Heat stroke occurs when the core body temperature rises above 40°C and is a life-threatening condition. The symptoms of heat exhaustion progress to include headache, nausea and vomiting. Neurological manifestations include a coarse muscle tremor and confusion, aggression
or loss of consciousness. The patient’s skin feels very hot, and sweating is often absent due to failure of thermoregulatory mechanisms. The patient should be resuscitated with rapid cooling by spraying with water, fanning and ice packs in the axillae and groins. Cold crystalloid intravenous fluids are given but solutions containing potassium should be avoided. With appropriate treatment, recovery from heat stroke can be rapid (within 1–2 hours).