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Jeong Ji-rang

Sungkyunkwan University · Medicine

About the Lab

Professor Jeong Ji-rang's research lab focuses on critical care medicine, with a primary emphasis on sepsis, delirium, and intensive care unit (ICU) outcomes in critically ill patients. The lab investigates biomarkers such as procalcitonin and C-reactive protein for early sepsis detection and prognosis, explores the psychological and cognitive sequelae of ICU stays, and examines the impact of clinical interventions—like early enteral nutrition, vitamin C, and thiamine—on patient recovery. The lab also employs electronic health record data to develop predictive models for ICU delirium, aiming to improve early detection and patient-centered care.

sepsisICU deliriumcritical carebiomarkerspredictive modeling

Research Overview

Papers
248
Total Citations
4,700
Papers (5y)
54
Primary Field
Medicine

Research Output Trend

Figures are computed from collected data and may differ slightly.

Publications per year (5y)
54total
2022
2023
2024
2025
2026
Citations per year (5y)
544total
20222023202420252026

Selected Papers

15
1
Article|88 citations·2015
Clinical Usefulness of Procalcitonin and C-Reactive Protein as Outcome Predictors in Critically Ill Patients with Severe Sepsis and Septic Shock
Jeong-Am Ryu, Jeong Hoon Yang, Dae-Sang Lee, Chi-Min Park, Gee Young Suh, Kyeongman Jeon, Joongbum Cho, Sun Young Baek, Keumhee C. Carrière, Chi Ryang Chung
SJR Q1PLoS ONEOA

Sepsis is a major cause of mortality and morbidity in critically ill patients. Procalcitonin (PCT) and C-reactive protein (CRP) are the most frequently used biomarkers in sepsis. We investigated changes in PCT and CRP concentrations in critically ill patients with sepsis to determine which biochemical marker better predicts outcome. We retrospectively analyzed 171 episodes in 157 patients with severe sepsis and septic shock who were admitted to the Samsung Medical Center intensive care unit from

EpidemiologyMedicine
2
Article|47 citations·2017
Cognitive Impairment and Psychological Distress at Discharge from Intensive Care Unit
Chi Ryang Chung, Hye Jin Yoo, Jinkyeong Park, Seunghyong Ryu
SJR Q2Psychiatry InvestigationOA

This study aimed to investigate cognitive impairment and psychological distress of critically ill patients at discharge from intensive care unit (ICU). This study included 30 critically ill patients who had neither pre-existing dementia nor ongoing delirium. At ICU discharge, they performed a screening test for cognitive impairment (Mini-Cog test) and completed questionnaires for depression (Patient Health Questionnaire-2, PHQ-2) and for 4 stressful experiences during ICU stay including nightmar

Critical Care and Intensive Care MedicineMedicine
3
Article|44 citations·2015
Safety profile and feasibility of early physical therapy and mobility for critically ill patients in the medical intensive care unit: Beginning experiences in Korea
Hyun Lee, Young Jun Ko, Gee Young Suh, Jeong Hoon Yang, Chi-Min Park, Kyeongman Jeon, Yun Hee Park, Chi Ryang Chung
SJR Q1Journal of Critical Care
Critical Care and Intensive Care MedicineMedicine
4
Article|42 citations·2020
The effect of bed-to-nurse ratio on hospital mortality of critically ill children on mechanical ventilation: a nationwide population-based study
Minyoung Jung, Hye‐Jeong Park, Danbee Kang, Esther Park, Kyeongman Jeon, Chi Ryang Chung, Jeong Hoon Yang, Gee Young Suh, Eliseo Güallar, Juhee Cho, Joongbum Cho
SJR Q1Annals of Intensive CareOA

BACKGROUND: Despite the high workload of mechanical ventilation, there has been a lack of studies on the association between nurse workforce and mortality in mechanically ventilated patients. We evaluated the association of the bed-to-nurse ratio with mortality in ventilated pediatric patients admitted to an intensive care unit (ICU). METHODS: We conducted a nationwide retrospective analysis by using the Korean National Health Insurance database, which categorizes the bed-to-nurse ratio into 9 g

EpidemiologyMedicine
5
Article|35 citations·2021
A Machine Learning–Based Algorithm for the Prediction of Intensive Care Unit Delirium (PRIDE): Retrospective Study
Sujeong Hur, Ryoung‐Eun Ko, Junsang Yoo, Juhyung Ha, Won Chul, Chi Ryang Chung
SJR Q1JMIR Medical InformaticsOA

BACKGROUND: Delirium frequently occurs among patients admitted to the intensive care unit (ICU). There is limited evidence to support interventions to treat or resolve delirium in patients who have already developed delirium. Therefore, the early recognition and prevention of delirium are important in the management of critically ill patients. OBJECTIVE: This study aims to develop and validate a delirium prediction model within 24 hours of admission to the ICU using electronic health record data

Critical Care and Intensive Care MedicineMedicine
6
Review|29 citations·2023
The Effectiveness of Early Enteral Nutrition on Clinical Outcomes in Critically Ill Sepsis Patients: A Systematic Review
Sun Jae Moon, Ryoung‐Eun Ko, Chi-Min Park, Gee Young Suh, Jinseub Hwang, Chi Ryang Chung
SJR Q1NutrientsOA

The optimal timing of enteral nutrition (EN) in sepsis patients is controversial among societal guidelines. We aimed to evaluate the evidence of early EN's impact on critically ill sepsis patients' clinical outcomes. We searched the MEDLINE, Embase, CINAHL, Cochrane Library, ClinicalTrials.gov, and ICTRP databases on 10 March 2023. We included studies published after 2004 that compared early EN versus delayed EN in sepsis patients. We included randomized controlled trials (RCTs), non-RCTs, cohor

Nutrition and DieteticsNursing
7
Article|22 citations·2020
Impact of Vitamin C and Thiamine Administration on Delirium-Free Days in Patients with Septic Shock
Jong Eun Park, Tae Gun Shin, Ik Joon Jo, Kyeongman Jeon, Gee Young Suh, Minsu Park, Hojeong Won, Chi Ryang Chung, Sung Yeon Hwang
SJR Q1Journal of Clinical MedicineOA

Sepsis is a common cause of delirium in the intensive care unit (ICU). Recently, vitamin C and thiamine administration has been gaining interest as a potential adjunct therapy for sepsis. We investigated the impact of early vitamin C and thiamine administration on ICU delirium-free days among critically ill patients in septic shock. We performed a single-center, retrospective study of patients who visited the emergency department (ED) from January 2017 to July 2018. We categorized patients into

Critical Care and Intensive Care MedicineMedicine
8
Article|21 citations·2015
Prolonged Maintenance of VV ECMO for 104 Days with Native Lung Recovery in Acute Respiratory Failure
Seong Mi Moon, Hyun Lee, Ji Hoon Moon, Hee-Kyung Kim, Jee Eun Park, Seonggyu Byeon, Gee Young Suh, Chi Ryang Chung
SJR Q1ASAIO Journal

Recently, extracorporeal membrane oxygenation (ECMO) support has been increasingly applied in acute respiratory failure. The ECMO brings some advantages for enhancing the capacity of lung regeneration. Thus, the timing of determining irreversibility of the injured lung could be delayed. In this study, we experienced a case of prolonged maintenance of veno-venous ECMO for 104 days that resulted in native lung recovery. In this case, the initial empirical treatment showed no response within 4 week

Biomedical EngineeringEngineering
9
Article|18 citations·2022
Association between the presence of delirium during intensive care unit admission and cognitive impairment or psychiatric problems: the Korean ICU National Data Study
Ryoung‐Eun Ko, Danbee Kang, Hye-Jung Park, Juhee Cho, Gee Young Suh, Chi Ryang Chung
SJR Q1Journal of Intensive CareOA

OBJECTIVE: Delirium in the intensive care unit (ICU) may be a preventable risk factor for cognitive impairment or psychiatric problems. We aimed to evaluate the association between the presence of delirium during hospitalization involving ICU care and post-discharge cognitive impairment or psychiatric problems. DESIGN: A retrospective cohort study. SETTING: A database of nationwide insurance claims data. PATIENTS: All adult patients aged 18 years or older who were admitted to an ICU between Janu

Critical Care and Intensive Care MedicineMedicine
10
letter|14 citations·2011
Pulmonary Coccidioidomycosis with Peritoneal Involvement Mimicking Lung Cancer with Peritoneal Carcinomatosis
Chi Ryang Chung, Yong Chul Lee, Yang Keun Rhee, Myoung Ja Chung, Yun Kyung Hong, Eui Yong Kweon, Seoung Ju Park
SJR Q1American Journal of Respiratory and Critical Care Medicine
EpidemiologyMedicine
11
Article|10 citations·2022
Safety and feasibility of continuous ketamine infusion for analgosedation in medical and cardiac ICU patients who received mechanical ventilation support: A retrospective cohort study
Hohyung Jung, Ji Hye Lee, Hyun Young Ahn, Jeong Hoon Yang, Gee Young Suh, Ryoung‐Eun Ko, Chi Ryang Chung
SJR Q1PLoS ONEOA

PURPOSE: To assess the effect of continuous ketamine administration in patients admitted to medical and cardiac intensive care units (ICUs) and received mechanical ventilation support. METHODS: We conducted a retrospective cohort study between March 2012 and June 2020 at an academy-affiliated tertiary hospital. Adult patients who received mechanical ventilation support for over 24 h and continuous ketamine infusion for at least 8 h were included. The primary outcome was immediate hemodynamic saf

Critical Care and Intensive Care MedicineMedicine
12
Article|8 citations·2021
Noninvasive Beat-To-Beat Stroke Volume Measurements to Determine Preload Responsiveness During Mini-Fluid Challenge in a Swine Model: A Preliminary Study
Ryoung‐Eun Ko, Geuk Young Jang, Chi Ryang Chung, Jin Young Lee, Tong In Oh, Gee Young Suh, Yong Min Kim, Eung Je Woo
SJR Q1Shock

ABSTRACT: Cardiac output (CO) is an important parameter in fluid management decisions for treating hemodynamically unstable patients in intensive care unit. The gold standard for CO measurements is the thermodilution method, which is an invasive procedure with intermittent results. Recently, electrical impedance tomography (EIT) has emerged as a new method for noninvasive measurements of stroke volume (SV). The objectives of this paper are to compare EIT with an invasive pulse contour analysis (

SurgeryMedicine
13
Article|6 citations·2021
Reliability and validity of the Korean version of the Functional Status Score for the ICU after translation and cross-cultural adaptation
Jong Geol, Gee Young Suh, Yu Hui Won, Won Hyuk Chang, Stephanie Hiser, Dale M. Needham, Chi Ryang Chung
SJR Q1Disability and Rehabilitation

The Korean version of the FSS-ICU showed excellent intra-rater and inter-rater reliability, internal consistency, and construct validity for medical ICU patients. The results of this study, along with prior publications, support that the FSS-ICU Korean version is a valid and reliable assessment tool for the ICU environment.Implications for rehabilitationIntensive care unit patients usually experience decreased muscle strength and physical function.The Korean version of the Functional Status Scor

Critical Care and Intensive Care MedicineMedicine
14
Article|6 citations·2024
Comparison of noninvasive cardiac output and stroke volume measurements using electrical impedance tomography with invasive methods in a swine model
Chi Ryang Chung, Ryoung‐Eun Ko, Geuk Young Jang, Kyounghun Lee, Gee Young Suh, Yong Min Kim, Eung Je Woo
SJR Q1Scientific ReportsOA

Abstract Pulmonary artery catheterization (PAC) has been used as a clinical standard for cardiac output (CO) measurements on humans. On animals, however, an ultrasonic flow sensor (UFS) placed around the ascending aorta or pulmonary artery can measure CO and stroke volume (SV) more accurately. The objective of this paper is to compare CO and SV measurements using a noninvasive electrical impedance tomography (EIT) device and three invasive devices using UFS, PAC-CCO (continuous CO) and arterial

SurgeryMedicine
15
Article|4 citations·2015
Purpura fulminans on the nose with septic abortion
Seong Mi Moon, Yun Soo Hong, Dae Sang Lee, Chi Ryang Chung
SJR Q1Intensive Care MedicineOA
SurgeryMedicine

Research Areas

Biomedical EngineeringCritical Care and Intensive Care MedicineEpidemiologyPulmonary and Respiratory MedicineInfectious DiseasesEmergency Medicine

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