From Tourniquet to Crush: Mastering Hyperkalemia with Calcium in Prolonged Field Care

In this episode of the Prolonged Field Care Podcast, Dennis sits down with Alex to dissect a controversial claim that calcium is useless for hyperkalemia during cardiac arrest. What started as a social media post that "set his hair on fire" led to a full investigation: reading the primary paper, digging into its references, and uncovering how conclusions can get twisted. They break down the study’s methods, limitations, and real applicability to austere, prehospital, and operational medicine — including crush injuries, medical CPR on base, and why black-and-white social media takes often miss the gray reality of medicine. Topics include cardiac membrane stabilization, physiologic mechanisms, JTS CPGs, confounders in resuscitation research, and why you should always chase the references. Key Takeaways: Calcium doesn’t lower potassium — it stabilizes the cardiac membrane and buys critical time. The referenced paper has significant limitations (small hyperkalemia subgroup, very sick patients, poor outcomes overall) and does not support abandoning calcium. Medicine is gray: knowledge translation lags, and even published papers can overreach conclusions. In austere/prolonged field care, if your teammate is in arrest and it’s safe to act, calcium + bicarb is still worth using while addressing reversible causes (Hs & Ts). Always evaluate studies with PICO, look for confounders, and consider functional outcomes (e.g., Modified Rankin Scale) over simple survival. Peak T-waves are unreliable — treat based on mechanism of injury and clinical suspicion. Whether you’re a tactical medic, flight medic, or austere provider, this episode sharpens your critical thinking and reinforces why calcium remains in the toolkit. Resources & Links: JTS Clinical Practice Guidelines on HyperkalemiaProlonged Field Care website: ⁠www.prolongedfieldcare.org⁠ Subscribe, share with your team, and stay on the bleeding edge of austere medicine. Episode Chapters 00:00 – Intro & Welcome 00:45 – The Social Media Post That Started It: “Calcium is Useless” 02:18 – Knowledge Translation Lag & Gray Areas in Medicine 06:05 – Why Dennis Dug Into the References 08:21 – Does Medical CPR Apply to Operational Medicine? 11:06 – PICO Breakdown of the Study (Taiwan Retrospective Review) 15:50 – Better Outcomes Than Just “Dead vs Alive” – Modified Rankin Scale 17:39 – Study Results: ROSC, Survival, and Neurologic Outcomes 21:08 – Physiology: How Calcium & Sodium Bicarb Actually Work in Hyperkalemia 28:52 – Field Recognition of Hyperkalemia (Crush Injury, Relative Bradycardia) 31:58 – JTS CPGs, Treatment Thresholds (K+ 6.5), and Why Labs Aren’t Everything 35:40 – Very High Potassium Levels & Prognosis in Prolonged Arrest 39:20 – Final Thoughts: Don’t Abandon Calcium Based on Weak Evidence For more content, go to ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.prolongedfieldcare.org⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ Consider supporting us: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠patreon.com/ProlongedFieldCareCollective⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ or ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.lobocoffeeco.com/product-page/prolonged-field-care⁠⁠⁠⁠