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              Therefore, causal inferences cannot be made regarding JTQ   deterministic linkage rules.   These limitations underscore
              efficacy and survival.                             the need for better prospective data collection methods.
              It is surprising to find so few cases of recorded JTQ use in the   Conclusion
              combat setting, especially given that JTQ models were  first
                                31
              FDA approved in 2010  and announced as standard issue for   JTQ application in the combat setting is rare. When it is per-
                                     32
              Army combat medics in 2016.  Furthermore, previous studies   formed, it is frequently in the setting of polytrauma. Survival
              have suggested that junctional hemorrhage has accounted for   was high, but DoDTR enrollment survival biases were likely
                                                      6
              up to 19% of potentially survivable combat injuries,  and vari-  confounded by this.
              ous laboratory-based studies have suggested that JTQs may be
              highly effective in treating these injuries. 10,14,17,33  Given the high   Acknowledgments
              rates of death from torso and junctional hemorrhage, it re-  The authors acknowledge the Department of Defense Trauma
              mains unclear why their use is so infrequent. Some possibilities   Registry for providing the data for this study.
              include JTQ cost, inadequate training or familiarization with
              JTQ use and application, prolonged time to application, feared   Author Contributions
              dislodgement during transport, and lack of wide distribution   HBR drafted the initial manuscript and performed revisions.
              throughout the battlespace. Future studies may consider a   BJL, JAR,  ADF, and MDA provided critical subject matter
              qualitative analysis of medics’ perspectives and concerns re-  expertise. SGS, the overall principal investigator, conceptualized
              garding JTQ use in combat to understand this discrepancy bet-  the study, performed the data analysis, and made critical
              ter. In short, while JTQ use may benefit the small percentage of   revisions. All authors contributed substantially.
              severely injured patients currently receiving them, their stan-
              dard incorporation into medic field bags should be carefully   Disclaimer
              evaluated, considering both the monetary and practical costs   The views expressed in this article are those of the authors and
              of fielding them in such numbers.                  do not reflect the official policy or position of the U.S. Army
                                                                 Medical Department, Department of the Army, Department of
              If JTQ use is prioritized in the limited military equipment allo-  Defense, or the U.S. Government.
              cation and training time, further consideration should be given
              to its implementation strategy. While limited data are available   Disclosures
              regarding the specific type of JTQ used, the high percentage of   The authors have nothing to disclose.
              abdominal injuries (second only to lower extremity injuries)
              may suggest a larger future role for the AAJT model and its   Funding
              ability to perform external aortic compression. Prior studies   No funding was received for this work.
              have noted that such external aortic compression and its low
              failure rates during transport may be the equivalent of the
              “high and tight” maxim, emphasizing the importance of rapid,   References
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