25/06/2026
‼️When did the Trauma Triad of Death become the Trauma Diamond of Death⁉️
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The lethal triad (or trauma triad of death) refers to the interaction of hypothermia, acidosis, and coagulopathy. These conditions are indicators of injury severity and as mutually reinforcing problems that influence trauma patient morbidity and mortality. Hypothermia impairs physiologic and coagulation processes, acidosis commonly reflects inadequate perfusion and tissue hypoxia, and coagulopathy limits the patient’s ability to control bleeding. Together, these conditions create a cycle in which shock, bleeding, impaired clotting, and worsening metabolic status accelerate clinical decline.
The triad became the “diamond of death” when hypocalcemia was added as a fourth interdependent component. Trauma care has traditionally centered on hemorrhage control while mitigating hypothermia, acidosis, and coagulopathy, but newer data support hypocalcemia as closely linked to each element of the triad. Calcium matters because it helps a bleeding patient form clots, maintain blood vessel tone, and keep the heart pumping effectively. When ionized calcium drops, clots may form poorly, blood pressure will become more difficult to control, all of which leads to exacerbation of shock.
C-TECC & C-TCCC both recommend calcium therapy during hemorrhagic shock and with blood-product resuscitation, especially after the first transfused blood product. For EMS, the practical takeaway is that calcium is part of supporting clotting and perfusion during major bleeding, especially when blood products are being given. But, the need for hemorrhage control, hypothermia prevention, rapid evacuation to definitive care are still key components to survival.
The trauma triad of death identifies a dangerous physiologic spiral; the diamond broadens that model by adding a modifiable variable that can affect clotting, perfusion, and response to transfusion. Regardless of the need for calcium, always ensure that trauma patients are covered with blankets to retain heat, bleeding is stopped, and oxygen is applied to help fight off acidosis.
***Always follow your local protocols, this is educational material only***
References
Casella, J., & Perry, M. (2024). EMS tactical paramedic lethal triad. In StatPearls. StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK603758/
Committee for Tactical Emergency Casualty Care. (2018). Hypocalcemia and the lethal triad [PowerPoint slides].https://www.c-tecc.org/images/Hypocalcemic-Shock-C-TECC-min.pdf
Deaton, T. G., Montgomery, H. R., & Butler, F. K. (2026). Tactical Combat Casualty Care (TCCC) guidelines: 1 May 2026 updates. Journal of Special Operations Medicine. Advance online publication. https://doi.org/10.55460/J.Spec.Oper.Med.2026.8VSB-B7D7
Wray, J. P., Bridwell, R. E., Schauer, S. G., Shackelford, S. A., Bebarta, V. S., Wright, F. L., Bynum, J., & Long, B. (2021). The diamond of death: Hypocalcemia in trauma and resuscitation. The American Journal of Emergency Medicine, 41, 104–109. https://doi.org/10.1016/j.ajem.2020.12.065