In the early to mid 20th century oxygen therapy became rational and scientific, and today modern medicine could not be practiced without the support that oxygen supplies .

Medical oxygen is sued to :
Provide a basic for virtually all modern anesthetic techniques .
Restore tissue oxygen tension by improving oxygen availability in a wide range of conditions such as COPD , Cyanosis , shock , Servere hemorrhage, carbon monoxide poisoning , major trauma , Cardiac / respiratory arrest .
Aid resuscitation .
Provide life support for artificially ventilated patients .
Reduce incidence of surgical wound infection .
Aid cardiovascular stability .