Publications by authors named "Sun A Choi"

African swine fever (ASF) causes severe disease in domestic pigs and wild boars and often results in 100% mortality. The use of attenuated strains in ASF vaccine development, based on the most recently studied ASF virus (ASFV)-Georgia (ASFV-G) strain, has proven effective. In July 2023, Vietnam became the first country in the world to have two indigenously developed ASF vaccines approved for commercial sale locally.

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Background: Myasthenia gravis (MG) is a rare neuromuscular disorder with an estimated prevalence of 37 per 100,000 individuals in the United States. Despite patients with MG using a wide range of health care services, there is a lack of information regarding health care costs and health care resource utilization (HCRU).

Objective: To gain insight into the health care cost and HCRU associated with an MG diagnosis from the US payer perspective.

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African swine fever virus (ASFV) has substantially spread worldwide, resulting in significant economic losses in the swine industry. Despite extensive research, no ASF vaccine has surpassed the effectiveness of live attenuated vaccines. For instance, the live attenuated vaccine ASFV-G-ΔI177L/ΔLVR has demonstrated good efficacy and safety, along with prolonged persistence of ASF antibodies after vaccination.

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Objective: This study aimed to assess the long-term outcome and prognostic factors of vagus nerve stimulation (VNS) for drug-resistant epilepsy (DRE) using real-world data.

Method: We included 189 DRE patients who underwent VNS implantation between 2005 and 2018 at nine national hospitals in Korea. Seizure-frequency data obtained quarterly one year before and after surgery and annually up to four years after surgery were collected from medical records.

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The recent development of NH as a fuel has led to significant emissions of NO, a major greenhouse gas. Direct catalytic NO decomposition (de-NO) is a promising technology for NO emissions control because it effectively decomposes NO at low temperatures without requiring reducing agents or producing other pollutants. In marine applications, to improve the flame properties, NH is often mixed with marine diesel oil, which contains sulfur.

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Background: In the United States (US), hepatitis C virus (HCV) screening is not covered by payers in settings outside of primary care. A non-traditional, emergency department (ED)-based HCV screening program can be cost-effective and identify infection in vulnerable populations with a high HCV risk. This study examined the long-term cost-effectiveness of routine HCV screening and linkage-to-care for high-risk patients in the ED from the payer's perspective.

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Background: Impaired visuomotor integration (VMI) is commonly observed in children with developmental delay (DD). This pilot study aimed to evaluate the effects of tablet computer-based cognitive training on the VMI in children with DD.

Methods: This study included children aged 4 to under 18 years diagnosed with DD.

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Article Synopsis
  • Pediatric multiple sclerosis (MS) and neuromyelitis optica (NMO) are rare in South Korea, with low incidence and prevalence rates among those under 20 years old from 2016 to 2020.
  • The study revealed significant disparities in healthcare access, with most patients receiving care in urban tertiary hospitals, especially in Seoul, compared to rural areas.
  • The economic burden of managing these rare diseases is considerable, highlighting the need for tailored healthcare policies to improve access and reduce regional disparities in care.
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Chromosome 17q12 deletion syndrome (OMIM #614527) is a rare genetic disorder associated with a heterozygous 1.4-1.5 Mb deletion at chromosome 17q12, leading to a spectrum of clinical manifestations, including kidney abnormalities, neurodevelopmental delay, maturity-onset diabetes of the young type 5 (MODY5), and Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome.

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Introduction: Studies show that medications for opioid use disorder (MOUD) reduce illicit opioid use, emergency healthcare services, opioid-related overdose, and death. However, few studies have investigated the long-term cost-effectiveness of MOUD in office-based opioid treatment (OBOT) and opioid treatment program (OTP) settings. We aimed to estimate the cost, utility, quality-adjusted life years gained (QALYs), and incremental cost-effectiveness ratios (ICERs) of three MOUD compared to each other and counseling without medication from a US healthcare sector perspective.

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Dementia is a clinical syndrome characterized by progressive impairment of cognitive and functional abilities. As currently applied treatments for dementia can only delay the progression of dementia and cannot fundamentally cure it, much attention is being paid to reducing its incidence by preventing the associated risk factors. Cardiovascular and metabolic diseases are well-known risk factors for dementia, and many studies have attempted to prevent dementia by treating these risk factors.

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Background: Acute disseminated encephalomyelitis (ADEM) is an immune-mediated demyelinating disorder of the central nervous system that is usually triggered by infections. We aimed to determine the temporal trends in the incidence of ADEM before and during the pandemic and their correlation with viral epidemiology.

Methods: We conducted a nationwide, population-based, retrospective, ADEM cohort study by using the Health Insurance Review and Assessment Service database.

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Objectives: Guillain-Barré syndrome (GBS) is an immune-mediated polyradiculoneuropathy, often triggered by infection. We aimed to investigate how the incidence of GBS changed in the early stages of the coronavirus 2019 (COVID-19) pandemic when nationwide infections declined due to non-pharmaceutical interventions.

Methods: We conducted a nationwide population-based retrospective GBS cohort study using data from the Health Insurance Review and Assessment Service of Korea.

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Article Synopsis
  • The Korean Undiagnosed Diseases Program (KUDP) ran for three years to help patients who didn't have a diagnosis and to create systems for better research in the future.* -
  • A total of 458 patients were studied, and doctors were able to find diagnoses for over half of them, using advanced genetic testing methods.* -
  • The program also built a special research lab and created a computer system to help manage and share information about these patients and their conditions.*
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Background And Objectives: The outcome of status epilepticus (SE) largely varies depending on clinical characteristics. Risk stratification is necessary for tailoring the aggressiveness of treatment and predicting outcomes of individual patients with SE. In this study, we assessed differences in mortality, neurologic disability, and prognostic factors associated with SE across sociodemographic and clinical characteristics.

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Background: PURA-related neurodevelopmental disorders (PURA-NDDs) include 5q31.3 deletion syndrome and PURA syndrome. PURA-NDDs are characterized by neonatal hypotonia, moderate to severe global developmental delay/intellectual disability (GDD/ID), facial dysmorphism, epileptic seizures, nonepileptic movement disorders, and ophthalmological problems.

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Recent advances in mobile health have enabled health data collection, which includes seizure and medication tracking and epilepsy self-management. We developed a mobile epilepsy management application, integrated with a hospital electronic health record (EHR). In this prospective clinical trial, we assessed whether the mobile application provides quality healthcare data compared to conventional clinic visits, and enhances epilepsy self-management for patients with epilepsy.

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Objective: Autosomal dominant (AD) guanosine triphosphate cyclohydrolase 1 (GCH1) deficiency is the most common cause of dopa-responsive dystonia (DRD). Patients with GCH1 deficiency are likely to experience diagnostic delay, but its consequences have not been described thoroughly in patients with early-onset disease. We describe the diagnostic delay and residual motor signs (RMS) observed in patients with early-onset (before 15 years of age) disease.

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Article Synopsis
  • * A 5-minute preictal period and data from just four electrodes resulted in the best classification performance, significantly outperforming longer preictal periods and using all available electrodes.
  • * While individual patient responses varied, overall improvements in prediction accuracy were minimal when adjusting the number of electrodes and sampling frequency, demonstrating that efficient monitoring can be achieved with fewer resources.
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Background And Purpose: The myelin oligodendrocyte glycoprotein (MOG) antibody is detected at a high rate in childhood acquired demyelinating syndrome (ADS). This study aimed to determine the diagnostic value of the MOG antibody in ADS and the spectrum of MOG-antibody-positive demyelinating diseases in children.

Methods: This study included 128 patients diagnosed with ADS (=94) or unexplained encephalitis (=34).

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Article Synopsis
  • The pilot study aimed to analyze treatment pathways for pediatric epilepsy using the common data model (CDM) based on electronic health record (EHR) data, assessing the feasibility of this approach for epilepsy research.
  • Researchers focused on patients who had been on antiseizure medication (ASM) treatment for at least two years and identified 313 different treatment pathways among 1,192 patients.
  • Results showed a significant drug resistance rate of 23.8%, with variations in resistance based on the type of epilepsy and age of onset, highlighting the complexity and individualized nature of epilepsy treatment.
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Purpose: Literature regarding family stigma related to epilepsy is scarce. This study investigated the prevalence of family stigma and depressive symptoms and the associated factors among the family members of patients with epilepsy.

Methods: In a cross-sectional study, Stigma Scale-Revised score ≥ 4 and Patient Health Questionnaire-9 score ≥ 10 were considered indicative of moderate-to-severe stigma and depressive symptoms, respectively.

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Improving the content and production of high-value ketocarotenoid pigments is critical for the commercialization of microalgal biorefineries. This study reported the use of magnesium aminoclay (MgAC) nanoparticles for enhancement of astaxanthin production by Haematococcus pluvialis in photoautotrophic cultures. Addition of 1.

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