Coughing man can automatically delete anything that interferes with his breathing, so you should not inhibit the reflex. If someone lacks oxygen, the skin gets livid or purple. It is easy to see especially after the appearance of the lips and ears.
Infant or small child who is choking, and turn blue, but not cough, you should turn upside down. A strong slate between the shoulder blades will help bring down the subject-inhibiting the flow of oxygen by inhalation.
"B" refers to the respiration (breathing). The organism must continue breathing movements, otherwise the air in the lungs will not be replaced with new ones, and again run out of oxygen. The man who is not breathing, he lives only four to six minutes.