Publications by authors named "Youjin Chang"

Background: The Adult Sepsis Event (ASE) criteria, developed by the US. Centers for Disease Control and Prevention (CDC), utilize electronic Sequential Organ Failure Assessment (eSOFA) scores derived from structured electronic health records to retrospectively detect organ dysfunction in patients with suspected sepsis. While validated primarily in inpatient cohorts, their applicability in emergency department (ED) populations remains uncertain.

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Background: Sepsis is a leading cause of intensive care unit (ICU) admission. However, few studies have evaluated how the ICU model affects the outcomes of patients with sepsis.

Methods: This post hoc analysis of data from the Management of Severe Sepsis in Asia's Intensive Care Units II study included 537 patients with sepsis admitted to 27 ICUs in Korea.

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Background: There is no gold standard tool for nutritional assessment in critically ill patients. The modified Nutrition Risk in Critically Ill (mNUTRIC) score assesses risk of future malnutrition, whereas the Global Leadership Initiative on Malnutrition (GLIM) criteria diagnose only current malnutrition.

Objectives: We aimed to evaluate the prognostic performance of a novel nutritional assessment tool that combines the mNUTRIC score and GLIM criteria for hospital outcomes among intensive care unit (ICU) patients.

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High-flow nasal cannula (HFNC) is a noninvasive respiratory support system that delivers air that is heated at 31°C-38°C, humidified 100%, and oxygen-enriched at a constant high flow rate of 15-60 L/min. Because of its numerous physiological benefits, convenience, and minimal side effects, HFNC has been increasingly used over the past decade in patients with acute hypoxemic respiratory failure, yet the clinical benefits of long-term HFNC remain uncertain. Several studies have suggested its potential use as an alternative home oxygen therapy for patients with chronic stable lung diseases, such as chronic obstructive pulmonary disease (COPD), interstitial lung disease, and bronchiectasis.

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Purpose: To determine effects of colonization with multidrug-resistant bacteria (MDRB) in general wards on characteristics, treatment, and prognosis of hospital-acquired pneumonia (HAP).

Methods: This was a multicenter retrospective cohort study of patients with HAP admitted to 16 tertiary or university hospitals in Korea from July 2019 to December 2019. From the entire cohort, patients who developed pneumonia in general wards with known colonization status before the onset of pneumonia were included in this study.

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Background: Despite recent advances and global improvements in sepsis recognition and supportive care, mortality rates remain high, and adherence to sepsis bundle components in Korea is low. To address this, the Korean Sepsis Alliance, affiliated with the Korean Society of Critical Care Medicine, developed the first sepsis treatment guidelines for Korea based on a comprehensive systematic review and meta-analysis.

Methods: A de novo method was used to develop the guidelines.

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Background: The distinction between culture-positive sepsis and culture-negative sepsis regarding clinical characteristics and outcomes remains contentious. We aimed to elucidate these differences using large-scale nationwide data.

Methods: This prospective cohort study analyzed data from the Korean Sepsis Alliance registry, comprising 21 intensive care units (ICUs) across 20 hospitals from September 2019 to December 2021.

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Article Synopsis
  • Hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP) lead to significant health issues and high mortality rates, yet Korea lacks specific guidelines for their treatment.
  • A committee of nine experts utilized local epidemiological data to address 11 critical questions related to diagnosing and treating HAP/VAP, employing the CORE process for developing recommendations.
  • The resulting guidelines provide tailored suggestions for adult patients in Korea, focusing on diagnosis, biomarkers, antibiotics, and treatment strategies.
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Article Synopsis
  • - 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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An evaluation of the persistence of symptoms following COVID-19 in economically active young and middle-aged adults is crucial due to its significant socioeconomic impact resulting from compromised work performance. A prospective, multicenter study at 12 South Korean hospitals from January to December 2022 involved telephone interviews along with validated questionnaires. Among 696 participants with a median age of 32 and no prior diagnoses, 30% of participants experienced persistent fatigue, while 21.

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Article Synopsis
  • 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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Article Synopsis
  • The study aimed to assess whether using a combination of fluoroquinolone antibiotics reduces mortality in patients with hospital-acquired pneumonia (HAP) compared to β-lactam monotherapy.
  • It involved a retrospective analysis of 631 patients across 16 hospitals in Korea during 2019, with a focus on 30-day mortality rates.
  • Results indicated no significant difference in mortality between the combination therapy and monotherapy groups, suggesting that fluoroquinolone combinations may not provide additional survival benefits for HAP patients.
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Background: Although the Life-Sustaining Treatment (LST) Decision Act was enforced in 2018 in Korea, data on whether it is well established in actual clinical settings are limited. Hospital-acquired pneumonia (HAP) is a common nosocomial infection with high mortality. However, there are limited data on the end-of-life (EOL) decision of patients with HAP.

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Background: Acute respiratory distress syndrome (ARDS) is etiologically and clinically a heterogeneous disease. Its diagnostic characteristics and subtype classification, and the application of these features to treatment, have been of considerable interest. Metabolomics is becoming important for identifying ARDS biology and distinguishing its subtypes.

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Frailty is an important risk factor for adverse health-related outcomes. It is classified into several phenotypes according to nutritional state and physical activity. In this context, we investigated whether frailty phenotypes were related to clinical outcome of hospital-acquired pneumonia (HAP).

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Background/aims: Most studies on hospital-acquired pneumonia (HAP) have been conducted in intensive care unit (ICU) settings. This study aimed to investigate the microbiological and clinical characteristics of non-ICU-acquired pneumonia (NIAP) and to identify the factors affecting clinical outcomes in Korea.

Methods: This multicenter retrospective cohort study was conducted in patients admitted to 13 tertiary hospitals between July 1, 2019 and December 31, 2019.

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Background: It is essential to determine the distribution of the causative microorganisms in the region and the status of local antibiotic resistance for the proper treatment of hospital-acquired pneumonia/ventilator-associated pneumonia (HAP/VAP). This study aimed to investigate the occurrence and causative strains of HAP/VAP, distribution of resistant bacteria, use of antibiotics, and the ensuing outcomes of patients in Korea.

Methods: A multicenter prospective observational cohort study was conducted among patients with HAP/VAP admitted to the medical intensive care unit of 5 tertiary referral centers between August 2012 and June 2015.

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Background: It is important for intensivists to determine which patient may benefit from intensive care unit (ICU) admission. We aimed to assess the outcomes of patients perceived as non-beneficially or beneficially admitted to the ICU and evaluate whether their prognosis was consistent with the intensivists' perception.

Methods: A prospective observational study was conducted on patients admitted to the medical ICU of a tertiary referral center between February and April 2014.

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Background: Patients with intermediate-risk pulmonary embolism (PE) can be treated with anticoagulation monotherapy. However, clinicians are concerned as to whether anticoagulation monotherapy is sufficient to reduce mortality in patients with a large embolic burden, and to resolve vascular obstruction. We investigated whether anticoagulation monotherapy was appropriate in patients with intermediate risk PE in terms of the occurrence of residual pulmonary vascular obstruction (RPVO), and the factors that independently predict the occurrence of RPVO.

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Background: Hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP) are significant public health issues in the world, but the epidemiological data pertaining to HAP/VAP is limited in Korea. The objective of this study was to investigate the characteristics, management, and clinical outcomes of HAP/VAP in Korea.

Methods: This study is a multicenter retrospective cohort study.

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Background: The use of sedative drugs may be an important therapeutic intervention during noninvasive ventilation (NIV) in intensive care units (ICUs). The purpose of this study was to assess the current application of analgosedation in NIV and its impact on clinical outcomes in Korean ICUs.

Methods: Twenty Korean ICUs participated in the study, and data was collected on NIV use during the period between June 2017 and February 2018.

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Unlabelled: High-flow nasal cannula (HFNC) therapy has been established as a promising oxygen treatment with various advantages for respiratory mechanics. One of the main mechanisms is to provide positive airway pressure. This effect could reduce lung injury and improve oxygenation; conversely, it may cause a complication of positive pressure ventilation.

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Background: The demand for pediatric orthopaedic surgery consultation has grown rapidly, leading to longer wait times for elective consultation in some regions. Some specialties are addressing this increased demand through electronic consultation services. We wanted to examine the impact of pediatric orthopaedic e-consultations in Canada's Eastern Ontario region.

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