288: Blood, Citrate & Cardiac Chaos – Rethinking Calcium in Prolonged Field Care

In this episode of the Prolonged Field Care Podcast, Dennis sits down with Dr. Andre Cap to unpack the evolving role of calcium in trauma resuscitation. What started as the “new hotness” in forward blood transfusion protocols has become far more nuanced. They discuss the dangers of both hypocalcemia and hypercalcemia, how citrate in all blood products binds ionized calcium, cardiac effects, recent observational data showing worse outcomes with hypercalcemia, and practical guidance for when, how, and how much calcium to give in austere and prolonged field care environments.

Whether you’re running a Role 2, working prolonged field care, or just trying to keep your patient alive until definitive care, this episode challenges long-held assumptions and offers field-practical recommendations.

Key Takeaways:

• All blood products contain citrate, which binds ionized calcium — expect hypocalcemia with significant transfusion.
• Both hypo- and hypercalcemia are bad; recent data shows hypercalcemia is associated with worse mortality than hypocalcemia.
• Current TCCC guidance (1g calcium after first unit) was written to fix under-use; it may now be too aggressive in some scenarios.
• Give calcium after blood products, not before. Consider waiting until after 2+ units in most cases.
• Slow IV push (over ~5 minutes) through a confirmed good peripheral line; calcium chloride is a vesicant — use caution (gluconate is safer).
• Avoid calcium chloride via IO if possible. Titrate to clinical response when monitoring isn’t available.
• In refractory shock you can give more, but don’t give calcium as a standalone resuscitation drug — it can be harmful without volume replacement.
• Ideal future state: Bring i-STAT capability forward when feasible and get better RCT data.

Perfect for medics, PAs, physicians, and anyone managing hemorrhagic shock in austere environments.

Links:⁠www.prolongedfieldcare.org⁠ | @prolonged_field_care

Podcast Chapters (with Timestamps):

• 00:00 – Intro & Welcome
• 00:39 – Why Calcium Became “The New Hotness” in Trauma Care
• 01:18 – The Joint Trauma System Audit That Started It All
• 03:46 – Citrate in Every Blood Product – The Science Behind the Bind
• 05:44 – Why We Actually Care: Cardiac Repolarization, Contractility & Vascular Tone
• 08:49 – Hypocalcemia vs Hypercalcemia in Trauma Patients
• 10:21 – Shocking New Data: Hypercalcemia Carries Higher Mortality
• 13:14 – TCCC Guidelines – After First Unit? Is This Too Aggressive?
• 14:03 – When Should You Actually Give Calcium in the Field?
• 19:34 – Clinical Triggers Without Monitoring + Dosing Strategy
• 24:56 – Safety First: IV Patency, Calcium Chloride vs Gluconate, IO Concerns
• 28:44 – When to Stop Giving Calcium & Avoiding Over-Correction
• 32:00 – Historical Lessons: When Calcium Alone Made Things Worse
• 33:39 – Practical PFC Recommendations & Final Thoughts
• 38:04 – Closing & Where to Find More

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