What indicates a casualty may have heatstroke?

Heatstroke is a severe heat-related illness that occurs when the body temperature rises to dangerous levels, typically above 104 degrees Fahrenheit (40 degrees Celsius). One of the hallmark symptoms of heatstroke is the presence of hot, dry skin. Unlike in heat exhaustion or other heat-related illnesses, the body’s mechanisms to cool down, such as sweating, shut down due to extreme heat exposure. As a result, the skin often becomes hot to the touch and devoid of moisture.

This characteristic of hot, dry skin is critical for recognizing heatstroke, as it indicates a failure of the body's usual cooling processes. Other symptoms, like rapid heartbeat, might occur due to the body's attempt to cope with the stress of elevated temperatures, but they do not specifically confirm heatstroke in the same way that the presence of hot, dry skin does. Recognizing this sign is essential for timely intervention, as heatstroke can lead to severe complications if not addressed promptly.