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Pelvic fractures are common in cases of blunt trauma, which is strongly associated with mortality. Transcatheter arterial embolization is a fundamental treatment strategy for fatal arterial injuries caused by blunt pelvic trauma. However, vascular injuries due to blunt pelvic trauma can show various imaging findings other than arterial hemorrhage. We present a pictorial review of common and uncommon vascular injuries, including active arterial bleeding, pseudoaneurysm, arteriovenous fistula, arterial occlusion, vasospasm, and active venous bleeding. Knowledge of these vascular injuries can help clinicians select the appropriate therapeutic strategy and thus save lives., (© 2022. The Author(s).)

Objective: The objective of this study was to determine the association between arterial embolisation (AE) for pelvic fractures and death., Methods: The study had a retrospective design, using data from a nationwide population based prospective registry of trauma patients in Japan. This propensity score matched study included all adult patients from the registry with pelvic fractures between January 2004 and December 2018. The primary outcome was hospital death. Secondary outcomes included 28 day survival and length of hospital stay (LOS) in days. Multivariable logistic regression analyses were performed to control confounding variables, including patient, clinical, and hospital related variables; concomitant trauma; severe trauma; and haemodynamic instability. A conditional logistic regression analysis was performed to assess the association between treatment of pelvic fracture with AE and hospital mortality rate., Results: Among 17 670 eligible patients with pelvic fractures, 2 379 (13.5%) underwent AE (AE group) and 1 512 (8.6%) died in the hospital. After one to one propensity matching with 2 138 patients from each group (AE and non-AE), the hospital mortality rate was significantly lower in the AE group than in the non-AE group (15.0% vs. 18.1%; p = .007). The AE group had significantly lower mortality (odds ratio; 95% confidence interval [CI] 0.60; 0.43 - 0.84; p = .003) and a significantly higher 28 day mean survival rate than the non-AE group (0.89; 95% CI 0.87 - 0.90 vs. 0.86; 0.85 - 0.88; p = .003), although there was no significant difference in the LOS (48 days vs. 46 days; p = .11)., Conclusion: This propensity score matched analysis showed an association between AE for pelvic fractures and lower hospital mortality rates. The findings in this large nationwide cohort study provide strong evidence for the benefit of embolisation for patients with pelvic fractures., (Copyright © 2022 European Society for Vascular Surgery. Published by Elsevier B.V. All rights reserved.)

Resuscitative endovascular balloon occlusion of the aorta (REBOA) is performed in patients with hemorrhagic shock who develop massive subdiaphragmatic bleeding. This procedure enables rapid and less invasive aortic blockade compared to resuscitative thoracotomy and aortic cross-clamp procedures. However, the REBOA procedure is often blindly performed in the emergency department without fluoroscopy, and the appropriateness of the procedure may be evaluated on computed tomography (CT) after REBOA. Therefore, radiologists should be familiar with the imaging features of REBOA. We present a pictorial review of the radiological findings of REBOA along with a description of the procedure, its complications, and pitfalls., (© 2021. The Author(s).)

BACKGROUND Patients with coronavirus disease 2019 (COVID-19) caused by the severe acute respiratory syndrome coronavirus 2 can rapidly progress to acute respiratory distress syndrome (ARDS). Because clinical diagnosis of ARDS includes several diseases, understanding the characteristics of COVID-19-related ARDS is necessary for precise treatment. We report 2 patients with ARDS due to COVID-19-associated pneumonia. CASE REPORT Case 1 involved a 72-year-old Japanese man who presented with respiratory distress and fever. Computed tomography (CT) revealed subpleural ground-glass opacities (GGOs) and consolidation. Six days after symptom onset, reverse transcription-polymerase chain reaction (RT-PCR) testing confirmed the diagnosis of COVID-19-associated pneumonia. He was intubated and received veno-venous extracorporeal membrane oxygenation (ECMO) 8 days after symptom onset. Follow-up CT revealed large diffuse areas with a crazy-paving pattern and consolidation, which indicated progression of COVID-19-associated pneumonia. Following treatment with antiviral medications and supportive measures, the patient was weaned off ECMO after 20 days. Case 2 involved a 70-year-old Asian man residing in Canada who presented with cough, malaise, nausea, vomiting, and fever. COVID-19-associated pneumonia was diagnosed based on a positive result from RT-PCR testing. The patient was then transferred to the intensive care unit and intubated 8 days after symptom onset. Follow-up CT showed that while the initial subpleural GGOs had improved, diffuse GGOs appeared, similar to those observed upon diffuse alveolar damage. He was administered systemic steroid therapy for ARDS and extubated after 6 days. CONCLUSIONS Because the pattern of symptom exacerbation in COVID-19-associated pneumonia cases seems inconsistent, individual treatment management, especially the CT-based treatment strategy, is crucial.

Introduction: Triaging plays an important role in providing suitable care to a large number of casualties in a disaster setting. A Pediatric Physiological and Anatomical Triage Score (PPATS) was developed as a new secondary triage method. This study aimed to validate the accuracy of the PPATS in identifying injured pediatric patients who are admitted at a high frequency and require immediate treatment in a disaster setting. The PPATS method was also compared with the current triage methods, such as the Triage Revised Trauma Score (TRTS)., Methods: A retrospective review of pediatric patients aged ≤15 years, registered in the Japan Trauma Data Bank (JTDB) from 2012 through 2016, was conducted and PPATS was performed. The PPATS method graded patients from zero to 22, and was calculated based on vital signs, anatomical abnormalities, and the need for life-saving interventions. It categorized patients based on their priority, and the intensive care unit (ICU)-indicated patients were assigned a PPATS ≥six. The accuracy of PPATS and TRTS in predicting the outcome of ICU-indicated patients was compared., Results: Of 2,005 pediatric patients, 1,002 (50%) were admitted to the ICU. The median age of the patients was nine years (interquartile range [IQR]: 6-13 years). The sensitivity and specificity of PPATS were 78.6% and 43.7%, respectively. The area under the receiver-operating characteristic (ROC) curve (AUC) was larger for PPATS (0.61; 95% confidence interval [CI], 0.59-0.63) than for TRTS (0.57; 95% CI, 0.56-0.59; P <.01). Regression analysis showed a significant correlation between PPATS and the Injury Severity Score (ISS; r2 = 0.353; P <.001), predicted survival rate (r2 = 0.396; P <.001), and duration of hospital stay (r2 = 0.252; P <.001)., Conclusion: The accuracy of PPATS for injured pediatric patients was superior to that of current secondary triage methods. The PPATS method is useful not only for identifying high-priority patients, but also for determining the priority ranking for medical treatments and evacuation.

Introduction: Because Japan has high suicide rates and low violent crime rates, it is likely that most abdominal stab wounds (ASWs) in Japan are self-inflicted. Although physical examination is one of the most important factors in surgical decision making, such evaluations can be difficult in patients with self-inflicted ASWs due to patient agitation and uncooperative behavior. Therefore, the self-inflicted nature of an injury may strongly affect clinical practice, particularly in Japan, but its influence remains uncertain. We hypothesized that the rates of exploratory laparotomy and nontherapeutic laparotomy (NTL) would be higher in self-inflicted patients., Methods: We reviewed ASW patients from 2004 to 2014 in the Japan Trauma Data Bank. The rates of exploratory laparotomy and NTL were compared between self-inflicted and non-self-inflicted ASWs., Results: Of the 1705 eligible patients, 1302 patients (76.4%) had self-inflicted ASWs, and 403 patients (23.6%) had non-self-inflicted ASWs. Self-inflicted patients had a significantly higher rate of psychiatric history, but lower injury severity. The in-hospital mortality rate was similar between the two groups (4.5% vs. 5.2%, p = 0.576). Self-inflicted patients had significantly higher rates of exploratory laparotomy and NTL (69.1% vs. 56.7%, p < 0.001, 22.5% vs. 13.6%, p = 0.03, respectively). Self-inflicted patients were also associated with significantly longer hospital stays (10.0 [5.0-21.0] vs. 9.0 [4.0-18.0] days, P = 0.045). In a multivariable analysis, self-inflicted patients were independently associated with exploratory laparotomy (odds ratio [OR], 2.05; 95% confidence interval [CI]: 1.55-2.72) and NTL (OR, 1.61; 95% CI: 1.01-2.56)., Conclusion: ASWs in Japan were predominantly self-inflicted. The clinical patterns of self-inflicted ASWs had some unique features. Patients with self-inflicted ASWs had higher rates of laparotomy and NTL. Further studies are needed to develop a useful protocol specific to self-inflicted ASWs., (Copyright © 2018 Elsevier Ltd. All rights reserved.)

Background: To improve acute trauma care workflow, the number of trauma centers equipped with a computed tomography (CT) machine in the trauma resuscitation room has increased. The effect of the presence of a CT machine in the trauma room on a patient's outcome is still unclear. This study evaluated the association between a CT machine in the trauma room and a patient's outcome., Methods: Our study included all trauma patients admitted to a trauma center in Yokohama, Japan, between April 2014 and March 2016. We compared 140 patients treated using a conventional resuscitation room with 106 patients treated in new trauma rooms equipped with a CT machine., Results: For the group treated in a trauma room with a CT machine, the Injury Severity Score (13.0 vs. 9.0; p  = 0.002), CT scans of the head (78.3 vs. 66.4%; p  = 0.046), CT scans of the body trunk (75.5 vs. 58.6%; p  = 0.007), intubation in the emergency department (48.1 vs. 30.7%; p  = 0.008), and multiple trauma patients (47.2 vs. 30.0%; p  = 0.008) were significantly higher and Trauma and Injury Severity Score probability of survival (96.75 vs. 97.80; p  = 0.009) was significantly lower than the group treated in a conventional resuscitation room. In multivariate analysis and propensity score matched analysis, being treated in a trauma room with a CT machine was an independent predictor for fewer hospital deaths (odds ratio 0.002; 95% CI 0.00-0.75; p  = 0.04, and 0.07; 0.00-0.98, respectively)., Conclusions: Equipping a trauma room with a CT machine reduced the time in decision-making for treating a trauma patient and subsequently lowered the mortality of trauma patients., Competing Interests: This study was approved by the ethics committee of YCUMC. The ethics committee at our institution does not require informed consent for observational studies using anonymous data previously collected for routine operations. The reference number is B170400019.This study was an observational study. Thus, obtaining a consent from a patient was waved by the institutional review board.The authors declare that they have no competing interests.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Background: Hyperfibrinolysis is a critical complication in severe trauma. Hyperfibrinolysis is traditionally diagnosed via elevated D-dimer or fibrin/fibrinogen degradation product levels, and recently, using thromboelastometry. Although hyperfibrinolysis is observed in patients with severe isolated traumatic brain injury (TBI) on arrival at the emergency department (ED), it is unclear which factors induce hyperfibrinolysis. The present study aimed to investigate the factors associated with hyperfibrinolysis in patients with isolated severe TBI., Methods: We conducted a multicentre retrospective review of data for adult trauma patients with an injury severity score ≥ 16, and selected patients with isolated TBI (TBI group) and extra-cranial trauma (non-TBI group). The TBI group included patients with an abbreviated injury score (AIS) for the head ≥ 4 and an extra-cranial AIS < 2. The non-TBI group included patients with an extra-cranial AIS ≥ 3 and head AIS < 2. Hyperfibrinolysis was defined as a D-dimer level ≥ 38 mg/L on arrival at the ED. We evaluated the relationships between hyperfibrinolysis and injury severity/tissue injury/tissue perfusion in TBI patients by comparing them with non-TBI patients., Results: We enrolled 111 patients in the TBI group and 126 in the non-TBI group. In both groups, patients with hyperfibrinolysis had more severe injuries and received transfusion more frequently than patients without hyperfibrinolysis. Tissue injury, evaluated on the basis of lactate dehydrogenase and creatine kinase levels, was associated with hyperfibrinolysis in both groups. Among patients with TBI, the mortality rate was higher in those with hyperfibrinolysis than in those without hyperfibrinolysis. Tissue hypoperfusion, evaluated on the basis of lactate level, was associated with hyperfibrinolysis in only the non-TBI group. Although the increase in lactate level was correlated with the deterioration of coagulofibrinolytic variables (prolonged prothrombin time and activated partial thromboplastin time, decreased fibrinogen levels, and increased D-dimer levels) in the non-TBI group, no such correlation was observed in the TBI group., Conclusions: Hyperfibrinolysis is associated with tissue injury and trauma severity in TBI and non-TBI patients. However, tissue hypoperfusion is associated with hyperfibrinolysis in non-TBI patients, but not in TBI patients. Tissue hypoperfusion may not be a prerequisite for the occurrence of hyperfibrinolysis in patients with isolated TBI.

To improve the efficiency of photoinduced charge separation on the surface of dye-sensitized TiO 2 nanoparticles, we synthesized the Ru(II)-photosensitizer-immobilized, Pt-cocatalyst-loaded TiO 2 nanoparticles RuCP 2 @Pt-TiO 2 , RuCP 2 -Zr- RuP 6 @Pt-TiO 2 , and RuCP 2 -Zr- RuP 4 -Zr- RuP 6 @Pt-TiO 2 ( RuCP 2 = [Ru(bpy) 2 (mpbpy)] 2- , RuP 4 = [Ru(bpy)(pbpy) 2 ] 6- , RuP 6 = [Ru(pbpy) 3 ] 10- , H 4 mpbpy = 2,2'-bipyridine-4,4'-bis(methanephosphonic acid), and H 4 pbpy = 2,2'-bipyridine-4,4'-bis(phosphonic acid)) using phosphonate linkers with bridging Zr 4+ ions. X-ray fluorescence and ultraviolet-visible absorption spectra revealed that a layered molecular structure composed of Ru(II) photosensitizers and Zr 4+ ions (i.e., RuCP 2 -Zr- RuP 6 and RuCP 2 -Zr- RuP 4 -Zr- RuP 6 ) was successfully formed on the surface of Pt-TiO 2 nanoparticles, which increased the surface coverage from 0.113 nmol/cm 2 for singly layered RuCP 2 @Pt-TiO 2 to 0.330 nmol/cm 2 for triply layered RuCP 2 -Zr- RuP 4 -Zr- RuP 6 @Pt-TiO 2 . The photocatalytic H 2 evolution activity of the doubly layered RuCP 2 -Zr- RuP 6 @Pt-TiO 2 was three times higher than that of the singly layered RuCP 2 @Pt-TiO 2 , whereas the activity of triply layered RuCP 2 -Zr- RuP 4 -Zr- RuP 6 @Pt-TiO 2 was less than half of that for RuCP 2 @Pt-TiO 2 . The photosensitizing efficiencies of these Ru(II)-photosensitizer-immobilized nanoparticles for the O 2 evolution reaction catalyzed by the Co(II)-containing Prussian blue analogue [Co II (H 2 O) 2 ] 1.31 [{Co III (CN) 6 } 0.63 {Pt II (CN) 4 } 0.37 ] decreased as the number of Ru(II)-photosensitizing layers increased. Thus, crucial aspects of the energy- and electron-transfer mechanism for the photocatalytic H 2 and O 2 evolution reactions involve not only the Ru(II)-complex-TiO 2 interface but also the multilayered structure of the Ru(II)-photosensitizers on the Pt-TiO 2 surface., Competing Interests: The authors declare no competing financial interest.

Introduction: In the early phase of trauma, fibrinogen (Fbg) plays an important role in clot formation. However, to the best of our knowledge, few studies have analysed methods of predicting the need for massive transfusion (MT) based on Fbg levels using multiple logistic regression. Therefore, the present study aimed to evaluate whether Fbg levels on admission can be used to predict the need for MT in patients with trauma., Methods: We conducted a retrospective multicentre observational study. Patients with blunt trauma with ISS ≥16 who were admitted to 15 tertiary emergency and critical care centres in Japan participating in the J-OCTET were enrolled in the present study. MT was defined as the transfusion of packed red blood cells (PRBC) ≥10 units or death caused by bleeding within 24h after admission. Patients were divided into non-MT and MT groups. Multiple logistic-regression analysis was used to assess the predictive value of the variables age, sex, vital signs, Glasgow Coma Scale (GCS) score, and Fbg levels for MT. We also evaluated the discrimination threshold of MT prediction via receiver operating characteristic curve (ROC) analysis for each variable., Results: Higher heart rate (HR; per 10 beats per minutes [bpm]), systolic blood pressure (SBP; per 10mm Hg), GCS, and Fbg levels (per 10mg/dL) were independent predictors of MT (odds ratio [OR] 1.480, 95% confidence interval [CI] 1.326-1.668; OR 0.851, 95% CI 0.789-0.914; OR 0.907, 95% CI 0.855-0.962; and OR 0.931, 95% CI 0.898-0.963, respectively). The optimal cut-off values for HR, SBP, GCS, and Fbg levels were ≥100 bpm (sensitivity 62.4%, specificity 79.8%), ≤120mm Hg (sensitivity 61.5%, specificity 70.5%), ≤12 points (sensitivity 63.3%, specificity 63.6%), and ≤190mg/dL (sensitivity 55.1%, specificity 78.6%), respectively., Conclusions: Our findings suggest that vital signs, GCS, and decreased Fbg levels can be regarded as predictors of MT. Therefore, future studies should consider Fbg levels when devising models for the prediction of MT., (Copyright © 2017 Elsevier Ltd. All rights reserved.)

Objectives: To evaluate the utility of the conventional lethal triad in current trauma care practice and to develop novel criteria as indicators of treatment strategy., Design: Retrospective observational study., Settings: Fifteen acute critical care medical centers in Japan., Patients: In total, 796 consecutive trauma patients who were admitted to emergency departments with an injury severity score of greater than or equal to 16 from January 2012 to December 2012., Interventions: None., Measurements and Main Results: All data were retrospectively collected, including laboratory data on arrival. Sensitivities to predict trauma death within 28 days of prothrombin time international normalized ratio greater than 1.50, pH less than 7.2, and body temperature less than 35°C were 15.7%, 17.5%, and 15.9%, respectively, and corresponding specificities of these were 96.4%, 96.6%, and 93.6%, respectively. The best predictors associated with hemostatic disorder and acidosis were fibrin/fibrinogen degradation product and base excess (the cutoff values were 88.8 µg/mL and -3.05 mmol/L). The optimal cutoff value of hypothermia was 36.0°C. The impact of the fibrin/fibrinogen degradation product and base excess abnormality on the outcome were approximately three- and two-folds compared with those of hypothermia. Using these variables, if the patient had a hemostatic disorder alone or a combined disorder with acidosis and hypothermia, the sensitivity and specificity were 80.7% and 66.8%., Conclusions: Because of the low sensitivity and high specificity, conventional criteria were unsuitable as prognostic indicators. Our revised criteria are assumed to be useful for predicting trauma death and have the potential to be the objective indicators for activating the damage control strategy in early trauma care.

Elevated D-dimer level in trauma patients is associated with tissue damage severity and is an indicator of hyperfibrinolysis during the early phase of trauma. To investigate the interacting effects of fibrinogen and D-dimer levels on arrival at the emergency department for massive transfusion and mortality in severe trauma patients in a multicenter retrospective study. This study included 519 adult trauma patients with an injury severity score ≥16. Patients with ≥10 units of red cell concentrate transfusion and/or death during the first 24 h were classified as having a poor outcome. Receiver operating characteristic curve analysis for predicting poor outcome showed the optimal cut-off fibrinogen and D-dimer values to be 190 mg/dL and 38 mg/L, respectively. On the basis of these values, patients were divided into four groups: low D-dimer (<38 mg/L)/high fibrinogen (>190 mg/dL), low D-dimer (<38 mg/L)/low fibrinogen (≤190 mg/dL), high D-dimer (≥38 mg/L)/high fibrinogen (>190 mg/dL), and high D-dimer (≥38 mg/L)/low fibrinogen (≤190 mg/dL). The survival rate was lower in the high D-dimer/low fibrinogen group than in the other groups. Moreover, the survival rate was lower in the high D-dimer/high fibrinogen group than in the low D-dimer/high fibrinogen and low D-dimer/low fibrinogen groups. High D-dimer level on arrival is a strong predictor of early death or requirement for massive transfusion in severe trauma patients, even with high fibrinogen levels.

Compared to conventional visual- and auditory-based assisted driving technologies, haptic modality promises to be more effective and less disturbing assistance to the driver. However, in most previous studies, haptic assistance systems were evaluated from safety and stability viewpoints. Moreover, the effect of haptic assistance on human driving behavior has not been sufficiently discussed. In this paper, we introduce an assisted driving method based on haptic assistance for driver training in reverse parking, which is considered as an uncertain factor in conventional assisted driving systems. The proposed system assists the driver by applying a torque on the steering wheel to guide proper and well-timed steering. To design the appropriate assistance method, we conducted a measurement experiment to determine the qualitative reverse parking driver characteristics. Based on the determined characteristics, we propose a haptic assistance calculation method that utilizes the receding horizon control algorithm. For a simulation environment to assess the proposed assistance method, we also developed a scaled car simulator comprising a 1/10 scaled robot car and an omnidirectional camera. We used the scaled car simulator to conduct comparative experiments on subjects, and observed that the driving skills of the assisted subjects were significantly better than those of the control subjects.