And this downward pressure should not be too violent, otherwise it will damage Chu Nu's body, but it can't be less, then it will have no effect, generally 3-5 cm.

That is, the burly human body is pressed 5 cm, women are generally pressed 4 cm, and children are generally pressed 3 cm.

Then, Chu Nu is not a child, in terms of her physical talent, she is not too thin, but she is not as strong as a burly man, just press 4 cm.

And how to master this is completely unknown.

In fact, chest compressions, when pressing, are applied to one arm.

The reason why it is necessary to use the strength of the body to press vertically, rather than the strength of the arm, is to ensure that one hand is enough to exert the pressure required for compression, so the hand that is buckled on the pressure hand becomes the reference.

That is, the reference hand.

When the rescuer presses, the shoulder of the reference hand should not follow the force, but try to fix it, the palm of the reference hand should not follow the force, the same should follow the shoulder, try not to move, and the wrist should be relaxed relative to the fingers that are buckled, then, when you press with one of the pressure hands, the palm of the reference hand will create a gap between the back of the hand and the back of the pressure hand.

This gap is exactly about 5 centimeters.

Therefore, this gap is controlled a little smaller, that is, about 3 cm, this gap is more extended, that is, about 4 cm, this gap makes the palm of the hand straightened, then there is 5 cm.

Moreover, with this gap, it will be very safe to avoid pressing too the unconscious person.

For this reason, for the sake of this important information, the Chinese word 'hand' carries this meaning, rather than drawing a palm to represent the hand, which is the difference between civilization and simple pictograms.

The difference is very different.

Chinese characters are never simple pictographs, but morphographs.

Otherwise, the text will turn into a bunch of simple pictures of cats and dogs.

Another such as the word "pressure", not only has the meaning of hydraulic press, but also has such a meaning, under the factory outline, ten is two, press down half, is the number five, after pressing, squeeze the heart hidden in it, that is, that, .

Zhang Jingtao followed this method and pressed down.

When the body is straightened and relaxed, the pressure hand is replied, and the palm of the reference hand is pressed again.

In this way, the restriction caused by the straight arm of the reference hand stuck the recovery height, which not only ensured that the hand would not be delayed for too long after relaxing, but also ensured that Chu Nu's chest had enough space to naturally recover and stretch.

When the heart is compressed, it can also rebound enough to allow venous blood to flow in.

After Zhang Jingtao pressed it, of course, he had to consider how many times to press.

And the number of cardiopulmonary resuscitations is even more controversial.

Fortunately, as the successor of Chinese civilization, Zhang Jingtao is also very clear about this, so what he wants to do is different from all the statements.

It's the 110 law.

This is related to some principles of cardiopulmonary resuscitation.

Cardiopulmonary resuscitation, let go of the interval between pressing the heart to do artificial respiration, is not too long, this limit, to be able to strong living people when sleeping quietly, the slow heart beat is 60 beats, the high-speed beat is 180 beats, but it can be completely nothing to use as a benchmark.

In this way, the heart's tolerance for beating is roughly three times the base.

So, down the line, it's about 3 times.

In other words, when the physiological functions of the human body are running very slowly, the heart rate of 20 beats can still maintain the physiological functions of the human body at the lowest speed, and the heart itself can still maintain vitality.

Then, from this point of view, at 60 beats, it takes 1 second for each beat of the heart, and when it beats 20 times, it beats once every 3 seconds, and the pulse floats to the limit, and if it grows, it will break the beat, so the range of slowing that the heart can tolerate is roughly 3 seconds.

Presumably some people have a little understanding of the pulse of Chinese medicine.

Therefore, if you want to match the rhythm of the heart itself, it is best to stop compressions for no more than 3 seconds, which is most conducive to resuscitation.

For this reason, the word 'heart' not only means the heart, the ostium of the main blood vessels, and the reflux of venous blood, but also carries the meaning of these three hidden points.

Of course, this pressure is best kept constantly.

But in the case of only one person rescue, of course, this is not possible, so if you want to interrupt, it is best to control it within 2 seconds.

This means that the time you can perform artificial respiration is only 2 seconds!

If the rescuer's movement is too slow, with a delay of 3 seconds, then the success rate of rescuing the fake dead will be greatly reduced.

Chu Nu, her body is very good, just pressing it like this, Zhang Jingtao can feel the extremely powerful temptation coming from his hand, but after he has the experience of the Warring States Period, he can completely control his mind, and when his palm should leave, he will never stay for a little longer.

The rhythm of blowing is best to reach ten times a minute, because when normal people do slight movements, it is almost ten breaths, so the word exhalation carries the meaning of ten breaths.

Therefore, if two people are rescued, one of whom specializes in artificial respiration, it can naturally be done once every 6 seconds, so that the unconscious person can be kept breathing 10 times a minute.

But when a person rescues, there is no such condition.

Then we can only seek the second, this second, that is, when people are not moving, sit quietly and relax, breathe slowly, and usually only need to breathe 7 times a minute to maintain normal physiological functions without feeling stuffy.

For this reason, the word qi comes from this, taking the 'seven' sound.

Although the physiological function of the drowning person is slower and the demand for amniotic gas is smaller, the drowning person is already lacking in the body of the amniotic gas, and the breathing is dependent on others to blow the air, and the absorption of the amniotic gas is not enough, so it is best to blow the drowning person 8 times.

Therefore, the blowing word of blowing air is also born from this, mouth, owing, and people, only for blowing, that is, people are unconscious, lack of breathing, they need to blow, and in addition to their own meaning, the word also implies the meaning of eight.

In artificial respiration, it will weigh eight but not ten, because after all, eight mouths is the basic guarantee.

So, knowing the time of artificial respiration, how many chest compressions, that is, heart compressions, should be required?

To figure this out, of course, it is necessary to know the functioning state and function of the human heart.

The human heart, with the exception of athletes, usually has a heartbeat of around 70 beats.

The main function of the heart and blood vessels is to allow all parts of the body to get enough sheep qi and nutrients, balance the body's heat, and take away the waste products produced by the body.

It's just chest compressions, and the most important thing to consider is, of course, the problem of amniotic gas.

Then, under artificial respiration, when the degree of amniotic qi that can be absorbed by the blood is not enough, 70 beats will be a bit insufficient, therefore, in order to increase the amount of amniotic qi in the blood, it is best to keep the heartbeat of the comatose person at about 80 beats.

Then, you need to press about 80 times a minute.