In fact, "heat death" is not just a casual talk. It is very dangerous to be exposed to high temperatures for a long time ↓↓ "Heat stroke" is an important keyword. It is understood that many deaths under high temperatures are caused by "heat stroke" So, what is heat stroke.

What would you like to say is the hottest thing recently?

Of course it’s the weather!

In the past few days, the high temperature has continued in most parts of the country.

The "sauna day" mode has been turned on.

People have lamented that such a hot day is caused by the air conditioner!

In fact, "heat kills people" is not just a casual saying

Long-term exposure to high temperatures is very dangerous ↓↓

" Heat stroke " is an important keyword

It is understood that many death cases under high temperatures

I got "heat stroke"

So, what is heat stroke? What is the relationship between

and heat stroke? Is

really as scary as the news says?

Today, let’s learn about it together!

What is heat stroke?

Heat stroke, also known as severe heat stroke, is a very dangerous emergency with a very high mortality rate of 40% to 50%. For people over 50 years old, the mortality rate even reaches about 70%.

The human body has a body temperature regulation center. Under normal circumstances, it will adjust the balance of heat production and heat dissipation in the body to maintain the body temperature at around 37°C.

But in some cases, this balance of production and heat dissipation will be broken, causing heat to accumulate in the body, causing heat stroke.

Generally speaking, human body heat dissipation mainly relies on radiation, evaporation and a small amount of convection and conduction.

When the ambient temperature is higher than the skin temperature, the human body can only rely on evaporation and sweating to remove heat. However, when the temperature is too high, the heat dissipation capacity will decrease (this phenomenon is called sweat exhaustion), and heat accumulation will occur in the body, resulting in The organs, especially the brain, "go out of control" and heat stroke occurs.

Heat stroke is caused by the rapid accumulation of heat in the body. Patients often experience symptoms such as local muscle spasm, high fever, no sweat , dry mouth, coma, difficulty breathing, and even respiratory failure, which is the most fatal form of heatstroke.

In addition to individual factors, the incidence of heat stroke is closely related to three factors: high temperature, high humidity and a closed, windless environment.

Generally mild heatstroke occurs, with the body temperature often exceeding 38°C, accompanied by symptoms such as facial flushing, profuse sweating, burning skin, nausea and vomiting, or cold limbs, pale face, decreased blood pressure, and rapid pulse.

and The difference between heat stroke and heat stroke is that it manifests as high fever (rapid rise in body temperature), often no sweating, and even coma and shock.

Heat stroke is usually accompanied by a body temperature as high as 40℃ or above. What changes will happen to the body at this time?

What happens when the body temperature reaches 40°C?

As we all know, the highest scale of a thermometer reaches 42°C. Will people be "burned to death" if the temperature exceeds this temperature?

When the human body temperature is 37°C, the body's heat production and heat dissipation are relatively balanced, and the body's functions are the most stable. can also have an adjustment mechanism when body temperature rises, but when it exceeds a certain limit, it will lead to organ intolerance and organ failure.

For example, for the heart, when the body temperature exceeds 37°C and gradually rises to over 40°C, cardiac output will increase exponentially, oxygen consumption will also increase by about 40%.

But when the body temperature reaches 42°C, cardiac output and oxygen consumption will suddenly decrease, and myocardial necrosis will occur.

This is caused by ultrahigh temperature exceeding the tissue tolerance limit, causing organ failure. Apparently, this is life-threatening.

Normally, if the fever reaches 39℃, one would almost become suspicious of life. What kind of disease can cause the fever to reach 42℃? The answer is heat cramps, heat exhaustion, and heat stroke. Heat stroke is the most serious.

Which groups of people

should pay special attention to heat stroke?

Heat stroke is most likely to occur in the elderly, children, pregnant women or people with underlying diseases (such as cardiovascular and cerebrovascular diseases, obesity).

The body functions of the elderly decline, and cardiac output cannot be adjusted in high temperature environments, leading to heat stroke due to circulatory disorders. Children often suffer from heatstroke due to poor sweat response.

In addition, people with colds, fever, gastroenteritis diarrhea and hypokalemia are also prone to heat stroke.

How to provide correct rescue if heat stroke

occurs?

Move the patient to a cool and ventilated place as soon as possible, then let him lie down, physically cool him down, replenish water (salt water is best), etc. At the same time, call 120 for emergency treatment in a timely manner, and the treatment cannot stop during the emergency treatment.

How to prevent heat stroke?

Outdoors, the main objective factors that affect people's heat stroke are: daily average temperature, relative humidity and maximum temperature.

If the daily average temperature is >30°C and the relative humidity is >73%, the probability of heat stroke will show an obvious upward trend. If is added to : the maximum temperature is ≥37°C, the number of heat strokes will increase dramatically. If you meet two of the conditions before going out, you should pay attention.

In addition, it should also be noted that the alternation of hot and cold can also easily cause heat stroke. The body cannot adapt to it all of a sudden, and there may also be body temperature regulation disorders, water and electrolyte balance imbalances, and heat stroke neurological disorders.

For people who need to work outside for a long time or whose working environment is hot and airtight, it is best to prepare some salt water, ice cubes, etc. in advance.

In addition, when people suffer from heat stroke, they usually show signs of heat stroke, which generally include symptoms such as headache, dizziness, thirst, excessive sweating, and weakness in the limbs.

If it is moved to a cool and ventilated place in time, physically cooled down and replenished with water (salt water is best), it can recover in a short time.

Pay attention to getting enough sleep and drinking plenty of water. When there is a high temperature warning, go out as little as possible.

would like to emphasize that when

heat stroke symptoms are severe, you must not be careless

it can really kill you!

Pay attention to the rhythm when cooling down and replenishing water.

When performing physical cooling, it must be done quickly

When replenishing water, it should be appropriate. Too fast is not good.

• end •

Source: Popular Science China Anhui Daily WeChat Public Account

Review | Manana Responsibility Editor | Hou Lijuan Editor | Guo Xingyu

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