Good afternoon. Tubes are needed to supply oxygen, in feature films they are put to everyone to enhance the emotional effect on the person watching the film.
All the answers are not quite the essence of the question. The question is why these tubes are put to everyone. And their purpose is already obvious - the supply of oxygen to facilitate breathing.
The fact that they are put to everyone in films is just a cinematic cliché and does not mean at all that in reality they are stuck to everyone. They are needed only in a serious condition with difficulty in natural breathing. The stamp is intended to show that the patient's condition is serious, like without tubules, he can not survive.
I want to note that our methods of examining a patient are very different from the American one. They do an almost complete analysis and diagnosis, even if it is not required. Roughly speaking, your arm is broken, but all the same, your throat will be checked and blood will be taken, for example. As the American woman told me, a lot of unnecessary things will need to go through in order to achieve the desired result. Therefore, I assume that sometimes the patient lies with such tubules because of "overprotection". Well, do not forget that all such numerous manipulations with the patient raises the price tag for medical care.
I will add that the same practice with oxygen catheters is used in hospitals in Ukraine (and in Russia, I think, too), in recovery wards or intensive care units.
Specifically, the picture (two tubes / two-way cannula) shows a nasal oxygen catheter through which humidified oxygen is supplied to facilitate the patient's breathing (so that the body does not waste energy on breathing, sends them for treatment, and so on - and this, in essence, will not interfere with any patient).
There are also (one tube) gastronasal catheters through which apexmed.ru is fed through the nose, but this is in other, special cases.