Why can't you hide under the tree in thunderstorm weather?

At 2 am on June 26th, 2004, after a sudden lightning strike, Du Qian Village, duqiao town, Linhai City, Zhejiang Province became a sad ocean. Thirty villagers in Du Qian Village and nearby villages were suddenly struck by lightning while sheltering from the rain under Metasequoia trees.

It is right to choose to stay in the ravine and stay where you are during a thunderstorm. You can't stand under a tree or overpass during a thunderstorm. Take Zhejiang Linhai incident as an example. From its surroundings, there are five tallest trees called Metasequoia glyptostroboides, which are very high, very high. After its thunder hit the tree, the lightning current poured down through the trunk. But in the process of pouring down, there will be a strong water flow, and it will stop when it meets resistance. Why? Because there are many people hiding from the rain under the tree. In the process of sheltering from the rain, because the height of people is above people's heads, when the lightning of this big tree falls and reaches people's heads, because the resistance of the lower trunk is relatively large, the tree is not a good conductor, so when this trunk is above people's heads, an arc flashes, hits people's heads, and then pours into the ground through the human body, so people are injured. Thunderstorm clouds are generally charged. Think of the tree as a tip discharge! Under the tree, if you hold it with a tree, then a powerful current passes through you! If you stand next to a tree, there may be a lot of current, break through the air discharge, and there will be a lot of E passing by!

Therefore, it is generally baked by lightning, and the soles of the feet are decomposed to varying degrees! So is high voltage electricity!

The first aid of lightning stroke The damage caused by lightning stroke, also called lightning stroke, has a very complicated impact on human body. Lightning is a huge arc, the current can reach 5000 ~ 200000 A, the voltage can reach millions of V, the duration of a single electric shock is only about 0.0 1s, and the repeated electric shocks are between 0.0 1s and 0.1s. Lightning is also extremely hot and explosive. Although ventricular fibrillation may occur after lightning strikes the human body, this high ampere usually stops the heartbeat and then may return to normal heartbeat rhythm. Breathing stopped for a long time, so continuous artificial respiration is the main part of resuscitation. Strong sudden muscle contraction caused by lightning can lead to fractures. The reddish tree-like or thin strip on the skin is actually a first-degree or second-degree burn, which is caused by electric current along or through the skin, and has nothing to do with the degree of deep tissue damage. Although the current intensity is high, the electric shock time is short, so there is little muscle damage, but it can also cause tissue carbonization and a lot of lacerations. The ring, watch, necklace or belt carried by the patient may cause deep burns.

If the patient is resuscitated, the abnormality of nervous system is more obvious than other soft tissue injuries. Coma can generally wake up after lightning strike, but forgetfulness and mental disorder can last. Spinal cord symptoms such as flaccid paralysis, paraplegia, sensory loss or abnormality, amnesia, mental disorder, etc. can be recovered.

The emergency treatment of lightning injury is the same as that of standard electric injury, including: ① cardiopulmonary resuscitation; ② Long-term cardiopulmonary monitoring; ③ Infusion treatment to maintain proper urine volume; ④ Observe the urine condition of myoglobin, and deal with it actively; ⑤ Determine whether the limb has symptoms of increased gap pressure, so as to determine whether decompression is needed; ⑥ Check the nervous system and monitor it; ⑦ Local nursing care of burns, including skin grafting; 8 detection, including LDH and CPK determination.

Prevention of electric shock injury caused by thunderstorm;

Recently, a thunderstorm in Zhejiang killed 15 people who were gambling under a tree. Another thunderstorm killed two brothers in Guangdong and a girl who took shelter from the rain under a tree on her way home from school ... how to protect herself in the thunderstorm? Please remember a lot of knowledge in it.

1. Don't make a phone call or answer a phone call during a thunderstorm and lightning, and turn off your cell phone. Because the electromagnetic waves of telephone lines and mobile phones will introduce lightning to hurt people.

2. Don't turn on the TV and VCD player during thunderstorm and lightning, and unplug all power plugs to avoid personal injury and damage to electrical appliances.

Don't stand under the light bulb or take a shower in thunderstorm weather.

In case of thunderstorm and lightning, try not to go out. If you have to go out, you'd better wear rubber shoes and a raincoat to insulate electricity.

5, thunderstorm days, try not to open the door and open the window to prevent lightning from hitting the room directly.

6. Don't stick your head and hands out of the window when driving, in case of lightning.

7. Don't shelter from rain and lightning under the big tree, and stay at least 5 meters away from the big tree.

8. Don't connect the wires for drying clothes and bedding to windows and doors.

9. Don't wear wet clothes, hats, shoes, etc. Walking under a thunderstorm. For sudden lightning, the height should be lowered immediately, and the feet should be close together to reduce the harm caused by the step voltage.

10, when lightning strikes, don't get close to all power facilities, such as high-voltage line transformers.

How to treat children's electric injury;

In case of electric injury, the emergency treatment steps are as follows:

1, immediately cut off the power supply. The first way to cut off the power supply is to turn off the power switch, pull the switch and pull out the bolt; The second is dry.

Dry wooden stick, bamboo pole, shoulder pole, plastic stick, belt, broom handle, chair back or rope and other non-conductive things.

Open the wire.

2. Quickly transfer the child to a ventilated place. For people whose breathing and heartbeat have stopped, give artificial respiration at the scene immediately.

Chest compression. Artificial respiration should be done for at least 4 hours, or if conditions permit, until the child regains breathing.

Tracheal intubation and artificial respiration with pressurized oxygen should be performed.

3. Coma can point Renzhong and Zhongchong points.

4, breathing, heartbeat recovery immediately sent to the hospital for treatment, but also pay close attention to the child's condition changes on the road.

5, symptomatic treatment. Brain edema caused by hypoxia can be dehydrated with mannitol and 50% glucose. Yes, due to muscle.

Fracture and dislocation caused by strong contraction of meat should be reduced and fixed; For burn patients, exposure therapy is better.