heat collapse

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Loss of consciousness associated with hot environmental conditions or exercising in clothing that restricts heat loss and causes overheating. Excessive sweating and an increase in the flow of blood to the skin and muscles reduces blood flow to the brain to cause fainting. Heat collapse is one of the most common medical conditions on a hot day. Nevertheless, its dangers should not be underestimated since it can lead to heat exhaustion and heat stroke. Uncomplicated heat collapse often occurs when a person stands for long periods in very hot conditions. Sufferers usually respond rapidly if they lie down, elevate their legs, drink plenty of fluid, and are sponged down with tepid water. However, if loss of consciousness continues heat stroke should be suspected and medical advice sought.

Loss of consciousness associated with hot environments or exercising in clothing that restricts heat loss and causes overheating. Excessive sweating and shunting blood to the skin and muscles, reduces blood flow to the brain, causing fainting. Heat collapse is one of the commonest medical conditions on a hot day and is exacerbated by standing for long periods. It is potentially dangerous because it can lead to heat exhaustion and heat stroke. Uncomplicated heat collapse often occurs when individuals stand for long periods in a very hot environment. Recovery is usually quick if the sufferer lies down with legs elevated, is given a watery drink, and is sponged with tepid water. However, if the sufferer loses consciousness and has a high rectal temperature (41 °C or above), heat stroke should be suspected until a medical diagnosis proves otherwise.