Trends in Prehospital Blood, Crystalloid, and Colloid Administration in Accordance With Changes in Tactical Combat Casualty Care Guidelines

ABSTRACT Introduction Hemorrhage is the leading threat to the survival of battlefield casualties. This study aims to investigate the types of fluids and blood products administered in prehospital trauma encounters to discover the effectiveness of Tactical Combat Casualty Care (TCCC) recommendations. Materials and Methods This is a secondary analysis of a previously described dataset from the Department of Defense Trauma Registry with a focus on prehospital fluid and blood administration in conjunction with changes in the TCCC guidelines. We collected demographic information on each patient. We categorized receipt of each fluid type and blood product as a binary variable for each casualty and evaluated trends over 2007–2020 both unadjusted and controlling for injury severity and mechanism of injury. Results Our original dataset comprised 25,897 adult casualties from January 1, 2007 through March 17, 2020. Most (97.3%) of the casualties were male with a median age of 25. Most (95.5%) survived to hospital discharge, and 12.2% of the dataset received fluids of any kind. Medical personnel used crystalloids in 7.4% of encounters, packed red blood cells in 2.0%, and whole blood in 0.5% with very few receiving platelets or freeze-dried plasma. In the adjusted model, we noted significant year-to-year increases in intravenous fluid administration from 2014 to 2015 and 2018 to 2019, with significant decreases noted in 2008–2009, 2010–2012, and 2015–2016. We noted no significant increases in Hextend used, but we did note significant decreases in 2010–2012. For any blood product, we noted significant increases from 2016 to 2017, with decreases noted in 2009–2013, 2015–2016, and 2017–2018. Overall, we noted a general spike in all uses in 2011–2012 that rapidly dropped off 2012–2013. Crystalloids consistently outpaced the use of blood products. We noted a small upward trend in all blood products from 2017 to 2019. Conclusions Changes in TCCC guidelines did not immediately translate into changes in prehospital fluid administration practices. Crystalloid fluids continue to dominate as the most commonly administered fluid even after the 2014 TCCC guidelines changed to use of blood products over crystalloids. There should be future studies to investigate the reasons for delay in guideline implementation and efforts to improve adherence.

Evaluating the Tactical Combat Casualty Care principles in civilian and military settings: systematic review, knowledge gap analysis and recommendations for future research

ObjectivesThe Tactical Combat Casualty Care (TCCC) guidelines detail resuscitation practices in prehospital and austere environments. We sought to review the content and quality of the current TCCC and civilian prehospital literature and characterize knowledge gaps to offer recommendations for future research.MethodsMEDLINE, EMBASE, CINAHL, and Cochrane Central Register of Controlled Trials were searched for studies assessing intervention techniques and devices used in civilian and military prehospital settings that could be applied to TCCC guidelines. Screening and data extraction were performed according to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Quality appraisal was conducted using appropriate tools.ResultsNinety-two percent (n=57) of studies were observational. Most randomized trials had low risk of bias, whereas observational studies had higher risk of bias. Interventions of massive hemorrhage control (n=17) were wound dressings and tourniquets, suggesting effective hemodynamic control. Airway management interventions (n=7) had high success rates with improved outcomes. Interventions of respiratory management (n=12) reported low success with needle decompression. Studies assessing circulation (n=18) had higher quality of evidence and suggested improved outcomes with component hemostatic therapy. Hypothermia prevention interventions (n=2) were generally effective. Other studies identified assessed the use of extended focused assessment with sonography in trauma (n=3) and mixed interventions (n=2).ConclusionsThe evidence was largely non-randomized with heterogeneous populations, interventions, and outcomes, precluding robust conclusions in most subjects addressed in the review. Knowledge gaps identified included the use of blood products and concentrate of clotting factors in the prehospital setting.Level of evidenceSystematic review, level III.

Decision Support for Tactical Combat Casualty Care Using Machine Learning to Detect Shock

ABSTRACT Introduction The emergence of more complex Prolonged Field Care in austere settings and the need to assist inexperienced providers’ ability to treat patients create an urgent need for effective tools to support care. We report on a project to develop a phone-/tablet-based decision support system for prehospital tactical combat casualty care that collects physiologic and other clinical data and uses machine learning to detect and differentiate shock manifestation. Materials and Methods Software interface development methods included literature review, rapid prototyping, and subject matter expert design requirements reviews. Machine learning algorithm methods included development of a model trained on publicly available Medical Information Mart for Intensive Care data, then on de-identified data from Mayo Clinic Intensive Care Unit. Results The project team interviewed 17 Army, Air Force, and Navy medical subject matter experts during design requirements review sessions. They had an average of 17 years of service in military medicine and an average of 4 deployments apiece and all had performed tactical combat casualty care on live patients during deployment. Comments provided requirements for shock identification and management in prehospital settings, including support for indication of shock probability and shock differentiation. The machine learning algorithm based on logistic regression performed best among other algorithms we tested and was able to predict shock onset 90 minutes before it occurred with better than 75% accuracy in the test dataset. Conclusions We expect the Trauma Triage, Treatment, and Training Decision Support system will augment a medic’s ability to make informed decisions based on salient patient data and to diagnose multiple types of shock through remotely trained, field deployed ML models.

ОСОБЛИВОСТІ РОБОТИ МЕДИЧНИХ СЕСТЕР У ЗОНІ БОЙОВИХ ДІЙ

Забезпечення кожному постраждалому належної медичної допомоги збільшує шанси на виживання та відновлення функцій протягом усього процесу надання медичної допомоги, що зумовлює актуальність аналізу складнощів у виконанні покладених на медсестер обов’язків у зоні бойових дій. Мета дослідження – проаналізувати особливості роботи медичних сестер у зоні ведення бойових дій та на їх основі сформулювати рекомендації щодо удосконалення освітніх навчальних програм для медсестер. Матеріали і методи. На базі військово-медичної служби ВМС УСБУ в Закарпатській області було про­аналізовано анкетні дані медичних сестер, які проходили військову службу в зоні антитерористичної операції упродовж 2015–2017 рр. Основним запитанням до респондентів було коротко описати складнощі у виконанні покладених на медсестер обов’язків. Результати. Аналізуючи отримані відповіді медичних сестер, які виконували свої професійні обов’язки в зоні бойових дій, було сформульовано основні складнощі їх роботи в умовах прямої і непрямої загрози: недостатні знання принципів Tactical Combat Casualty Care; розподіл поранених при евакуації в умовах тактичної екстреної медичної допомоги; різна популяція постраждалих, яка включала не тільки військовослужбовців, а й мирне населення, у тому числі педіатричні й геріатричні вікові групи; необхідність психологічної допомоги військово­службовцям і мирному населенню в зоні бойових дій; недостатній досвід тактичної евакуації. Висновки. Для оптимізації професійних знань медичних сестер у цих напрямках рекомендується включити освітні компоненти «Тактична медицина» і «Екстрена психологічна допомога» в освітні навчальні програми для медсестер.

Implementation and Evaluation of Tactical Combat Casualty Care for Army Aviators

Introduction The importance of developing military strategies to decrease preventable death by mitigating hemorrhage and reducing time between the point of injury and surgical intervention on the battlefield is highlighted in previous studies. Successful implementation of Tactical Combat Casualty Care (TCCC) throughout elements of the USA and allied militaries begins to address this need. However, TCCC implementation is neither even nor complete in the larger, conventional force. Army Aviators are at risk for preventable death as they do not receive prehospital care training and are challenged to render prehospital care in the austere environment of helicopter operations. Army aviators are at risk for preventable death due to the challenges to render prehospital care in the austere environment of helicopter operations. Helicopters often fly at low altitudes, engage in direct action in support of ground troops, operate at a great distance from medical facilities, typically do not have medical personnel onboard, and can have long wait times for medical evacuation services due to the far forward nature of helicopter operations. Materials and Methods This is a quality improvement pre–post-intervention design study evaluating the implementation of a combat casualty care training program for Army aviators using well-established evidence-based guidelines for providing care to casualties on the battlefield. The evaluation consisted of participants’ self-perceived confidence in providing care to a casualty and change in knowledge level in combat casualty care in a pre/post-intervention design. Clinical skills of tourniquet application, nasopharyngeal airway placement, and needle chest decompression were assessed on a pass/fail grading standard. Results A total of 18 participants completed the pre- and post-education surveys. A paired t-test showed a statistically significant increase in total composite scores from pre (M = 24.67, SD = 5.06) to post-education self-efficacy (M = 37.94, SD = 2.10), t (17) = −11.29, p < 0.001. A paired t-test revealed a significant increase in exam scores from pre (M = 70.22, SD = 9.43) to post (M = 87.78, SD = 7.19), t (17) = −7.31, p < 0.001. There was no pre-intervention skills assessment, however, all participants (n = 18, 100%) passed the tourniquet application, needle chest compression, and insertion of nasopharyngeal airway. Conclusion TCCC for Army Aviators is easily implemented, demonstrates an increase in knowledge and confidence in providing prehospital care, and provides effective scenario-based training of necessary psychomotor skills needed to reduce preventable death on the battlefield. TCCC for Army Aviators effectively takes the TCCC for All Combatants curriculum and modifies it to address the unique considerations in treating wounded aviators and passengers, both in flight and after crashes. This project demonstrates on a small scale how TCCC can be tailored to specific military jobs in order to successfully meet the intent of the upcoming All Service Member TCCC course mandated in DoD 1322.24. Beyond Army aviation, this program is easily modifiable for aviators throughout the military and civilian sector.

Managing junctional haemorrhage in the combat environment

Tactical combat casualty care and the application of extremity tourniquets have saved lives in combat. In the modern combat environment junctional injuries are common and difficult to treat. Recently, junctional tourniquets have emerged as a potential solution to this problem. Junctional tourniquets can be used as an adjunct to persistent haemorrhage despite application of conventional tourniquets or in the persistently hypotensive casualty. Surgeons must have an approach to receiving patients with junctional tourniquets in place in the operating room. The algorithms presented allow for an evidence-based and command-driven implantation of junctional tourniquets as part of tactical combat casualty care.