Tae-Youn Kim, Gyo Jin Ahn, Kyoung-Chul Cha, Dong-Hyeok Kim, Youdong Sohn, Young Song, Gyuhong Shim, Do Kyun Kim, Yunhee Oh, Jin Wi, Chun Song Youn, Myung-Lyeol Lee, Mi Jin Lee, Byung Kook Lee, Byung Heon Lee, Jisook Lee, Chang Hee Lee, Hannah Lee, Youngbin Jang, Yong Soo Jang, Young Hwa Jung, Woo Jin Jung, Sung Phil Chung, Gyu Chong Cho, Ju Sun Heo, Sung Oh Hwang
Clin Exp Emerg Med 2026;13(Suppl 1):S61-S74. Published online May 31, 2026
The 2025 update of the Korean guidelines for cardiac arrest under special circumstances incorporates new evidence and expert consensus to clarify when clinicians should modify standard resuscitation algorithms. For cardiac arrest caused by acute hyperkalemia, the guidelines suggest administering intravenous insulin with glucose; however, current evidence remains insufficient to recommend for or against routine use of sodium bicarbonate or calcium. In suspected pulmonary embolism–related cardiac arrest, thrombolytic therapy may be considered. In confirmed cases, thrombolysis, surgical embolectomy, or percutaneous mechanical thrombectomy may be appropriate, despite very low certainty of evidence. For opioid-related cardiac arrest, current evidence does not support the routine administration of naloxone in addition to standard advanced life support; however, naloxone may be administered when it is unclear whether the patient is in true cardiac arrest. The guidelines also emphasize managing cardiac arrest in the prone position. If the patient is intubated and immediate repositioning is unsafe or impractical, prone cardiopulmonary resuscitation and defibrillation may be attempted using invasive arterial pressure or end-tidal carbon dioxide monitoring to guide the timing of repositioning. Immediate supination is strongly recommended for non-intubated patients. Additional updates address drowning, severe hypothermia, pregnancy, anaphylaxis, and cardiac arrest during interventional procedures, underscoring the importance of early correction of reversible causes, appropriate airway strategies, and timely consideration of extracorporeal life support in selected cases. Overall, the 2025 recommendations highlight cautious, etiology-directed interventions and explicitly grade recommendation strength and certainty to support context-sensitive clinical decision-making in high-risk and resource-variable settings.
Tae-Youn Kim, Gyo Jin Ahn, Kyoung-Chul Cha, Dong-Hyeok Kim, Youdong Sohn, Young Song, Gyuhong Shim, Do Kyun Kim, Yunhee Oh, Jin Wi, Chun Song Youn, Myung-Lyeol Lee, Mi Jin Lee, Byung Kook Lee, Byung Heon Lee, Jisook Lee, Chang Hee Lee, Hannah Lee, Youngbin Jang, Yong Soo Jang, Young Hwa Jung, Woo Jin Jung, Sung Phil Chung, Gyu Chong Cho, Ju Sun Heo, Sung Oh Hwang
Clin Exp Emerg Med 2026;13(Suppl 1):S32-S60. Published online May 31, 2026
The 2025 Korean advanced life support guidelines were updated using a structured evidence evaluation process informed by recent randomized controlled trials and systematic reviews. The guideline development group prioritized patient-important outcomes and assessed the certainty of the evidence to formulate graded recommendations. For drug administration during adult cardiac arrest, intravenous access is the preferred initial route, with intraosseous access recommended when intravenous access cannot be rapidly established. Epinephrine remains the recommended vasopressor. Routine administration of vasopressin, either alone or in combination with corticosteroids, is not recommended for in-hospital or out-of-hospital cardiac arrest. In the absence of specific indications, the routine use of buffering agents and calcium is discouraged owing to insufficient evidence of their benefits and potential harm. Defibrillation recommendations were refined based on emerging evidence. In adults with refractory ventricular fibrillation or pulseless ventricular tachycardia after multiple unsuccessful defibrillation attempts, vector change or double sequential defibrillation may be considered in selected settings when performed by experienced teams with appropriate equipment. Airway management guidelines recommend cricothyroidotomy as a rescue technique when conventional airway management strategies fail. For patients receiving cardiopulmonary resuscitation while on mechanical ventilation, specific ventilator settings during chest compressions are recommended to optimize ventilation and minimize interference with high-quality cardiopulmonary resuscitation. The guidelines also address cardiopulmonary resuscitation–induced consciousness, allowing the cautious use of sedatives and/or analgesic agents when awareness interferes with resuscitation quality or safety. Overall, the guidelines emphasize evidence-based practice and individualized clinical decision-making.
Sung Oh Hwang, Kyoung-Chul Cha, Woo Jin Jung, Young-Il Roh, Gyo Jin Ahn, Do Kyun Kim, Tae-Youn Kim, Youdong Sohn, Gyuhong Shim, Young Hwa Jung, Yunhee Oh, Chun Song Youn, Mi Jin Lee, Jisook Lee, Chang Hee Lee, Youngbin Jang, Yong Soo Jang, Gyu Chong Cho, Ju Sun Heo, Sung Phil Chung
Clin Exp Emerg Med 2026;13(Suppl 1):S10-S17. Published online May 29, 2026
In Korea, more than 30,000 out-of-hospital cardiac arrests (OHCAs) occur each year, and the survival rate remains below 10%. Because OHCA is difficult to predict and typically occurs outside medical facilities, effective management requires not only healthcare professionals but also laypersons, including bystanders and first responders. Survival depends on an uninterrupted and efficient sequence of time-critical actions: early recognition of cardiac arrest and activation of emergency services; prompt bystander cardiopulmonary resuscitation (CPR); use of an automated external defibrillator (AED) for shockable rhythms; on-scene and in-hospital advanced life support with comprehensive post–cardiac arrest care; and systematic assessment of neurologic and functional outcomes followed by rehabilitation and recovery. The chain of survival describes these essential steps required to maximize survival after cardiac arrest and comprises five links: (1) early recognition and call for help; (2) immediate bystander CPR; (3) early defibrillation with an AED; (4) advanced life support and post–cardiac arrest care; and (5) rehabilitation and recovery for survivors. The cardiac arrest survival environment represents a societal infrastructure that sustains and optimizes both medical and nonmedical factors across prevention, treatment, and rehabilitation to reduce mortality. Establishing such an environment requires each community to develop integrated medical systems for prevention, treatment, rehabilitation, and recovery, alongside nonmedical strategies, including public awareness initiatives, widespread CPR education and bystander participation, AED dissemination, and coordinated community responsiveness of the emergency medical system.
Determining the cause of cardiac arrest (CA) and the heart status during CA is crucial for its treatment. Transesophageal echocardiography (TEE) is an imaging method that facilitates close observation of the heart without interfering with cardiopulmonary resuscitation (CPR). Intra-arrest TEE is a point-of-care ultrasound technique that is used during CPR. Intra-arrest TEE is performed to diagnose the cause of CA, determine the presence of cardiac contraction, evaluate the quality of CPR, assist with catheter insertion, and explore the mechanism of blood flow during CPR. The common causes of CA diagnosed using intra-arrest TEE include cardiac tamponade, aortic dissection, pulmonary embolism, and intracardiac thrombus, which can be observed on a few simple image planes at the mid-esophageal and upper esophageal positions. To operate an intra-arrest TEE program, it is necessary to secure a physician who is capable of performing TEE, provide appropriate training, establish implementation protocols, and prepare a plan in collaboration with the CPR team.
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Objective We conducted a study to validate the effectiveness of the Korean criteria for trauma team activation (TTA) and compared its results with a two-tiered system.
Methods This observational study was based on data from the Korean Trauma Data Bank. Within the study period, 1,628 trauma patients visited our emergency department, and 739 satisfied the criteria for TTA. The rates of overtriage and undertriage in the Korean one-tiered system were compared with the two-tiered system recommended by the American College of Surgery-Committee on Trauma.
Results Most of the patient’s physiologic factors reflected trauma severity levels, but anatomical factors and mechanism of injury did not show consistent results. In addition, while the rate of overtriage (64.4%) was above the recommended range according to the Korean criteria, the rate of undertriage (4.0%) was within the recommended range. In the simulated two-tiered system, the rate of overtriage was reduced by 5.5%, while undertriage was increased by 1.8% compared to the Korean activation system.
Conclusion The Korean criteria for TTA showed higher rates of overtriage and similar undertriage rates compared to the simulated two-tier system. Modification of the current criteria to a two-tier system with special considerations would be more effective for providing optimum patient care and medical resource utilization.