Publications by authors named "Hak-Jae Lee"

Purpose: Target-controlled infusion (TCI) could provide a patient-tailored approach for vancomycin dosing. This study aimed to externally evaluate the predictive performance of a previously constructed pharmacokinetic model of vancomycin (Choi model) specifically optimized for TCI administration of vancomycin differing from the existing model, and to assess the feasibility of administering vancomycin via TCI in clinical practice. Additionally, clinical outcomes were exploratively compared between the TCI and intermittent infusion (standard) methods for vancomycin administration.

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Background: In emergency general surgery (EGS), rapid judgement and prompt emergency surgery play a significant role in determining the patient's prognosis. This study aimed to evaluate whether implementing the acute care surgery (ACS) system in Korea has improved the clinical outcomes of patients.

Methods: This retrospective cohort study was conducted at three tertiary hospitals in Korea.

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  • * A study tested the hypothesis that probiotic supplementation could restore gut microbiota dysbiosis caused by T. gondii in mice, demonstrating a significant reduction in infection levels and alterations in gut microbiota after treatment.
  • * Probiotics increased the abundance of beneficial gut bacteria and activated pathways for short-chain fatty acid production, which may help control T. gondii infections and enhance gut health, paving the way for future research.
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Purpose: Over the past 3 years, approximately 23,000 emergency surgeries were performed annually in South Korea, accounting for >1% of all surgeries nationwide. With the growing necessity for treating these emergency cases with dedication and proficiency, acute care surgery (ACS) teams were appointed at various hospitals. Regarding the implications of the ACS team, many studies showed promising results with a shorter time from the emergency department (ED) to the operating room (OR), shorter length of stay, and fewer complications.

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  • This study compared resting energy expenditure (REE) measured through indirect calorimetry to estimates from predictive equations in severe trauma patients to assess caloric needs.
  • A total of 27 patients had their REE measured, finding that weight-based and Penn State 2003 equations provided the closest estimates, while Harris-Benedict and Ireton-Jones equations significantly differed from measured values.
  • The findings suggest a crucial need for direct measurement of REE in severe trauma patients rather than relying on predictive equations, as the latter showed a 36.2% concordance rate with measured values.
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  • - Successful liberation from mechanical ventilation is essential for patients recovering from respiratory failure, marking their transition out of intensive care and towards normal life.
  • - A thorough review of existing studies using the GRADE method resulted in evidence-based recommendations for clinicians, focusing on when patients are ready to breathe independently.
  • - The guidelines include nine key questions about ventilator liberation, offering seven conditional recommendations, one expert consensus, and one deferred recommendation to improve patient outcomes.
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  • Successful liberation from mechanical ventilation is crucial for patients transitioning out of intensive care, and both individual healthcare experiences and systematic methods are important for this process.
  • The Korean Society of Critical Care Medicine reviewed numerous studies using meta-analyses to create evidence-based recommendations for clinicians on how to determine when patients are ready to breathe on their own.
  • The guidelines include recommendations on nine specific questions related to ventilator liberation, comprising seven conditional recommendations, one expert consensus, and one conditional deferred recommendation, aimed at optimizing patient care.
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Background: Delirium occurs at high rates among patients in intensive care units and increases the risk of morbidity and mortality. The purpose of this study was to investigate the effects of environmental interventions on delirium.

Methods: This prospective cohort study enrolled 192 patients admitted to the surgical intensive care unit (SICU) during the pre-intervention (June 2013 to October 2013) and post-intervention (June 2014 to October 2014) periods.

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  • A nationwide study in Korea was conducted to compare laparoscopic emergency surgery (LES) with open abdominal emergency surgery (OES), analyzing data from 2,122 patients across three hospitals from 2014 to 2019.
  • The results showed that 60.3% of patients underwent OES, with the small bowel being the most commonly operated organ, while the appendix was most common for LES, particularly in appendectomies (93.7% LES) and cholecystectomies (88.0% LES).
  • The study found that while LES practices in Korea are similar to global trends for some surgeries, differences exist in gastric and colorectal surgeries, highlighting the need for further research to understand these vari
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Purpose: One of the rare life-threatening fungal infections is pneumocystis pneumonia (PCP). Immunocompromised patients are the main vulnerable population. We investigate the risk factors associated with the development of severe PCP infection with acute respiratory failure after kidney transplantation.

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Background: Sepsis is the most common cause of death in hospitals, and intra-abdominal infection (IAI) accounts for a large portion of the causes of sepsis. We investigated the clinical outcomes and factors influencing mortality of patients with sepsis due to IAI.

Methods: This post-hoc analysis of a prospective cohort study included 2126 patients with sepsis who visited 16 tertiary care hospitals in Korea (September 2019-February 2020).

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Background: Vitamin D deficiency is common in patients with chronic liver disease and is associated with increased risk of infection and mortality. This study evaluated the effects of preoperative vitamin D levels on clinical outcomes after liver transplant.

Methods: This single-center retrospective study included liver transplant recipients from June to November 2017 who had preoperative 25-OH-vitamin D3 (25-OH-D3) data.

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We revised and expanded the "2010 Guideline for the Use of Sedatives and Analgesics in the Adult Intensive Care Unit (ICU)." We revised the 2010 Guideline based mainly on the 2018 "Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption (PADIS) in Adult Patients in the ICU," which was an updated 2013 pain, agitation, and delirium guideline with the inclusion of two additional topics (rehabilitation/mobility and sleep). Since it was not possible to hold face-to-face meetings of panels due to the coronavirus disease 2019 (COVID-19) pandemic, all discussions took place via virtual conference platforms and e-mail with the participation of all panelists.

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The aim of this prospective study was to construct a new pharmacokinetic model of vancomycin for target-concentration controlled infusion (TCI). As the first loading dose, 25 mg/kg of vancomycin was administered during 60-90 min. Arterial blood samples were obtained at pre-set intervals to measure the serum concentrations of vancomycin.

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Background: The acute care surgery (ACS) system is a new model for the prompt management of diseases that require rapid treatment in patients with acute abdomen. This study compared the outcomes and characteristics of the ACS system and traditional on-call system (TROS) for acute appendicitis in South Korea.

Methods: This single-center, retrospective study included all patients (aged ≥18 years) who underwent surgery for acute appendicitis in 2016 and 2018.

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Background: Although early identification of critical illness polyneuropathy (CIP) is necessary, the established diagnostic criteria have several limitations in the intensive care unit (ICU) setting. The purpose of this study was to define simplified diagnostic criteria of CIP that best predict clinical outcomes.

Methods: This prospective, single-center study included 41 ICU patients with prolonged mechanical ventilation (≥21 days).

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  • - The study aimed to compare four predictive equations for estimating energy expenditure in liver transplant recipients against direct measurements taken via indirect calorimetry.
  • - Conducted in a South Korean surgical ICU, the research involved 46 patients, finding that the Penn State equation provided the best agreement (65%) with measured energy needs, while other equations showed lower accuracy.
  • - The results indicated that all predictive equations had fixed biases and were generally inaccurate, suggesting the necessity of using indirect calorimetry for precise measurement of metabolic needs in liver transplant patients.
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Background: Bacteremia is a major nosocomial infection that frequently occurs in trauma patients, increasing morbidity and mortality. The aim of this study was to identify risk factors and to describe epidemiological patterns for early onset (EOB) and late onset (LOB) bacteremia after trauma.

Methods: We retrospectively reviewed medical records of all trauma patients admitted to the surgical intensive care unit and general ward between January 2011 and December 2015.

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Purpose: Unstable pelvic fracture with bleeding can be fatal, with a mortality rate of up to 40%. Therefore, early detection and treatment are important in unstable pelvic trauma. We investigated the early predictive factors for possible embolization in patients with hemodynamically unstable pelvic trauma.

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An anti-malarial candidate, 6-(1,2,6,7-tetraoxaspiro[7.11]nonadec-4-yl)hexan-1-ol (N-251), was studied to characterize its potential as a novel anti-Toxoplasma gondii drug. In the present study, IC50 and LC50 of N-251 on host cells and T.

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This work reports the capability of depth profile analysis of thin CuIn1-xGa(x)Se2 (CIGS) absorber layer (1.89 μm) with a sub-hundred nanometer resolution by laser induced breakdown spectroscopy (LIBS). The LIBS analysis was carried out with a commercial CIGS solar cell on flexible substrate by using a pulsed Nd:YAG laser (λ = 532 nm, τ = 5 ns, top-hat profile) and an intensified charge-coupled device spectrometer in atmospheric conditions.

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