ABSTRACT

Background: Among individuals with prior exertional heat illness (EHI), heat tolerance testing (HTT) may inform risk and return to duty/activity. However, little is known about HTT's predictive validity, particularly for EHI recurrence. Our project sought to demonstrate the predictive validity of HTT in EHI recurrence and HTT's utility as a diagnostic tool in exertional heat stroke (EHS). Methods: Participants with prior EHS were recruited for the study by a physician's referral and were classified as heat tolerant or intolerant after completing demographics and an HTT. Participants were further categorized as single/simple (SS) EHI or recurrent/complex (RC) EHI by conducting a retrospective record review of the following two years. We calculated the positive (PPV) and negative predictive values (NPV) of HTT. Results: The retrospective review of HTT records was used to categorize 44% of Servicemembers as RC, with 77% classified as heat tolerant, 14% as heat intolerant, and 9% as borderline. When borderline cases were classified as heat intolerant, HTT had a high NPV, indicating a high probability that heat-tolerant individuals did not have recurrent EHI. When borderline cases were classified as heat tolerant, NPV and sensitivity decreased while specificity increased. Conclusion: We demonstrated that the HTT had a 100% NPV for future EHI over two years of follow-up for Servicemembers with a history of recurrent heat injury and negative HTT results. An HTT can provide critical data points to inform return to duty decisions and timelines by predicting the risk of EHI recurrence.

When Minutes Matter: A Comparison of Whole Blood Collection Techniques

Wier R, Walther S, Woodard C, Jordan CS, Matthews KJ, Deaton TG, Drew B, Byrne T, Zarow GJ. 24(1). 53 - 59. (Journal Article)

ABSTRACT

Background: Fast and reliable blood collection is critical to emergency walking blood banks (WBB) because mortality significantly declines when blood is quickly administered to a warfighter with hemorrhagic shock. Phlebotomy for WBB is accomplished via either the "straight stick" (SS) or "ruggedized lock" (RL) method. SS comprises a 16-gauge phlebotomy needle connected to a blood collection bag via tubing. The RL device collects blood through the same apparatus, but has a capped, intravenous (IV) catheter between the needle and the donor's arm. This is the first study to compare these two methods in battlefield-relevant metrics. Methods: Military first responders and licensed medical providers (N=86) were trained in SS and RL as part of fresh whole blood training exercises. Outcomes included venipuncture success rates, time to IV access, blood collection times, total time, and user preferences, using a within-subjects crossover design. Data were analyzed using ANOVA and nonparametric statistics at p<0.05. Results: SS outperformed RL in first venipuncture success rates (76% vs. 64%, p=0.07), IV access times (448 [standard error of the mean; SE 23] vs. 558 [SE 31] s, p<0.01), and blood collection bag fill times (573 [SE 48] vs. 703 [SE 44] s, p<0.05), resulting in an approximate 3.5-minute faster time overall. Survey data were mixed, with users perceiving SS as simpler and faster, but RL as more reliable and secure. Conclusion: SS is optimal when timely collection is imperative, while RL may be preferable when device stability or replacing the collection bag is a consideration.

ABSTRACT

Military working canines are critical assets and force multipliers for the Joint Force. Most often deployed forward of Role 2 assets, they are reliant on non-veterinary resources when wounded, ill, or injured in an operational environment. Hemorrhagic shock is the most prevalent form of shock seen in battlefield injuries and is most effectively treated with whole blood transfusion. Dogs cannot be transfused with human blood and there is no formal Department of Defense (DoD) canine blood product distribution system to operational settings. A walking blood bank is helpful when multiple dogs are geographically co-located and the resource can be provided to an injured patient quickly. In areas as widely dispersed as the Horn of Africa, the likelihood of co-location is slim and delaying this vital resource can mean the difference between life and death. Therefore, personnel at the Role 2 facility in Camp Lemonnier, Djibouti, filled a critical capability gap for the operational area by producing a local canine whole blood bank with distribution to multiple countries. This protocol can be replicated by other locations to improve medical readiness for the working canines who serve to maintain DoD Force Protection.

Keywords: military working dogs; whole blood transfusion; transfusion medicine; veterinary medicine



The JSOM podcast digs deeper into the articles and subjects that matter to our readers. Our podcast hosts, Captains Alex Merkle and Josh Randles, tackle articles from the journal based on merit, interest, and application for operators in the field. The Winter 23 episode is here!

Current Episode

Our JSOM podcast team will be reviewing the following articles for our Winter podcast: 

Optimizing Brain Health of United States Special Operations Forces by Brian L. Edlow, Natalie Gilmore, Samatha L. Tromly, et al. 

Bluetooth Tactical Headsets Improve the Speed of Accurate Patient Handoffs by Daniel J. Stinner, Cory McEvoy, Michael A. Broussard, et al.

Effectiveness of Sternal Intraosseous Device in Patients Presenting with Circulatory Shock: A Retrospective Observational Study by Allyson M. Hynes, Shyam Murali, Gary A. Bass, et al. 

JSOM Guest Medic Interview

Our guest medic for this quarter is Ricky Ditzel, who will review “Optimizing Brain Health of United States Special Operations Forces” by Edlow and colleagues. Ricky and his two siblings’ adolescent lives were defined by chaos. Inspired to make a positive change for his family, he enlisted in the Army and served as a U.S. Army Special Operations Flight Paramedic. In this role, Ricky treated U.S. and Allied forces Servicemembers who suffered from the acute and chronic effects of traumatic brain injury. These experiences propelled Ricky to become a neurodegenerative disease researcher and vocal advocate for brain and mental health. Ricky believes strongly in a life of service and consistently seeks opportunities to support underserved communities and promote health equity. He believes the current healthcare structure reduces access to care for individuals with neurologic disabilities because of limitations associated with public transportation, specialty care access, and education. Driven towards research and finding solutions to increase the quality of life for people with neurological disabilities, Ricky is pursuing a career as a physician. He plans to create a neurologic center of excellence that will provide comprehensive multidisciplinary outpatient care under one roof. Ricky is the Chairman of the Special Operations Forces to School of Medicine (SOF to SOM) (https://www.softosom.org/), a board member of Neuroacanthocytosis Advocacy USA, and the Special Operations Medical Association. He will continue to serve his country and community while doing his best to honor the legacies of those who have gone before him. “For they loved to fight, fought to win, and would rather die than quit. Night Stalkers don’t quit!”

JSOM Guest Author Interview

Our guest author interview will be with Cory McEvoy, author of “Bluetooth Tactical Headsets Improve the Speed of Accurate Patient Handoffs.” Cory is a former 18D who served with 1-1SFG(A) and USASOC. Cory has deployed to both humanitarian and combat zones as an 18D and has been involved with many research projects, with his primary interest being repetitive and low-level blast. Cory left the Army in 2023 and is in the process of applying to medical school.

The Journal of Special Operations Medicine is proud to have the support of many great sponsors and media partners. Our sponsors are leaders in the field of military medical technology. Please help support these companies by following the links below to learn more about their missions and the products they offer. This section also features peridoic promtional information for events and conferences, including the 2024 SOMA Scientific Assembly. 

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Visit https://jsom.us/Library for a full list of institutions currently subscribing to the JSOM. We are beginning a campaign to expand our institutional subscriptions. If you think your company would benefit from an institutional subscription, let us know! We'll be happy to talk to you and get the ball rolling. You don't have to be a university or medical center to subscribe - we have many EMS units, government agencies, and military medical units in the United States and abroad.

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For over 20 years, the Journal of Special Operations Medicine (JSOM) has brought important, lifesaving information to the Special Operations Forces (SOF) community. And over the years, as our audience and readership has expanded into over 80 countries, physicians, military and tactical medics, and other medical professionals working in unconventional environments rely on the JSOM for breakthrough research at the intersection of operational medicine and tactical casualty care. Our peer-reviewed research and interactive clinical content make the JSOM a must-read for:

• Physicians
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• The military and civilian global medical community

For these reasons, many of the world’s top medical technology companies and medical device distributors make the JSOM a cornerstone of their advertising programs. And with a strong multichannel and social media presence, the JSOM offers the most dynamic print and digital media options at cost-effective prices. For medical marketers worldwide looking to reach our niche audience, the JSOM is the gold standard. For more information, please see our attached media kit.

Coming Soon from the Journal of Special Operations Medicine published by Breakaway Media, LLC

We are excited to announce the upcoming publication of Tell Them Yourself: It's Not Your Day To Die*, by Frank Butler, Kevin O'Connor, and Jeff Butler.

It's an extraordinary, true account of how a small group of world-class trauma experts joined forces with America’s best combat medics to rewrite the battlefield medicine rule book and then sell these revolutionary new concepts to a disbelieving medical world.

This is the definitive record of how TCCC came to be and how these protocols forever changed the way care is provided to those wounded in combat, written by the men who fought for the change.

*This highly anticipated book will premiere at the 2024 Special Operations Medical Association symposium. Dr. Frank Butler will be at the JSOM booth signing copies. The book will then be available to purchase on the JSOM website on or around May 20th.



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