained and validated using FLAIR MRI images, with performance measured against a human-segmented gold standard using various statistical metrics.
  • Results showed that while both models had good performance, the SE-Unet outperformed the UNet with higher average Dice Similarity Coefficients (DSCs) in both internal and external validations, indicating it was more reliable for WMH segmentation.
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Background: The landscape of stroke care has shifted from stand-alone hospitals to cooperative networks among hospitals. Despite the importance of these networks, limited information exists on their characteristics and functional attributes.

Methods: We extracted patient-level data on acute stroke care and hospital connectivity by integrating national stroke audit data with reimbursement claims data.

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  • Novel oral anticoagulants (NOACs) are recommended for stroke prevention in patients with acute ischemic stroke (AIS) and atrial fibrillation (AF), but their real-world effectiveness is unclear.
  • This study analyzed data from nearly 13,000 patients over eight years to examine trends in clinical outcomes related to AIS and AF, particularly looking at how NOAC prescriptions influenced these trends.
  • Results showed that NOAC prescriptions rose significantly from 0% to 75.6%, correlating with a decrease in 1-year incidences of major adverse outcomes from 28.3% to 21.7%, suggesting NOACs may play a key role in improving patient outcomes.
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  • Recent research indicates a lack of interchangeability between modified Rankin Scale measures of functional outcomes and mortality measures in assessing hospital performance for acute ischemic stroke patients.
  • The study evaluated 8292 hospitalized stroke patients and used various metrics like 1-month and 1-year mortality to assess hospital outcomes.
  • Findings revealed no significant correlation between hospitals’ rankings based on functional outcomes and those based on mortality rates, suggesting that these measures evaluate different aspects of hospital performance.
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  • Elevated body mass index (BMI) and waist circumference (WC) may actually protect stroke survivors from recurrent strokes and major vascular events, contrary to the general belief that higher BMI is solely a risk factor for stroke.
  • The study involved analyzing data from nearly 15,000 first-ever stroke patients over a period from 2011 to 2019, focusing on different BMI and WC categories to assess their impact on long-term vascular outcomes.
  • Findings indicated that being in the second-BMI quintile and fourth-WC quintile was associated with the lowest risks for recurrent strokes and major vascular events, suggesting that some levels of excess weight might be beneficial post-stroke.
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  • Ischemia-reperfusion (IR) injury is a major cause of acute kidney injury (AKI) and is linked to succinate accumulation, which leads to harmful reactive oxygen species (ROS) and severe kidney damage.
  • Research on PDK4, a mitochondrial enzyme, shows that knocking it out or inhibiting it reduces IR-induced kidney damage by lowering succinate levels and ROS production during reperfusion.
  • The study concludes that targeting PDK4 could be an effective way to prevent kidney injury during IR events by minimizing succinate accumulation and protecting mitochondrial function.
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Manipulation and control of cell chemotaxis remain an underexplored territory despite vast potential in various fields, such as cytotherapeutics, sensors, and even cell robots. Herein is achieved the chemical control over chemotactic movement and direction of Jurkat T cells, as a representative model, by the construction of cell-in-catalytic-coat structures in single-cell nanoencapsulation. Armed with the catalytic power of glucose oxidase (GOx) in the artificial coat, the nanobiohybrid cytostructures, denoted as Jurkat , exhibit controllable, redirected chemotactic movement in response to d-glucose gradients, in the opposite direction to the positive-chemotaxis direction of naïve, uncoated Jurkat cells in the same gradients.

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This study aimed to examine the effects of several essential oils on insomnia in dementia patients following transdermal treatment (aromatherapy). The mean change rates (%) of sleep biomarkers were compared between the single essential and jojoba (vehicle) oil massage groups in this study. The lavender (L) essential oil massage group demonstrated a significant decrease in the mean change rate (%) of 24-h urinary free cortisol, whereas the valerian (V) essential oil massage group demonstrated a significant increase in the mean change rate (%) of serum 5-hydroxytryptamine.

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Background: Optimal antithrombotic regimens to prevent recurrent stroke in patients with ischemic stroke due to atrial fibrillation (AF) and atherosclerotic large-vessel stenosis remain unknown.

Aims: This study aimed to evaluate the effect of multiple antithrombotic therapies on outcomes at 1 year after ischemic stroke due to two or more causes.

Methods: We identified 862 patients with ischemic stroke due to AF and large artery atherosclerosis from the linked data.

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  • Oxiracetam may help prevent cognitive decline post-stroke, and this trial evaluates its effectiveness alongside exercise to see if physical activity influences treatment outcomes.
  • The study is a phase IV trial involving 500 patients, assessing changes in cognitive function through various measures while participants take either oxiracetam or a placebo for 36 weeks.
  • Researchers will analyze data, including brain activity and physical activity levels, to explore the relationship between exercise, medication, and cognitive recovery following a stroke.
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Objective: Serous tubal intraepithelial carcinoma (STIC) is a known precursor of high-grade serous ovarian cancer (HGSOC). This study aimed to evaluate the proportion of STIC in patients with HGSOC and analyze the STIC-related prognosis in patients with HGSOC.

Materials And Methods: All pathology reports at our institution that included bilateral salpingectomies of patients with HGSOC from January 2013 to December 2018 were reviewed by two experienced pathologists.

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Aims: Whether admission hyperglycemia is differentially associated with early vascular outcomes in acute ischemic stroke (AIS) depending on stroke subtype has been incompletely delineated.

Methods: In a multicenter, prospective stroke registry, patients with AIS were categorized based on admission glucose levels into normoglycemia, moderate hyperglycemia, and severe hyperglycemia (<140mg/dl, 140-179mg/dl, and ≥180mg/dl, respectively) groups. Multivariate analysis assessed the interaction between the hyperglycemia and ischemic stroke subtypes of large artery atherothrombosis (LAA), cardioembolism (CE), and small vessel occlusion (SVO) and early vascular outcomes (3-month stroke, all-cause mortality, and composite of stroke, MI, and all-cause mortality).

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  • The study investigated the prevalence of 15 genetic variants associated with stroke in a large, unselected cohort of young patients, highlighting that heritability might not be low among this demographic.
  • Out of 1,033 patients, 12.7% were found to have clinically relevant genetic variants, predominantly in the RNF213, ABCC6, and NOTCH3 genes, with variation in frequency based on stroke subtype and age group.
  • Notably, most patients with these variants did not exhibit typical neuroimaging features of the related disorders, indicating the need for further research on the clinical significance of these genetic findings.
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  • A study analyzed data from over 14,000 ischemic stroke patients to investigate early neurologic deterioration (END) due to stroke progression or recurrence, finding that 11.6% of patients experienced this complication.
  • Among those with END, active management was applied to 64.2% of patients, using various strategies like volume expansion and changes in medication to address the issue.
  • Patients receiving active management showed significantly better outcomes, with increased rates of functional independence and reduced disability three months post-stroke compared to those who did not receive active management.
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Background: We aimed to evaluate covert brain infarction (CBI), frequently encountered during the diagnostic work-up of acute ischemic stroke, as a risk factor for stroke recurrence in patients with atrial fibrillation (AF).

Methods: For this prospective cohort study, from patients with acute ischemic stroke hospitalized at 14 centers between 2017 and 2019, we enrolled AF patients without history of stroke or transient ischemic attack and divided them into the CBI (+) and CBI (-) groups. The 2 groups were compared regarding the 1-year cumulative incidence of recurrent ischemic stroke and all-cause mortality using the Fine and Gray subdistribution hazard model with nonstroke death as a competing risk and the Cox frailty model, respectively.

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