Under normal circumstances, there are two situations:
1. Health-care oxygen inhalation: the oxygen flow rate is controlled between 1.5 and 3 liters/minute, and the actual oxygen inhalation concentration is controlled at 24~33, each oxygen inhalation time is about 1 hour (recommended not less than 20 minutes). At the same time, the flow rate is 1 liter/minute, which is suitable for all people except infants and young children.
2. Medical oxygen inhalation: For example, patients with COPD and other patients are undergoing oxygen therapy. In order to achieve better oxygen therapy effect, the oxygen flow rate should be controlled at 3~5 liters/minute, and the actual oxygen inhalation concentration should be From 32 to 41, breathe oxygen for at least 15 hours a day. If you breathe oxygen 24 hours a day, the effect will be better.
Its characteristic is that oxygen inhalation directly increases the oxygen content of arterial blood, rather than acting on a certain part of the body to indirectly improve hypoxia. It only increases the oxygen that the body has continuously absorbed throughout its life. There are no substances that are unfamiliar to the body, need to be adapted, or need to be analyzed, so it only improves rather than changes the natural physiological state and biochemical environment of the body.
In nursing science, it is pointed out that the oxygen content in the air is 21. When we inhale an oxygen concentration lower than 25, it is similar to the oxygen content in the air and has no therapeutic value. A concentration higher than 70 lasts for more than 1-2 days, oxygen poisoning occurs. Therefore, patients with heart and lung diseases need to use an oxygen concentrator with a flow rate of 3 liters or above.
Reference: Baidu Encyclopedia-Oxygen Concentrator