Publications by authors named "Seung Chul Hong"

Article Synopsis
  • - This study investigates the medical comorbidities associated with obstructive sleep apnea (OSA) in Korea, using a large national healthcare database from 2010 to 2019 to analyze the data.
  • - Results show that patients with OSA have a higher risk of ischemic heart disease, stroke, and other related conditions like metabolic syndrome, chronic kidney disease, and more, especially among women who also have increased instances of liver and respiratory diseases.
  • - The findings confirm that OSA significantly raises the risk of cardiovascular complications in Korean patients, paralleling previous research in western countries, marking it as a key study in Asia.
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  • The study investigates the differences in brain activity between young adults with ADHD and those without ADHD using quantitative EEG (QEEG) assessments.
  • The results show significant variations in brain wave patterns, particularly increased delta power and decreased beta power in ADHD patients compared to non-ADHD individuals.
  • The findings suggest that QEEG may be a useful diagnostic tool for identifying ADHD in young adults based on their brain wave characteristics.
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Objective: This narrative review aims to provide a comprehensive assessment of the existing literature on the relationship between hypnotics and dementia, considering both potential link and inconclusive or lack of association.

Methods: Data from studies that investigate the association between hypnotic medications and dementia were reviewed. Studies included both cohort studies and systematic reviews, participants with various type of dementia and hypnotics including benzodiazepines (BZDs) and Z-drugs (ZDs).

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Background: The objectives of this cross-sectional study were to explore the relationship between weekend catch-up sleep (WCUS) and the risk of prediabetes/diabetes and to assess how this risk varies based on WCUS duration, using a large population sample in South Korea.

Methods: Data were sourced from the 2021 Korea National Health and Nutrition Examination Survey, involving 2472 subjects aged 30 years and above, employed, and not using blood glucose-lowering medications. Prediabetes/diabetes risk was examined based on the presence of WCUS.

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Objective: : Antipsychotic drugs are known as the major cause of non-neoplastic hyperprolactinemia. This study aimed to investigate the levels of serum prolactin depending on the use of antipsychotic drugs in patients through the Clinical Data Warehouse (CDW).

Methods: : We conducted a cohort search in the CDW application and got 260 patients' medical records diagnosed with schizophrenia, schizotypal and delusional disorders, manic episodes, and bipolar affective disorders who were taking one of risperidone, blonanserin, amisulpride, and olanzapine.

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Article Synopsis
  • * The study analyzed over 6,000 NT1 cases and identified new genetic associations (e.g., CD207, NAB1) tied to immune response, particularly involving T cells.
  • * Results suggest that genetic factors in NT1 also relate to other autoimmune diseases, indicating a shared immune mechanism influenced by environmental factors like infections and vaccinations.
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  • The study aimed to find the incidence rate of narcolepsy in South Korea and its connection to other systemic autoimmune diseases.
  • Researchers analyzed data from a nationwide health insurance claims database between 2010 and 2019, comparing narcolepsy patients with matched controls.
  • They found that narcolepsy has an incidence of 0.05% and is significantly linked to autoimmune diseases like ankylosing spondylitis and rheumatoid arthritis, particularly those associated with HLA genes.*
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Background: Several studies have suggested a link between panic disorder (PD) and cardiovascular disease (CVD). However, the extent to which PD confers risk for CVD is still unclear, particularly in diabetics, a group showing high risk for CVD.

Methods: A nationwide population-based cohort of 1,624,718 patients with type 2 diabetes were selected from the National Health Screening Program database covering the years 2009 to 2012.

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Background: Previous studies have suggested a close link between sleep disturbances and diabetic retinopathy (DR). However, to date, no confirmatory findings have been reported. We aimed to explore the risk of insomnia in DR by considering demographic factors and diabetes mellitus (DM)-related variables.

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Objective: Recently data has been accumulated regarding the role of coping strategies in the relationship between stress and sleep quality. Therefore, we set out to identify the mediating effects of coping strategies between stress and sleep quality.

Methods: A online-based cross-sectional study was performed using the Perceived Stress Scale-10, the Pittsburgh Sleep Quality Index, and a simplification of the 60-item Coping Orientation to Problems Experienced (Brief COPE) inventory in the nonclinical adult sample.

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Study Objectives: Kleine-Levin syndrome (KLS) is characterized by relapsing-remitting episodes of hypersomnia, cognitive impairment, and behavioral disturbances. We quantified cerebrospinal fluid (CSF) and serum proteins in KLS cases and controls.

Methods: SomaScan was used to profile 1133 CSF proteins in 30 KLS cases and 134 controls, while 1109 serum proteins were profiled in serum from 26 cases and 65 controls.

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Purpose: Narcolepsy is a chronic disorder and its phenotype is dichotomized into narcolepsy type 1 (NT1) and narcolepsy type 2 (NT2). The clinical course and pathophysiological mechanisms of these two clinical entities and their differences are not adequately defined. This study aimed to explore the differential longitudinal patterns of polysomnography (PSG) and multiple sleep latency test (MSLT) in NT1 and NT2.

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Article Synopsis
  • - Kleine-Levin syndrome (KLS) is a rare disorder causing severe episodes of sleepiness, cognitive issues, and changes in behavior, with unclear causes linked to brain activity and difficult births.
  • - A global study identified a significant genetic association (rs71947865) related to KLS, particularly prevalent in patients with difficult birth histories and previously connected to bipolar disorder and schizophrenia.
  • - Despite variations in findings across different sample sizes, the research highlights potential genetic and environmental factors, specifically involving circadian rhythms, that may contribute to the risk of developing KLS.
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Bipolar disorder (BPD) is debilitating disorder, and patients can experience multiple relapses and subsequent hospitalizations. Since pharmacotherapy is the mainstay of treatment for patients with BPD, investigations on the effects of atypical antipsychotics (AAP) on reducing rehospitalization risk are crucial. The objective of study is to explore predictors of 1-year rehospitalization in patients with bipolar I disorder treated with AAP.

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Background: Recently, studies have been conducted to address the research gap in the understanding of poor-quality sleep and its relationship to health outcomes, through the evaluation of sleep quality. The aim of this study was to provide information regarding poor sleep quality based on a nationwide general population sample in Korea.

Methods: We conducted a cross-sectional study using data from a nationwide sample of 165,193 individuals (males: 44%) aged 19 years or older from the 2018 Korea Community Health Survey.

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Analysis of sleep for the diagnosis of sleep disorders such as Type-1 Narcolepsy (T1N) currently requires visual inspection of polysomnography records by trained scoring technicians. Here, we used neural networks in approximately 3,000 normal and abnormal sleep recordings to automate sleep stage scoring, producing a hypnodensity graph-a probability distribution conveying more information than classical hypnograms. Accuracy of sleep stage scoring was validated in 70 subjects assessed by six scorers.

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Study Objectives: Narcolepsy is a chronic disorder with numerous adverse long-term consequences including increased obesity, high mortality rates, and decreased quality of life. With emerging attention to the long-term course of the disorder and importance of accurate diagnosis, the diagnostic stability of the Multiple Sleep Latency Test (MSLT)-the mostly frequently used test to identify narcolepsy-is often challenged.

Methods: In this study, we compared the baseline and follow-up demographic characteristics and body mass index (BMI) of patients with narcolepsy type 1.

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Previous studies reported some relationships between donepezil treatment and hippocampus in Alzheimer's disease (AD). However, due to methodological limitations, their close relationships remain unclear. The aim of this study is to predict treatment response to donepezil by utilizing the automated segmentation of hippocampal subfields volumes (ASHS) in AD.

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Attention-deficit hyperactivity disorder (ADHD) is notorious for its debilitating consequences and early age of onset. The need for early diagnosis and intervention has frequently been underscored. Previous studies have attempted to clarify the bidirectional relationship between ADHD and sleep problems, proposing a potential role for sleep problems as early predictors of ADHD.

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Parkinson's disease dementia (PDD) is notorious for its debilitating clinical course and high mortality rates. Consequently, various attempts to investigate predictors of cognitive decline in Parkinson's disease (PD) have been made. Here we report a case of a 75-year-old female patient with PD who visited the clinic with complaints of recurrent visual hallucinations and cognitive decline, whose symptoms were ameliorated by the titration of rivastigmine.

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Objective: Sleep problems are common among patients with attention-deficit hyperactivity disorder (ADHD), and are considered major causes of behavioral and cognitive dysfunction in ADHD patients. In the present study, we investigated the relationship between sleep parameters and cognitive function in drug-naïve children with ADHD.

Methods: Twenty-eight patients were recruited to participate in the study, and a polysomnography was used to measure sleep parameters of the subjects.

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