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Cold-Water Dousing with Ice Massage to Treat Exertional Heat Stroke: A Case Series

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McDermott BP, Casa DJ, O’Connor FG, Adams WB, Armstrong LE, Brennan AH, Lopez RM, Stearns RL, Troyanos C, Yeargin SW. Cold-water dousing with ice massage to treat exertional heat stroke: a case series. Aviat Space Environ Med 2009; 80:720–2.

Introduction: We sought to determine the rate of cooling via a novel water ice therapy (WIT) as an alternative to cold-water immersion for the acute treatment of exertional heat stroke (EHS). Methods: Observations were made at the 2004-2008 Marine Corps Marathons (mean ± SD: 16.3 ± 4.9°C dry bulb, 32 ± 6% RH). Nine (seven men, two women) EHS patients (33 ± 6 yr of age; 268 ± 54 min average race time for six who finished) were observed during on-site treatment. Patients were treated while lying supine on a porous stretcher resting on a tub filled with cold water (~10-12°C). Medical personnel monitored Tre, doused the patient with water and massaged major muscle groups with ice bags until Tre decreased to 38.9°C. Patients were not immersed in water. Serial Tre and time were used to calculate cooling rates. Results: Final Tre (39.12 ± 0.63°C) was significantly lower than initial Tre (41.43 ± 0.71°C, P < 0.05). Cooling rates were 0.13 ± 0.04°C · min−1. The decrease in Tre for the initial 6 min of WIT (0.38 ± 0.13°C) was significantly less than for the subsequent 6-min time period (1.31 ± 0.34°C, P < 0.001). Cooling rates for these time periods were significantly different (0.06 ± 0.02°C · min−1 and 0.22 ± 0.06°C · min−1, respectively, P < 0.05). Initial Tre was not correlated with overall cooling rate (r = 0.434, P = 0.244), or total cooling time required (17 ± 4 min; r = 0.207, P = 0.593). Survival rate was 100%. Conclusion: WIT provided cooling rates that were 70% as effective as those published for cold-water immersion with 8°C water (0.19°C · min−1) and resulted in 100% patient survival.
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Keywords: cold-water immersion; heat illness; hyperthermia; whole-body cooling

Document Type: Short Communication

Publication date: August 1, 2009

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