Artificial breathe

It consists in supplying air to the affected person, who does not breathe spontaneously. It is usually performed as part of resuscitation care. 

Professional medical care uses breathing apparatus, air is blown into the patient's lungs through tubes inserted into the trachea or through a mask. 

Lay first aid involves mouth-to-mouth breathing. In many cases, the spontaneous breathing of the unconscious can be restored simply by tilting his head and advancing his lower jaw. If breathing is not restored after clearing the airways, we begin an indirect cardiac massage and mouth-to-mouth artificial respiration at a rate of 30 compressions and 2 breaths. Mouth-to-mouth breathing is not recommended in lay first aid if: 

• we cannot perform artificial respiration - it may rather harm 
• the patient we can't do it - there is an obstruction in the airways (eg after suffocation by a foreign body) 
• our safety is at stake - we don't know the person, we are afraid of transmitting a contagious disease

If we meet any of the above points, we continue only to compress the chest, at a frequency of 100-120 compressions per minute. 

In the case of mouth-to-mouth breathing, the exhaled air contains a sufficient amount of oxygen (16% compared to 21% in the atmosphere). Thus, the exhaled air ensures a sufficient supply of oxygen to the tissues, provided that the heart or heart massage works.