High temperature heatstroke prevention beware of these two situations.

　　Go out for two minutes and sweat for two hours. Recently, the temperature in Guangzhou has hit record highs, and the number of patients seeking medical treatment for heatstroke is also increasing. AARON Li, director of emergency medicine department of the Third Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, and Ke Jiayou, the attending physician, reminded us.

　　Beware of indoor heatstroke in the elderly

　　Many people think that heatstroke will happen as long as the temperature rises, but it is not. The onset of heatstroke is closely related to three environmental factors: high temperature, high humidity and windless environment. When people are in a high temperature environment, the heat dissipation function becomes worse, or the heat production increases, which will lead to heatstroke. Generally speaking, the meteorological threshold of heatstroke is the daily average temperature > 30℃ or the relative humidity > 73%. When temperature and humidity conditions exist at the same time, the incidence of heatstroke increases obviously; When the daily maximum temperature is ≥37℃, the number of people suffering from heatstroke increases sharply.

　　The doctor reminded that it is best to pay attention to the weather forecast before going out, reduce outdoor activities at noon or when the sun is strong, and arrange outdoor activities in the early morning or evening.

　　It is best to have a thermometer and hygrometer at home. If the temperature and humidity are too high, turn on the air conditioner in time to cool down. This is especially important for the elderly who live alone. The function of the thermoregulatory center of the elderly is reduced, and their sensitivity to temperature changes is reduced. If they live alone and seldom go out, they may suffer from heatstroke because they don’t realize that the indoor temperature is too high. If this hot weather continues, family members of the elderly or street social workers should strengthen their visits to prevent heatstroke.

　　According to AARON Li, the elderly with poor self-care ability are the high-risk group of heatstroke. Another reason is that the elderly are more likely to suffer from basic diseases (weakness, mild liver and kidney dysfunction, hypernatremia/hyponatremia) or obesity, and heat is only the cause of heatstroke. This part of the elderly have poor ability to regulate body temperature, and if they have obesity problems, their heat dissipation ability is also poor. If you are in a high temperature, high humidity, and unventilated environment, you may even have a heat stroke, which is dangerous to disability and death.

　　Lack of sleep is more likely to cause heatstroke.

　　When Mr. Li, 38, went climbing with his friends during the Dragon Boat Festival, he developed symptoms such as sweating, headache, aching limbs and weakness. He didn’t understand why he had climbed mountains in hot weather before, and why something went wrong this time. Later, I learned that he had insomnia the day before climbing the mountain, and he suffered from heatstroke the next day as planned.

　　AARON Li answered that in a high temperature environment, there are dehydration manifestations such as illness, fever, or vomiting and diarrhea; Lack of sleep causes decreased resistance; When obese people cause individual factors such as elevated metabolism, they are more prone to heatstroke.

　　In addition, heatstroke often occurs in heavy physical activity (such as soldiers, athletes, firefighters, construction workers, etc.), the elderly, people with basic diseases (such as hypohidrosis and serious skin diseases), weak or bedridden people, infants, alcoholics or drug addicts, pregnant women, etc.

　　Sometimes the temperature does not exceed 30℃, but due to special clothes (such as clothes with poor air permeability, chemical protective clothing, nuclear radiation protective clothing, fire protective clothing, etc.), special posts (such as high-temperature operations such as fire fighting) or special environments (such as greenhouses, closed factories, carriages, and operation rooms), the local temperature often exceeds 30℃, and it is also easy to suffer from heatstroke. These groups should also pay attention. (Reporter Chen Hui correspondent Wang Jian)