Publications by authors named "Byung Woo Yoon"

Background: Post-stroke dementia (PSD) is a common and disabling sequela of stroke. However, the long-term incidence of PSD after an ischemic stroke and factors which predict its occurrence are incompletely understood. Linkage of large health datasets is being increasing used to study long term outcomes after disease.

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Background: We aimed to evaluate long-term outcomes of gamma knife radiosurgery (GKS) for cerebral cavernous malformations (CCMs).

Methods: Among the 233 CCM patients who underwent GKS, 79 adult patients (96 lesions) followed for over 10 years were included and analyzed retrospectively. Annual hemorrhage rate (AHR) was analyzed the entire cohort of 233 patients and the subset of 79 enrolled patients by dividing lesions into overall CCM lesions and brainstem lesions.

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  • * Researchers analyzed data from over 42,000 patients, identifying key variables like age, sex, and health conditions that affect long-term survival.
  • * A predictive tool named SMART-M was developed, showing strong performance with C-statistics of approximately 0.806 for the training group and 0.803 for the validation group, indicating its reliability in mortality prediction.
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  • * Results indicated that obliteration rates improved with higher doses for AVMs between 10-30 mL and required multiple GKS sessions, while AVMs over 30 mL showed no improvement with the first treatment.
  • * The complication rate was manageable, with an overall obliteration rate of 61.5% and significant factors affecting outcomes including AVM volume and radiation dose.
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Background: Late hospital arrival keeps patients with stroke from receiving recanalization therapy and is associated with poor outcomes. This study used a nationwide acute stroke registry to investigate the trends and regional disparities in prehospital delay and analyze the significant factors associated with late arrivals.

Methods: Patients with acute ischemic stroke or transient ischemic attack between January 2012 and December 2021 were included.

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Researchers have proposed a possible correlation between age-related macular degeneration (AMD) and inflammation or C-reactive protein (CRP) levels. We investigated the potential causal relationship between CRP levels and AMD. Single-nucleotide polymorphisms (SNPs) associated with CRP exposure were selected as the instrumental variables (IVs) with significance ( < 5 × 10) from the genome-wide association study (GWAS) meta-analysis data of Biobank Japan and the UK Biobank.

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Article Synopsis
  • - Statin therapy is effective in reducing cardiovascular events like recurrent ischemic stroke, even though it poses a risk for developing new-onset diabetes mellitus (NODM) in patients post-stroke.
  • - A study involving 20,250 patients showed that 67.7% were prescribed statins after an ischemic stroke, and those on statins had a significantly higher risk of NODM, especially after 3 years.
  • - Despite the increased risk of NODM linked to statin use, the therapy notably decreased the risk of recurrent ischemic strokes by 54% in these patients, highlighting a complex balance between benefits and risks.
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Aim: While the relationship between impaired kidney function and non-vitamin K antagonist oral anticoagulants (NOACs) is well established, there is limited research exploring the association between an elevated estimated glomerular filtration rate (eGFR) and the efficacy of NOACs, especially concerning the outcomes of acute ischemic stroke (AIS). This study aimed to examine the association between higher-than-normal eGFR and the severity of AIS during the use of NOACs using a nationwide multicenter stroke registry in Korea.

Material And Methods: This study utilized data from the Korean Stroke Registry (KSR) database, examining information from 2,379 patients with AIS, who had atrial fibrillation (AF) and a history of utilizing NOACs prior to hospitalization due to incident stroke occurring between 2016 and 2021.

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Background: People with factor XI deficiency have lower rates of ischaemic stroke than the general population and infrequent spontaneous bleeding, suggesting that factor XI has a more important role in thrombosis than in haemostasis. Milvexian, an oral small-molecule inhibitor of activated factor XI, added to standard antiplatelet therapy, might reduce the risk of non-cardioembolic ischaemic stroke without increasing the risk of bleeding. We aimed to estimate the dose-response of milvexian for recurrent ischaemic cerebral events and major bleeding in patients with recent ischaemic stroke or transient ischaemic attack (TIA).

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Background: Since the long-term outcomes of 162 patients who underwent gamma knife radiosurgery (GKS) as an initial or adjuvant treatment for acoustic neuromas (ANs) with unilateral hearing loss were first reported in 1998, there has been no report of a comprehensive analysis of what has changed in GKS practice.

Methods: We performed a retrospective study of the long-term outcomes of 106 patients with unilateral sporadic ANs who underwent GKS as an initial treatment. The mean patient age was 50 years, and the mean initial tumor volume was 3.

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Background: Optimal antiplatelet strategy for patients with ischemic stroke who were already on single antiplatelet therapy (SAPT) remains to be elucidated. This study aimed to evaluate the effect of different antiplatelet regimens on vascular and safety outcomes at 1 year after non-cardioembolic stroke in patients previously on SAPT.

Methods: We identified 9,284 patients with acute non-cardioembolic ischemic stroke that occurred on SAPT using linked data.

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Objective: There is growing interest in the use of new biomarkers such as glycated albumin (GA). In contrast to glycated hemoglobin (HbA1c), GA showed an inverse correlation with prestroke obesity status, but data are limited for ischemic stroke (IS).

Materials And Methods: We explored the association between GA and body mass index (BMI) and investigated inflammatory cytokines to support the academic background.

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  • The study investigates the impact of clonal hematopoiesis of indeterminate potential (CHIP) on patients experiencing acute ischemic stroke (AIS), comparing them with healthy individuals.
  • Results show that CHIP was more prevalent in AIS patients (29%) compared to healthy controls (22%), with specific gene mutations like PPM1D linked to higher stroke odds.
  • The presence of CHIP correlated with greater stroke severity, increased risk of hemorrhagic transformation, and worse functional outcomes 90 days post-stroke.
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Gastric cancer (GC) usually metastasizes to locoregional lymph nodes, the peritoneum causing ascites, or to the liver and lungs but rarely to the brain. Few cases of brain-only GC metastases have been reported, and the prognosis is very poor. We present a case of brain-only metastasis 2 years after curative GC surgery and chemotherapy, who visited the ER due to a headache.

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Metastases to the thyroid area are extremely rare in cancer, more specifically, in gastric cancer, where intraperitoneal metastases are absent. Herein, we describe a case of a 41-year-old man who had advanced gastric cancer with metastasis to the right thyroid area, which was found 6 years after curative surgery. The patient presented with multiple enlarged right cervical lymph nodes and a right thyroid mass of 1.

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Background And Purpose: Ischemic stroke is a heterogeneous disease with various etiologies. The current subtyping process is complicated, time-consuming, and costly. Metabolite-based biomarkers have the potential to improve classification and deliver optimal treatments.

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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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Proton pump inhibitors (PPIs) are widely used for the treatment of gastrointestinal diseases. However, recent studies have shown that chronic PPI use is associated with the progression of endothelial senescence and cerebrovascular diseases. We hypothesized that PPI users might be vulnerable to fast progression of cerebral small vessel disease (SVD) with cumulative effects.

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The incidence of prostate cancer (PCa) varies by ethnicity. This study aimed to provide insights into the genetic cause of PCa, which can result in differences in incidence among individuals of diverse ancestry. We collected data on PCa-associated single-nucleotide polymorphisms (SNPs) from a genome-wide association study catalog.

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Dyslipidemia is an important independent risk factor for cardiovascular disease (CVD). Specifically, apolipoprotein A1 (ApoA1), apolipoprotein B (ApoB), and the ApoB/A1 ratio have been linked to CVD. We conducted a genome-wide association study meta-analysis of two Korean cohorts containing a total of 12,924 patients to identify novel single nucleotide polymorphisms (SNPs) associated with ApoA1 and ApoB levels and the ApoB/A1 ratio.

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  • Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is an effective treatment for severe Parkinson's disease (PD), with this study focusing on its long-term outcomes and survival rates.
  • Out of 81 patients (both male and female) who underwent bilateral STN DBS, 43% died during a median follow-up of 145 months, with cumulative survival rates of 98.8% at 1 year, 95.1% at 5 years, and 79.0% at 10 years.
  • The study found significant improvements in PD symptoms up to 5 years post-surgery, with a notable number of patients remaining ambulatory for over 11 years, indicating
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