Young-Min Kim, Chan Woong Kim, Kyung Hye Park, Hyo Joon Kim, Kyung Jun Song, Sung Phil Chung, Dong Ryul Ko, Tae Han Kim, on behalf of KSEM Quality Improvement in Residency Training Committee
In Press, Received January 7, 2026 Accepted March 25, 2026 Available online April 8, 2026
Objective The study explores the long-term impacts of traumatic brain injury (TBI) on neuroinflammation and neuronal apoptosis in pediatric and adult mice, focusing on how age at injury influences these processes.
Methods Controlled cortical impacts were used to induce TBI in pediatric (21–25 days old) and adult (8–12 weeks old) C57BL/6 male mice. Neuroinflammation was evaluated by measuring immunoreactivity for allograft inflammatory factor 1 (AIF-1)/ionized calcium-binding adaptor molecule 1 (Iba-1) and glial fibrillary acidic protein (GFAP), while apoptosis was assessed using markers such as B-cell lymphoma 2 (Bcl-2)-associated X protein (Bax), Bcl-2, and procaspase-3. Additionally, heat shock protein 70 (HSP70) expression was measured to understand the stress response.
Results Following controlled cortical impacts, pediatric mice exhibited a significant reduction in expression of neuronal nuclei (P<0.001), and significant increases in expression of GFAP (P<0.01) and AIF-1/Iba-1 (P<0.05) at 3 days post-injury (DPI) compared with sham controls. In contrast, adult mice exhibited no significant change in AIF-1/Iba-1 expression and a less pronounced increase in GFAP (P<0.05) at 3 DPI compared with sham controls. A more significant increase in Bax/Bcl-2 ratio at 7 DPI (P<0.01) was seen in pediatric mice, while a weak but significant increase in Bax/Bcl-2 ratio at 7 DPI (P<0.05) was evident in adults. Both age groups showed a significant but transient increase in HSP70 levels at 7 DPI, which normalized by 90 DPI.
Conclusion Pediatric and adult mice exhibited significant time-dependent differences in neuroinflammation and apoptosis following TBI, with pediatric mice showing more intense early responses indicative of age-specific vulnerabilities in post-injury outcomes. Both age groups showed a significant but transient increase in HSP70 expression, suggesting an acute response to stress post-injury.
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Extracellular vesicles as biomarkers for traumatic brain injury using a 3D in vitro human brain tissue model Peter Hsi, Vishal Tandon, David L. Kaplan Scientific Reports.2025;[Epub] CrossRef
Objective Chronic stress in adolescence may affect brain maturation and predispose individuals to psychiatric disorders in adulthood. However, whether chronic juvenile stress influences vulnerability to nonpsychiatric brain injuries, such as traumatic brain injury (TBI), remains unclear. Therefore, we hypothesized that juvenile stress-related neuronal circuit disturbances could aggravate brain damage following TBI in adulthood.
Methods For chronic stress, we used an unpredictable chronic mild stress (UCMS) procedure for 5 weeks in adolescent mice. This was followed by a controlled cortical impact (CCI) injury to evaluate the influence of chronic juvenile stress on brain damage progression following TBI in adult mice. Mice underwent UCMS alone, UCMS followed by CCI, CCI alone, or sham operation. We characterized neurobehavioral deficits (Barnes maze, open field, and light-dark tests), neuroinflammation (ionized calcium-binding adapter molecule 1 [Iba-1], glial fibrillary acidic protein [GFAP], and neuron-specific nuclear protein [NeuN] immunoreactivity), and apoptosis (B-cell lymp [Bcl-2], Bcl-2-associated X protein [Bax], and procaspase-3 immunoreactivity).
Results Following CCI, mice exposed to UCMS showed decreased spatial learning and memory in the Barnes maze test compared with unstressed mice. A significant increase in Iba-1, GFAP, and Bax/Bcl-2 immunostaining levels was observed in the mice exposed to UCMS followed by CCI compared with the CCI-only mice. In contrast, a significant decrease in NeuN immunostaining levels was observed in the UCMS with CCI group compared with the CCI alone group.
Conclusion Chronic stress in a juvenile mouse model aggravates neurobehavioral impairments and potentiates glial reactivity, neuronal injury, and apoptosis following moderate-to-severe TBI that occurs in adulthood. The present study suggests that juvenile chronic stress may influence poor outcomes following TBI in later adulthood.
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Expert opinion on evidence after the 2020 Korean Cardiopulmonary Resuscitation Guidelines: a secondary publication Sung Phil Chung, Youdong Sohn, Jisook Lee, Youngsuk Cho, Kyoung-Chul Cha, Ju Sun Heo, Ai-Rhan Ellen Kim, Jae Guk Kim, Han-Suk Kim, Hyungoo Shin, Chiwon Ahn, Ho Geol Woo, Byung Kook Lee, Yong Soo Jang, Yu Hyeon Choi, Sung Oh Hwang Clinical and Experimental Emergency Medicine.2023; 10(4): 382. CrossRef
A case report of point-of-care ultrasound directed thrombectomy: a reversible cause of cardiac arrest managed with extracorporeal membrane oxygenation cannulation Megan Hoffer, Salim Aziz, Keith Boniface, Jenna E. Aziz, Ali Pourmand Clinical and Experimental Emergency Medicine.2023; 11(1): 100. CrossRef
Patrick J. Coppler, Benjamin S. Abella, Clifton W. Callaway, Minjung Kathy Chae, Seung Pill Choi, Jonathan Elmer, Won Young Kim, Young-Min Kim, Michael Kurz, Joo Suk Oh, Joshua C. Reynolds, Jon C. Rittenberger, Kelly N. Sawyer, Chun Song Youn, Byung Kook Lee, David F. Gaieski, on behalf of the Korean Hypothermia Network Investigators and the National Post-Arrest Research Consortium
Clin Exp Emerg Med 2018;5(2):100-106. Published online April 30, 2018
Objective A growing interest in extracorporeal cardiopulmonary resuscitation (ECPR) as a rescue strategy for refractory adult out-of-hospital cardiac arrest (OHCA) currently exists. This study aims to determine current standards of care and practice variation for ECPR patients in the USA and Korea.
Methods In December 2015, we surveyed centers from the Korean Hypothermia Network (KORHN) Investigators and the US National Post-Arrest Research Consortium (NPARC) on current targeted temperature management and ECPR practices. This project analyzes the subsection of questions addressing ECPR practices. We summarized survey results using descriptive statistics.
Results Overall, 9 KORHN and 4 NPARC centers reported having ECPR programs and had complete survey data available. Two KORHN centers utilized extracorporeal membrane oxygenation only for postarrest circulatory support in patients with refractory shock and were excluded from further analysis. Centers with available ECPR generally saw a high volume of OHCA patients (10/11 centers care for >75 OHCA a year). Location of, and providers trained for cannulation varied across centers. All centers in both countries (KORHN 7/7, NPARC 4/4) treated comatose ECPR patients with targeted temperature management. All NPARC centers and four of seven KORHN centers reported having a standardized hospital protocol for ECPR. Upper age cutoff for eligibility ranged from 60 to 75 years. No absolute contraindications were unanimous among centers.
Conclusion A wide variability in practice patterns exist between centers performing ECPR for refractory OHCA in the US and Korea. Standardized protocols and shared research databases might inform best practices, improve outcomes, and provide a foundation for prospective studies.
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Objective Our aim was to compare the compression quality, exercise intensity, and energy expenditure in 5-minute single-rescuer cardiopulmonary resuscitation (CPR) using 15:1 or 30:2 compression-to-ventilation (C:V) ratios or chest compression only (CCO).
Methods This was a randomized, crossover manikin study. Medical students were randomized to perform either type of CPR and do the others with intervals of at least 1 day. We measured compression quality, ratings of perceived exertion (RPE) score, heart rate, maximal oxygen uptake, and energy expenditure during CPR.
Results Forty-seven students were recruited. Mean compression rates did not differ between the 3 groups. However, the mean percentage of adequate compressions in the CCO group was significantly lower than that of the 15:1 or 30:2 group (31.2±30.3% vs. 55.1±37.5% vs. 54.0±36.9%, respectively; P<0.001) and the difference occurred within the first minute. The RPE score in each minute and heart rate change in the CCO group was significantly higher than those of the C:V ratio groups. There was no significant difference in maximal oxygen uptake between the 3 groups. Energy expenditure in the CCO group was relatively lower than that of the 2 C:V ratio groups.
Conclusion CPR using a 15:1 C:V ratio may provide a compression quality and exercise intensity comparable to those obtained using a 30:2 C:V ratio. An earlier decrease in compression quality and increase in RPE and heart rate could be produced by CCO CPR compared with 15:1 or 30:2 C:V ratios with relatively lower oxygen uptake and energy expenditure.
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