Evaluation of overexposure risk when there is a space between the subject and the couch in computed tomography: a phantom study.

The purpose of this study was to investigate the risk of overexposure associated with automatic tube current modulation (ATCM) and automatic couch height positioning compensation mechanism (AHC) in computed tomography (CT) systems, particularly in scenarios involving a gap between the subject and the couch. Results revealed that when AHC was enabled, CT dose index volume (CTDIvol) increased by approximately 10% at 2.5 cm, 20% at 5.0 cm, and 40% at 10.0 cm gaps compared to close contact conditions. While the AHC function ensures consistent exposure doses and image quality regardless of subject positioning relative to the CT gantry isocenter, the study highlights a potential risk of overexposure when a gap exists between the subject and the couch. These findings offer valuable insights for optimizing CT imaging protocols and underscore the importance of carefully considering subject positioning in clinical practice.

Development and evaluation of a novel water-based pigment marker for radiation therapy skin marking.

Skin marks are widely used in external radiation therapy to ensure the accuracy of the irradiation position. However, conventional skin markers contain harmful substance, so we developed an alternative skin marker. The purpose of this study was to investigate the feasibility of using a novel water-based pigment marker comprising safe materials commonly used in cosmetics for clinical radiation therapy. We investigated various properties of the marker, namely marker longevity, color variety, line visibility, ink bleeding, and line durability, and improved the marker in response to the feel when drawing or being drawn on. The durability of the ink was evaluated by simultaneously applying the new marker and oil-based pen and comparing the period until the marks faded and became invisible. In clinical trial, we applied marks on the skin of 56 patients over three months to observe symptoms and visible changes in the skin. There were no complications of discomfort or pain, owing to the improvements in the marker tip. The marks drawn on the arms of volunteers with the new marker and the oil-based pen remained visible for a mean of 7.2 days and 3.6 days, respectively (P value < 0.001). The percentages of participants with no symptoms and no visible changes were 100%, respectively. We developed an alternative skin marker that complies with current regulatory standards by excluding crystal violet. The newly developed marker has features suitable for clinical use, such as resistance to smudging and water, marker tip shape and texture, and color variations.

Crush syndrome: a review for prehospital providers and emergency clinicians.

INTRODUCTION: Disasters and accidents have occurred with increasing frequency in recent years. Primary disasters have the potential to result in mass casualty events involving crush syndrome (CS) and other serious injuries. Prehospital providers and emergency clinicians stand on the front lines of these patients' evaluation and treatment. However, the bulk of our current knowledge, derived from historical data, has remained unchanged for over ten years. In addition, no evidence-based treatment has been established to date. OBJECTIVE: This narrative review aims to provide a focused overview of, and update on, CS for both prehospital providers and emergency clinicians. DISCUSSION: CS is a severe systemic manifestation of trauma and ischemia involving soft tissue, principally skeletal muscle, due to prolonged crushing of tissues. Among earthquake survivors, the reported incidence of CS is 2-15%, and mortality is reported to be up to 48%. Patients with CS can develop cardiac failure, kidney dysfunction, shock, systemic inflammation, and sepsis. In addition, late presentations include life-threatening systemic effects such as hypovolemic shock, hyperkalemia, metabolic acidosis, and disseminated intravascular coagulation. Immediately beginning treatment is the single most important factor in reducing the mortality of disaster-situation CS. In order to reduce complications from CS, early, aggressive resuscitation is recommended in prehospital settings, ideally even before extrication. However, in large-scale natural disasters, it is difficult to diagnose CS, and to reach and start treatments such as continuous administration of massive amounts of fluid, diuresis, and hemodialysis, on time. This may lead to delayed diagnosis of, and high on-site mortality from, CS. To overcome these challenges, new diagnostic and therapeutic modalities in the CS animal model have recently been advanced. CONCLUSIONS: Patient outcomes can be optimized by ensuring that prehospital providers and emergency clinicians maintain a comprehensive understanding of CS. The field is poised to undergo significant advances in coming years, given recent developments in what is considered possible both technologically and surgically; this only serves to further emphasize the importance of the field, and the need for ongoing research.

Influence of coronavirus disease 2019 case surges on prehospital emergency medical service for patients with trauma in Kobe, Japan.

Aim: In the current era of the coronavirus disease 2019 (COVID-19) pandemic, the responsiveness of emergency medical service (EMS) transport for patients with internal illness is often delayed. However, the influence of the COVID-19 pandemic on prehospital transport for patients with trauma has not yet been fully elucidated. This study aims to examine the effect of COVID-19 case surges on EMS transport for patients with trauma during the COVID-19 states of emergency in Kobe, Japan. Methods: EMS data during the states of emergency were compared with those in the 2019 prepandemic period. The incidence of difficulty securing hospital acceptance (four or more calls to medical institutions and ambulance staying at the scene for 30 min or more) was evaluated as a primary outcome. Secondary outcomes were the time spent at the trauma scene and the number of calls requesting hospital acceptance. The time spent at the trauma scene was stratified by trauma severity. Results: The incidence of difficulty securing hospital acceptance increased (1.2% versus 3.2%, P < 0.01). Logistic regression analysis revealed that the duration of the states of emergency was associated with difficulty securing hospital acceptance (odds ratio [OR] 2.08, 95% confidence interval 1.77-2.45; P < 0.01). Although the mean time spent at the trauma scene among the less severe, moderately severe, and severe trauma groups was prolonged, the time for the life-threatening group did not change. The number of request calls increased during the states of emergency. Conclusion: Difficulty securing hospital acceptance increased; however, the time spent at the trauma scene did not significantly change for the life-threatening group.

Use of Slack for COVID-19 disaster response in Hyogo Prefecture.

INTRODUCTION: The coronavirus disease 2019 (COVID-19) pandemic has caused great disruptions in education and healthcare systems. However, before the COVID-19 pandemic, Hyogo Prefecture did not have a centralized system for sharing information among hospitals, public healthcare centers, the government, fire departments, and medical associations. In March 2021, we used Slack,® an enterprise social network, to invite people from hospitals, healthcare centers, the government, fire departments, and medical associations to join our workspace. This study was undertaken to verify whether the use of Slack can improve information sharing during a disaster. METHODS: A questionnaire on whether information-sharing tools such as Slack are useful for disaster response in Hyogo Prefecture, including for COVID-19, was administered using a Google Form. RESULTS: Of the 19 people who responded to the questionnaire, 15 (78.9 percent) were first-time users of Slack and 18 (94.7 percent) found it easy to use. All 19 participants stated that Slack proved useful in providing pertinent information regarding preventive measures for the control of COVID-19, and they believed that it would be a helpful tool if such disasters were to occur in the future. Regarding the launch time of Slack, 11 respondents (57.9 percent) answered that it was launched at the appropriate time, while five respondents (26.3 percent) answered that it was launched too late. CONCLUSIONS: The participants thought that Slack was effective for accelerating their communication. The use of Slack could also improve future disaster response communications.

Long-term outcomes and prognostic factors of extracorporeal cardiopulmonary resuscitation in patients older than 75 years: a single-centre retrospective study.

BACKGROUND: Few studies have assessed older adult patients who received extracorporeal cardiopulmonary resuscitation (ECPR) after cardiac arrest, and outcomes and prognostic factors of ECPR in this population remain unclear. This study aimed to assess the long-term outcomes and prognostic factors among patients older than 75 years who received ECPR after experiencing cardiac arrest. METHODS: This is a single-centre, retrospective case-control study conducted between August 2010 and July 2019. Consecutive patients older than 75 years who had in-hospital (IHCA) or out-of-hospital cardiac arrest (OHCA) and received ECPR at the Emergency Department in the Hyogo Emergency Medical Center, Hyogo, Japan, were included. The primary outcome was a favourable neurological outcome, defined as a Cerebral Performance Category score of 1-2 at 1 year after the event. Univariate logistic regression was used to determine the association between variables and patient outcomes. RESULTS: Of the 187 patients with cardiac arrest who received ECPR, 30 were older than 75 years and 28 (15% of the cohort receiving ECPR) were examined in this study. The median age of the patients was 79 years (IQR 77-82), and there were 13 (46%) male patients. Neurological outcomes were favourable for seven (25%) patients, five of whom had IHCA and two with out-of-hospital OHCA. On univariate analysis, patients with a favourable outcome had a shorter median total collapse time (TCT) than those with an unfavourable outcome (favourable: 18.0 min (IQR 13.0-33.5) vs unfavourable: 44.0 min (IQR 25.0-53.0); p=0.049). CONCLUSION: In selected patients older than 75 years, ECPR could be beneficial by providing a shorter TCT, which may contribute to favourable neurological outcomes. Nevertheless, further studies are needed to validate these findings.

Association between stress hyperglycemia on admission and unfavorable neurological outcome in OHCA patients receiving ECPR.

BACKGROUND: Stress hyperglycemia is a normal response to stress and has been associated with outcomes in out-of-hospital cardiac arrest (OHCA) patients. However, this association remained unknown in OHCA patients receiving extracorporeal cardiopulmonary resuscitation (ECPR). This study aimed to examine the association between degree of stress hyperglycemia on admission and neurological outcomes at discharge in OHCA patients receiving ECPR. PATIENTS AND METHODS: This was a retrospective cohort study of adult OHCA patients receiving ECPR between 2011 and 2021. Patients were classified into three groups: absence of stress hyperglycemia (blood glucose level on admission < 200 mg/dL), moderate stress hyperglycemia (200-299 mg/dL), and severe stress hyperglycemia (≥ 300 mg/dL). The primary outcome was unfavorable neurological outcome (Cerebral Performance Category: 3-5) at discharge. RESULTS: This study included 160 patients; unfavorable neurological outcomes totaled 79.4% (n = 127). There were 23, 52, and 85 patients in the absence, moderate, and severe stress hyperglycemia groups, respectively. Of each group, unfavorable neurological outcomes constituted 91.3%, 71.2%, and 81.2%, respectively. Multivariable analysis showed that, compared with moderate stress hyperglycemia, absence of stress hyperglycemia on admission was significantly associated with unfavorable neurological outcome at discharge (odds ratio [OR], 4.70; 95% confidence interval [CI], 1.07-33.35; p = 0.039). CONCLUSION: Compared with moderate stress hyperglycemia on admission, absence of stress hyperglycemia showed significant association with unfavorable neurological outcome at discharge in OHCA patients receiving ECPR.

Impact of time from symptom onset to operation on outcome of repair of acute type A aortic dissection with malperfusion.

OBJECTIVES: We analyzed patients with acute type A aortic dissection complicated by malperfusion syndrome to establish whether the timing of operative treatment and the location of malperfusion are factors in determining outcomes. METHODS: A total of 331 patients with acute type A aortic dissection were treated surgically between August 2003 and May 2019. Eighty-four patients (25%) presented with preoperative malperfusion syndrome. Fifty-eight patients with malperfusion syndrome (69%) were transferred to the operating room within 5 hours of the onset of symptoms (immediate repair); 26 patients (31%) were transferred after 5 hours (later repair). We analyzed the effects of immediate aortic repair on surgical outcomes. RESULTS: There was no significant difference in the early mortality rates between patients with immediate and later aortic repair, which were 20.0% (n = 11/58) and 26.9% (n = 7/19), respectively (P = .12). Preoperative coronary malperfusion was the only predictor of early mortality. The cumulative 5-year survivals of patients with malperfusion syndrome in the immediate and later repair groups were 76.7% and 45.4%, respectively. A significant difference was noted in the long-term outcomes between the 2 groups (P = .02). On multivariable Cox survival analysis, coronary malperfusion and shock on arrival were associated with increased long-term mortality (P < .01 and P = .04). Conducting surgery within 5 hours of the onset of symptoms was a significant predictor of favorable long-term outcome (P = .03). CONCLUSIONS: Although preoperative coronary malperfusion and shock on arrival worsened the long-term outcomes in patients undergoing aortic repair for acute type A aortic dissection with preoperative malperfusion syndrome, conducting an operation within 5 hours of the onset of symptoms significantly improved their long-term outcomes.

Improving residential care amid COVID-19: The link between risk factors and hospitalization.

AIM: This study was conducted to investigate the relationship between the hospitalizations and backgrounds of patients with coronavirus disease 2019 to identify specific risk factors. METHODS: This retrospective study used health observation records to analyze the relationship between certain risk factors and the subsequent hospitalization of 321 patients who were discharged from a residential care facility between January 16 and February 8, 2021. The usefulness of a hospitalization prediction score, created based on the presence of comorbidities and sex, was examined. RESULTS: Being older, male, and having a history of high blood pressure or vascular disease were all risk factors. A multivariate analysis with age and hospitalization predictive score as independent variables and hospitalization as the dependent variable showed that age (odds ratio: 1.07, 95 percent confidence interval: 1.03-1.11, p < 0.01) significantly increased hospitalization risk by 7 percent for every 1-year age increase. The median time from illness onset to hospitalization for all patients was 9 days (interquartile range: 8-10). Hypoxia was the most common cause of hospitalization. However, hypoxia and other symptoms, such as cough and dyspnea, were not correlated. CONCLUSION: Given the pandemic, there may come another time when hospitals are not able to accommodate all patients who require care. In such instances, age, sex, the presence of comorbidities, and checking oxygen saturation regularly using a pulse oximeter around 9 days after the onset of the disease should all be considered important, as it may lead to improved and safer operation of overnight care facilities.

A novel extracorporeal cardiopulmonary resuscitation strategy using a hybrid emergency room for patients with pulseless electrical activity.

BACKGROUND: Whether extracorporeal cardiopulmonary resuscitation (ECPR) is indicated for patients with pulseless electrical activity (PEA) remains unclear. Pulmonary embolism with PEA is a good candidate for ECPR; however, PEA can sometimes include an aortic disease and intracranial haemorrhage, with extremely poor neurological outcomes, and can thus not be used as a suitable candidate. We began employing an ECPR strategy that utilised a hybrid emergency room (ER) to perform computed tomography (CT) before extracorporeal membrane oxygenation (ECMO) induction from January 2020. Therefore, the present study aimed to evaluate the effectiveness of this ECPR strategy. METHODS: Medical records of patients who transferred to our hybrid ER and required ECPR for PEA between January 2020 and November 2021 were reviewed. RESULTS: Twelve consecutive patients (median age, 67 [range, 57-73] years) with PEA requiring ECPR were identified in our hybrid ER. Among these patients, nine were diagnosed using an initial CT scan (intracranial haemorrhage (3); cardiac tamponade due to aortic dissection (3); aortic rupture (2); and cardiac rupture (1)), and unnecessary ECMO was avoided. The remaining three patients underwent ECPR, and two of them survived with favourable neurological outcomes. Patients not indicated for ECPR were excluded before ECMO induction. CONCLUSION: Our ECPR strategy that involved the utilisation of a hybrid ER may be useful for the exclusion of patients with PEA not indicated for ECPR and decision making.

Treatment of a gunshot wound (birdshot) patient with traumatic shock in a hybrid emergency room.

Background: Although the Hybrid Emergency Room System (HERS) is a relatively novel method for treating severe trauma patients, there have been few reported cases of gunshot wound patients treated in HERS. Here we report our treatment of a unique gunshot wound case, with shock, in a HERS setting. Case presentation: A 72-year-old male was transferred to our hospital due to a gunshot wound (GSW). He presented with left chest injuries and vital signs consistent with shock. While resuscitating the patient, including massive blood transfusion and surgery to control the damage, a subsequent computed tomography in HERS revealed the internal distribution of the birdshot and damage to the abdominal organs. Lower lobectomy of the left lung and laparotomy for gastrointestinal repair were performed. After a planned repeat operation and reconstruction of the left chest wall, he was discharged uneventfully. Conclusions: HERS during resuscitation was useful for helping clinicians not only to find the bullets' distribution and judge the severity of injury caused by the gunshot, but also to develop subsequent therapeutic strategies for rescuing the gunshot wound patient from a life-threatening situation.

Extracorporeal cardiopulmonary resuscitation in adult patients with out-of-hospital cardiac arrest: a retrospective large cohort multicenter study in Japan.

BACKGROUND: The prevalence of extracorporeal cardiopulmonary resuscitation (ECPR) in patients with out-of-hospital cardiac arrest (OHCA) has been increasing rapidly worldwide. However, guidelines or clinical studies do not provide sufficient data on ECPR practice. The aim of this study was to provide real-world data on ECPR for patients with OHCA, including details of complications. METHODS: We did a retrospective database analysis of observational multicenter cohort study in Japan. Adult patients with OHCA of presumed cardiac etiology who received ECPR between 2013 and 2018 were included. The primary outcome was favorable neurological outcome at hospital discharge, defined as a cerebral performance category of 1 or 2. RESULTS: A total of 1644 patients with OHCA were included in this study. The patient age was 18-93 years (median: 60 years). Shockable rhythm in the initial cardiac rhythm at the scene was 69.4%. The median estimated low flow time was 55 min (interquartile range: 45-66 min). Favorable neurological outcome at hospital discharge was observed in 14.1% of patients, and the rate of survival to hospital discharge was 27.2%. The proportions of favorable neurological outcome at hospital discharge in terms of shockable rhythm, pulseless electrical activity, and asystole were 16.7%, 9.2%, and 3.9%, respectively. Complications were observed during ECPR in 32.7% of patients, and the most common complication was bleeding, with the rates of cannulation site bleeding and other types of hemorrhage at 16.4% and 8.5%, respectively. CONCLUSIONS: In this large cohort, data on the ECPR of 1644 patients with OHCA show that the proportion of favorable neurological outcomes at hospital discharge was 14.1%, survival rate at hospital discharge was 27.2%, and complications were observed during ECPR in 32.7%.

Prehospital emergency life-saving technicians promote the survival of trauma patients: A retrospective cohort study.

OBJECTIVE: Appropriate decisions by medical technicians at a trauma scene may influence a patient's prognosis. Emergency life-saving technicians (ELSTs) are certified specialists trained with the knowledge to provide advanced techniques for prehospital emergency care in Japan. However, the benefit of treatment by ELSTs compared to basic emergency medical technicians (BEMTs) remains unclear. The aim of this study is to determine whether treatment by ELSTs improves outcomes for trauma patients. METHODS: We retrospectively reviewed the Japan Trauma Data Bank for the years 2004 to 2017. Patients transferred to the hospital directly from the trauma scene and at least 16 years old were included in this study. The following criteria were used to exclude patients; presence of burns, untreatable severe traumas, unknown ELST attendance, and missing prognosis. We compared two groups (ELST group: patients transported by emergency medical services (EMS) with the presence of at least one ELST; BEMT group: patients transported only by BEMTs). Primary outcome was survival to discharge. Secondary outcomes were the need of definitive treatments defined by surgical intervention, intravascular radiology and blood transfusion at the receiving hospital within 24 h. A multivariable logistic regression model was used to calculate odds ratio (OR) and confidence intervals (CI) adjusted by age, sex, revised trauma score, and Injury severity score (ISS). RESULTS: Overall survival to discharge did not improve significantly (adjusted OR 1.13, 95% CI 0.99-1.30) with ELST intervention. In-hospital blood transfusion was more frequently required in the ELST group (adjusted OR 1.10, 95% CI 1.01-1.20). Emergency interventions (adjusted OR 1.03, 95% CI 0.97-1.09) were not different between the groups. In stratified analysis, the benefit of ELST attendance for survival was observed among patients with ISS <16 (adjusted OR 1.53, 95% CI 1.10-2.15), aged 65 years or older (adjusted OR 1.27, 95% CI 1.07-1.52), during the earlier study period (2004-2008, adjusted OR 1.50, 95% CI 1.14-1.97), and shorter transportation time (adjusted OR 1.21, 95% CI 1.03-1.41). CONCLUSIONS: Dispatch systems with ELST should be considered for trauma transports, which may benefit elderly or moderate severity trauma groups, with shorter transportation time conditions.

Geriatric trauma prognosis trends over 10 years: analysis of a nationwide trauma registry.

Purpose: With Japan's population rapidly skewing toward aging, the number of geriatric trauma patients is expected to increase. Since we need to continue to improve the quality of geriatric trauma patient care, this study aimed to evaluate in-hospital mortality trends among geriatric trauma patients in Japan over a recent 10-year period. Methods: This was a retrospective cohort study of data from a Japanese nationwide trauma registry (the Japan National Trauma Data Bank) on patients admitted between January 1, 2008 and December 31, 2017. Geriatric patients were defined as those 65 years old and older. The primary outcome was to clarify in-hospital mortality trends and changes over these 10 years. Results: We identified 265 268 eligible trauma patients. Excluding those under 65 years old and those with inadequate or unknown age data, missing prognosis, out-of-hospital cardiac arrest, and burns, 107 766 patients were enrolled in this study. The total trauma patient in-hospital mortality trend was evaluated using the Cochran-Armitage test and showed a significant decrease (p<0.001). Although severe trauma patients (Injury Severity Score (ISS) ≥16) showed a significant decreasing trend (p<0.001) over time (from 26.1% to 14.5%), less-severe trauma patients (ISS <16) did not (p=0.41) (from 2.7% to 2.1%). Mixed logistic regression analysis showed that the number of year patients stayed in the hospital was significantly associated with mortality. Conclusions: While recognizing the limitations of the current analysis, our data demonstrated that prognoses for severe trauma patients over 65 years old improved dramatically over these 10 years, especially in those with severe trauma. Level of evidence: Ⅲ-retrospective cohort study.

Retrospective study of thoracic endovascular aortic repair as a first-line treatment for traumatic blunt thoracic aortic injury.

OBJECTIVE: This study sought to confirm if thoracic endovascular aortic repair (TEVAR) was an appropriate therapeutic strategy for blunt thoracic aortic injury (BTAI). METHODS: Between 3/2005 and 12/2020, 104 patients with BTAI were brought to our hospital. The severity of each trauma case was evaluated using the Injury Severity Score (ISS); aortic injuries were classified as type I to IV according to Society for Vascular Surgery guidelines. Initial treatment was categorized into four groups: nonoperative management (NOM), open aortic repair (OAR), TEVAR, or emergency room thoracotomy/cardiopulmonary resuscitation (ERT/CPR). RESULTS: The patients' mean age and ISS were 56.7 ± 20.9 years and 48.3 ± 20.4, respectively. Type III or IV aortic injury were diagnosed in 82 patients. The breakdown of initial treatments was as follows: NOM for 28 patients, OAR for four, TEVAR for 47, and ERT/CPR for 25. The overall early mortality rate was 32.7%. Logistic regression analysis confirmed ISS > 50 and shock on admission as risk factors for early mortality. The cumulative survival rate of all patients was 61.2% at 5 years after treatment. After initial treatment, eight patients receiving TEVAR required OAR. The cumulative rate of freedom from reintervention using TEVAR at 5 years was higher in approved devices than in custom-made devices (96.0 vs. 56.3%, p = 0.011). CONCLUSIONS: Using TEVAR as an initial treatment for patients with BTAI is a reasonable approach. Patients with severe multiple traumas and shock on admission had poor early outcomes, and those treated with custom-made devices required significant rates of reintervention.

Successful interhospital transfer for extracorporeal cardiopulmonary resuscitation of a patient who had a cardiac arrest after cesarean section.

BACKGROUND: Studies describing the effectiveness of extracorporeal cardiopulmonary resuscitation (ECPR) for peripartum cardiopulmonary arrest are lacking. CASE PRESENTATION: A 39-year-old woman underwent elective cesarean section. Right after surgery, she fell into a cardiac arrest and was promptly transferred to our institute by ambulance. On arrival, we immediately initiated ECPR, within 63 min of the cardiac arrest. Return of spontaneous circulation was achieved 80 min after induction of extracorporeal membrane oxygenation. As the hemodynamics of the patient stabilized, extracorporeal membrane oxygenation was discontinued on day 3 of hospitalization. The patient's cerebral performance category score was 3 at discharge, which improved to 2 after 3 months. CONCLUSION: This case suggests that prompt interhospital transfer and ECPR might be effective for peripartum cardiac arrest due to nonhemorrhagic events.

Association Between Converting Asystole From Initial Shockable ECG Rhythm Before Extracorporeal Cardiopulmonary Resuscitation and Outcome.

BACKGROUND: Initial electrocardiogram (ECG) rhythm is a predictor of outcomes in out-of-hospital cardiac arrest (OHCA) in patients receiving extracorporeal cardiopulmonary resuscitation (ECPR). However, ECG rhythm often changes before ECPR, and the consequence of this change remains unclear. This study aimed to assess the relationship between the conversion of ECG rhythm from initial shockable rhythm before ECPR and mortality. PATIENTS AND METHODS: This was a retrospective cohort study of OHCA patients with initial shockable rhythm who underwent ECPR between January 2010 and September 2020. Patients were classified into two groups: asystole (patients whose ECG rhythm converted to asystole at any time before initiating ECPR) and non-asystole (patients whose ECG rhythm did not convert to asystole at any time before initiating ECPR) groups. The primary outcome was in-hospital mortality. RESULTS: A total of 102 patients were included in the study; in-hospital mortality rate was 46.1% (n = 47) and 76 (74.5%) patients had unfavorable neurological outcomes (Cerebral Performance Category: 3-5). There were 33 and 69 patients in the asystole and non-asystole groups, respectively. The mortality rates in the asystole and non-asystole groups were 69.7% and 34.8%, respectively (P = 0.001). On multivariable analysis, the asystole group showed a significant association with mortality (odds ratio, 5.42; 95% confidence interval, 2.11-15.36; P < 0.001). CONCLUSION: Conversion to asystole before ECPR at any time in patients with OHCA is associated with mortality in patients with an initial shockable ECG rhythm.

Retro-odontoid pseudotumor with uncommon presentation of cervical spine injury.

BACKGROUND: We report the first case of retro-odontoid pseudotumor with an isolated symptom of C2-C3 dysesthesia triggered by a traumatic event. CASE PRESENTATION: An 86-year-old man, who was a wood craftsman for more than 50 years, presented to the emergency room with sudden-onset severe posterior head and neck dysesthesia after accidentally falling backward. No neurological impairment of the extremities was noted. Computed tomography revealed a C2-C7 osteophyte formation, mainly in front of the vertebral bodies. Moreover, magnetic resonance imaging showed cervical spinal cord compression by a soft tissue mass posterior to the odontoid process of the axis. Therefore, we diagnosed a cervical spine injury with an isolated symptom of C2-C3 dysesthesia due to a retro-odontoid pseudotumor. He did not undergo surgical intervention and was transferred to a rehabilitation hospital on day 11 for pain control. CONCLUSION: Our report could be useful to emergency physicians dealing with similar cases of cervical symptoms following trauma.

Prehospital management of a non-intubated inhalation injury patient using transcutaneous monitoring of carbon dioxide.

A 46-year-old man experienced facial burns due to a fire in his house. In the prehospital setting, suspecting inhalation injury and carbon monoxide poisoning, an emergency physician decided to bring him to the hospital for carbon dioxide (CO2) monitoring without endotracheal intubation for approximately 20 min because of less severe respiratory distress. On the way to the hospital, the patient's end-tidal CO2 monitoring ranged from 19 to 30 mm Hg, and transcutaneous carbon dioxide (TcPCO2) remained between 50 and 55 mm Hg. On arrival at the hospital, PaCO2 showed 51.6 mm Hg. Endotracheal intubation using a bronchoscope was performed in the emergency room, and inhalation injury was observed. He was extubated on day 5 and discharged on day 10. In the prehospital setting, TcPCO2 monitoring is useful for initial management of non-intubated inhalation injury patients even with high concentration oxygen.