"In the course of the longstanding research in cancer therapy Oxygen Multistep Therapy developed through the unexpected discovery of a switching mechanism of the microcirculation in the whole organism.
This switching mechanism is interpreted as a re-enlargement of the capillary narrowed by oxygen deficiency (old age, disease, distress). The re-enlargement appears after increased oxygen uptake of the blood and improved oxygen utilisation of human tissue over a certain time period. Despite the Oxygen Multistep Therapy is not time-consuming it provides a measurable and long lasting increase of the energy status of untrained people or people stressed by the factors mentioned above.

The remarkable therapeutic effects through this energy increase led to the opening of about 600 centres in the German-speaking area. Since that time more than 100,000 patients were helped by increasing their energy status with this new Oxygen Multistep Therapy." More

This is knowledge based on the results of fundamental research: on the cellular level the process of ageing corresponds to degeneration, and consequently resembles a disease. The common feature of all diseases is however an increase in the formation of free radicals, accompanied by a decline in the cells' ability to utilize oxygen.
Free radicals, also termed simply radicals, are molecules arising during the generation of energy in the cell. Their quantities are increased by illnesses or functional breakdowns, which enable them to extract larger quantities of the electrons they lack from the electron pairs of other molecules. As a result chain reactions harmful to the cells commence, and just one free radical can attack thousands of molecules. This molecular damage caused to the cell by radicals is nowadays viewed as the basic principle behind illness and ageing. Just a minor defect reduces the cells' ability to process the oxygen, the radicals multiply in the cells, which become diseased and lose their part of their capacity to exploit the oxygen. This leads to a loss of energy, and makes any recovery impossible. More

Definition

Oxygen therapy is the administration of oxygen as a therapeutic modality. Oxygen therapy benefits the patient by increasing the supply of oxygen to the lungs and thereby increasing the availability of oxygen to the body tissues. Appropriate levels of oxygen are vital to support cell respiration. High blood and tissue levels of oxygen can be helpful or damaging, depending on circumstances.

Oxygen is in the air we breathe and is necessary to live. When we breathe in, oxygen enters the lungs and it goes into the blood. When the lungs cannot transfer enough oxygen into the blood, an oxygen therapy program may be necessary. The major reason why oxygen therapy is used is to assure that there is enough oxygen in the blood to provide for the body's needs.
There are many diseases where oxygen therapy may be useful. Many infants, children and adults have benefited from the use of oxygen therapy for acute healthcare needs and chronic lung conditions. Oxygen therapy is used to normalize the oxygen level in blood during sleep, rest, activity and during acute illnesses in the hospital.

There are many benefits of oxygen therapy.  Oxygen therapy can assist with the growth and development in children with chronic lung conditions.  In adults with chronic lung disease, studies have shown that long-term oxygen therapy has improved quality and length of life.  Oxygen can decrease shortness of breath when you are active and allow you to do more. 

There are three systems that can supply oxygen: concentrators, compressed gas systems and liquid systems. 
Each system has advantages and disadvantages.  It is important to choose the system which best fits your lifestyle.
Concentrators are commonly used because they are convenient for both the patient and the oxygen supply company.  Concentrators plug into an electrical outlet and take oxygen from the room air.  These systems can add to the monthly cost of electricity, may be noisy and may produce additional heat. If you live in a rural area or have frequent power outages, you may need a back-up system.  If you are active, you may need an additional system to use when you go outside your home.
Compressed gas systems are readily available across the country.  Steel or aluminum cylinder tanks, which contain oxygen gas, are available in several sizes.  The smaller sizes are portable; however, this system may be a bit more bulky than other portable systems.
Liquid systems have two parts - a large stationary container and a portable unit with a small lightweight tank.  You can refill your portable unit from the stationary unit.  The oxygen supply company will visit periodically to refill the stationary unit.
If your needs change, the type of system can also be changed.  The oxygen supply company should explain and demonstrate whichever system you choose.

Oxygen first aid specifically refers to the use of oxygen in a first aid setting. Oxygen will assist patients with myocardial infarction and hypoxia (low blood oxygen levels). Care needs to be exercised in patients with chronic obstructive pulmonary disease, especially in those known to retain carbon dioxide (type II respiratory failure) that lose their respiratory drive and accumulate carbon dioxide if administered oxygen in moderate concentration. For this reason, some jurisdictions require medical approval for all emergency oxygen administration.