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autocorrect="off" autocomplete="off" /><a id="jr-fip-mg" class="wsprkl btn" title="Find"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 550 600" preserveAspectRatio="none"><path fill="none" stroke="#000" stroke-width="36" stroke-linecap="round" style="fill:#FFF" d="m320,350a153,153 0 1,0-2,2l170,170m-91-117 110,110-26,26-110-110"></path></svg></a><a id="jr-fip-done" class="wsprkl btn" title="Dismiss find">✘</a></nav><nav id="jr-fip-info-p"><a id="jr-fip-prev" class="wsprkl btn" title="Jump to previuos match">◀</a><button id="jr-fip-matches">no matches yet</button><a id="jr-fip-next" class="wsprkl btn" title="Jump to next match">▶</a></nav></nav></div><div id="jr-epub-interstitial" class="hidden"></div><div id="jr-content"><article data-type="main"><div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><div class="fm-sec"><h1 id="_NBK603758_"><span class="title" itemprop="name">EMS Tactical Paramedic Lethal Triad</span></h1><p class="contribs">Casella J, Perry M.</p><p class="fm-aai"><a href="#_NBK603758_pubdet_">Publication Details</a></p></div></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><div id="article-158071.s1"><h2 id="_article-158071_s1_">Definition/Introduction</h2><p>Traumatic injuries unleash a cascade of factors contributing to patient peril, warranting thorough examination. This topic explains the lethal triad comprising hypothermia, acidosis, and coagulopathy, pivotal indicators of injury severity and influential determinants of patient fate. These conditions herald heightened mortality rates, highlighting the intricate interplay shaping patient outcomes.<a class="bibr" href="#article-158071.r1" rid="article-158071.r1">[1]</a></p><p>Research reveals the ominous impact of the lethal triad, with a study showcasing a mortality rate of approximately 15% within 6 hours for trauma patients exhibiting these 3 conditions.<a class="bibr" href="#article-158071.r2" rid="article-158071.r2">[2]</a> Conversely, patients devoid of this triad showed no recorded fatalities. Another retrospective study underscored the triad's lethal nature, elucidating a staggering 47.8% mortality rate over 8 years for patients presenting with extreme coagulopathy, hypothermia, and acidosis.<a class="bibr" href="#article-158071.r3" rid="article-158071.r3">[3]</a> These findings underscore the imperative of prompt and adept management, resonating across the continuum of trauma care, from initial on-scene interventions to definitive treatment.</p></div><div id="article-158071.s2"><h2 id="_article-158071_s2_">Issues of Concern</h2><p>
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<b>Hypothermia</b>
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</p><p>In trauma patients, hypothermia is clinically defined as a reduction in the core body temperature to levels below 35 °C (95 °F). This drop in temperature can occur due to several factors, including prolonged exposure to cold environments, the physiological effects of shock, and alterations in metabolic processes. The onset of hypothermia in these patients is particularly concerning due to its impact on enzymatic reactions that are essential for physiological function. This disruption subsequently interferes with coagulation and cellular metabolism, resulting in a decreased ability to form clots and worsening acidosis. A study examining the effects of low-temperature water submersion on rats in hemorrhagic shock found that cold water increased lethal triad incidence and damage to vital organs.<a class="bibr" href="#article-158071.r4" rid="article-158071.r4">[4]</a></p><p>The morbidity and mortality rates associated with the onset of hypothermia in trauma patients are significantly elevated compared to normothermic patients. Hypothermia has a profound impact on various physiological processes, most notably the coagulation system. This disruption to normal blood clotting mechanisms greatly exacerbates the risk of bleeding in these patients. In addition, hypothermia affects other vital physiological functions, further complicating the patient's condition and the medical team's ability to manage the trauma effectively. A study showed a correlation between the presence of hypothermia when a patient arrived at a medical facility and the subsequent outcome, emphasizing that hypothermia at the time of admission is a critical factor that significantly influences the mortality rates among trauma patients compared to normothermic patients. The study demonstrated that hypothermic patients had a mortality rate of 13.5%, whereas normothermic patients had a mortality rate of 2.3%. This significant difference underscores the necessity for rapid identification and management of hypothermia in trauma settings to enhance patient survival chances and overall outcomes.<a class="bibr" href="#article-158071.r5" rid="article-158071.r5">[5]</a><a class="bibr" href="#article-158071.r6" rid="article-158071.r6">[6]</a></p><p>Early recognition of severe hypothermia is crucial to effective management. Treatment should start as soon as possible, especially in the prehospital setting. Management involves utilizing a combination of preventative and active forms of warming approaches. Preventive measures include minimizing or removing exposure, using thermal blankets, and keeping the ambulance and trauma bay temperatures elevated. Active rewarming techniques include warmed intravenous fluids, forced-air warming systems, and peritoneal lavage with warm fluids.<a class="bibr" href="#article-158071.r7" rid="article-158071.r7">[7]</a></p><p>
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<b>Acidosis</b>
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</p><p>Acidosis is a critical condition in trauma care characterized by a blood pH level of less than 7.35. This condition is typically identified and assessed through a comprehensive analysis of arterial or venous blood gas measurements. In trauma patients, acidosis commonly manifests as lactic acidosis, a direct consequence of tissue hypoxia, which is itself a result of hypovolemia or inadequate tissue perfusion. Other concurrent conditions, such as hypothermia and coagulopathy, often intensify the severity and impact of acidosis in patients. Hypothermia can impair metabolic processes, further aggravating the body's acid-base imbalance. Similarly, coagulopathy can also contribute to the complexity and severity of acidosis. This interplay between acidosis, hypothermia, and coagulopathy in trauma patients creates a challenging clinical scenario, necessitating careful and prompt management to mitigate their combined detrimental effects on patient outcomes.<a class="bibr" href="#article-158071.r8" rid="article-158071.r8">[8]</a></p><p>The presence of acidosis, particularly severe acidosis (pH <7.0), is significantly associated with increased mortality rates in trauma patients. A study demonstrated that patients with a pH of less than 7.0 had a 3-fold higher mortality rate compared to those with a pH of 7.0 or higher. However, this study also determined that there is no specific pH threshold below which the mortality was 100%, indicating that even severe acidosis can be recoverable in some cases.<a class="bibr" href="#article-158071.r9" rid="article-158071.r9">[9]</a></p><p>Managing acidosis in trauma patients should be focused on correcting the underlying cause of the acidosis, which is typically hemorrhage or organ dysfunction due to poor perfusion. Methods for correcting acidosis include aggressive fluid resuscitation, blood transfusions, and vasoactive medications. These methods improve tissue perfusion and oxygenation of end organs, allowing for a correction of acidosis. Temporary measures such as sodium bicarbonate administration may be employed, but the acidosis persists unless the underlying cause is corrected. In these cases, it is critical to continue monitoring and managing other aspects of the lethal triad, as acidosis can exacerbate coagulopathies and bleeding. Another study revealed an associated increase in mortality in trauma patients with a pH of 7.2 or lower, suggesting that maintaining the patient's pH above 7.2 may be a suitable treatment goal.<a class="bibr" href="#article-158071.r10" rid="article-158071.r10">[10]</a></p><p>
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<b>Coagulopathy</b>
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</p><p>Trauma-induced coagulopathy is a complex condition that occurs in trauma patients and is also associated with increased mortality rates. Trauma-induced coagulopathy can manifest as a spectrum ranging from bleeding to thrombotic conditions. This coagulopathy type occurs due to tissue damage and shock and is distinct from the disseminated intravascular coagulation observed in other conditions. Considering trauma-induced coagulopathy as a separate entity requiring a rapid diagnosis and targeted interventions is crucial.<a class="bibr" href="#article-158071.r11" rid="article-158071.r11">[11]</a><a class="bibr" href="#article-158071.r12" rid="article-158071.r12">[12]</a><a class="bibr" href="#article-158071.r13" rid="article-158071.r13">[13]</a></p><p>The causes of trauma-induced coagulopathy include tissue trauma, shock, and inflammation. These factors initiate a cascade of events leading to coagulation impairment. Trauma-induced coagulopathy is often exacerbated by iatrogenic factors, including fluid administration, hypothermia, metabolic acidosis, and dilutional coagulopathy, any of which may be the result of resuscitation efforts. Trauma-induced coagulopathy's pathophysiology remains incompletely understood, making ongoing research and development of effective management strategies necessary.<a class="bibr" href="#article-158071.r14" rid="article-158071.r14">[14]</a><a class="bibr" href="#article-158071.r15" rid="article-158071.r15">[15]</a></p><p>Trauma-induced coagulopathy has a significant association with elevated morbidity and mortality rates. Patients with trauma-induced coagulopathy often require additional transfusions, placing them at a higher risk of mortality in a dose-dependent manner. The presence of trauma-induced coagulopathy indicates a severe trauma state that often necessitates intensive care and prolonged hospitalization. Trauma-induced coagulopathy is also associated with an increased risk of complications such as multiorgan failure. According to a study, patients with a prothrombin time ratio greater than 1.2 had a significantly higher mortality rate compared to those with a normal prothrombin time ratio (22.7% versus 7.0%, respectively).<a class="bibr" href="#article-158071.r15" rid="article-158071.r15">[15]</a><a class="bibr" href="#article-158071.r16" rid="article-158071.r16">[16]</a></p><p>In clinical management, healthcare professionals should focus on addressing the underlying causes of coagulopathy and maintaining hemostasis. The presence of coagulopathy can be determined using various blood tests, including prothrombin time, activated partial thromboplastin time, international normalized ratio, fibrinogen level, platelet count, D-dimer, rotational thromboelastometry, or thromboelastography. Once coagulopathy is diagnosed, management typically involves 1 or more of the following interventions—massive transfusion, tranexamic acid, viscoelastic hemostatic assays, coagulation factors, and fibrinogen concentrates. However, there is ongoing debate regarding the ideal transfusion ratio and the optimal utilization of various interventions. Hospitals often tailor their approaches based on available resources and establish local guidelines for effective management.<a class="bibr" href="#article-158071.r11" rid="article-158071.r11">[11]</a><a class="bibr" href="#article-158071.r17" rid="article-158071.r17">[17]</a></p></div><div id="article-158071.s3"><h2 id="_article-158071_s3_">Clinical Significance</h2><p>The lethal triad of hypothermia, acidosis, and coagulopathy remains a critical concern in trauma care, significantly impacting patient outcomes. Hypothermia, characterized by a core body temperature below 35 °C, disrupts enzymatic reactions, including clot formation and metabolism, worsening acidosis, and coagulopathy. Acidosis, indicated by a pH below 7.35, commonly occurs due to poor perfusion and tissue hypoxia, further exacerbating coagulopathy. Trauma-induced coagulation, distinct from other coagulation disorders, is assessed using various blood tests that indicate a disruption of 1 or multiple components of the coagulation pathway. A multidisciplinary, evidence-based approach is essential for effectively managing these interrelated conditions.</p><p>Hypothermia is managed utilizing a combination of preventative and active forms of warming. Preventive measures include minimizing or removing exposure, using thermal blankets, and maintaining elevated ambient temperatures in ambulances and trauma bays. Active rewarming techniques include warmed intravenous fluids, forced-air warming systems, and peritoneal lavage with warm fluids. Acidosis management focuses on restoring tissue perfusion and oxygenation, often requiring fluid resuscitation and blood transfusions. Coagulopathy is managed through blood product transfusions, such as fresh frozen plasma and platelets, and medications, such as tranexamic acid.</p><p>These interventions are crucial for interrupting the exacerbating cycle of the lethal triad and improving patient outcomes. Successful management of the lethal triad requires an integrated approach involving prehospital care from emergency medical technicians and paramedics, along with various hospital specialties such as emergency medicine, surgery, and critical care. Ongoing research and education are also necessary to further improve the care of trauma patients affected by this challenging condition combination.</p></div><div id="article-158071.s4"><h2 id="_article-158071_s4_">Review Questions</h2><ul><li class="half_rhythm"><div>
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</div></li></ul></div><div id="article-158071.s5"><h2 id="_article-158071_s5_">References</h2><dl class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.</dt><dd><div class="bk_ref" id="article-158071.r1">Borowko R, Vignon PO, Lutz N, Maillot A, Lefort H. [The lethal triad of hemorrhage]. <span><span class="ref-journal">Rev Infirm. </span>2021 Aug-Sep;<span class="ref-vol">70</span>(273):16-18.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/34446227" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 34446227</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>2.</dt><dd><div class="bk_ref" id="article-158071.r2">González Balverde M, Ramírez Lizardo EJ, Cardona Muñoz EG, Totsuka Sutto SE, García Benavides L. 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Determining the utility of metabolic acidosis for trauma patients in the emergency department. <span><span class="ref-journal">J Emerg Med. </span>2015 Jun;<span class="ref-vol">48</span>(6):693-8.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/25802159" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 25802159</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>9.</dt><dd><div class="bk_ref" id="article-158071.r9">Ross SW, Thomas BW, Christmas AB, Cunningham KW, Sing RF. Returning from the acidotic abyss: Mortality in trauma patients with a pH < 7.0. <span><span class="ref-journal">Am J Surg. </span>2017 Dec;<span class="ref-vol">214</span>(6):1067-1072.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/29079021" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 29079021</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>10.</dt><dd><div class="bk_ref" id="article-158071.r10">Corwin GS, Sexton KW, Beck WC, Taylor JR, Bhavaraju A, Davis B, Kimbrough MK, Jensen JC, Privratsky A, Robertson RD. Characterization of Acidosis in Trauma Patient. <span><span class="ref-journal">J Emerg Trauma Shock. </span>2020 Jul-Sep;<span class="ref-vol">13</span>(3):213-218.</span> [<a href="/pmc/articles/PMC7717465/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC7717465</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/33304072" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 33304072</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>11.</dt><dd><div class="bk_ref" id="article-158071.r11">Ho VK, Wong J, Martinez A, Winearls J. 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<b>Disclosure: </b>Joshua Casella declares no relevant financial relationships with ineligible companies.</p></div></dd></dl><dl class="bkr_refwrap"><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Matthew Perry declares no relevant financial relationships with ineligible companies.</p></div></dd></dl></dl></div></div></div><div class="fm-sec"><h2 id="_NBK603758_pubdet_">Publication Details</h2><h3>Author Information and Affiliations</h3><p class="contrib-group"><h4>Authors</h4><span itemprop="author">Joshua Casella</span><sup>1</sup>; <span itemprop="author">Matthew Perry</span><sup>2</sup>.</p><h4>Affiliations</h4><div class="affiliation"><sup>1</sup> Conemaugh Memorial Medical Center</div><div class="affiliation"><sup>2</sup> Virginia College of Osteopathic Medicine</div><h3>Publication History</h3><p class="small">Last Update: <span itemprop="dateModified">May 5, 2024</span>.</p><h3>Copyright</h3><div><div class="half_rhythm"><a href="/books/about/copyright/">Copyright</a> © 2025, StatPearls Publishing LLC.<p class="small">
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This book is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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http://creativecommons.org/licenses/by-nc-nd/4.0/
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</a>), which permits others to distribute the work, provided that the article is not altered or used commercially. You are not required to obtain permission to distribute this article, provided that you credit the author and journal.
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</p></div></div><h3>Publisher</h3><p><a href="https://www.statpearls.com/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">StatPearls Publishing</a>, Treasure Island (FL)</p><h3>NLM Citation</h3><p>Casella J, Perry M. EMS Tactical Paramedic Lethal Triad. [Updated 2024 May 5]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. <span class="bk_cite_avail"></span></p></div><div class="small-screen-prev"></div><div class="small-screen-next"></div></article></div><div id="jr-scripts"><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/libs.min.js"> </script><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.min.js"> </script></div></div>
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