Hyperthermia (heat stroke) is distinguished by what finding?

• A. Skin cool and clammy
• B. Sweating present with normal skin color
• C. Temperature remains below 100°F
• D. Temperature reaches 105°F or higher and skin is dry

Answer: (D)

Hyperthermia (heat stroke) is identified by a body temperature that rises to a very high level, typically around 105°F (40.6°C) or higher, with the skin becoming dry because sweating has stopped. This dry skin and extreme fever reflect the body's thermoregulation failure and indicate CNS involvement, which is why heat stroke is a medical emergency. In contrast, heat exhaustion usually presents with sweating and cool, clammy skin, and a lower or only mildly elevated temperature, while temperatures below about 100°F don’t indicate heat stroke. The dry skin combined with the very high fever is the standout finding that sets heat stroke apart and signals the need for urgent cooling and medical care.