Since 1971, (for 14 years) we have run the oxygen therapy unit in the Department of Anesthesiology. During this time, unauthorized personnel have carried out the duties in the unit under the supervision of anesthesiologist. We came to realize the necessity of having educated personnel to do the work in the oxygen therapy unit. 1) Our data on oxygen therapy increases yearly because the use of respiratory care is gradually increasing. 2) The postoperative use of a respirator increases due to the increase of critical surgical patients such as those who have had open heart and cerebral aneurysm surgery. 3) Hyperbaric oxygen treatment has decreased yearly. 4) Oxygen therapy was most frequently used in patients in the first 10 years of life. 5) The cases which had oxygen treatment were: pneumonia, atelectsis, pulmonary edema, CVA, head trauma, Gullian-Barre syndrome, sepsis, asthma and tetanus in that order. 6) Seasonally, the cases were more frequent in the spiring and fall.