It doesn't fall. It only seems to be. It's all about Korotkov's tones. This is the name of the knocks that we hear when measuring blood pressure with a mechanical tonometer.
There you can hear 5 types of knocks. If knocks were heard, and then they stopped, then this means that we have reached the lower pressure. So we will write it down on a piece of paper.
But not every person stops knocking. They listen to them, but they keep knocking and knocking. The tonometer cuff is deflated on the shoulder, and the knocking continues. The pressure gauge is already zero, but the knocks remain. You might think that the pressure has dropped to zero.
It is clear that without blood pressure, a person will not look at you, but will lie on the floor. So this is a mistake.
Children
We find this more often in children. There are various explanations for this miracle. Most likely it is associated with blood swirls. That is, with turbulence.
By pressing the phonendoscope membrane on the artery, the lumen of the artery is compressed, and the blood curls. The speed in such eddies is higher, and therefore knocks can persist for a long time.
Or so: we inflate the tonometer cuff, compress the artery, then deflate the cuff, but the artery still remains slightly compressed by the phonendoscope itself. That is why the tones are heard.
How to live on
Live exactly the same as before. Because these are only sounds. They won't hurt you. Problems can arise only if someone is suspected of high blood pressure.
Such people need to be sure that their upper pressure is below 140 millimeters of mercury, and the lower pressure is below 90 millimeters of mercury.
The diagnosis of arterial hypertension will be made equally quickly for both lower and upper pressure. And you and I do not need extra diagnoses. Truth?
So an endless tone knocks at such people, and they are happy. Like their pressure is low. But this is an illusion. Therefore, it is considered bad form to write somewhere in the documents about blood pressure that it is 140/0 millimeters of mercury.
Fourth tone
Instead of zero, they write the pressure at which Korotkov's fourth tone is heard. And right in the piece of paper about the fourth tone and write.
Korotkov's tones knock, hiss, thunder, weaken and then disappear. So you don't have to wait until the knocking disappears, but you need to write down the pressure at which the knocks abruptly weakened. This is the very fourth tone of Korotkov.
Once upon a time, when doctors ran into the phenomenon of endless tone, they even wanted to limit themselves to the fourth tone. In order not to be mistaken. But then it turned out that the fifth tone is nevertheless closer to the real figures of blood pressure, and the fourth tone overestimates the pressure by about 10 millimeters of mercury.
It turns out that such a person with an endless tone can be unfairly recorded in hypertensive patients. And this is already a stigma for the rest of your life.
Well, that's how we live between two extremes.
Did you have zero pressure?
