People can't live without oxygen, which can preserve health, cure diseases and cause diseases.

Oxygen poisoning refers to the damage to the function and structure of some organs caused by inhaling high concentration oxygen in a certain period of time. Whether oxygen poisoning occurs mainly depends on the treatment pressure and the time of inhaling high concentration oxygen.

Oxygen poisoning can be divided into brain type, lung type, hemolytic type and eye type.

1, brain type: it is easy to take pure oxygen for 20 ~ 40 minutes at a pressure greater than 2.5 atmospheres, but it will not happen at a pressure less than 2.3 atmospheres (the pressure of most hyperbaric oxygen treatments);

2. Lung type: pure oxygen inhalation occurs at two atmospheric pressures for 65,438+00 ~ 65,438+02 hours, and at normal pressure for 8 ~ 65,438+02 hours, and rarely occurs when the inhaled oxygen concentration is lower than 50%.

3. Eye type: Long-term hyperbaric oxygen therapy (generally 150 times or more), premature infants and very low birth weight newborns can occur.

Because the concentration of oxygen inhalation in general hospital wards is about 40%, the pressure of hyperbaric oxygen treatment is controlled at 2 ~ 2.5 atmospheres, and the continuous pure oxygen inhalation time is less than 40 minutes, so oxygen poisoning rarely occurs.

Of course, oxygen therapy, especially hyperbaric oxygen therapy (hyperbaric oxygen is a special drug) has indications, contraindications and side effects. What conditions require oxygen therapy depends on the doctor's advice. Completely healthy people in the true sense don't need oxygen.