Exertional Heat Stroke in a Firefighter During Live-Fire Training
A 34-year-old career firefighter with 12 years of service collapsed during a live-fire training exercise on a hot day (ambient 36 °C, gear ensemble 25 kg). After about 40 minutes of repeated evolutions he became confused and could not stand. On scene his core temperature was 40.2 °C, pulse 140, and BP 100/60, with cool clammy skin. He was confused and combative and was transported after receiving 6 L of IV crystalloid. Initial labs: CK 12,000 U/L, creatinine 1.3 mg/dL, sodium 132 mmol/L, platelets 110,000, ALT 90, and dark urine. He was admitted for 48 hours and recovered. Ten days later he is asymptomatic; CK is 410, creatinine 0.9, and he wants to return to full duty in two weeks, including interior firefighting and SCBA use. He had one prior episode of heat exhaustion two years ago.
1. Is he ready to return to full duty in two weeks? What evaluation and conditions should govern the decision?
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This was exertional heat stroke, not heat exhaustion: core temperature above 40 °C with central nervous system dysfunction (confusion, combativeness). Return to interior firefighting should not be automatic at 10 days. Before full duty he needs resolution of acute organ injury - CK is still above normal at 410, though falling, and creatinine and platelets have normalized. He also needs a supervised return-to-work progression with heat acclimatization, and a heat tolerance test is reasonable given the severity and the prior heat episode. NFPA 1582 treats a history of heat stroke as a condition requiring individual evaluation, focusing on residual thermoregulatory impairment or end-organ damage. A practical plan is restricted duty without SCBA or interior work for 2–4 weeks, gradual heat exposure, repeat labs, and reassessment before full clearance.
2. What long-term health surveillance and risk factors should be addressed?
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Heat stroke survivors have increased risk of recurrent heat illness and possibly chronic kidney injury, particularly with repeated episodes, dehydration, and NSAID use. There is growing evidence linking repeated occupational heat exposure to chronic kidney disease. He should have annual creatinine and eGFR, urinalysis, and blood pressure surveillance, plus education on hydration, sleep, and early symptom recognition. His prior heat exhaustion suggests modifiable risk factors - fitness, acclimatization status, medications, alcohol, and work-rest patterns - that should be reviewed. A heat tolerance test before return and a fitness-for-duty evaluation that includes cardiovascular risk assessment would strengthen the decision and document the reasoning.
3. What changes should the department make to its training and heat illness prevention program?
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Institute a mandatory acclimatization protocol for live-fire training, with progressive exposure over 5–14 days, especially for new or returning firefighters. Use work-rest cycles guided by WBGT, schedule training outside peak heat where possible, and provide on-scene cooling such as ice slurry or cold-water immersion. Add pre- and post-evolution vital signs, a rehabilitation sector, and a buddy system. Review PPE donning and doffing, fluid availability, and medical monitoring. Treat the event as a near-miss, document it, and revise the training plan. The prior heat exhaustion should have prompted earlier review, so the program should include a mechanism for flagging recurrent heat events.