Post-Cooling Resuscitation and Monitoring in Exertional Heat Stroke

Successful immersion cooling can create a false sense that the emergency is over. In exertional heat stroke, the period immediately after cooling carries its own risks that monitoring protocols need to catch.

Overshoot and rebound

Aggressive immersion cooling can occasionally drive core temperature below the intended target if immersion continues without close monitoring, leading to overshoot hypothermia. Conversely, stopping cooling too early risks a temperature rebound as heat redistributes from the body's core and periphery. Continuous temperature monitoring, ideally rectal or esophageal rather than oral or tympanic, is what allows a team to stop immersion at the correct point rather than by estimation.

What to watch for after immersion stops

Even once core temperature is controlled, exertional heat stroke patients need monitoring for the downstream effects of the hyperthermic episode: acute kidney injury, liver dysfunction, coagulopathy, and rhabdomyolysis. These complications may not be apparent immediately and are the reason hospital observation, not just field cooling, remains part of the standard of care.

Neurological reassessment

Mental status typically improves as core temperature normalizes, but persistent confusion, seizure activity, or a failure to regain normal consciousness after cooling is a red flag for more severe central nervous system involvement and should accelerate transport and advanced care, per Walter & Carraretto's review of hyperthermia's neurological consequences.

Equipment that supports monitoring, not just cooling

Continuous monitoring during immersion requires physical access to the patient, not just to a wrapped or bagged limb. The Kollder emergency cooling tub's open design gives responders 360° access to the patient throughout immersion, supporting vitals checks and temperature probe placement without interrupting cooling. More at kollder.com/#contact.

Further Reading

• Exertional Heat Stroke: Organ Consequences
• Douglas Casa: Exertional Heat Stroke Is Survivable
• Réanimation et surveillance post-refroidissement (FR)
• Request a Kollder Quote

Sources: Walter EJ & Carraretto M, Critical Care, 2016, ACSM Expert Consensus Statement, 2023, Korey Stringer Institute.