What is the rationale and target of rapid cooling in heat stroke management?

• A. To quickly lower core temperature, typically to below 39°C, preferably around 38°C, using methods like cold water immersion or evaporative cooling with ice packs
• B. To raise core temperature to 40°C to trigger heat shock response
• C. To cool gradually over several hours
• D. To avoid cooling and monitor vital signs

Answer: (A)

In heat stroke, the priority is to remove heat as quickly as possible to limit ongoing brain and organ injury. The best target is to bring the core temperature down rapidly to about 38°C, ideally reaching below 39°C, because faster cooling minimizes the cascade of cellular damage that heat stress triggers. The most effective methods are cold water immersion or evaporative cooling with a fine mist of cool water plus airflow (fans), often with ice packs placed on the neck, armpits, and groin to boost heat transfer. Cold water immersion is the fastest way to achieve a rapid drop in core temperature.

Raising the temperature or cooling it slowly would allow continued cellular injury, while delaying cooling worsens prognosis. So the emphasis is on speed and practicality: start aggressive cooling promptly, monitor core temperature closely, and adjust to avoid overshooting into hypothermia. Transport to definitive care as cooling continues and manage supportive needs (airway, fluids, monitoring) as appropriate.