Military Medical Evacuation After the Benghazi Embassy Attack: Implications for Military Support of Diplomatic Missions

BACKGROUND

The Department of State has the primary responsibility of diplomatic operations in foreign countries. The US military often supports these missions and, when needed, may be called upon to provide security in the event of changes in the host nation's government stability. The US military was requested to help evacuate the consulate in Benghazi after the attack on September 11, 2012. The medical requirements to support such a mission remain unclear, and data are lacking. We sought to describe the medical care required during this evacuation mission.

METHODS

This is a secondary analysis of a previously described dataset from the United States Transportation Command (TRANSCOM) Regulating Command & Control and Evacuation System (TRAC2ES) from 2008 to 2018, with a focus on cases involving the evacuation after the Libyan consulate attack in September 2012. Within our dataset, we isolated all cases of evacuation from the attack on US government facilities in Benghazi. We describe the available data within TRAC2ES, including the free text information placed by the initiating medical personnel.

RESULTS

We identified three cases of evacuations within TRAC2ES associated with the Benghazi consulate attack. All cases were evacuated from host nation hospitals to Landstuhl Regional Medical Center (LRMC) by military aircraft under urgent status. Case 1 was an adult male injured by an undocumented mechanism. He was found to be in severe shock, received four units of blood prior to transport, and was intubated. Case 2 was an adult male injured by an undocumented mechanism. He had documented smoke inhalation injury and was found to be coughing up black sputum. Case 3 was an adult male injured by an undocumented mechanism. He had a compound radial fracture with an external fixator in place and subsequently developed compartment syndrome. He was intubated prior to transport.

CONCLUSIONS

Our case series focuses on the unique aspects of military support of diplomatic missions in countries lacking a stable government-specifically, what transpired in Benghazi. Such events showcase areas of potential collaboration between the Department of State and the Department of Defense in coordinating medical evacuations for casualties sustained during diplomatic missions.

The epidemiology and outcomes of prolonged trauma care (EpiC) study: methodology of a prospective multicenter observational study in the Western Cape of South Africa

Background

Deaths due to injuries exceed 4.4 million annually, with over 90% occurring in low-and middle-income countries. A key contributor to high trauma mortality is prolonged trauma-to-treatment time. Earlier receipt of medical care following an injury is critical to better patient outcomes. Trauma epidemiological studies can identify gaps and opportunities to help strengthen emergency care systems globally, especially in lower income countries, and among military personnel wounded in combat. This paper describes the methodology of the “Epidemiology and Outcomes of Prolonged Trauma Care (EpiC)” study, which aims to investigate how the delivery of resuscitative interventions and their timeliness impacts the morbidity and mortality outcomes of patients with critical injuries in South Africa.

Methods

The EpiC study is a prospective, multicenter cohort study that will be implemented over a 6-year period in the Western Cape, South Africa. Data collected will link pre- and in-hospital care with mortuary reports through standardized clinical chart abstraction and will provide longitudinal documentation of the patient’s clinical course after injury. The study will enroll an anticipated sample of 14,400 injured adults. Survival and regression analysis will be used to assess the effects of critical early resuscitative interventions (airway, breathing, circulatory, and neurologic) and trauma-to-treatment time on the primary 7-day mortality outcome and secondary mortality (24-h, 30-day) and morbidity outcomes (need for operative interventions, secondary infections, and organ failure).

Discussion

This study is the first effort in the Western Cape of South Africa to build a standardized, high-quality, multicenter epidemiologic trauma dataset that links pre- and in-hospital care with mortuary data. In high-income countries and the U.S. military, the introduction of trauma databases and registries has led to interventions that significantly reduce post-injury death and disability. The EpiC study will describe epidemiology trends over time, and it will enable assessments of how trauma care and system processes directly impact trauma outcomes to ultimately improve the overall emergency care system.

Trial Registration: Not applicable as this study is not a clinical trial.

Incidence of post-traumatic seizures in children during combat operations in Afghanistan and Iraq

OBJECTIVES

Children represent a significant portion of the patient population treated at combat support hospitals. There is significant data regarding post injury seizures in adults but with children it is lacking. We seek to describe the incidence of post-traumatic seizures within this population.

METHODS

This is a secondary analysis of previously described data from the Department of Defense Trauma Registry (DODTR). Within our dataset, we searched for documentation of seizures after admission.

RESULTS

Of the 3439 encounters in our dataset, we identified 37 casualties that had a documented seizure after admission. Most were in the 1-4 year age group (37.8%), male (59.4%), injured by explosive (40.5%), with serious injuries to the head/neck (75.6%). The median ISS was higher in the seizure group (22 versus 10, p<0.001). Most survived to hospital discharge with no statistically significant increased mortality noted in the seizure group (seizure 90.2% versus 91.8%, p = 1.000). In the prehospital setting, the seizure group was more frequently intubated (16.2% versus 6.0%, p = 0.023), received ketamine (20.0% versus 3.2%, p<0.001), and administered an anti-seizure medication (5.4% versus 0.1%, p = 0.001). In the hospital setting, the seizure group was more frequently intubated (56.7% versus 17.7%, p<0.001), had intracranial pressure monitoring (24.3% versus 2.6%, p<0.001), craniectomy (10.8% versus 2.5%, p = 0.014), and craniotomy (21.6% versus 4.7%, p<0.001).

CONCLUSIONS

Within our dataset, we found an incidence of 1% of pediatric casualties experiencing a post-traumatic seizure. While this number appears infrequent, there is likely significant under detection of subclinical seizures.

Hypothermia in the Combat Trauma Population

BACKGROUND

The MARCH (Massive hemorrhage, Airway, Respirations, Circulation, and Hypothermia/Head injuries) algorithm taught to military medics includes interventions to prevent hypothermia. As possible sequelae from major trauma, hypothermia is associated with coagulopathy and lower survival. This paper sought to define hypothermia within our combat trauma population using an outcomes-based method, and determine clinical variables associated with hypothermia.

METHODS

This is a secondary analysis of a previously described dataset from the Department of Defense Trauma Registry focused on casualties who received prehospital care. A receiver operating curve was constructed and Youden's index was used to define hypothermia within the predetermined population based on mortality risk. A multivariable regression model was used to identify associations.

RESULTS

There were 23,243 encounters that met the inclusion criteria for this study with patients having received prehospital care and documentation of at least one emergency department temperature. An optimal threshold of 36.2° C was found to predict mortality; 3,159 casualties had temperatures below this threshold (14%). Survival to discharge was lower among casualties with hypothermia (91% versus 98%). Hypothermic casualties were less likely to undergo blanket application (38% versus 40%). However, they had higher proportions with Hypothermia Prevention and Management Kit application (11% versus 7%) and radiant warming (2% versus 1%). On multivariable regression modeling, none of the hypothermia interventions were associated with a decreased likelihood of hypothermia. Non-hypothermia interventions associated with hypothermia included prehospital intubation (OR 1.57, 95% CI 1.45-1.69) and blood product administration.

CONCLUSIONS

Hypothermia, including a single recorded low temperature in the patient care record, was associated with worse outcomes in this combat trauma population. Prehospital intubation was most strongly associated with developing hypothermia. Prehospital warming interventions were not associated with a reduction in hypothermia risk. Our dataset suggests that current methods for prehospital warming are inadequate.

Helicopter Crashes in the Deployed Combat Setting: The Department of Defense Trauma Registry Experience

BACKGROUND

Military helicopter mishaps frequently lead to multiple casualty events with complex injury patterns. Data specific to this mechanism of injury in the deployed setting are limited. We describe injury patterns associated with helicopter crashes.

MATERIALS AND METHODS

This is a secondary analysis of a Department of Defense Trauma Registry (DODTR) dataset from 2007 to 2020 seeking to describe prehospital care within all theaters in the registry. We searched within the dataset for casualties injured by helicopter crash. A serious injury was defined by an abbreviated injury scale of =3 by body region.

RESULTS

We identified 120 casualties injured by helicopter crash within the dataset. Most were Army (64%), the median age was 30 (interquartile range [IQR] 26-35), and most were male (98%), enlisted service members made up the largest cohort (47%), with most injuries occurring during Operation Enduring Freedom (69%). Only 2 were classified as battle injuries. The median injury severity score was 9 (IQR 4-22). Serious injuries by body region are the following: thorax (27%), head/neck (17%), extremities (17%), abdomen (11%), facial (3%), and skin/superficial (1%). The most common prehospital interventions focused on hypothermia prevention/management (62%) and cervical spine stabilization (32%). Most patients survived to hospital discharge (98%).

CONCLUSIONS

Serious injuries to the thorax were most common. Survival was high, although better data capture systems are needed to study deaths that occur prehospital that do not reach military treatment facilities with surgical care to optimize planning and outcomes. The high proportion of nonbattle injuries highlights the risks associated with helicopters in general.

Navy En-Route Care in future Distributed Maritime Operations: A review of clinician capabilities and roles of care

OBJECTIVE

As the United States Navy transitions from Operation Iraqi Freedom/Operation Enduring Freedom to preparing for a near-peer competition, an increasing focus of wartime strategy relies upon a network of distributed naval assets for total sea control, known as Distributed Maritime Operations (DMO). Historically, embedded medical personnel have provided care at sea in times of war. Recent reviews of shipboard and evacuated mass casualty incidents have alluded to weaknesses in the existing Navy Medicine approach that will require advances in care provision to sustain high-quality care that would benefit from industry and civilian academic collaboration. To gain input from civilian prehospital expertise and insight, the current DMO and Navy En-Route Care (ERC) systems must be plainly described for non-Navy military and civilian leaders, clinicians, and researchers to understand (1).

METHODS

N/AResults: In this review, we translate US Navy structure and vernacular into common civilian and non-Navy language, describe the maritime role-tiered ERC system, elucidate the medical assets on each naval warship, and discuss clinician levels and capabilities while deployed to help communicate the inherent challenges of US Navy maritime medical care during routine operations, casualty treatment, stabilization, and evacuation.

CONCLUSIONS

We describe the roles of care, clinician levels, and medical assets within the Navy ERC system for researchers and military leaders who aim to mitigate the inherent challenges of future maritime trauma care in the age of Distributed Maritime Operations. This paper lays the framework for the Navy deployed medical system to enable research in maritime en-route care, and prompt inclusion of identified solutions into common use in the US Navy.

A Citywide Analysis of DWI Events in Association with Bar Reopening and Increased Restaurant Capacity

BACKGROUND

During the COVID-19 pandemic many bars closed. Simultaneously, many persons experienced stay at home orders linked to an increase in alcohol use. The net impact of these restrictions on the incidence of driving while intoxicated (DWI) events is unclear.

METHODS AND MATERIAL

We conducted a retrospective observational analysis using publicly reported data regarding police traffic encounters. We analyzed changes in DWI encounters in the San Antonio, TX metropolitan area before (1-14 October 2020) versus after (15-28 October 2020) bars reopened during the COVID-19 pandemic. We made these comparisons by comparing medians and through regression modelling to control for potential confounders.

RESULTS

During the study period, 16,609 police traffic encounters met inclusion criteria. Of these, 353 were DWI encounters, 594 were officer traffic stop encounters, 14,565 were traffic related encounters, 113 were wrong way driver encounters, and 984 were other traffic violations. In the before and after analysis, there was no difference in the daily median numbers of DWI encounters (12 versus 10, p=0.461), wrong way driver incidents (3 versus 2, p=0.328), or other traffic violations (34 versus 35, p=0.854). The multivariable regression model similarly identified no change in the daily incidence of DWI encounters (p=0.281).

CONCLUSIONS

We detected no change in the incidence of DWI encounters immediately following the reopening of bars in the San Antonio metropolitan area.

Implementation of the Acute Care Clinic Easy Scheduling System at the Brooke Army Medical Center

Introduction

Emergency departments (EDs) have continued to struggle with overcrowding, causing delays in patient care and increasing stress on the medical staff and resources. This was further illustrated during the recent coronavirus disease 2019 pandemic, where we saw large unpredictable surges to the ED as hospitals tried to meet the medical needs of patients while trying to minimize the spread of coronavirus disease. A previous study from the Department of Emergency at the Brooke Army Medical Center (BAMC) found that nearly half of the patients presenting to the ED could have been managed in a primary care setting. We sought to pilot an alternate appointment scheduling system, Acute Care Clinic Easy Scheduling System, to allow patients to see and book available appointments while waiting in the ED waiting room.

Materials and Methods

Our appointment display system was created through collaboration with the BAMC Information Management Division. A Tableau data interface connects to the Composite Health Care System to view available primary appointments across the San Antonio Military Health Care System. These are displayed in real-time on multiple TV screens outside the ED and in the ED waiting room. Patients were provided signage that provides a way to call or use a World Wide Web–based interface to immediately schedule the open appointments within the next 48 hours. Patients voluntarily opted to use this system and may opt to leave the ED if another appointment became available within an acceptable time frame to them.

Results

This section is not applicable to this article.

Conclusions

Expansion of the Acute Care Clinic Easy Scheduling System within the Military Health Care System may (1) help reduce ED crowding, (2) improve access to care through a live-tracking system that patients can review and select from, and (3) reduce the number of unfilled primary care appointments. The system in place in the BAMC ED serves as a template for other MTFs to use.

The regional whole blood program in San Antonio, TX: A 3-year update on prehospital and in-hospital transfusion practices for traumatic and non-traumatic hemorrhage

Low titer type O Rh-D + whole blood (LTO + WB) has become a first-line resuscitation medium for hemorrhagic shock in many centers around the World. Showing early effectiveness on the battlefield, LTO + WB is used in both the pre-hospital and in-hospital settings for traumatic and non-traumatic hemorrhage resuscitation. Starting in 2018, the San Antonio Whole Blood Collaborative has worked to provide LTO + WB across Southwest Texas, initially in the form of remote damage control resuscitation followed by in-hospital trauma resuscitation. This program has since expanded to include pediatric trauma resuscitation, obstetric hemorrhage, females of childbearing potential, and non-traumatic hemorrhage. The objective of this manuscript is to provide a three-year update on the successes and expansion of this system and outline resuscitation challenges in special populations.

An analysis of early volume resuscitation and the association with prolonged mechanical ventilation

BACKGROUND

Previous studies have found that intravenous fluid administration within the first 24 h may be associated with prolonged mechanical ventilation (PMV). We examined the association between initial 24 h fluids and PMV in combat casualties.

METHODS

This is a secondary analysis of a previously described dataset from the Department of Defense Trauma Registry (DODTR). We included casualties with at least 24 h on the ventilator and no significant traumatic brain injury. The definition of PMV and associations were constructed using univariable and multivariable logistic regression models.

RESULTS

We identified 1508 casualties available for analysis for this study - 1275 in the non-PMV cohort (<9 days on ventilator vs. 233 in the PMV cohort (≥9 days on ventilator). Explosives comprised the most common mechanism of injury for both groups (72% vs. 75%) followed by firearms (21% vs. 16%). The composite injury severity score (ISS) was lower in the non-PMV cohort (18 vs. 30, p < .001). There were lower volumes of all resuscitation fluid within the first 24 h in the non-PMV cohort. When adjusting for composite ISS and mechanism of injury in a multivariable logistic regression model with PMV as the outcome, crystalloid volume (unit odds ratio [UOR] 1.07) and colloid volume (UOR 1.03) were both associated with PMV.

CONCLUSIONS

We found that volume of resuscitation fluids were substantially higher in the PMV cohort. Our findings suggest the need for caution with the routine use of crystalloid and colloid in the first 24 h of resuscitation.

Analgesia and Sedation for Tactical Combat Casualty Care: TCCC Proposed Change 21-02

Analgesia in the military prehospital setting is one of the most essential elements of caring for casualties wounded in combat. The goals of casualty care is to expedite the delivery of life-saving interventions, preserve tactical conditions, and prevent morbidity and mortality. The Tactical Combat Casualty Care (TCCC) Triple Option Analgesia guideline provided a simplified approach to analgesia in the prehospital combat setting using the options of combat medication pack, oral transmucosal fentanyl, or ketamine. This review will address the following issues related to analgesia on the battlefield: 1. The development of additional pain management strategies. 2. Recommended changes to dosing strategies of medications such as ketamine. 3. Recognition of the tiers within TCCC and guidelines for higher-level providers to use a wider range of analgesia and sedation techniques. 4. An option for sedation in casualties that require procedures. This review also acknowledges the next step of care: Prolonged Casualty Care (PCC). Specific questions addressed in this update include: 1) What additional analgesic options are appropriate for combat casualties? 2) What is the optimal dose of ketamine? 3) What sedation regimen is appropriate for combat casualties?

Development of Data-Driven Triage Systems for Identifying Mortally Wounded Casualties-Implications for Future Large-Scale Combat Operations

BACKGROUND

Uncontested air movement and advances for medical care of combat casualties have resulted in a decreased case fatality rate. However, in future large-scale combat operations, the military has established a plan for multidomain operations to defeat near-peer adversaries. Prolonged casualty care and mass casualty scenarios will become more prevalent. Prehospital friendly scoring systems such as the shock index (SI) and revised trauma score (RTS) may provide useful triage data. Development of accurate, data-driven, triage systems will be key to optimize management of resources, care, and transport of combat casualties.

METHODS

We included data from the Department of Defense Trauma Registry between 01 January 2007 to 17 March 2020. Data comprised of adult US military or coalition service members for analysis as the baseline cohort, and those who died within 24 hours were included in the early death cohort. We performed statistical analysis on demographics and injury data, SI and RTS to measure the receiver operating characteristics (ROC) of each value to predict early death.

RESULTS

The early death cohort had a significantly higher injury severity score (25 vs. 5) and a higher percentage of serious injuries in every body region than the baseline cohort. The early death cohort sustained serious injuries to the head and neck at a rate five times that of the baseline cohort (43.4% vs 8.1%) with odds ratio (OR) of death 8.0 (95% confidence interval 5.7-11.1) followed by skin (13.6% versus 1.9%) with an OR of 6.3 (95% CI 3.8-10.3). The mean SI was 1.21 versus 0.80. The revised trauma score (RTS) was 4.18 versus 7.34. The RTS had a higher area under the receiver operating characteristic (0.896 versus 0.716 for SI).

CONCLUSIONS

Serious injuries to the head and skin were most strongly associated with death within the first 24 hours. The RTS appears to be a more accurate tool than SI alone for assessing injury mortality. Military medical personnel should consider these factors when triaging casualties during future conflicts in resource limited settings with delayed evacuation.

Descriptive Analysis of Casualties Rapidly Returned to the Fight after Injury: Reverse Triage Implications for Large Scale Combat Operations

BACKGROUND

During large scale combat operations, rising numbers of casualties will likely outstrip in-theater US military medical hospitalization assets. This highlights the importance of identifying those casualties who can return to the fight in order to minimize further medical resource depletion. We describe specific characteristics of casualties returned to duty without requiring evacuation from theater during recent major combat operations.

MATERIALS AND METHODS

We conducted a secondary analysis of previously published data from the Department of Defense Trauma Registry during 01 January 2007 through 17 March 2020. We included all adult US military casualties. We categorized casualties according to documented disposition, namely, return to duty within 72 hours without evacuation from theater, return to duty greater than 72 hours without evacuation from theater, and all other casualties.

RESULTS

Of 10,182 adult US military casualties, 3,856 (37.9%) returned to duty within 72 hours without evacuation from theater and 220 (2.2%) returned to duty in greater than 72 hours without evacuation from theater. The cohort that rapidly returned to duty had a lower median injury severity score (2) than casualties returning to duty in greater than 72 hours (4) and those evacuated from theater (11). Notably higher proportions of casualties evacuated from theater sustained injuries to the face, thorax, abdomen, and extremities. Modes of transportation were similar across all three groups, though casualties undergoing evacuation from theater were more likely to undergo air transportation during the spectrum of their medical care.

CONCLUSIONS

Most combat casualties returning to duty without evacuation from theater did so within 72 hours of hospitalization. Casualties not requiring evacuation from theater were less likely to sustain injuries to the face, thorax, abdomen, and extremities.

Battle Injury Patterns Sustained Noncombatant Military Occupational Specialty Service Members

BACKGROUND

The US military has been engaged in the Global War on Terrorism for nearly 2 decades. This asymmetric warfare has exposed many noncombat military occupational specialties (MOS) personnel to combat. We assessed what proportion of casualties were combat versus noncombat MOS personnel.

METHODS

This is a secondary analysis of a previously described dataset from the Department of Defense Trauma Registry (DODTR). We included US military casualties sustaining battle injuries from January 2007 to March 2020 with a documented MOS. We classified each casualty as combat versus noncombat MOS personnel.

RESULTS

There were 2,037 casualties who met inclusion for this analysis. Within these groups, there were 1,554 (76%) combat and 483 (24%) noncombat personnel. The median ages were 24 and 25, with more males among the combat MOS personnel (99% versus 93%). Army personnel comprised the largest proportion of both groups (78% versus 75%) with most injured by explosive (73% versus 78%). Median injury severity scores were similar (9 in both groups) as was survival (98% versus 98%). The annual proportion of battle injuries comprised of noncombat MOS personnel fluctuated year-to-year. The proportion of noncombat personnel with a medic in their chain of care was similar to combat personnel (25% versus 26%), as was the proportion undergoing medical evacuation by ground (11% versus 11%) or air (87% versus 86%). All prehospital interventions occurred in similar proportions except for ketamine administration (8% combat versus 3% noncombat MOS personnel).

CONCLUSIONS

Our study showed noncombat MOS personnel comprised nearly one in four casualties. Injury patterns were similar between combat and noncombat MOS personnel with nearly identical consumption of resources except for ketamine. More data is necessary on noncombatant MOS personnel battle injury patterns to guide commanders and medical leaders for future mission planning in resource constrained environments.

Incidence of Expired Blood Product Use in the US Central Command Theater of Operations

OBJECTIVE

Introduction: During multi-domain combat operations, logistical constraints may compel forward medical personnel to decide whether to use expired blood products. The incidence of expired blood product usage in recent conflicts is unknown.

METHODS

We queried the Armed Services Blood Program (ASBP) database of all blood administered in theater from 2002-2019. We categorized any administration of blood product with a transfusion date of 1-30 days after the expiration date for this analysis. We excluded any documented transfusions more than 30 days after the expiration date as likely represents clerical error based on study team experience.

RESULTS

There were 1,491 (0.4% of the total transfusion dataset) units that met inclusion for this analysis. Of the 1,491, 86% (n=1,278 transfusions) will occur within 1-3 days post-expiration. These 1,491 units were transfused into 741 patients. The majority of expired blood product recipients were male (87%). Afghans were most frequent (46%), followed by US forces (22%) with most occurring during Operation Enduring Freedom (64%). Trauma was the most common mechanism of injury for these patients (70%). The most common blood type transfused to recipients was O positive (28%). The most frequently transfused expired unit was red blood cells (n=899), followed by platelets (n=299), followed by whole blood (n=152).

CONCLUSIONS

Expired red blood cell and platelet use suggests a need for better methods for extending the lifespan of whole blood and further development of longer stability cold-stored platelets to meet the needs of our end-users. Our data arises from mature theaters during counterinsurgency operations. The incidence of transfusion of expired blood products may increase in future multi-domain operations where medical personnel are likely to operate under more resource constrained settings.

Simulation-Based Assessment of the Novel, Disposable i-view Video Laryngoscope by Emergency Medicine Physicians

INTRODUCTION

Airway obstruction is the second leading cause of potentially preventable death on the battlefield. Previous studies demonstrate the most frequent airway intervention is intubation. Currently, the US Army has advanced video laryngoscopy (VL) in its sets, kits, and outfits (SKOs) at a cost of approximately $12,000 and generally only deploys them to the forward resuscitative surgical detachments and field hospitals. The i-view is a disposable video laryngoscope that costs approximately $120. The purpose of this study was to assess operator performance with this device and survey user opinions.

METHODS

We conducted a prospective, observational study with emergency medicine residents and attending physicians using a synthetic cadaver model. Placement success, time-to-cannulation, number of attempts, and number and type of complications were recorded, followed by surveys.

RESULTS

We enrolled 31 participants. One was missing data and was excluded, leaving 30 for analysis. The median age was 29, most (66%) were male, most were Air Force (57%), in-training residents (77%) with few reporting previous deployment experience (13%). Almost all had real patient experience with both direct (93%) and video laryngoscopy (90%). Most (90%) were able to get a grade 1 view with all achieving airway cannulation on first-pass attempt. The median time to cannulation was 11.6 seconds. On the post-procedure survey, most strongly agreed they would use this in the deployed setting (77%). Most reported they found it easy to use (77%).

CONCLUSION

Our simulation-based study demonstrates the device has strong potential use for the clinical setting with all achieving rapid first-pass success for intubation. This study lays the foundation for validation of this device in the clinical setting.

An Assessment of Nursing Skills Required for Sustaining a Casualty during Prolonged Casualty Care: Implications for Training and Preparing for the Next Major War

BACKGROUND

The US military is transitioning rapidly from the Global War on Terrorism in preparation for near-peer combat in a multidomain operations (MDO) and/or large scale combat operations (LSCO) setting. Due to potentially contested freedom of movement in this setting, casualty evacuation may be significantly delayed, resulting in medics and other prehospital medical personnel taking on patient care duties normally performed by nurses in a hospital-based setting. However, the frequency of nursing-type care remains unclear. We seek to determine the nursing interventions typically performed in a facility with patient holding capability during the first 72 hours of care in the deployed setting.

MATERIALS AND METHODS

This is a sub-analysis of previously described data from the Department of Defense Trauma Registry of US and North Atlantic Treaty Organization (NATO) military personnel from January 2007 to March 2020 with a focus on relevant nursing procedures identified in current Individual Critical Task Lists (ICTL) for critical care, emergency, medical-surgical nurses, and combat medics.

RESULTS

Among all casualties, the most common nursing-related skills performed in the prehospital setting were wound dressing application (33%), administration of parenteral opioids (35%), and administration of ketamine (7%); in the hospital setting were preparation for transfer (60%), managing a post-operative patient (59%), and managing a traumatic brain injury (44%). In the hospital setting, most patients had a blood gas performed (73%), ventilator management occurred for 21% of patients, and administration of packed red blood cells occurred for 21% of patients.

CONCLUSIONS

Nursing-type interventions were frequently required during the first 72 hours of casualty care. The frequency of the required interventions demonstrates the need for ongoing nursing skills training for medics supporting casualties in the setting of prolonged casualty care.

An Analysis of the Incidence of Hypocalcemia in Wartime Trauma Casualties

OBJECTIVE

Background: Massive transfusion protocols implement the use of blood products to restore homeostasis. Citrated blood products are required for massive transfusions and can induce hypocalcemia, resulting in decreased cardiac contractility. Recent data suggests that major trauma alone is associated with hypocalcemia. This phenomenon remains poorly described. We seek to characterize the incidence and risk factors for early hypocalcemia in the setting of combat trauma.

MATERIALS AND METHODS

This is a secondary analysis of previously described data from the Department of Defense Trauma Registry from January 2007 to March 2020. In this sub-analysis, we selected only casualties that had at least one ionized calcium measurement. We defined hypocalcemia as an ionized calcium level of less than 1.2mmol/L.

RESULTS

Within our study database, there were 142 adult casualties that met inclusion with at least one calcium value documented. We found 72 (51%) experienced at least one episode of hypocalcemia. Median composite injury severity score (ISS) was significantly lower in the control cohort compared to those with hypocalcemia (9 versus 15, p=0.010). Survival was similar between the two groups (97% versus 90%, p=0.166). On multivariable analysis when evaluating serious injuries by body region, only serious injuries to the extremities were significantly associated with developing hypocalcemia (odds ratio [OR] 1.48, 95% confidence interval [CI] 1.00-2.21). When comparing prehospital interventions, only intravenous (IV) fluid administration was associated with high proportions experiencing hypocalcemia (25% versus 43%, p=0.029). In the multivariable model adjusted for ISS, mechanism of injury, and patient category, IV fluids were associated with the development of hypocalcemia (OR 2.48, 95% CI 1.03-5.94). When comparing vital signs, only respiratory rates were noted to be higher in the hypocalcemia cohort (18.6 versus 20.4, p=0.048).

CONCLUSIONS

Approximately half of combat casualties with available ionized calcium (iCa) level were hypocalcemic. Prehospital IV fluid use was associated with the development of hypocalcemia. Our study has implications for forward-staged medical teams with limited laboratory analysis capabilities. Additional research is needed to determine whether calcium replacement improves survival from traumatic injury and to identify the specific indications and timing for calcium replacement. This study will help inform a clinical study intended to aid in the development of clinical practice guidelines for deployed medical personnel.

A Scoping Review of Promising Alternative Blood Products for Prolonged Field Care

Hemorrhage is the leading cause of potentially preventable death on the battlefield. Blood transfusions are used as treatment to restore circulating volume until the hemorrhage can be surgically controlled. Research has shown earlier transfusion of blood products has better casualty outcomes, so blood products have been pushed forward to the point of injury. Currently, there is a mixed use of blood components and whole blood in the prehospital setting-both of which have challenging supply chain requirements. Alternative blood products offer several potential advantages, as they are easier to mass produce, obviating the need for donor recruitment. They also have improved shelf-life stability, potentially remove cold-chain storage, and even cross-matching requirements. In this limited review, we sought to provide a narrative review of current promising developments including hemoglobin-based oxygen carriers, polyhemoglobin, platelet like cells, dried plasma, liquid plasma, fibrinogen concentrates, enzyme concentrates, nanoparticles, and perfluorocarbon-based artificial oxygen carriers.

An Analysis of Patient Movements during Sustained Combat Operations in the US Central Command: Implications for Remote Support Capabilities

BACKGROUND

The US Central Command (CENTCOM) area of responsibility (AOR) spans 20 nations in the Middle East, Central, and South Asia. Evacuations outside this AOR include all injury types and severities; however, it remains unclear what proportion of evacuations were due to disease and non-battle injuries (DNBI). Understanding these patterns may be useful for defining future medical support requirements for multi domain operations (MDO). We sought to analyze encounters obtained from the Transportation Command Regulating and Command and Control Evacuation System (TRAC2ES) data for medical evacuations within CENTCOM.

METHODS

We obtained all encounters within TRAC2ES from February 2009 to November 2018. We analyzed data using entered demographic data and keyword categorization of free text information provided by the medical officer requesting patient movement.

RESULTS

There were 50,036 patient movement requests entered into TRAC2ES originating from the CENTCOM AOR for both military and civilian personnel. After removal of ineligible entries (for example, military working dogs), the number of eligible subjects was 49,259, 13 percent combat (n equals 6,389) and 87 percent were noncombat (n equals 42,870). The primary age group requiring evacuation was 18 through 29 (59 percent) and were mostly male (87 percent). Most went by routine status (80 percent), followed by priority (16 percent). Most of the transfers originated from Afghanistan (58 percent) and Iraq (22 percent), with Germany serving as the primary destination (79 percent). Results showed the total number of patient evacuations increased from 2009 to 2010 and then decreased from 2011 to 2017. The most frequent body region associated with the transfer was the extremities for both combat (54 percent) and noncombat (32 percent).

CONCLUSIONS

Out of theater disease and non combat injury evacuation rates were nearly 7 times higher than for combat related injuries. Our results highlight the need for additional research and development resources of DNBI related medical care. As we move into future MDO with limited evacuation capabilities, we will need support solutions to cover the full gamut of DNBI.

An Innovative Civilian Research Model to Inform Combat-Relevant Prolonged Casualty Care

Prolonged Casualty Care (PCC) is a major US military research focus area. PCC is defined as the need to provide patient care for extended periods when evacuation or mission requirements surpass capabilities and/or capacity. US military experts have called for more data relevant to PCC. In response, we aimed to develop an innovative research model using a tiered system of trauma care in the Western Cape of South Africa as a framework for studying relevant US military trauma care and outcomes in a natural prolonged care environment. The objective of this report is to describe the research model and to illustrate how various components of the model may be helpful to provide data relevant to US military PCC. To develop the model, we used a combination of published data, open access reports, and expert opinion to identify, define, and compare relevant components of the Western Cape trauma system suitable for researching aspects of US military PCC. Several key features of the research model are as follows: In the Western Cape, patients are referred from primary and secondary to tertiary facilities (analogous to escalating capabilities by advancing roles of care in the US military). Western Cape civilian trauma providers' capabilities range from prehospital basic life support to definitive trauma surgical and critical care (comparable to US military Tactical Combat Casualty Care to advanced definitive surgical care). Patterns of injuries (e.g., high rates of penetrating trauma and hemorrhagic shock) and prolonged times from injury to definitive surgical care in the Western Cape system have relevance to the US military. This civilian research model for studying PCC is promising and can inform US military research. Importantly, this model also fills gaps in the South African civilian system and is useful for other prolonged trauma care communities worldwide.

Clinical impact of a prehospital trauma shock bundle of care in South Africa

Introduction

Patients experiencing traumatic shock are at a higher risk for death and complications. We previously designed a bundle of emergency medical services traumatic shock care (“EMS-TruShoC”) for prehospital providers in resource-limited settings. We assess how EMS-TruShoC changes clinical outcomes of critically injured prehospital patients.

Methods

This is a quasi-experimental educational implementation of a simplified bundle of care using a pre-post design with a control group. The intervention was delivered to EMS providers in Western Cape, South Africa. Delta shock index (heart rate divided by systolic blood pressure, reported as change from the scene to facility arrival) from the 13 months preceding intervention were compared to the 13 months post-implementation. A difference-in-differences analysis examined the difference in mean shock index change between the groups.

Results

Data were collected from 198 providers who treated 770 severe trauma patients. The patient groups had similar demographic and clinical characteristics at baseline. Over all time-points, both groups had an increase in mean delta shock index (worsening shock), with the largest difference occurring 4-months post-implementation (0.047 change in control arm, 0.004 change in intervention arm; −0.043 difference-in-differences, P = 0.27). In pre-specified subgroup analyses, there was a statistically significant improvement in delta shock index in the intervention arm in patients with penetrating trauma cared for by basic providers immediately post-implementation (−0.372 difference-in-differences, P = 0.02).

Discussion

Overall, there was no significant difference in delta shock index between the EMS-TruShoC intervention versus control groups. However, significant improvement in shock index in one subgroup suggests the intervention may be more likely to benefit penetrating trauma patients and basic providers.

Review of Commercially Available Supraglottic Airway Devices for Prehospital Combat Casualty Care

Background

Airway obstruction is the second leading cause of potentially survivable death on the battlefield. The Committee on Tactical Combat Casualty Care lists airway optimization among the top 5 battlefield research and development priorities; however, studies show that combat medics lack access to the recommended supraglottic airway (SGA) devices. SGA devices are an alternative airway management technique to endotracheal tube intubation. Reports have shown SGA devices are easier to use and take fewer attempts to provide patent airflow to the patient when compared to endotracheal tube intubation. Military settings require a higher degree of skill to perform airway management on patients due to the environment, limited availability of equipment, and potential chaos of the battlefield. Finding the optimal SGA device for the military setting is an unmet need. The International Organization for Standardization describes basic functional requirements for SGA devices, as well as patient configurations and size limitations. Beyond that, no SGA device manufacturer states that their devices are intended for military settings.

Materials and Methods

We conducted a market review of 25 SGA devices that may meet inclusion into the medics’ aid bag. The company’s official “Instructions for Use” document, Google Scholar, and FDA reports were reviewed to obtain information for each SGA device.

Results

Twenty-five commercially available SGA devices are explored from manufacturer online sources. A commercially available device list is shown later in this paper, which provides the device’s features, indications, and contraindications based on the manufacturer’s product information documentation.

Conclusions

There are a variety of devices that require further testing to determine whether they should be included in sets, kits, and outfits.

A Retrospective Review of Emergency Department Visits That May Be Appropriate for Management in Non-Emergency Settings

Background

Emergency departments (EDs) continue to struggle with overcrowding, increasing wait times, and a surge in patients with non-urgent conditions. Patients frequently choose the ED for non-emergent medical issues or injuries that could readily be handled in a primary care setting. We analyzed encounters in the ED at the Brooke Army Medical Center—the largest hospital in the Department of Defense—to determine the percentage of visits that could potentially be managed in a lower cost, appointment-based setting.

Materials and Methods

We conducted a retrospective chart review of patients within our electronic medical record system from September 2019 to August 2020, which represented equidistance from the start of the COVID-19 pandemic, resulting in a shift in ED used based on previously published data. Our study also compared the number of ED visits pre-covid vs. post-covid. We defined visits to be primary care eligible if they were discharged home and received no computed tomography imaging, ultrasound, magnetic resonance imaging, intravenous medications, or intramuscular-controlled substances.

Results

During the 12 month period, we queried data on 75,205 patient charts. We categorized 56.7% (n = 42,647) of visits as primary care eligible within our chart review. Most primary-care-eligible visits were ESI level 4 (59.2%). The largest proportion of primary-care-eligible patients (28.3%) was seen in our fast-track area followed by our pediatric pod (21.9%). The total number of ED visits decreased from 7,477 pre-covid to 5,057 post-covid visits. However, the proportion of patient visits that qualified as primary care eligible was generally consistent.

Conclusions

Over half of all ED visits in our dataset could be primary care eligible. Our findings suggest that our patient population may benefit from other on-demand and appointment-based healthcare delivery to decompress the ED.