As temperatures rise, the body’s subcutaneous blood vessels dilate and blood flow to the skin increases exponentially. High temperatures increase the risk of sudden death “Sudden death can be simply categorized into two types, sudden cardiac death and non-cardiac sudden death.” Sudden cardiac death accounts for 80 to 90 percent of sudden death cases. About the factors that trigger sudden cardiac death can be divided into two kinds, one is the triggering factors, such as mental tension, strenuous exercise, overwork, bad lifestyle and habits, like smoking, alcoholism, overeating; the other is its own physical causes, such as congenital heart disease, and so on. From the past cases of sudden death in high temperature, even the heart healthy people, there is also the possibility of morbidity. Summer with rising temperatures, the human body subcutaneous blood vessel expansion, skin blood flow than usual increased by 3 to 5 times, back to the heart blood flow is also significantly increased, is bound to aggravate the burden on the heart; at the same time, summer sweating, the human body water through the sweat a lot of evaporation, the blood viscosity rises, resulting in ischemia or blockage of blood vessels in the heart and brain, and in severe cases, can lead to heart attacks or strokes. “Many people usually ignore minor problems, do not go to the hospital to check, not to mention timely treatment, is also a morbidity hidden danger.” In fact, sudden heart attack patients, 50% are aura, such as chest tightness, chest pain, back pain, sweating, etc., some patients can also appear abdominal pain, dizziness, diarrhea and other atypical symptoms, clinical easier to misdiagnose. Water in time to make up for sleep to be enough “hot weather must avoid continuous work for more than 3 hours, and timely to the ventilation to help cool down.” To develop a good habit of drinking more water, while paying attention to the intake of salt and vitamins. Otherwise, when the body sweats a lot, the body’s water and potassium, sodium and other large loss, it is easy to appear water and salt metabolism disorders. “Summer nights are hot and dry, the days are long and the nights are short, and people can’t sleep well, which is also prone to cardiovascular and cerebrovascular diseases.” Although summer is not a good time to sleep, but we should also pay attention to maintain sufficient sleep so that the brain is fully rested, “many people will frequently go in and out of the air-conditioned room, some people come back from the outside, immediately take a cold shower, blowing air-conditioning, eat ice cream, drink cold drinks, a cold and hot stimulation will make the sympathetic nerves excited, but also lead to violent vascular contraction and accidents, the scientific The practice is to dry the sweat on the body first, drink some warm water, rest for a while, and then take a warm bath.” “Once there is a sudden fainting sudden death, the family can not be too busy to carry, but should let the patient lie down on the spot, do not turn over, do not let it talk and walk, not to mention shaking the patient.” Tao Hailong said, if the family will artificial respiration, CPR and other first aid, can be taken immediately, but pay attention to the way of operation, so as not to play a counterproductive. Also quickly call 120 for help.