What is the immediate priority care for heat stroke after calling 9-1-1?

The immediate priority care for heat stroke, after calling 9-1-1, is to immerse the person up to the neck in cold water. This method is the most effective way to rapidly reduce the body temperature of someone experiencing heat stroke, which is a life-threatening condition caused by prolonged exposure to high temperatures, often in combination with dehydration.

Immersion in cold water allows for effective heat exchange, rapidly dissipating excess body heat and helping to cool the person down in a safe and controlled manner. The cooling effect is significantly greater with immersion than with other methods, which may be less effective or slower to bring down the body temperature.

In contrast, applying ice packs, providing water to drink, or wrapping the person in towels may not effectively lower the body temperature as quickly. Ice packs can cause localized cooling but may not address overall body heat. Offering water could be dangerous if the person is not conscious or able to swallow safely, as it poses a choking risk. Wrapping in towels may provide comfort but does not actively cool the individual. Therefore, immersing the person up to the neck in cold water is the preferred and most immediate action.