Publications by authors named "Seung Hyuk Yim"

Several donor-specific factors influence the functional recovery and long-term outcomes of liver grafts. This study investigated the association between donor fasting glucose (DFG) and recipient outcomes after living donor liver transplantation (LDLT) in 950 cases at a single center. Patients were divided into two groups: low-DFG (< 85 mg/dL, n = 120) and control (≥ 85 mg/dL, n = 830).

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Purpose: Autologous arteriovenous fistulas (AVFs) are considered the gold standard for hemodialysis access, with outcomes largely dependent on the surgeon's experience. Nevertheless, few studies have been conducted on the learning curve of junior vascular surgeons in AVF creation. This study aims to address this by examining the development of surgical skills among junior vascular surgeons.

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  • The study aimed to validate the SALT-M score in predicting 1-year post-liver transplantation mortality for patients with acute-on-chronic liver failure (ACLF) in an Asian cohort.
  • The results showed that SALT-M provided better predictability for post-transplant survival compared to traditional MELD scoring systems, with higher AUROC and c-index values.
  • The findings suggest that using the SALT-M score can effectively stratify the risk of mortality in ACLF patients, potentially guiding decisions on liver transplantation eligibility.
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  • * Patients with seizures have significantly lower five-year graft survival rates (50.6%) compared to those without (78.2%), and seizures increase the risk of graft loss by over double.
  • * Key risk factors for post-liver transplant seizures include low body mass index, older donor age, use of renal replacement therapy during surgery, and elevated sodium levels, suggesting that managing these factors could prevent seizures and improve transplant outcomes.
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  • Death with a functioning graft is a significant cause of graft loss in kidney transplant patients, but factors predicting it are not well understood.
  • This study analyzed the relationship between the creatinine-cystatin C ratio and mortality among 1,592 kidney transplant recipients, revealing that a low ratio increases the risk of death with a functioning graft.
  • In particular, those in the lowest ratio tertile had significantly lower survival rates, with infections being the leading cause of death in this group.
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Cardiovascular disease remains a leading cause of morbidity and mortality after kidney transplantation (KT). Although statins reduce cardiovascular risk and have renal benefits in the general population, their effects on KT recipients are not well-established. We studied the effects of early statin use (within 1-year post-transplantation) on long-term outcomes in 714 KT recipients from the Korean cohort study for outcome in patients with KT.

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Background: Bacterial infections are major complications that cause significant mortality and morbidity in living donor liver transplantation (LDLT). The risk of bacterial infection has not been studied in ABO-incompatible (ABOi) recipients with a desensitization protocol in relation to the number of plasma exchanges (PEs). Therefore, we aimed to analyze the risk of bacterial infection in ABOi LDLT recipients with a high number of PEs compared with recipients with a low number of PEs.

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Background: Graft-versus-host disease (GVHD) is a rare, but potentially fatal complication of liver transplantation. One-way human leukocyte antigens (HLA) mismatch has emerged as a risk factor for GVHD. However, the risk of mortality associated with HLA-one-way mismatch (OWMM) remains uncertain.

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The clinical effects of tacrolimus (TAC) exposure on hepatocellular carcinoma (HCC) recurrence after liver transplantation (LT) remain unclear. In this retrospective single centric study, 512 patients who underwent LT for HCC were divided into four groups according to cumulative exposure to tacrolimus (CET) during 3 months after LT: conventional (n = 218), aggressive minimization (n = 32), minimization (n = 161), and high exposure (n = 101). Impact of CET on HCC recurrence and death were analyzed.

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Background: The Living Kidney Donor Profile Index (LKDPI) was developed in the United States to predict graft outcomes based on donor characteristics. However, there are significant differences in donor demographics, access to transplantation, proportion of ABO incompatibility, and posttransplant mortality in Asian countries compared with the United States.

Methods: We evaluated the clinical relevance of the LKDPI score in a Korean kidney transplant cohort by analyzing 1860 patients who underwent kidney transplantation between 2000 and 2019.

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Purpose: Unusual grafts, including extended left liver plus caudate lobe, right anterior section, and right posterior section grafts, are alternatives to left and right lobe grafts for living-donor liver transplantation. This study aimed to investigate unusual grafts from the perspectives of recipients and donors.

Methods: From 2016 to 2021, 497 patients received living-donor liver transplantation at Severance Hospital.

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  • MELD3.0 is a new model for predicting mortality in patients waiting for liver transplants, designed to improve upon the existing MELD system, especially important in Korea where organ shortages are common.
  • A study compared the effectiveness of MELD and MELD3.0 in predicting 90-day mortality among 2,353 patients on a waitlist, showing that MELD3.0 outperformed the original model.
  • While MELD3.0 offered better predictions, particularly for women and patients with severe ascites, the overall improvement in reducing waitlist mortality was found to be limited in organ-scarce regions like Korea.
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  • LDLT can provide better one-year survival rates for patients with high MELD scores compared to waiting for deceased-donor liver transplantation (DDLT) in regions with organ shortages.
  • A study of 649 patients found that those who underwent LDLT had significantly lower mortality rates than those who were on the waitlist for DDLT.
  • While LDLT has higher surgical complication rates, the outcomes for living donors were generally positive, with no reported fatalities and minimal severe complications.
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Background: Statins have been reported to reduce overall death and hepatocellular carcinoma (HCC) recurrence in liver transplantation (LT) recipients. However, previous retrospective studies have significant flaws in immortal time bias.

Methods: Using data from 658 patients who received LT for HCC, we matched 140 statin users with statin nonusers in a 1:2 ratio at the time of the first statin administration after LT using the exposure density sampling (EDS).

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Cytomegalovirus (CMV), a common pathogen, causes infectious complications and affects long-term survival after transplantation. Studies examining living donor liver transplantation (LDLT) are limited. This study analyzed the risk factors for CMV infection and its impact on the survival of LDLT patients.

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Objectives: The risk factors for late-onset Pneumocystis jirovecii pneumonia (PCP) after liver transplantation (LT) have not been well studied. We aimed to analyze the clinical features preceding PCP in LT recipients that would guide individualized prophylaxis.

Methods: Among 742 patients who underwent LT and routine PCP prophylaxis from January 2009 through December 2019 at Severance Hospital, 27 patients developed PCP.

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Extracorporeal membrane oxygenation (ECMO) has emerged as an alternative treatment to conventional ventilation maneuvers in the nontransplantation literature to support acute respiratory distress syndrome. However, the role of ECMO in transplant is unclear, and few case reports have described using ECMO pretransplant. We discuss the successful use of veno-arteriovenous ECMO as a bridge therapy to deceased donor liver transplant (LT) in acute respiratory distress syndrome.

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Carbapenem-resistant Acinetobacter baumannii bacteremia (CRAB-B) is a fatal infectious complication of liver transplantation (LT). This study investigated the incidence, effects, and risk factors associated with CRAB-B during the early post-LT period. Among 1051 eligible LT recipients, 29 patients experienced CRAB-B within 30 days of LT with a cumulative incidence of 2.

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Malakoplakia is a rare, granulomatous disease that usually affects immunocompromised individuals and is generally associated with poor graft and patient survival. We present a case of renal malakoplakia after kidney transplantation (KT). A 33-year-old female patient with chronic kidney disease underwent living-donor KT at Severance Hospital.

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Recently, the 2015 American Thyroid Association (ATA) risk stratification and the 8 edition of the American Joint Committee on Cancer/Union for International Cancer Control (AJCC/UICC) TNM staging system were released. This study was conducted to assess the clinical value of the lymph node ratio (LNR) as a predictor of recurrence when integrated with these newly released stratification systems, and to compare the predictive accuracy of the modified systems with that of the newly released systems. The optimal LNR threshold value for predicting papillary thyroid cancer (PTC) recurrence was 0.

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Locally advanced thyroid cancer exhibits aggressive clinical features requiring extensive neck dissection. Therefore, it is important to identify changes in the tumor biology before local progression. Here, whole exome sequencing (WES) using tissues from locally advanced papillary thyroid cancer (PTC) presented a large number of single nucleotide variants (SNVs) in the metastatic lymph node (MLN), but not in normal tissues and primary tumors.

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Aim: To evaluate the preventive effect of finasteride on chronic bacterial prostatitis (CBP), Wistar rats were divided into four groups: control, ciprofloxacin, finasteride, and ciprofloxacin/finasteride.

Methods: All drug pretreatments were conducted for 4 weeks, and then experimental CBP was induced by instillation of a bacterial suspension (Escherichia coli Z17 O2:K1;H-).

Results: After 4 weeks, results of microbiological cultures of prostate and urine samples as well as histological findings of the prostate in each group were analyzed.

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