A colleague has fainted with dry, hot, and mottled skin. What condition is he likely suffering from?

In the scenario described, the individual displaying symptoms of fainting, along with dry, hot, and mottled skin, is likely suffering from heat stroke. This is a severe form of heat illness that occurs when the body overheats, typically due to prolonged exposure to high temperatures and/or strenuous physical activity in high heat and humidity.

In heat stroke, the body's temperature regulation fails, which can lead to a core body temperature that rises to critical levels, often above 104°F (40°C). The fact that the skin is dry and hot is significant; during heat stroke, the body's ability to sweat is impaired, resulting in a lack of perspiration. This differentiates it from heat exhaustion, where sweating typically occurs and skin may appear cool and clammy.

Additionally, mottled skin indicates poor circulation and vasodilation, which can occur as the body tries to compensate for extreme heat and the body’s attempts to cool itself fail. As heat stroke progresses, it can lead to serious complications, including organ damage and even death if not treated promptly.

Understanding these symptoms and their implications is crucial for providing effective first aid and ensuring immediate medical assistance to the affected person.