Thoracic Injury in Patients Injured by Explosions on the Battlefield and in Terrorist Incidents

Blast injuries: The experience of a level 1 trauma center

BACKGROUND

There is a global surge in blast injuries, which are associated with high morbidity and mortality. To our knowledge, there are no guidelines for the management of blast injuries in the trauma bay.

METHODS

This single-center retrospective cohort study utilized data on all patients admitted to our emergency department (ED) with terror- or combat-related injuries between October 7, 2023 (Gaza Iron Swords War onset) and February 4, 2024. The primary outcome was trauma severity indicated by either an injury severity score (ISS) >15 and/or need for acute care. We also analyzed the mechanisms of injuries, focusing on those resulting from blasts.

RESULTS

Of 208 patients who were admitted following terror-and combat related injuries, 109 patients (101 males [93 %], median age 24.0 years) were admitted following blast injuries. Of them, 88 % were military personnel and 12 % were civilians, with a median ISS of 8 [IQR:4.0-17.0]. The level of trauma was severe in 48 patients (44 %). Tertiary sub-category of blast injuries (P =0.004), chest (P =0.032), abdomen (P =0.018), and lower extremities (P =0.044) injuries were significantly associated with severe trauma. Blast injuries mandated the urgent availability of specialist personnel and appropriate equipment to contend with multiple life-threatening sequelae of exposure to blasts upon the arrival of the victims to emergency services.

CONCLUSION

Blast injuries present unique challenges in management and demand a multidisciplinary approach and specialized resources. We present an algorithm for terror- and combat-related blast injuries treated in our trauma bay. The step-by-step procedures may be applicable to any blast injury sustained under variable conditions.

Emergency Operable Traumatic Pulmonary Injury at a Level 1 Trauma Center: A Retrospective Descriptive Study

INTRODUCTION

Despite the use of body armor, emergency operable pulmonary trauma (EOPT) remains a major cause of battlefield morbidity and mortality. While EOPT during military conflicts has some features that distinguish it from EOPT in civilian settings, the 2 occurrences demonstrate overall parallel findings related to presentation, management, and outcome. The goals of the present study were to provide a descriptive analysis of the nature of EOPT and its management at a level 1 trauma center and to determine the associations between EOPT patient demographics and/or patient management and outcome in order to better understand battlefield EOPT.

MATERIALS AND METHODS

This is a retrospective, descriptive analysis of EOPT at a level 1 trauma center during a recent 9-year period (2012-2020). The Oregon Health & Science University Trauma Registry was searched, and 106 patients met inclusion criteria for the study. Patients with primary cardiac trauma were excluded. Individual electronic medical records were reviewed to obtain descriptive data, and associations were evaluated for statistical significance.

RESULTS

In-hospital mortality in this cohort was 17.0%. The most common pulmonary injury associated with EOPT was unilateral diaphragmatic laceration (62.3%), and the most common single operation performed for EOPT was a laparotomy (71.7%) often involving diaphragmatic repair. In the remaining instances of EOPT, a thoracotomy (11.3%), a thoracotomy and a laparotomy (10.4%), or another surgery (6.6%) occurred. The primary indication for EOPT surgery was uncontrolled hemorrhage, and one-third of patients received massive transfusion. One-lung ventilation (OLV) was infrequently employed (8.5%). When OLV was used, it was equally likely to involve a single-lumen endotracheal tube (SLETT) with mainstem bronchus insertion, a SLETT with a bronchial blocker, or a double-lumen endotracheal tube. Time from EOPT to operating room arrival was inversely related to in-hospital mortality. Also, both initial in-hospital endotracheal intubation and low injury severity score were strongly associated with survival in the population studied.

CONCLUSIONS

The most common indication for EOPT surgery was uncontrolled hemorrhage. The most frequent operation performed for this EOPT cohort was a laparotomy for diaphragmatic repair. A total of 91.5% of EOPT surgery was performed without OLV, an unexpected finding. When OLV occurred, it was equally likely to involve an SLETT with mainstem bronchus insertion, an SLETT with bronchial blocker, or a double-lumen endotracheal tube. The most common indication for OLV was surgical exposure. More extensive injury (expressed as an injury severity score), preadmission endotracheal intubation, and a shorter time from EOPT to operating room arrival were associated with increased odds ratios for mortality. A better understanding of the nature of EOPT at a civilian level 1 trauma center can serve to identify conditions that are associated with more favorable outcomes for EOPT under battlefield conditions and thereby assist in both management decisions and to help prognosticate and triage severely injured patients in that setting.

Hydrochloric Acid-Induced Acute Lung Injury Models: Dynamic Change and Quantitative Analysis of Modified Lung Ultrasound Scoring System and High-Resolution Computed Tomography

OBJECTIVE

Acute lung injury (ALI) has become a research hotspot due to its significant public health impact. To explore the value of the use of modified lung ultrasound (MLUS) scoring system for evaluating ALI using a rabbit model of ALI induced by hydrochloric acid (HCl) and investigate its correlation with high-resolution computed tomography (HRCT) and histopathological scores.

METHODS

Twenty New Zealand laboratory rabbits were randomly assigned to control group (N = 5) and 3 experimental groups (N = 5 each). The control group received instillation of physiological saline, while the 3 experimental groups received 2 mL/kg of different doses of HCl instillation (mild group: pH 1.5, moderate group: pH 1.2, and severe group: pH 1.0) through the trachea under ultrasound guidance. Pulmonary ultrasound (using Mindray Reason9 linear array probes with frequency of 6-15 mHz) and HRCT examinations were performed before modeling (0H) and at 1H, 2H, 4H, 8H, 12H after modeling. The experimental rabbits were sacrificed at 12H for examination of gross lung morphology and hematoxylin-eosin-stained histopathological sections. The correlation of MLUS scores with HRCT/histopathological scores was assessed.

RESULTS

All rabbits in the experimental groups showed oxygenation index PaO₂/FiO₂<300. Successful establishment of ALI model was proven by autopsy (successful modeling rate: 100%). The pathological damage increased with increase in HCl dosage. MLUS scores showed a positive correlation with HRCT scores/pathological severity. There was a strong positive correlation between MLUS scores and histopathological scores (r = 0.963, p < 0.05) as well as between HRCT scores and histopathological scores (r = 0.932, p < 0.05).

CONCLUSION

Transtracheal injection of different dosages of HCl under ultrasound guidance induced different degrees of ALI. The MLUS scoring system can be used for semiquantitative evaluation of ALI, and is suitable as a screening tool.

Effects and mechanisms of extremely cold environment on body response after trauma

With the outbreak of the Ukrainian crisis, extremely cold environment warfare has once again become the focus of international attention. People exposed to extremely cold environments may suffer from cold damage, further aggravate trauma, trigger high disability and mortality rates, and even cause serious sequelae. To declare the effects and mechanisms of the extremely cold environment on the body after trauma, this paper reviews, firstly, physiological reaction of human body in an extremely cold environment. Then, the post-traumatic body response in an extremely cold environment was introduced, and finally, the sequelae of trauma in extremely cold environment was further summarized in the paper. The results indicated that extremely cold environment can cause a series of damage to the body, especially the body after trauma. The extremely cold factor is a double-edged sword, showing a favorable and unfavorable side in different aspects. Moreover, in addition to the trauma suffered by the body, the subsequent sequelae such as cognitive dysfunction, anxiety, depression and even post-traumatic stress disorder may also be induced. The paper summarizes the human body's physiological response in an extremely cold environment, and declares the effects and mechanisms of the extremely cold environment on the body after trauma, which may provide a theoretical basis for effectively improving the level of combat trauma treatment in extremely cold regions.

A review of the utility of high-frequency oscillatory ventilation in burn and trauma ICU patients

PURPOSE OF REVIEW

The purpose was to examine the utility of high-frequency oscillatory ventilation (HFOV) in trauma and burn ICU patients who require mechanical ventilation, and provide recommendations on its use.

RECENT FINDINGS

HFOV may be beneficial in burn patients with smoke inhalation injury with or without acute lung injury/acute respiratory distress syndrome (ARDS), as it improves oxygenation and minimizes ventilator-induced lung injury. It also may have a role in improving oxygenation in trauma patients with blast lung injury, pulmonary contusions, pneumothorax with massive air leak, and ARDS; however, the mortality benefit is unknown.

SUMMARY

Although some studies have shown promise and improved outcomes associated with HFOV, we recommend its use as a rescue modality for patients who have failed conventional ventilation.

Ex Vivo Pulmonary Oedema after In Vivo Blast-Induced Rat Lung Injury: Time Dependency, Blast Intensity and Beta-2 Adrenergic Receptor Role

Objective: Current treatments for blast-induced lung injury are limited to supportive procedures including mechanical ventilation. The study aimed to investigate the role of post-trauma-induced oedema generation in the function of time and trauma intensity and the probable role of beta 2-adrenergic receptors (β2-ARs) agonists on pulmonary oedema. The study is conducted using an ex vivo model after an experimental in vivo blast-induced thorax trauma in rats. Methods: Rats were randomised and divided into two groups, blast and sham. The blast group were anaesthetised and exposed to the blast wave (3.16 ± 0.43 bar) at a distance of 3.5 cm from the thorax level. The rats were sacrificed 10 min after the blast, the lungs explanted and treated with terbutaline, formoterol, propranolol or amiloride to assess the involvement of sodium transport. Other groups of rats were exposed to distances of 5 and 7 cm from the thorax to reduce the intensity of the injury. Further, one group of rats was studied after 180 min and one after 360 min after a 3.5 cm blast injury. Sham controls were exposed to identical procedures except for receiving blast overpressure. Results: Lung injury and oedema generation depended on time after injury and injury intensity. Perfusion with amiloride resulted in a further increase in oedema formation as indicated by weight gain (p < 0.001), diminished tidal volume (Tv) (p < 0.001), and increased airway resistance (p < 0.001). Formoterol caused a significant increase in the Tv (p < 0.001) and a significant decrease in the airway resistance (p < 0.01), while the lung weight was not influenced. Trauma-related oedema was significantly reduced by terbutaline in terms of lung weight gain (p < 0.01), Tv (p < 0.001), and airway resistance (p < 0.01) compared to control blast-injured lungs. Terbutaline-induced effects were completely blocked by the β-receptor antagonist propranolol (p < 0.05). Similarly, amiloride, which was added to terbutaline perfusion, reversed terbutaline-induced weight gain reduction (p < 0.05). Conclusions: β2-adrenoceptor stimulation had a beneficial impact by amiloride-dependent sodium and therefore, fluid transport mechanisms on the short-term ex vivo oedema generation in a trauma-induced in vivo lung injury of rats.

Blast Injury

Acute coronary artery dissection commonly occurs in young women without cardiovascular risk factors. Predisposing factors, including fibromuscular dysplasia or other vasculopathies, have been demonstrated in its etiology. Here we report the case of a 46-year-old-man who presented with left anterior descending coronary artery dissection caused by blast injury after a bomb explosion. (Level of Difficulty: Advanced.)

Damage-Associated Molecular Patterns and Their Signaling Pathways in Primary Blast Lung Injury: New Research Progress and Future Directions

Primary blast lung injury (PBLI) is a common cause of casualties in wars, terrorist attacks, and explosions. It can exist in the absence of any other outward signs of trauma, and further develop into acute lung injury (ALI) or a more severe acute respiratory distress syndrome (ARDS). The pathogenesis of PBLI at the cellular and molecular level has not been clear. Damage-associated molecular pattern (DAMP) is a general term for endogenous danger signals released by the body after injury, including intracellular protein molecules (HMGB1, histones, s100s, heat shock proteins, eCIRP, etc.), secretory protein factors (IL-1β, IL-6, IL-10, TNF-α, VEGF, complements, etc.), purines and pyrimidines and their derived degradation products (nucleic acids, ATP, ADP, UDPG, uric acid, etc.), and extracellular matrix components (hyaluronic acid, fibronectin, heparin sulfate, biglycan, etc.). DAMPs can be detected by multiple receptors including pattern recognition receptors (PRRs). The study of DAMPs and their related signaling pathways, such as the mtDNA-triggered cGAS-YAP pathway, contributes to revealing the molecular mechanism of PBLI, and provides new therapeutic targets for controlling inflammatory diseases and alleviating their symptoms. In this review, we focus on the recent progress of research on DAMPs and their signaling pathways, as well as the potential therapeutic targets and future research directions in PBLI.