Objective To evaluate the association between bystander type and successful bystanderdelivered shocks among out-of-hospital cardiac arrest (OHCA) patients with an initial shockable rhythm.
Methods This single-center, retrospective observational study included non-traumatic adult OHCA patients with witnessed and an initial shockable rhythm who were transported to our hospital between April 2013 and June 2024. The term “successful bystander-delivered shocks” was defined as use of an automated external defibrillator by a bystander before emergency medical services arrival. Bystanders were categorized as family members, lay bystanders, on-duty staff, or healthcare professionals. On-duty staff were defined as persons working at the scene at the time of OHCA, and lay bystanders as non-staff passers-by . The primary outcome was successful bystander-delivered shocks . Multivariable logistic regression analyses were performed.
Results 285 patients were included. Median age was 59 [49–69] years, 254 (89.1%) were male, and 184 (64.6%) received bystander-initiated cardiopulmonary resuscitation. The bystander was a family member in 54 cases, a lay bystander in 79 cases, on-duty staff in 131 cases, and a healthcare professional in 21 cases. Successful bystander-delivered shocks differed markedly by bystander type: 3.7% among family members, 36.7% among lay bystanders, 59.5% among on-duty staff, and 76.2% among healthcare professionals. In multivariable logistic regression, the adjusted odds ratios for successful bystander-delivered shocks by bystander type were on-duty staff, 2.29 [1.26–4.17]; healthcare professionals, 6.26 [1.96–19.9]; and family members, 0.08 [0.02–0.36], compared with lay bystanders.
Conclusion OHCA patients for whom the rescuing bystander was on-duty staff or a healthcare professional were significantly more likely to receive successful bystanderdelivered automated external defibrillator shocks than those rescued by lay bystanders.
Objective In February 2024, following the announcement of new government healthcare policies, over 90% of resident physicians in South Korea submitted their resignations. This unprecedented staffing disruption raised concerns regarding its potential impact on the care of critically ill patients, particularly those with out-of-hospital cardiac arrest (OHCA). This study evaluated the effect of resident physician staffing disruptions on in-hospital management and outcomes of patients with OHCA.
Methods We conducted a multicenter retrospective observational study of adult patients (≥18 years) with OHCA of medical etiology in a metropolitan city during two periods: a comparison period (March 1–December 31, 2023) and a staffing disruption period (March 1–December 31, 2024). The primary outcomes were survival to hospital discharge and favorable neurologic outcome, defined as a Cerebral Performance Category score of 1–2. Multivariable logistic regression was used to assess the association between study period and outcomes.
Results A total of 1,516 patients were included (736 in the comparison period and 780 in the staffing disruption period). Baseline characteristics and rates of in-hospital interventions, including percutaneous coronary intervention, targeted temperature management, and extracorporeal membrane oxygenation, were similar between groups. The adjusted odds ratios for favorable neurologic outcome and survival to discharge during the staffing disruption period were 1.05 (95% CI, 0.64–1.74) and 1.26 (95% CI, 0.85–1.88), respectively.
Conclusion Short-term outcomes of patients with OHCA were not significantly affected by resident physician staffing disruptions. These findings suggest that emergency care for OHCA may have been preserved during the observed period.
Hyo Jin Bang, Chun Song Youn, Min Chul Kim, Yongwhan Lim, Young-Jae Cho, Bitna Chu, June-Sung Kim, Youn-Jung Kim, Byoung-Gil Yoon, Jin Park, Min-Ju Kang, Kyung Woon Jeung, Soo Hyun Kim, Je Hyeok Oh, Taegyun Kim, Sang Hoon Oh, Yong Soo Kim, Changshin Kang, Dong Hun Lee, Jin Hong Min, Hyo Joon Kim, Do Kyun Kim, Tae-Youn Kim, Youdong Sohn, Gyuhong Shim, Young Hwa Jung, Yunhee Oh, Mi Jin Lee, Jisook Lee, Chang Hee Lee, Youngbin Jang, Yong Soo Jang, Gyu Chong Cho, Kyoung-Chul Cha, Ju Sun Heo, Sung Oh Hwang, Sung Phil Chung
Clin Exp Emerg Med 2026;13(Suppl 1):S75-S100. Published online May 31, 2026
This guideline summarizes evidence-based post–cardiac arrest care following the return of spontaneous circulation (ROSC) in adults, incorporating updates from the 2025 Korean Guidelines for Cardiopulmonary Resuscitation and contemporary international evidence. Recommendations were informed by recent randomized controlled trials and systematic reviews, with an emphasis on patient-centered outcomes and practical clinical applications. After ROSC, early evaluation should focus on identifying reversible causes. A 12-lead electrocardiogram should be obtained promptly, with echocardiography and whole-body computed tomography performed when clinically indicated to assess cardiac function and detect noncardiac or occult etiologies. Respiratory management aims to minimize secondary brain injury by preventing hypoxemia and hyperoxemia. High inspired oxygen concentrations may be used initially, followed by titration to an appropriate oxygen saturation level once reliable measurements are available, and ventilation should target normocapnia. Hemodynamic management prioritizes adequate organ perfusion and prompt treatment of shock, including active correction of hypotension. Routine immediate coronary angiography is not recommended in patients without ST-segment elevation. However, urgent angiography is indicated in those with ST-segment elevation, cardiogenic shock, or a high likelihood of ongoing myocardial ischemia. In comatose survivors, temperature control is essential. The selected target temperature should be maintained for at least 24 hours, with active fever prevention for 36 to 72 hours. Additional intensive care unit management includes glucose control and seizure monitoring. Routine prophylactic antibiotics or anticonvulsants are not recommended. Neuroprognostication should use a multimodal approach after confounders, such as sedation and temperature management, are addressed, integrating clinical examination, electrophysiology, biomarkers, and neuroimaging to support individualized decision-making.
Objective To investigate the association between admission blood glucose (BG) and 30-day survival and neurological outcomes in adult, non-diabetic out-of-hospital cardiac arrest (OHCA) patients with return of spontaneous circulation (ROSC).
Methods We conducted a single-center retrospective cohort study (2014-2023) including 1,128 non-diabetic adults with OHCA who achieved ROSC. Patients were stratified by admission BG into four categories: <80 mg/dL, 80–179 mg/dL, 180–299 mg/dL, and ≥300 mg/dL. Primary outcomes were 30-day survival and favorable neurological status (Cerebral Performance Category [CPC] 1–2). Multivariable logistic regression models adjusted for major confounders (age, sex, initial rhythm, bystander CPR, call-to-arrival time, and extracorporeal CPR) using the 80–179 mg/dL group as the reference. Restricted cubic spline analyses explored potential nonlinear relationships between BG and outcomes.
Results Patients with mild-to-moderate hyperglycemia (180–299 mg/dL) demonstrated the highest 30-day survival (14.7%) and favorable neurological outcome (10.8%) rates, compared with hypoglycemia (6.6% and 4.7%; both p < 0.05). In adjusted analyses, hypoglycemia (<80 mg/dL) and severe hyperglycemia (≥300 mg/dL) were associated with significantly lower odds of survival (adjusted odds ratio [aOR] = 0.41, 95% CI 0.21–0.79; and aOR = 0.69, 95% CI 0.52–0.91, respectively). Spline analysis revealed a U-shaped association, with optimal survival observed at 140–195 mg/dL.
Conclusion Admission BG is an easily measurable prognostic biomarker in non-diabetic OHCA. Mild-to-moderate hyperglycemia was associated with the most favorable short-term outcomes, whereas both hypoglycemia and severe hyperglycemia predicted worse survival and neurological recovery.
Objective This study investigated the relationship between post-rewarming control temperature and neurological outcomes using data from a multicenter post–cardiac arrest syndrome (PCAS) registry in Korea. Methods We retrospectively analyzed data from the PCAS registry, which prospectively enrolled out-of-hospital cardiac arrest patients with sustained return of spontaneous circulation in the emergency departments of three urban hospitals between December 2013 and April 2021. Patients who received targeted temperature management (TTM) were included. Body temperature was measured at 4-hour intervals during the first 72 hours after the initiation of TTM. The post-rewarming control temperature was defined as the body temperature measured at 72 hours after TTM initiation. The primary outcome was a favorable neurological outcome, defined as a Cerebral Performance Category score of 1–2 at 1 year, and the secondary outcome was 1-year mortality. Results Of the 1,591 patients in the registry, 289 were included in the analysis. A favorable neurological outcome occurred in 75 patients (25.9%). Patients with favorable neurological outcomes exhibited higher body temperatures at 4 hours and during the 48–72-hour period of TTM than those with unfavorable outcomes. Body temperature at 72 hours of TTM was independently associated with 1-year mortality (adjusted odds ratio [aOR], 0.56; 95% confidence interval [CI], 0.37–0.82; P=0.004), but not with favorable neurological outcomes at 1 year (aOR, 1.24; 95% CI, 0.75–2.09; P=0.399). Conclusion A lower body temperature at 72 hours after TTM was independently associated with 1-year mortality.
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Incremental Value of Adding S100B to NSE for High-Specificity Rule-in of Poor Neurological Outcome After Out-of-Hospital Cardiac Arrest Seokjae Hong, Seungho Lee, Jung Soo Park, Jin Hong Min, Changshin Kang, Byung Kook Lee Journal of Clinical Medicine.2026; 15(8): 3043. CrossRef
Objective Eye deviation is recognized as a clinical indicator of brain function in acute brain injury. This study investigated the association between radiological eye deviation on brain computed tomography (CT) and neurological outcomes in post–cardiac arrest patients.
Methods This single-center retrospective observational study included adult patients with out-of-hospital cardiac arrest of presumed medical cause who achieved return of spontaneous circulation and underwent brain CT within 24 hours between January 2012 and December 2022. Radiological lateral eye deviation angles were quantitatively measured on brain CT images. Multivariate logistic regression analysis was performed to identify independent predictors of poor neurological outcome at hospital discharge and in-hospital mortality. Receiver operating characteristic curve analysis was used to assess the diagnostic performance of eye deviation angles and serum biomarkers.
Results Among 141 patients, 127 had poor neurological outcomes. Nonconjugate eye deviation was more frequent in the poor outcome group (71.7% vs. 42.9%) and showed a significant association in univariate analysis (odds ratio, 3.37; 95% confidence interval, 1.10–10.90; P=0.035), but it lost significance after multivariate adjustment. The diagnostic accuracy of the conjugate eye deviation angle was modest (area under the curve [AUC], 0.611) and inferior to that of serum S-100B protein (AUC, 0.790).
Conclusion Radiographic eye deviation on brain CT alone is insufficient to reliably predict neurological outcomes after cardiac arrest. Further large-scale studies incorporating multimodal approaches are warranted to clarify its prognostic value.
Objective Early recognition of out-of-hospital cardiac arrest is frequently hindered by the presence of agonal or abnormal breathing, which can lead to delays in dispatcher-assisted cardiopulmonary resuscitation. Improving the recognition of respiratory anomalies may optimize early intervention and improve survival outcomes. This scoping review aimed to map the strategies used by emergency medical dispatchers to identify respiratory anomalies predictive of cardiac arrest during emergency calls.
Methods A scoping review of the literature was conducted in accordance with JBI recommendations and reported following the PRISMA-ScR guidelines. The PCC (population, concept, and context) framework focused on emergency medical dispatchers, strategies to recognize breathing abnormalities predictive of cardiac arrest, and their application during emergency calls. Experimental, observational, and qualitative studies indexed in PubMed, Scopus, the Cochrane Library, and CINAHL up to June 30, 2025, were included.
Results Of 109 records identified, 16 studies met the inclusion criteria. Three thematic areas emerged: (1) modifications to dispatch protocols, including the addition of focused questions to improve detection of agonal breathing and cardiac arrest; (2) hand-on-belly assessment, which, although infrequently used, improved diagnostic accuracy but introduced modest delays in cardiopulmonary resuscitation initiation; and (3) the use of caller-reported breathing descriptors, which reduced missed or delayed recognition of cardiac arrest. Dispatcher training, caller-related factors, and the use of technological aids were identified as secondary cross-cutting themes.
Conclusion Strategies such as protocol modifications, hand-on-belly assessment, and the systematic use of breathing descriptors may enhance dispatcher recognition of cardiac arrest. Structured training that integrates technical competencies and communication skills is essential to optimize the implementation of these strategies. Further research should evaluate the effects of these interventions on survival outcomes across diverse cultural and organizational settings.
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Objective
We aimed to compare the 72-hour survival of the endotracheal intubation (ETI) with video laryngoscope (VL), ETI with direct laryngoscope (DL), and supraglottic airway (SGA) in out-of-hospital cardiac arrest (OHCA) patients in Korea.
Methods
This study included adult OHCA patients who received advanced airway management by designated response teams for severe disease, using a nationwide OHCA registry in South Korea from July 2019 to December 2021. The primary outcome was 72-hour survival, and secondary outcomes were survival to hospital discharge and good neurological recovery. Multivariable logistic regression was used, adjusted for confounders, to compare the outcomes among the three airway management methods.
Results
Among 77,629 OHCA cases, 10,857 were included. SGA was attempted in 9,379 cases, ETI with DL in 493 cases, and ETI with VL in 985 cases. The rates of any prehospital ROSC and 72-hour survival were 13.3% and 11.0% for SGA, 16.0% and 11.4% for ETI with DL, and 18.2% and 11.9% for ETI with VL. Compared to SGA, ETI with VL was significantly associated with 72-hour survival: adjusted odds ratio (OR) [95% confidence interval (CI)] 1.34 (1.06-1.70) for ETI with VL and 1.13 (0.81-1.56) for ETI with DL). There was no significant association between the type of AAM and survival to discharge or good neurological recovery.
Conclusion
In an emergency medical service system staffed by advanced emergency medical technician-level providers, ETI with VL might be associated with improved 72-hour survival compared to SGA. However, this short-term benefit did not extend to survival to hospital discharge.
Objective We investigated the possible association between lower serum lactate to albumin ratio upon hospital arrival and out-of-hospital cardiac arrest (OHCA) outcome.
Methods Records from the Japanese Association for Acute Medicine–Out-of-Hospital Cardiac Arrest (JAAM-OHCA) Registry were used for this multicenter observational study. Enrolled patients were ≥18 years old with OHCA of medical etiology who were hospitalized after spontaneous circulation returned between June 1, 2014, and December 31, 2021. We excluded those with missing data or those who failed to meet predefined inclusion criteria. The primary outcome was a cerebral performance category scale of 1 or 2 which indicated 30-day survival with favorable neurological outcome. Patients were divided into quartiles based on serum lactate to albumin ratios. The multivariable logistic regression analysis included adjustment for multiple factors.
Results Data from 4,413 patients were analyzed. The primary outcome was achieved by 558 of 1,104 patients (50.5%) in the first quartile (lactate to albumin ratio, ≤2.23), 240 of 1,111 patients (21.6%) in the second quartile (lactate to albumin ratio >2.23–3.39), 96 of 1,096 patients (8.8%) in the third quartile (lactate to albumin ratio >3.39–4.70), and 24 of 1,102 patients (2.2%) in the fourth quartile (lactate to albumin ratio, >4.70). Adjusted odds ratios (95% confidence intervals) for the primary outcome in the second, third, and fourth quartile compared with the first quartile were 0.33 (0.26–0.42), 0.19 (0.14–0.26), and 0.07 (0.04–0.11), respectively.
Conclusion A statistically significant association between categorization in the lower lactate to albumin ratio quartile group and favorable neurological outcome after OHCA was identified.
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Objective To determine whether a transesophageal echocardiography (TEE) probe can accurately measure temperature and be used to monitor temperature changes over time without overheating in an experimental model of hypothermia and rewarming. Methods A 6-L water bath was heated with a sous vide immersion circulator to 24, 28, 32, and 36 °C to simulate severe hypothermia, moderate hypothermia, mild hypothermia, and normothermia, respectively. A TEE probe, esophageal temperature probe, and bladder temperature probe were used to measure temperature every 60 seconds for 15 minutes. Results The TEE probe reported temperatures with a mean difference of 0.60 °C (95% confidence interval [CI], 0.51 to 0.69 °C) compared to the sous vide immersion circulator. The esophageal probe and bladder probe reported temperatures with a mean difference of –0.19 °C (95% CI, –0.23 to –0.14 °C) and –0.20 °C (95% CI, –0.26 to –0.14 °C), respectively. Conclusion During this simulation, the TEE tip temperature did not increase beyond the expected changes produced by water temperature. The probe temperature was less accurate than the esophageal and bladder temperature probes but demonstrated precision in monitoring temperature changes and stable hypothermia. Based on this study, TEE probes should not be relied upon for an accurate initial temperature but can likely be used to monitor changes in temperature over time.
Objective We evaluated prognostic factors for pediatric drowning patients. The association between functional outcomes and clinical factors was investigated.
Methods A retrospective cohort study was conducted using data for pediatric drowning patients from the Korean Community-based Severe Trauma Survey from 2016 to 2020. The primary outcome was a good prognosis at discharge, defined as a Glasgow Outcome Scale score of 5. A multivariable logistic regression analysis was performed to evaluate independent factors associated with the primary outcome.
Results From 237,616 patients, we identified 406 drowning patients aged ≤19 years (mean age, 8.8 years). At discharge, 41.0% of those patients had a good recovery. The absence of prehospital cardiac arrest (adjusted odds ratio [aOR], 98.7; 95% confidence interval [CI], 32.9–295.8), indoor location (aOR, 4.0; 95% CI, 1.7–9.3), and transfer to a high-volume hospital (aOR, 2.5; 95% CI, 1.1–5.8) were significant independent factors associated with a good outcome. Age, sex, the intent of injury, and prehospital time were not associated with the outcome.
Conclusion Our study identified independent prognostic factors for drowning patients, highlighting the importance of prehospital conditions and hospital care settings in determining outcomes. These findings could be useful in developing clinical strategies for managing such patients.
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This bibliometric analysis of the 100 most cited articles on experimental cardiac arrest models in rats identifies key contributors, publication trends, research themes, and collaboration networks. A comprehensive literature search of the Web of Science database was performed on June 11, 2024, using keywords related to cardiac arrest and rat models. The top 100 most cited articles were analyzed using the biblioshiny web application from the bibliometrix R ver. 4.2.3 and categorized by primary research focus. The articles were published from 1980 to 2022 and involved 416 authors and 44 journals, averaging 106.7 citations each. The primary research themes were neurology (72%), organ transplantation (7%), cardiovascular system (6%), Cardiopulmonary resuscitation outcomes after local anesthetic toxicity (4%), and other topics (5%). The United States, Japan, and Germany were leading contributors. Major clusters identified include “cerebral ischemia and outcomes,” “brain imaging metrics,” and “blood brain barrier.” The most commonly used methodologies for cardiac arrest induction were asphyxia, induction by magnesium or potassium chloride, and electrical stimulation. This first bibliometric analysis on this topic reveals the dominance of neuroscience in experimental cardiac arrest models in rats. High-impact journals such as the Journal of Cerebral Blood Flow and Metabolism play critical roles in disseminating significant research. The study highlights substantial gaps in global research engagement, with minimal contributions from lower income countries and few international collaborations. This analysis provides a roadmap for future research and opportunities for more extensive international and interdisciplinary collaboration, always with a focus on scientific rigor.
Objective The Korean National Fire Agency conducted a pilot project examining Advanced Life Support (ALS) protocols, including epinephrine administration, to improve survival among patients suffering out-of-hospital cardiac arrest (OHCA). In this study, we aimed to evaluate the effects of the Korean National Fire Agency ALS protocol on prehospital return of spontaneous circulation (ROSC) in patients with OHCA.
Methods This study included patients with adult-presumed cardiac arrest between January and December 2020. The main factor of interest was ambulance type according to ALS protocol, which was divided into dedicated ALS ambulance (DA), smartphone-based ALS ambulance (SALS), and non-DA, and the main analysis factor was prehospital ROSC. Multivariate logistic regression analysis was performed.
Results During the study period, a total of 18,031 adult patients with OHCA was treated by the emergency medical services, including 7,520 DAs (41.71%), 2,622 SALSs (14.54%), and 7,889 non-DAs (43.75%). The prehospital ROSC ratio was 13.19% for DA, 11.17% for SALS, and 7.91% for non-DA (P<0.01). Compared with that of the DA group, the odds ratios (95% confidence interval) for prehospital ROSC ratio were 0.97 (0.82–1.15) in the SALS group and 0.57 (0.50–0.65) in the non-DA group. The prehospital ROSC ratio of the DA group was higher than those of the non-DA group and the SALS group.
Conclusion ALS protocol intervention was associated with prehospital ROSC rates. Therefore, continuous efforts to promote systemic implementation of the ALS protocol to improve OHCA outcomes are necessary.
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Objective Clinical trials on demodynamic-directed cardiopulmonary resuscitation have been limited. The aim of this study is to investigate whether Augmented-Medication CardioPulmonary Resuscitation (AMCPR) would improve the odds of return of spontaneous circulation (ROSC) in patients with out-of-hospital cardiac arrest.
Methods This is a double-blind, single-center, randomized placebo-controlled trial that will be conducted in the emergency department of a tertiary, university-affiliated hospital in Seoul, Korea. A total of 148 adult patients with nontraumatic, nonshockable, out-of-hospital cardiac arrest who have an initial diastolic blood pressure above 20 mmHg will be randomly assigned to two groups of 74 patients (a 1:1 ratio). Patients will receive an intravenous dose of 40 IU of vasopressin with epinephrine, or a placebo with epinephrine. The primary endpoint is a sustained ROSC (over 20 minutes). Secondary endpoints are enhanced diastolic blood pressure, end-tidal carbon dioxide levels, acidosis, and lactate levels during resuscitation.
Discussion AMCPR is a trial about tailored medication for select patients during resuscitation. This is the first randomized control trial to identify patients who would benefit from vasopressin for achieving ROSC. This study will provide evidence about the effect of administration of vasopressin with epinephrine to increase ROSC rate.
Trial registration ClinicalTrials.gov identifier: NCT03191240. Registered on June 19, 2017.
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Objective This study aimed to evaluate the association between the number and level of emergency medical technicians (EMTs) in the first-contact emergency medical services (EMS) unit and the clinical outcomes of out-of-hospital cardiac arrest (OHCA) with a dual dispatch response.
Methods Adult nontraumatic EMS-treated OHCAs between 2015 and 2018 in a nationwide database, were enrolled. The main exposure was the number and certification level of first-contact EMS crew: three versus two members, proportion of EMT intermediate level (EMT-I) over 50% versus under or equal to 50%. Good neurologic recovery was selected as the primary outcome. Multilevel multivariable logistic regression analysis was conducted to calculate adjusted odds ratios and confidence intervals.
Results A total of 26,867 patients were enrolled and analyzed. Good neurologic recovery was different across the study groups: 5.4% in the two-member crews, 7.2% in the three-member crews, 5.9% in the low EMT-I proportion crews, and 6.8% in the high EMT-I proportion crews. In the main analysis, statistically significant differences for favorable outcomes were found between the three-member and two-member crews, and the high EMT-I proportion and low EMT-I proportion crews; for good neurologic recovery, adjusted odds ratios (95% confidence interval) were 1.23 (1.06–1.43) for three-member crews, and 1.28 (1.17–1.40) for a high EMT-I proportion.
Conclusion The higher number and level of first-contact EMS crew was associated with better neurologic recovery in adult nontraumatic OHCA with a dual-dispatched EMS response.
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Objective In the present study, intracranial pressure (ICP) changes were investigated in out-ofhospital cardiac arrest (OHCA) patients with and without malignant blood-brain barrier (BBB) disruption who underwent target temperature management.
Methods This prospective, single-center, observational study was conducted from June 2019 to December 2021. ICP and albumin quotient values were measured on days 1, 2, 3, and 4 of hospitalization. Malignant BBB disruption was defined as the sum of scores for the degree of BBB disruption ≥9 on days 1 to 4.
Results ICP in OHCA patients without malignant BBB disruption on days 1, 2, 3, and 4 of hospitalization was 9.58±0.53, 12.32±0.65, 14.39±0.76, and 13.88±0.87 mmHg, respectively, and in OHCA patients with malignant BBB disruption 13.65±0.74, 15.72±0.67, 16.10±0.92, and 15.22±0.87 mmHg, respectively (P<0.001, P<0.001, P=0.150, and P=0.280, respectively). The P-values of changes in ICP between days 1 and 2, days 2 and 3, and days 3 and 4 of hospitalization in OHCA patients without malignant BBB disruption were P<0.001, P=0.001, and P=0.540, respectively, and in OHCA patients with malignant BBB disruption were P=0.002, P=0.550, and P=0.100, respectively.
Conclusion Among OHCA patients treated with target temperature management, ICP was higher on days 1 and 2 of hospitalization and an increase in ICP occurred earlier with malignant BBB disruption than without malignant BBB disruption.
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Objective We hypothesized that a multi-tier response (MTR) will provide high-quality cardiopulmonary resuscitation including airway management. However, the type of tier response system and airway management will have different interactive effects resulting in varying outcomes following out-of-hospital cardiac arrest (OHCA). This study aimed to determine whether the advanced airway management method has an effect on OHCA outcomes and to compare the size of the effect across MTR types.
Methods This is a retrospective population-based observational study using the Korea OHCA Registry. Airway management methods were categorized into endotracheal intubation (ETI) and supraglottic airway (SGA) groups. The tier system was categorized into single-tier response (STR) or two types of MTR: ambulance-ambulance MTR or fire engine-ambulance MTR.
Results In total, 45,264 patients were analyzed among the 89,087 emergency medical service assessed OHCAs. The SGA group was significantly associated with a lower prehospital return of spontaneous circulation (ROSC) rate compared to the ETI group (adjusted odds ratio [aOR], 0.79; 95% confidence interval [CI], 0.72–0.88). Both MTR with an ambulance or fire engine were significantly associated with higher prehospital ROSC rates compared to STR (STR vs. MTR with an ambulance: aOR, 1.33; 95% CI, 1.21–1.47; STR vs. MTR with a fire engine: aOR, 1.43; 95% CI, 1.20–1.71). Prehospital SGA was significantly associated with poor neurological outcomes in MTR with fire engine (aOR, 0.71; 95% CI, 0.53–0.96).
Conclusion In this nationwide observational study, we observed that MTR was associated with higher prehospital ROSC than STR. Moreover, SGA is associated with a lower prehospital ROSC rate regardless of tier response type compared to ETI.
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Objective High-quality cardiopulmonary resuscitation with chest compression is important for good neurologic outcomes during out-of-hospital cardiac arrest (OHCA). Several types of mechanical chest compression devices have recently been implemented in Korean emergency medical services. This study aimed to identify the effect of prehospital mechanical chest compression device use on the outcomes of OHCA patients.
Methods We retrospectively analyzed data drawn from the regional cardiac arrest registry in Daegu, Korea. This registry prospectively collected data from January 2017 to December 2020. Patients aged 18 years or older who experienced cardiac arrest presumed to have a medical etiology were included. The exposure variable was the use of a prehospital mechanical device during transportation by emergency medical technicians. The outcomes measured were neurologic outcomes and survival to discharge. Logistic regression analysis was used.
Results Among 3,230 OHCA patients, 1,111 (34.4%) and 2,119 (65.6%) were managed with manual chest compression and with a mechanical chest compression device, respectively. The mechanical chest compression group showed poorer neurologic outcomes than the manual chest compression group (adjusted odds ratio, 0.12; 95% confidence interval, 0.04–0.33) and decreased survival to discharge (adjusted odds ratio, 0.39; 95% confidence interval, 0.19–0.82) after adjustment for confounding variables.
Conclusion Prehospital mechanical chest compression device use in OHCA was associated with poorer neurologic outcomes and survival to discharge compared to manual chest compression.
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Objective We aimed to identify the association between low serum total cholesterol levels and the risk of out-of-hospital cardiac arrest (OHCA).
Methods This case-control study was performed using datasets from the Cardiac Arrest Pursuit Trial with Unique Registration and Epidemiologic Surveillance (CAPTURES) project and the Korea National Health and Nutrition Examination Survey (KNHANES). Cases were defined as emergency medical service-treated adult patients who experienced OHCA with a presumed cardiac etiology from the CAPTURES project dataset. Four controls from the KNHANES dataset were matched to each case based on age, sex, and county. Multivariable conditional logistic regression analysis was conducted to evaluate the effect of total cholesterol levels on OHCA.
Results A total of 607 matched case-control pairs were analyzed. We classified total cholesterol levels into six categories (<148, 148-166.9, 167-189.9, 190-215.9, 216.237.9, and ≥238 mg/dL) according to the distribution of total cholesterol levels in the KNHANES dataset. Subjects with a total cholesterol level of 167-189.9 mg/dL (25th.49th percentile of the KNHANES dataset) were used as the reference group. In both the adjusted models and sensitivity analysis, a total cholesterol level of <148 mg/dL was significantly associated with OHCA (adjusted odds ratio [95% confidence interval], 6.53 [4.47.9.56]).
Conclusion We identified an association between very-low total cholesterol levels and an increased risk of OHCA in a large, community-based population. Future prospective studies are needed to better understand how a low lipid profile is associated with OHCA.
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Objective This study aimed to compare the outcomes of adult out-of-hospital cardiac arrest (OHCA) before and after the coronavirus disease 2019 (COVID-19) outbreak in a large metropolitan city.
Methods This before-and-after observational study used a prospective citywide OHCA registry. Adult patients with emergency medical service-treated OHCA, with presumed cardiac etiology, pre- and post-COVID-19 outbreak were enrolled. The study period spanned 2 months, starting from February 18, 2020. The control period was 2 months from February 18, 2019. The primary and secondary outcomes were good neurologic outcome and survival to hospital discharge, respectively. The association between the COVID-19 outbreak and OHCA outcomes was assessed using multivariable logistic regression analysis.
Results This study analyzed 297 OHCA patients (control period, 145; study period, 152). The bystander cardiopulmonary resuscitation rates were 64.8% and 60.5% during the control and study periods, respectively. Response and on-scene times increased by 2 minutes, supraglottic airway use increased by 35.6%, and mechanical chest compression device use increased by 13% post-COVID-19 outbreak. Good neurologic outcome was significantly lower during the study period in overall OHCAs (adjusted odds ratio, 0.23; 95% confidence interval, 0.05–0.98) and in witnessed OHCAs (adjusted odds ratio, 0.14; 95% confidence interval, 0.02–0.90). No significant difference was found in the survival to hospital discharge of OHCA patients between the two periods.
Conclusion During the COVID-19 pandemic, the response and on-scene times were longer, and good neurologic outcome was significantly lower than that in the control period.
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Objective Delivery of prehospital defibrillation for shockable rhythms by emergency medical service providers is crucial for successful resuscitation in out-of-hospital cardiac arrest (OHCA) patients. The optimal range of prehospital defibrillation attempts for refractory shockable rhythms is unknown. This study evaluated the association between the number of prehospital defibrillation attempts and neurologic outcomes in OHCA patients.
Methods A retrospective observational study was conducted using the nationwide OHCA registry. Adult OHCA patients who were treated by emergency medical service providers due to presumed cardiac origin with initial shockable rhythm were enrolled from 2013 to 2016. The final analysis was performed on patients without on-scene return of spontaneous circulation. The number of prehospital defibrillation attempts was categorized as follows: 2–3, 4–5, and ≥6 attempts. The primary outcome was a good neurologic recovery at hospital discharge. Multivariate logistic regression analysis was performed to evaluate the association between neurologic outcomes and the number of prehospital defibrillation attempts.
Results A total of 4,513 patients were included in the final analysis. The numbers of patients for whom 2–3, 4–5, and ≥6 defibrillation attempts were made were 2,720 (60.3%), 1,090 (24.2%), and 703 (15.5%), respectively. Poorer outcomes were associated with ≥6 defibrillation attempts: survival to hospital discharge (adjusted odds ratio, 0.38; 95% confidence interval, 0.21–0.65) and good neurologic recovery (adjusted odds ratio, 0.42; 95% confidence interval, 0.21–0.84).
Conclusion Six or more prehospital defibrillation attempts were associated with poorer neurologic outcomes in OHCA patients with an initial shockable rhythm who were unresponsive to on-scene defibrillation and resuscitation.
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Clin Exp Emerg Med 2020;7(4):250-258. Published online December 31, 2020
Objective High-quality intensive care, including targeted temperature management (TTM) for patients with postcardiac arrest syndrome, is a key element for improving outcomes after out-of-hospital cardiac arrest (OHCA). We aimed to assess the status of postcardiac arrest syndrome care, including TTM and 6-month survival with neurologically favorable outcomes, after adult OHCA patients were treated with TTM, using data from the Korean Hypothermia Network prospective registry.
Methods We used the Korean Hypothermia Network prospective registry, a web-based multicenter registry that includes data from 22 participating hospitals throughout the Republic of Korea. Adult comatose OHCA survivors treated with TTM between October 2015 and December 2018 were included. The primary outcome was neurological outcome at 6 months.
Results Of the 1,354 registered OHCA survivors treated with TTM, 550 (40.6%) survived 6 months, and 413 (30.5%) had good neurological outcomes. We identified 839 (62.0%) patients with preClinsumed cardiac etiology. A total of 937 (69.2%) collapses were witnessed, shockable rhythms were demonstrated in 482 (35.6%) patients, and 421 (31.1%) patients arrived at the emergency department with prehospital return of spontaneous circulation. The most common target temperature was 33°C, and the most common target duration was 24 hours.
Conclusion The survival and good neurologic outcome rates of this prospective registry show great improvements compared with those of an earlier registry. While the optimal target temperature and duration are still unknown, the most common target temperature was 33°C, and the most common target duration was 24 hours.
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Yung Jae Yoo, Gi Woon Kim, Choung Ah Lee, Yong Jin Park, Kyoung Mi Lee, Jin Seong Cho, Won Jung Jeong, Hyuk Joong Choi, Han Joo Choi, Nam Hun Heo, Hyung Jun Moon
Clin Exp Emerg Med 2020;7(3):225-233. Published online September 30, 2020
Objective To analyze the differences in characteristics and outcomes between public bath (PB)- related and non-PB-related out-of-hospital cardiac arrest (OHCA) patients in South Korea.
Methods We performed a retrospective observational analysis of collected data from the Smart Advanced Cardiac Life Support (SALS) registry between September 2015 and December 2018. We included adult OHCA patients (aged >18 years) with presumed OHCA of non-traumatic etiology who were attended by dispatched emergency medical services. SALS is a field advanced life support with smartphone-based direct medical direction. The primary outcome was the survival to discharge rate measured at the time of discharge.
Results Of 38,995 cardiac arrest patients enrolled in the SALS registry, 11,889 were included in the final analysis. In total, 263 OHCAs occurred in PBs. Male sex and bystander cardiopulmonary resuscitation proportions appeared to be higher among PB patients than among non-PB patients. Percentages for shockable rhythm, witnessed rate, and number of underlying disease were lower in the PB group than in the non-PB group. Prehospital return of spontaneous circulation (11.4% vs. 19.5%, P=0.001), survival to discharge (2.3% vs. 9.9%, P<0.001), and favorable neurologic outcome (1.9% vs. 5.8%, P=0.007) in PB patients were significantly poorer than those in non-PB patients.
Conclusion Patient characteristics and emergency medical services factors differed between PB and non-PB patients. All outcomes of PB-related OHCA were poorer than those of non-PB-related OHCA. Further treatment strategies should be developed to improve the outcomes of PBrelated cardiac arrest.
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Objective To investigate variations in the effects of prehospital advanced airway management (AAM) on outcomes of out-of-hospital cardiac arrest (OHCA) patients according to regional emergency medical service (EMS) systems in four Asian cities.
Methods We enrolled adult patients with EMS-treated OHCA of presumed cardiac origin between 2012 and 2014 from Osaka (Japan), Seoul (Republic of Korea), Singapore (Singapore), and Taipei (Taiwan). The main exposure variable was prehospital AAM. The primary endpoint was neurological recovery. We compared outcomes between the prehospital AAM and non-AAM groups using multivariable logistic regression with an interaction term between prehospital AAM and the four Asian cities.
Results A total of 16,510 patients were included in the final analyses. The rates of prehospital AAM varied among Osaka, Seoul, Singapore, and Taipei (65.0%, 19.2%, 84.9%, and 34.1%, respectively). The non-AAM group showed better outcomes than the AAM group (adjusted odds ratio [aOR] for neurological recovery 0.30; 95% confidence interval [CI], 0.24–0.38]). In the interaction model for neurological recovery, the aORs for AAM in Osaka and Singapore were 0.12 (95% CI, 0.06–0.26) and 0.21 (95% CI, 0.16–0.28), respectively. In Seoul and Taipei, the association between prehospital AAM and neurological recovery was not significant (aOR 0.58 [95% CI, 0.31–1.10] and 0.79 [95% CI, 0.52–1.20], respectively). The interaction between prehospital AAM and region was significant (P=0.01).
Conclusion The effects of prehospital AAM on outcomes of OHCA patients differed according to regional variability in the EMS systems.
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Objective To evaluate the prognostic factors associated with the sustained return of spontaneous circulation (ROSC) and survival to hospital discharge in traumatic out-of-hospital cardiac arrest (TOHCA) patients without prehospital ROSC.
Methods We analyzed Korean nationwide data from the Out-of-Hospital Cardiac Arrest Surveillance, and included adult TOHCA patients without prehospital ROSC from January 2012 to December 2016. The primary outcome was sustained ROSC (>20 minutes). The secondary outcome was survival to discharge. Multivariate analysis was performed to investigate factors associated with the outcomes of TOHCA patients.
Results Among 142,905 cases of OHCA, 8,326 TOHCA patients were investigated. In multivariate analysis, male sex (odds ratio [OR], 1.326; 95% confidence interval [CI], 1.103–1.594; P=0.003), and an initial shockable rhythm (OR, 1.956; 95% CI, 1.113–3.439; P=0.020) were significantly associated with sustained ROSC. Compared with traffic crash, collision (OR, 1.448; 95% CI, 1.086–1.930; P=0.012) was associated with sustained ROSC. Fall (OR, 0.723; 95% CI, 0.589– 0.888; P=0.002) was inversely associated with sustained ROSC. Male sex (OR, 1.457; 95% CI, 1.026–2.069; P=0.035) and an initial shockable rhythm (OR, 4.724; 95% CI, 2.451–9.106; P<0.001) were significantly associated with survival to discharge. Metropolitan city (OR, 0.728; 95% CI, 0.541–0.980; P=0.037) was inversely associated with survival to discharge. Compared with traffic crash, collision (OR, 1.745; 95% CI, 1.125–2.708; P=0.013) was associated with survival to discharge.
Conclusion Male sex, an initial shockable rhythm, and collision could be favorable factors for sustained ROSC, whereas fall could be an unfavorable factor. Male sex, non-metropolitan city, an initial shockable rhythm, and collision could be favorable factors in survival to discharge.
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Objective The incidences of prehospital advanced airway management by emergency medical technicians in South Korea are increasing; however, whether this procedure improves the survival outcomes of patients experiencing out-of-hospital cardiac arrest remains unclear. The present study aimed to investigate the association between prehospital advanced airway management and neurologic outcomes according to a transport time interval (TTI) using the Korean Cardiac Arrest Research Consortium database.
Methods We retrospectively analyzed the favorable database entries that were prospectively collected between October 2015 and December 2016. Patients aged 18 years or older who experienced cardiac arrest that was presumed to be of a medical etiology and that occurred prior to the arrival of emergency medical service personnel were included. The exposure variable was the type of prehospital airway management provided by emergency medical technicians. The primary endpoint was a favorable neurologic outcome.
Results Of 1,871 patients who experienced out-of-hospital cardiac arrest, 785 (42.0%), 121 (6.5%), and 965 (51.6%) were managed with bag-valve-mask ventilation, endotracheal intubation (ETI), and supraglottic airway (SGA) devices, respectively. SGAs and ETI provided no advantage in terms of favorable neurologic outcome in patients with TTIs ≥12 minutes (odds ratio [OR], 1.37; confidence interval [CI], 0.65–2.87 for SGAs; OR, 1.31; CI, 0.30–5.81 for ETI) or in patients with TTI <12 minutes (OR, 0.57; CI, 0.31–1.07 for SGAs; OR, 0.63; CI, 0.12–3.26 for ETI).
Conclusion Neither the prehospital use of SGA nor administration of ETI was associated with superior neurologic outcomes compared with bag-valve-mask ventilation.
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Objective High cholesterol level is a risk factor for coronary artery disease, and coronary artery disease is a major risk factor for out-of-hospital cardiac arrest (OHCA). However, the effect of cholesterol level on outcomes of OHCA has been poorly studied. This study aimed to determine the effect of cholesterol level on outcomes of OHCA.
Methods This cross-sectional study used the CAPTURES (Cardiac Arrest Pursuit Trial with Unique Registration and Epidemiologic Surveillance) project database in Korea. Multivariable conditional logistic regression analysis was performed to estimate the effect of cholesterol level on outcomes in OHCA.
Results In all, 584 cases of OHCA were analyzed; those with cholesterol levels <120 mg/dL were classified as having low total cholesterol (TC) (n=197), those with levels ranging from 120–199 mg/dL as middle TC (n=322), and those with ≥200 mg/dL as high TC (n=65). Compared to low TC, more patients with middle TC and high TC survived to discharge (9.1% vs. 22.0% and 26.2%, respectively, P=0.001). The good cerebral performance category also increased in that order (4.1 % vs. 14.6% and 23.1%, respectively, P≤0.001). Comparing middle TC and high TC with low TC, adjusted odds ratios (95% confidence intervals) were 1.97 (1.06 to 3.64) and 2.53 (1.08 to 5.92) for survival to discharge, respectively, and 2.53 (1.07 to 5.98) and 4.73 (1.63 to 13.71) for good neurological recovery, respectively.
Conclusion Higher cholesterol is associated with better outcomes in OHCA; cholesterol level is a good predictor of outcomes of OHCA.
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Objective This study aimed to determine whether simultaneous decreases in the serum levels of cell adhesion molecules (intracellular cell adhesion molecule-1 [ICAM-1], vascular cell adhesion molecule-1 [VCAM-1], and E-selectin) and S100 proteins within the first 24 hours after the return of spontaneous circulation were associated with good neurological outcomes in cardiac arrest survivors.
Methods This retrospective observational study was based on prospectively collected data from a single emergency intensive care unit (ICU). Twenty-nine out-of-hospital cardiac arrest survivors who were admitted to the ICU for post-resuscitation care were enrolled. Blood samples were collected at 0 and 24 hours after ICU admission. According to the 6-month cerebral performance category (CPC) scale, the patients were divided into good (CPC 1 and 2, n=12) and poor (CPC 3 to 5, n=17) outcome groups.
Results No difference was observed between the two groups in terms of the serum levels of ICAM-1, VCAM-1, E-selectin, and S100 at 0 and 24 hours. A simultaneous decrease in the serum levels of VCAM-1 and S100 as well as E-selectin and S100 was associated with good neurological outcomes. When other variables were adjusted, a simultaneous decrease in the serum levels of VCAM-1 and S100 was independently associated with good neurological outcomes (odds ratio, 9.285; 95% confidence interval, 1.073 to 80.318; P=0.043).
Conclusion A simultaneous decrease in the serum levels of soluble VCAM-1 and S100 within the first 24 hours after the return of spontaneous circulation was associated with a good neurological outcome in out-of-hospital cardiac arrest survivors.
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Predicting neurological outcome after out-of-hospital cardiac arrest with cumulative information; development and internal validation of an artificial neural network algorithm Peder Andersson, Jesper Johnsson, Ola Björnsson, Tobias Cronberg, Christian Hassager, Henrik Zetterberg, Pascal Stammet, Johan Undén, Jesper Kjaergaard, Hans Friberg, Kaj Blennow, Gisela Lilja, Matt P. Wise, Josef Dankiewicz, Niklas Nielsen, Attila Frigye Critical Care.2021;[Epub] CrossRef
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Joo Yeong Kim, Sung Oh Hwang, Sang Do Shin, Hyuk Jun Yang, Sung Phil Chung, Sung Woo Lee, Kyung Jun Song, Seung Sik Hwang, Gyu Chong Cho, Sung Woo Moon, Kyuseok Kim, Won Young Kim, Seil Oh, Young Ho Kwak, on behalf of KoCARC
Clin Exp Emerg Med 2018;5(3):165-176. Published online September 30, 2018
Objective This study aimed to describe the conceptualization, development, and implementation processes of the newly established Korean Cardiac Arrest Resuscitation Consortium (KoCARC) to improve out-of-hospital cardiac arrest (OHCA) outcomes.
Methods The KoCARC was established in 2014 by recruiting hospitals willing to participate voluntarily. To enhance professionalism in research, seven research committees, the Epidemiology and Preventive Research Committee, Community Resuscitation Research Committee, Emergency Medical System Resuscitation Research Committee, Hospital Resuscitation Research Committee, Hypothermia and Postresuscitation Care Research Committee, Cardiac Care Resuscitation Committee, and Pediatric Resuscitation Research Committee, were organized under a steering committee. The KoCARC registry was developed with variables incorporated in the currently existing regional OHCA registries and Utstein templates and were collected via a web-based electronic database system. The KoCARC study population comprises patients visiting the participating hospitals who had been treated by the emergency medical system for OHCA presumed to have a cardiac etiology.
Results A total of 62 hospitals volunteered to participate in the KoCARC, which captures 33.0% of the study population in Korea. Web-based data collection started in October 2015, and to date (December 2016), there were 3,187 cases compiled in the registry collected from 32 hospitals.
Conclusion The KoCARC is a self-funded, voluntary, hospital-based collaborative research network providing high level evidence in the field of OHCA and resuscitation. This paper will serve as a reference for subsequent KoCARC manuscripts and for data elements collected in the study.
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Objective In South Korea, the Gyeonggi Fire Services introduced a multi-tiered dispatch system for out-of-hospital cardiac arrest (OHCA) cases in July 2015. In this study, we investigated whether the multi-tiered dispatch system improved the pre-hospital return of the spontaneous circulation (ROSC) rate.
Methods All non-traumatic adult OHCAs treated and transported by the 119 emergency medical system from July 2015 to December 2015 were included in the study. Demographic and pre-hospital Utstein element-data were collected from the emergency medical system OHCA database. The primary outcome was pre-hospital ROSC as measured at the scene.
Results Of the included OHCAs, 1,436 (89.0%) were categorized to the single-tiered dispatch group and 162 (10.1%) to the multi-tiered dispatch group. The rate of administration of advanced airway ventilation (61.1% vs. 48.0%, P=0.002) and intravenous access (18.5% vs. 12.5%, P=0.037) was higher in the multi-tiered group compared to that in the single-tiered group. The use of epinephrine was higher in the multi-tiered group (4.9% vs. 1.5%, P=0.002). The pre-hospital ROSC rates in the multi-tiered group were higher when compared with the single-tiered group, but the difference was not significant (10.5% vs. 7.5%, P=0.218). The adjusted odds ratio for pre-hospital ROSC rates in the multi-tiered group was 1.29 (95% confidence interval, 0.69 to 2.40).
Conclusion The multi-tiered dispatch system was not associated with a significant increase in the pre-hospital ROSC rate during the early phase of its implementation, even though advanced maneuvers were performed more frequently.
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